JPH09102034A - Method for automatically generating road network information and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain finally precise, minute and complete road network information from the road edge graphic of a large-scale map. SOLUTION: A center line, namely, precise road network information is obtained on road edge information in the large-scale map based on teaching road network information (first constitution). The center line, namely, a minute road network is obtained on a minute road edge segment where a road surface side is not recognized based on a road edge segment where a road surface is recognized (second constitution). Road network information obtained by second constitution is interpolated and complete road network information is obtained (third constitution).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for automatically generating road network information, and in particular, uses road network information of a small-scale map as given information (hereinafter referred to as teaching information). By
The present invention relates to a method and an apparatus for automatically generating road network information that can finally obtain accurate, detailed, and complete road network information from a road edge graphic on a large-scale map.

[0002]

2. Description of the Related Art A map having a scale of 1/500 to 1/10000 (hereinafter referred to as a large scale map: a map having a relatively small N when the scale is expressed by 1 / N) is a detailed map.
The road is represented by two lines that represent the block line (hereinafter,
When the map information is used on a computer, when it is drawn on a display, it is possible for a human to recognize the area between the two roads as a road.

FIG. 36 shows an example in which only road data of a large scale map with a scale of 1/2500 is drawn. As shown in the figure, the large-scale map is rich in information on the detailed shape of roads and buildings near intersections and is easy to understand.

However, in order to highly utilize such abundant information on a computer, it is important that the road connection relationship is represented by a graph structure, that is, networked. On the contrary, if the road network information can be constructed for the large scale map, the detailed road network map will be detailed and accurate, and the amount of information such as the target will be large, and the utility value will be very high. When attempting to manually network roads on a large-scale map, the map is so detailed that it requires a huge number of man-hours.

On the other hand, reduced scale 1/25000 to 1/5000
0 map (hereinafter referred to as small scale map: 1 / N scale)
The map of large N) is a road network map used in car navigation and the like. FIG. 37 shows an example of the road network map. From the map shown in the figure, a guide map showing directions and routes can be created. As additional information of the road network,
Road names, speed limits, one-way roads, toll roads, motorways, national roads, prefectural roads, city roads, private roads, and other road attributes are entered.

[0006] However, the road network information in such a small scale map originally has a scale of 1/25000.
Since a paper map of ~ 1/50000 is input as the original map, the accuracy is not so good and the exact road width etc. cannot be known. In addition, there are few target objects such as buildings. For this reason, detailed shapes and information such as the vicinity of intersections, grade separations, intrusion roads, etc., which are most likely to be misused by humans, are not faithfully represented.

In a differential GPS (Global Positioning System) or the like, when the position is measured or corrected on the road network information, the scale is 1/250.
Since the accuracy of the road network information on the small scale map of 00 is insufficient, a map having more precise road network information is desired.

However, since it is originally input based on a small-scale map (for example, a map of 1/25000 scale), information such as road width cannot be read, and a high-precision road network with more detailed road widths is given. It is difficult to create a large scale map with information.

Further, even if, for example, a small-scale map is simply overlaid on a large-scale map by coordinate conversion, the following method is employed, so that a map with a large deviation can be created. Can not. In other words, the small scale map is different from the actual position shape (referred to as the true shape) because the shape of the small scale map is deformed and input by a human in order to emphasize the visibility. For example, if two roads run side by side, the two roads will match and look like one when expressed in a true form, so a method is used to shift them from the actual position so that they look like two roads. doing.

FIG. 38 shows an example of conversion of the small scale map shown in FIG. 37 and the large scale map shown in FIG. 36 into the same coordinates. As shown in FIG. Then, it can be seen that there is a portion where the road network information p and the road edge segment q deviate greatly as shown in the area s.

When constructing a road network in a large scale map database, digitizing road network information, that is, inputting a center line and a road width of a road is the most costly. The following methods have been disclosed as conventional techniques for automatically obtaining the center line and road width of a road.

Cover the road edge with Delaunay's triangular mesh,
There is Delaunay's triangulation method to network from there. This method is used for a map with a scale of 1/10000 of an information structure in which road figures are closed figures. For details, refer to the document “GIS-Theory and Applicati”.
on of GIS), 1994, Vol 2, No. 1, pp.33-40 ”.

There is a closed loop road recognition method in which a road figure is closed looped and a road surface is recognized to obtain a network.
In this method, all road segments are closed loop. For details, see "Tobe, Kamihara, Kawabe," Examination of Road Width Making Method ", 70th Anniversary General Conference of The Institute of Electronics, Information and Communication Engineers (1987)".

There is a parallel line method that focuses on the parallelism of road edges. This method is described in "Horie, Tanaka, Babaguchi, Tan, Kitabashi," Generation of Road Network from Vector Map ", IEICE Spring Conference, 1994, D-466".

[0015]

However, in general, the road edge graphic of a large scale map has the following problems. A road figure is simply a line segment sequence that represents a block line: 1. There is no connection relation / regularity / road side / building side attribute in the road segment: 3. Mixing thick and thin roads: 4. Road figures are not closed due to division at entrances / railways, etc. There are many complicated shapes such as median strips, grade separations, and parallel roads: 6. The shape near the intersection is complicated and diverse: Therefore, it is difficult to extract the center line and the road width by each of the above methods. Each of the above-mentioned conventional methods has the following problems, and it is the actual situation that they have not reached a practical level.

The Delaunay triangulation method can be applied only to a map with a scale of 1/10000 with a special information structure in which road figures are closed figures.

In the closed loop road recognition method, enormous cost is required to make all road line segments into a closed loop.

In the parallel line method, there is a large problem that a block narrower than a road is erroneously extracted as a road, and extraction of the center line and the road width is very bad.

Therefore, in the past, generally, only a method of manually inputting using a digitizer can be adopted when defining the center line and the road width for the road edge graphic of the large scale map. In this case, it takes a human cost to determine the center line and the road width of the road, and since the map becomes a large-scale map and the number of input points increases dramatically, the manual input cost is too high. There is a problem that it is extremely difficult to realize.

On the other hand, as described above, the small scale map is different from the true shape in that the human is deforming and inputting the shape with emphasis on the legibility. Therefore, even if the small-scale map is coordinate-converted into the large-scale map and superposed, the deviations do not greatly match. Therefore, it is difficult to superimpose and display maps with different scales.

The present invention has been made from the background as described above, and an object of the present invention is to finally obtain accurate, detailed and complete road network information from road edge graphics of a large scale map. An object of the present invention is to provide an automatic generation method of road network information and an apparatus thereof.

Another object of the present invention is to provide accurate, detailed,
Another object of the present invention is to provide an automatic road network information generation method and apparatus capable of constructing a map database having extremely high utility value including complete road network information.

Another object of the present invention is to obtain accurate road network information by extracting the center line corresponding to the road edge information of the large scale map using the road network information of the small scale map as teaching information. An object of the present invention is to provide a method and apparatus for automatically generating road network information that can be acquired.

Another object of the present invention is to obtain detailed road network information by extracting a center line at high speed and accurately even in a narrow road in road edge information of a large scale map. An object is to provide an automatic generation method of network information and its apparatus.

Another object of the present invention is to associate the teaching information with the correct road network information corresponding to the teaching information so that the attribute data of the teaching information can be directly taken over to the accurate road network information. An object of the present invention is to provide a method and an apparatus for automatically generating information.

[0026]

In a method for automatically generating road network information according to a first aspect of the present invention, a center line is extracted from road edge information of a large scale by using road network information of a small scale as teaching information. One step, a second step of extracting a center line for road edge information for which no center line has been extracted based on the road edge information for which a center line has been extracted, and the center line obtained up to the second step And a third step.

This method provides accurate, detailed and complete road network information.

In the automatic generation method of road network information according to claim 2, in the automatic generation method of road network information according to claim 1, the first step includes:
An eleventh step of converting the small-scale road network information and the large-scale road edge information into the same coordinates, and selecting one road line segment from the small-scale road network information to select the road line segment. The thirteenth step of performing the process of extracting the center line in the corresponding large-scale road edge information for all road line segments, and inheriting the information added to the road network information as the information added to the center line A fourteenth step of:

In the automatic generation method of road network information according to claim 3, in the automatic generation method of road network information according to claim 2, after the eleventh step, the small scale road network information is generated. And a twelfth step of storing a management number and attribute information for each of all the line segments forming the road edge information of large scale.

With this method, the road network information on the large-scale map finally obtained can be made to inherit the attribute information relating to the road network information on the initial small-scale map and the road edge information on the large-scale map.

In the automatic generation method of road network information according to claim 4, in the automatic generation method of road network information according to claim 2, in each of the thirteenth step and the fourteenth step. Each time a line segment to be processed is processed, its management number is stored and its attribute information is obtained and stored.

In the method for automatically generating road network information according to claim 5, in the method for automatically generating road network information according to claim 2, the thirteenth step is for the selected road line segment. , All road edge lines within a predetermined distance from the selected road line segment among the road edge line segments of the road edge information and having a predetermined parallelism or more with the selected road line segment Thirteenth
For each road edge line segment obtained in the 1st step and its 131st step, the intersections of the horizontal or vertical scanning lines and the road edge line segments are obtained, and the intersections between the obtained intersections are calculated. The 132nd step in which the points are road center point candidates, the 133rd step in which the road center point candidates obtained in the 132nd step are connected to generate a centerline candidate, and the centerline obtained in the 133rd step The 134th candidate from which the length, distance, and road width are closest to the selected road line segment is selected, and the selected centerline candidate is determined as the centerline for the selected road line segment. And a process.

In the automatic generation method of road network information according to claim 6, in the automatic generation method of road network information according to claim 5, in the step 132, each road center point candidate is The management numbers and attribute information of the two referenced road edge lines, the road widths associated with those road edge lines, and the road line segment management numbers of the corresponding road network information are added. Characterize.

In the automatic generation method of road network information according to claim 7, in the automatic generation method of road network information according to claim 5, for each road center point candidate in the 133rd step. , Numbering is performed in the order of the arrangement of the scanning lines, and consecutive road numbering is performed for road center point candidates on the same scanning line, and the road edge line segments on both sides used when obtaining the road center point candidates are the same. That the distance between the road center point candidates is within a predetermined distance, the road width does not change more than a predetermined value times between adjacent road center point candidates, and the angle at which the center line bends is a predetermined value or less. The condition is that the center point candidates are created by connecting the road center point candidates.

In the automatic generation method of road network information according to an eighth aspect, in the automatic generation method of the road network information according to the fifth aspect, in the 134th step, one of the centerline candidates is long. Is close to the length of the road line segment, the distance to the road line segment is short, and the road width is close to the road width of the road line segment is selected as one center line.

In the automatic generation method of road network information according to claim 9, in the automatic generation method of road network information according to claim 1, the second step includes
For the road edge information from which the center line is extracted, the road surface side is recognized based on the information of the center line.
22nd step of certifying the road surface side based on the road edge information of which the road surface side has been certified in the 21st step, and the road edge information of which the road surface has not been certified;
From the road edge information newly approved for the road surface side in the process, the 23rd process for recognizing the pair of road edge line segments forming the road surface and the pair of road edge line segments approved in the 23rd process 24th step of obtaining the center line based on the above.

In the automatic generation method of road network information according to claim 10, in the automatic generation method of road network information according to claim 9, all road edge information is accumulated in the 21st step. The road edge information from which the center line is extracted by inputting the road edge information and the center line information from the road edge information storage means and the center line information storage means in which the center line information is stored, respectively, and correlating them. It is characterized by leading.

In the automatic generation method of road network information according to claim 11, in the automatic generation method of road network information according to claim 9, the 22nd step is a road whose road surface is not certified. A step 221 of extracting edge information, and a step 222 of certifying the road surface side for road edge information for which the extracted road surface is not certified,
It is characterized by having.

According to an automatic generation method of road network information described in claim 12, in the automatic generation method of road network information according to claim 11,
The process is characterized in that road edge information for which the road surface adjacent to the road edge information for which the road surface is certified is not certified is extracted.

In the automatic generation method of road network information according to claim 13, in the automatic generation method of road network information according to claim 11, said 221
It is characterized in that in the process, road edge information in which road surfaces continuous with the road edge information in which the road surface is certified is not certified is extracted.

The automatic generation method of road network information according to claim 14 is the same as the automatic generation method of road network information according to claim 11,
In the process, when certifying the road surface side for road edge information for which the road surface is not certified, the road edge for which the road surface is not certified is the same as the road edge information for which the road surface is certified. It is characterized in that the connection direction of information is determined.

In the automatic generation method of road network information according to claim 15, in the automatic generation method of road network information according to claim 9, in the 24th step, a newly created center It is characterized in that the information on the entire center line is configured by adding the information on the line to the information on the already created center line.

In the automatic generation method of road network information according to the sixteenth aspect, in the automatic generation method of the road network information according to the ninth aspect, in the twenty-fourth step, the certification is made in the twenty-third step. It is characterized in that the center line is obtained by connecting the midpoints of the end points of both ends of the overlapping portion of the pair of road edge lines.

In the automatic generation method of road network information according to claim 17, in the automatic generation method of road network information according to claim 1, the third step is obtained up to the second step. A 31st step of determining a dead end of the end point of the center line, a 32nd step of connecting the end points of the two centerlines with a line segment, a 33rd step of obtaining an intersection point of the intersecting centerlines, and a centerline 34th step of connecting a center line intersecting the extension line of the center line with the extended center line, 35th step of connecting the center lines at the intersections of the extension lines of the two center lines, and all the center lines 36th step of obtaining an end point node for line information.

In the road network information automatic generation apparatus according to the eighteenth aspect, there is provided an accurate centerline information generation means for extracting a centerline for road edge information of large scale using the road network information of small scale as teaching information. ,
Based on the road edge information from which the center line has been extracted, the detailed center line information generating means for extracting the center line for the road edge information for which the center line has not been extracted, and the center line obtained by the detailed center line information generating means Complete centerline information generating means for interpolating.

In the road network information automatic generation apparatus according to claim 19, in the road network information automatic generation apparatus according to claim 18, the accurate center line information generation means is the small scale road. Coordinate conversion means for converting the network information and the road edge information of the large scale into the same coordinates, and one road line segment is selected from the road network information of the small scale, and the large scale corresponding to the road line segment is selected. Corresponding center line extraction means for performing the process of extracting the center line in the road edge information of all the road line segments, and additional information for inheriting the information added to the road network information as the information added to the center line. And inheriting means.

According to a twentieth aspect of the automatic generation apparatus for road network information of the nineteenth aspect, in the automatic generation apparatus for road network information according to the nineteenth aspect, the road network information of the small scale and the road edge of the large scale. It is characterized by having a storage means for storing the management number and the attribute information for each of all the line segments forming the information.

According to a twenty-first aspect of the automatic road network information generating apparatus of the nineteenth aspect, each of the corresponding center line extracting means and the additional information generating means is provided. In this means, each time the line segment to be processed is processed, its management number is stored and its attribute information is obtained and stored.

In the automatic road network information generating device according to claim 22, in the automatic road network information generating device according to claim 19, the corresponding center line extracting means is provided with the selected road line. For a minute, a road edge line segment that is within a predetermined distance from the selected road line segment among the road edge line segments of the road edge information and that has a parallel degree or more with the selected road line segment is specified. For all the line segment calculating means to be obtained and all the road edge line segments obtained by the line segment calculating means, the intersections of the scanning lines in the horizontal or vertical direction and the road edge line segments are obtained, and the obtained plurality of intersection points are obtained. A center point candidate acquisition unit that uses each middle point between them as a road center point candidate and a center line candidate that connects the road center point candidates obtained by the center point candidate acquisition unit to generate a center line candidate A candidate for which the length, distance and road width are closest to the selected road line segment is selected from the center line candidate obtaining means and the center line candidate obtained by the center line candidate obtaining means, and the selected center line is selected. Center line determining means for determining a line candidate as a center line for the selected road line segment.

In the road network information automatic generation apparatus according to the twenty-third aspect, in the road network information automatic generation apparatus according to the twenty-second aspect, in the center point candidate acquisition means, each road center point candidate is selected. Is added with the management numbers and attribute information of the two referenced road edge segments, the road widths associated with those road edge segments, and the road segment management numbers of the corresponding road network information. It is characterized by

In the automatic road network information generating apparatus according to the twenty-fourth aspect, in the automatic road network information generating apparatus according to the twenty-second aspect, the centerline candidate acquisition means assigns to each road center point candidate. On the other hand, numbering is performed in the order of the arrangement of the scanning lines, and consecutive road numbering is performed for the road center point candidates on the same scanning line, and the road edge line segments on both sides used when obtaining the road center point candidates are the same. , The distance between the road center point candidates is within a predetermined distance, the road width does not change more than a predetermined value times between the adjacent road center point candidates, and the angle at which the center line bends is a predetermined value or less. To be
Under the condition, the road center point candidates are connected to create a center line candidate.

In the road network information automatic generation apparatus according to the twenty-fifth aspect, in the road network information automatic generation apparatus according to the twenty-second aspect, the center line determining means is one of the center line candidates. It is characterized in that one having a length close to the length of the road line segment, a short distance to the road line segment, and a road width close to the road width of the road line segment is selected as one center line.

In the automatic road network information generating apparatus according to the twenty-sixth aspect, in the automatic road network information generating apparatus according to the eighteenth aspect, the detailed centerline information generating means extracts a centerline. For road edge information, the road surface authorization processing means for authorizing the road surface side based on the information of the center line and the road edge information for which the road surface has not been authorized are certified for the road surface side by the road surface authorization processing means. The road surface side from the uncertified road edge information road surface certification means that certifies the road surface side based on the road edge information and the road edge information that the road surface side is newly certified by the uncertified road edge information road surface certification means. Based on the road edge line segment recognition processing means for recognizing the pair of road edge line segments forming the surface, and the pair of road edge line segments certified by the road edge line segment recognition processing means. And having a center line extracting means for obtaining the center line, the Te.

According to a twenty-seventh aspect of the automatic road network information generating apparatus of the twenty-sixth aspect, in the road network information automatic generating apparatus, all the road edge information is included in the road surface recognition processing means. The road edge from which the center line has been extracted by inputting the road edge information and the information of the center line from the accumulated road edge information storage means and the center line information storage means in which the center line information has been stored, respectively, and making them correspond to each other. Characterized by guiding information.

According to a twenty-eighth aspect of the automatic network information generating apparatus of the twenty-sixth aspect, in the automatic twenty-fourth aspect of the network information, the unrecognized road edge information road surface recognizing means is a road surface. Has unapproved road edge information extraction means for extracting road edge information that is not certified, and road surface authorization means for authorizing the road surface side for road edge information for which the extracted road surface is not certified. Characterize.

In the automatic generation apparatus for road network information according to claim 29, in the automatic generation apparatus for road network information according to claim 28, the uncertified road edge information extraction means is a road surface certified. It is characterized by extracting road edge information in which a road surface adjacent to the generated road edge information is not certified.

According to a thirtieth aspect of the present invention, in the automatic road network information generation apparatus of the twenty-eighth aspect, the road surface is certified by the uncertified road edge information extraction means. It is characterized by extracting road edge information in which a continuous road surface in the vicinity of the generated road edge information is not certified.

According to the thirty-first aspect of the automatic road network information generating apparatus of the twenty-eighth aspect, the road surface certifying means does not certify the road surface. When certifying the road surface side for road edge information, the connection direction of road edge information for which the road surface is not certified so that the road surface is the same as the road edge information for which the road surface is certified is characterized. To do.

According to a thirty-second aspect of the automatic road network information generating apparatus of the twenty-sixth aspect, the center line extracting means is newly created. It is characterized in that the information of the center line is added to the information of the already created center line to configure the information of the whole center line.

According to a thirty-third aspect of the automatic road network information generating apparatus of the twenty-sixth aspect, the center line extracting means recognizes the road edge line segment. It is characterized in that the center line is obtained by connecting the midpoints of the end points of both ends of the overlapping portion of the road edge line pairs of the pair certified by the processing means.

In the automatic road network information generating device according to the thirty-fourth aspect, in the automatic road network information generating device according to the eighteenth aspect, the complete centerline information generating means generates the detailed centerline information. Means for determining the dead end of the end point of the center line obtained by the means, means for connecting the end points of the two center lines with a line segment, means for obtaining the intersection point of the intersecting center lines, and Information on all the center lines, means for connecting a center line intersecting the extension line with the extended center line, means for connecting the center lines at the intersections of the extension lines of the two center lines, and information on all the center lines And a means for obtaining an end point node, and.

In a method for automatically generating road network information according to a thirty-fifth aspect, a first scale for converting small-scale road network information and large-scale road edge information into the same coordinates.
One step and a process of selecting a road line segment one by one from the small scale road network information and extracting a center line in the large scale road edge information corresponding to the road line segment for all road line segments It is characterized by including a thirteenth step to be performed and a fourteenth step of inheriting the information added to the road network information as the information added to the center line.

According to this method, it is possible to obtain an accurate center line for large-scale road edge information by using small-scale road network information as teaching information.

According to a thirty-sixth aspect of the present invention, in the automatic generation method of road network information according to the thirty-fifth aspect, after the eleventh step, the small-scale road network information is generated. And a twelfth step of storing a management number and attribute information for each of all the line segments forming the road edge information of large scale.

In the method for automatically generating road network information according to claim 37, in the method for automatically generating road network information according to claim 35, in each of the thirteenth step and the fourteenth step. Each time a line segment to be processed is processed, its management number is stored and its attribute information is obtained and stored.

In the method for automatically generating road network information according to claim 38, in the method for automatically generating road network information according to claim 35, the thirteenth step is for the selected road line segment. , All road edge lines within a predetermined distance from the selected road line segment among the road edge line segments of the road edge information and having a predetermined parallelism or more with the selected road line segment First
For each road edge line segment obtained in the 31st step and the 131st step, intersections between the scanning lines in the horizontal or vertical direction and the road edge line segments are obtained, and in each of the obtained intersections. The 132nd step in which the points are road center point candidates, the 133rd step in which the road center point candidates obtained in the 132nd step are connected to generate a centerline candidate, and the centerline obtained in the 133rd step The 134th candidate from which the length, distance, and road width are closest to the selected road line segment is selected, and the selected centerline candidate is determined as the centerline for the selected road line segment. And a process.

According to the 39th aspect of the present invention, there is provided an automatic road network information generating apparatus, wherein the small scale road network information and the large scale road edge information are converted into the same coordinates, and a coordinate converting means for converting the small scale road network information into the same coordinate. 1 from road network information
Corresponding center line extraction means for selecting the road line segments one by one and extracting the center line in the large-scale road edge information corresponding to the road line segment, and the corresponding center line extracting means, Additional information inheriting means for inheriting the added information as the information added to the center line.

In the automatic generation method of road network information according to claim 40, the 21st step of certifying the road surface side for the road edge information and the 21st step for the road edge information for which the road surface is not certified. The second side to certify the road surface side based on the road edge information in which the road surface side has been certified in the process
2nd process, 23rd process of certifying the road edge line segment of the pair which constitutes the road surface from the road edge information newly recognized on the road surface side in the 22nd process, and the pair certified in the 23rd process 24th step of obtaining the center line based on the road edge line segment of.

With this method, the road surface side is not recognized based on a part of the road edge information whose road surface side is recognized. For example, even the detailed road edge information can be recognized on the road surface side. Information can be built.

In the automatic generation method of road network information according to claim 41, in the automatic generation method of road network information according to claim 40, all road edge information is accumulated in the 21st step. Road edge information having the corresponding center line information by inputting the road edge information and the center line information respectively from the road edge information storage means and the center line information storage means in which the center line information is stored It is characterized by certifying the road side.

In the automatic generation method of road network information according to claim 42, in the automatic generation method of road network information according to claim 40, in the 21st step, the road edge information is displayed on the display means. Then, the operator instructs the road surface side through the instructing means with respect to the road edge information displayed on the display means.

In the automatic generation method of road network information according to claim 43, in the automatic generation method of road network information according to claim 40, said 22nd step is a road whose road surface is not certified. It is characterized by including a 221st step of extracting edge information and a 222nd step of certifying a road surface side for road edge information whose extracted road surface is not certified.

According to the 44th aspect of the present invention, in the automatic generation method of road network information according to the 40th aspect, in the 24th step, a newly created center is created. It is characterized in that the information on the entire center line is configured by adding the information on the line to the information on the already created center line.

In the automatic generation method of road network information according to a forty-fifth aspect, in the automatic generation method for the road network information according to a forty-first aspect, in the twenty-fourth step, the certification is made in the twenty-third step. It is characterized in that the center line is obtained by connecting the midpoints of the end points of both ends of the overlapping portion of the pair of road edge lines.

In the road network information automatic generation apparatus according to the 46th aspect, with respect to the road edge information from which the center line is extracted, a road surface recognizing process for recognizing the road surface side based on the information of the center line. Regarding the means and the road edge information for which the road surface is not certified, the uncertified road edge information road surface authorization means for authorizing the road surface side based on the road edge information that the road surface side is authorized by the road surface authorization processing means, Unauthorized road edge information From the road edge information that the road surface side has been newly identified by the road surface authorization means, the pair of road edge line segment authorization processing means that authorizes the pair of road edge line segments that make up the road surface, and Center line extraction means for obtaining the center line based on the pair of road edge line segments certified by the road edge line segment authorization processing means.

[0076]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a method for automatically generating road network information according to the present invention. As shown in the figure, the present invention is composed of the following three parts. That is, first, a center line, that is, accurate road network information is obtained for road edge information on a large-scale map based on road network information on a small-scale road network map (hereinafter referred to as teaching road network information) ( Step 101). However, since the road network information in the small-scale road network map is rough, the center line cannot be obtained even for the fine road edge in the road edge information in the large-scale map. Therefore, secondly, based on the road edge line segment for which the center line is required, that is, which is the road surface, the center line, that is, for the fine road edge line segment for which the road surface is not known, Request detailed road network information (step 10)
2). However, even with the function of the second configuration, the road network information is interrupted at an intersection or the like and is incomplete. Therefore, thirdly, the road network information obtained by the second configuration is interpolated to obtain complete road network information (step 103).

FIG. 2 is a diagram showing a portion related to the first configuration of one embodiment in the automatic road network information generating apparatus of the present invention. A method of obtaining a center line for road edge information on a large scale map using teaching information as road network information on a small scale road network map will be described below with reference to FIG.

The accurate road network information automatic generation apparatus 100 shown in the figure converts the road edge graphic of the road edge graphic information storage unit 11 and the road network information of the road network graphic information storage unit 13 into the same scale and the same coordinate system. The coordinate conversion unit 110 that superimposes and superimposes all the line segment management numbers and slopes of the road edge graphic of the road edge graphic information storage unit 11 and the road network information of the road network graphic information storage unit 13,
Road network information acquisition unit 12 for angle and length
0, a line segment calculation unit 130 that extracts line segment candidates from road edge figures corresponding to the taught road network information, a center point candidate acquisition unit 140 that extracts road center point candidates, and a road center line candidate is extracted. Centerline candidate acquisition unit 15
0, a centerline determination unit 160 that uses the most approximate road centerline candidate as a centerline, and a control unit 170 that controls each component. In particular, the control unit 170, until all center lines and road widths can be acquired, the line segment calculation unit 130, the center point candidate acquisition unit 140, the center line candidate acquisition unit 150, and the center line determination unit 1.
Control 60.

The road edge graphic information storage unit 11 is an external storage device, and receives a large scale road edge graphic with a scale of 1/500 to 10000.

The road network graphic information storage unit 13
External storage device, reduced scale 1 / 25000-50000
As a small scale road network map of and the attributes of the road,
Data such as road name, speed limit, one-way road, toll road, motorway, national road, prefectural road, city road, private road, etc. are entered.

Accurate road network information automatic generation device 1
The detailed map database 15 that stores the data generated by 00 is an external storage device that stores a large-scale map that includes the road for which the center line and the road width have been obtained. Data such as speed, one-way road, toll road, automobile road, national road, prefectural road, city road, and private road are inherited and stored.

The additional information storage unit 17 is an external storage device, and stores additional information such as management numbers, inclinations, angles, and lengths of the line segments acquired by the road network information acquisition unit 120.

FIG. 3 is a flow chart for explaining the operation of the accurate road network information automatic generation apparatus 100. The operation will be described below with reference to FIG.

In step 301, the coordinate conversion unit 11
0 inputs the road edge graphic from the road edge graphic information storage unit 11, acquires the road network information from the road network graphic information storage unit 13, converts it to the same scale and the same coordinate system, and converts the road edge graphic and the road network. Overlay two maps of information. Details will be described later with reference to FIG.

In step 302, the road network information acquisition unit 120 determines the line segment of the road edge information in the road edge graphic information storage unit 11 and the road network graphic information storage unit 1.
For all line segments of 3, control number, tilt, angle,
The length is calculated, and the additional information storage unit 1 is added as additional information for each line segment.
7 is stored.

In step 303, the line segment calculation unit 13
At 0, all line segment candidates of the road edge graphic corresponding to the taught road network information obtained at step 301 are extracted. That is, all the line segments that exist near the road segment t _i from the line segments of the road edge graphic and are nearly parallel to one road segment t _i forming the taught road network information are obtained. is there. Details will be described later with reference to FIG.

In step 304, the center point candidate acquisition unit 140 finds and finds the intersections of the horizontal or vertical scanning line and the road edge line segment with respect to all the road edge line segments found in step 303. The respective midpoints between the plurality of intersections are set as road center point candidates. Details will be described later with reference to FIG.

At step 305, the centerline candidate acquisition unit 150 connects the road center point candidates obtained at step 304 to generate a centerline candidate. Details will be described later with reference to FIGS. 7, 8 and 9.

In step 306, the center line determining section 160 selects a candidate whose length, distance and road width are closest to the road segment t _i of the taught road network information from the center line candidates obtained in step 305. Then, the selected center line candidate is determined as the center line for the road segment t _i . Details will be described later based on FIGS. 10A and 10B.

At step 307, the controller 170
Determines whether or not the processing has been completed for all line segments, and if not completed, returns to step 303,
If it has ended, the process proceeds to step 308.

At step 308, the controller 170
Causes the correct center line obtained by the processing up to step 307 to inherit the information of the corresponding teaching road network information.

The operation of the control section 170 will be supplementarily described. Although omitted in the flowchart shown in FIG. 3, the control unit 170 determines whether or not all the line segments t _i of the road network information have been processed after the end of step 302, and the lines not yet executed. If there is a minute, control is returned to step 302 again. Step 3
After the end of 03, it is determined whether or not the corresponding line segment candidates have been extracted for all the teaching road network information, and if there is teaching road network information that has not been extracted,
Control is performed to return to step 303 again. After step 304, it is determined whether or not the road center point candidates have been obtained for all the road edge line segments obtained in step 303. If not, step 304 is repeated.
Control to return to. In addition, it is determined whether or not one or more centerline candidates are obtained after the end of step 305. In this way, by making a judgment based on the respective judgment conditions at the end of the processing of each step, it is possible to surely obtain the corresponding center line and road width in the road edge graphic for all the line segments of the taught road network information. it can.

By assigning the management number given to the road line segment of the road network information as the obtained management number of the corresponding center line, the road attribute of the road line segment of the road network information, that is, the road name and the restriction. Data such as speed, one-way traffic, toll roads, motorways, national roads, prefectural roads, city roads, private roads, etc. can be inherited as is to road edge figures.

FIG. 4 is a diagram for explaining the operation of the coordinate conversion unit 110. As shown in FIG.
0 is the small scale road network a acquired from the road edge graphic information storage unit 11 and the road network graphic information storage unit 1
The large-scale road edge line segment figure b acquired from 3 is superimposed on the same coordinate system.

FIGS. 5A and 5B are diagrams for explaining the operation of the line segment calculation unit 130. As shown in FIG. 5A, the line segment calculation unit 130 first selects one road line segment t _i of the taught road network in the two maps that are superposed in the same coordinate system. At this time, if the selected road line segment has a predetermined length (for example, 10 meters) or less, it may be unconditionally discarded. Next, the selected road segment t _i, as shown in Figure 5B, the road edge shapes that road segment t _i from within a predetermined distance EL, and the angle between the road segment t _i is within a predetermined ET All the inside line segments are selected and used as the center line selection target line segment (that is, the road edge line segment selected for obtaining the center line). Specifically, with the road segment t _i teachings road network shown in the figure, the predetermined distance EL from the road segment t _i (e.g., 50 meters) less, and the angle between the road segment t _i given When all the line segments in the road edge graphic within ET (for example, −45 degrees to +45 degrees) are selected, the center line selection target line segment c is obtained.
Incidentally, the road line segment t _i selected from the midpoints of the line segments of the road edge graphic
A condition that the selected road line segment t _i is reached by dropping a perpendicular line to the line or that the line segment of the road edge graphic and the selected road line segment t _i overlap each other by a predetermined length or more. May be added. Also, the line segment c targeted for center line selection
The upper limit may be set on the assumption that a considerable amount or more will be obtained.

FIG. 6 is a diagram for explaining the operation of the center point candidate acquisition section 140. The center point candidate acquisition unit 140
A scanning line d in the horizontal or vertical direction is drawn for all the center line calculation target line segments extracted by the line segment calculation unit 130, and all intersections e with the center line calculation target line segment are obtained. Incidentally, the line segments t _i and X of the road network information
The angle with the axis is 0 degrees ≤ θ ≤ 45 degrees or 135 degrees ≤ θ ≤ 18
When the angle is 0 degree, the scanning line d which is vertical, that is, parallel to the Y axis is drawn, and when the angle is 45 degrees <θ <135 degrees, the scanning line which is horizontal, that is, parallel to the X axis is drawn. Then, the midpoints of all the obtained intersections e are set as road center point candidates f. In the figure, f indicated by "●" is a road center point candidate. At this time, if the road center point candidate f is inside the closed region in the road edge graphic, it may be discarded from the candidates. In the figure, the numbers ID124, ID456, etc. are management numbers assigned to the center line selection target line segment c.

Further, the obtained road center point candidates f are
Information on the management numbers, inclinations, angles, and lengths of the two referenced road edge line segments and the management numbers of the line segments of the corresponding teaching road network information and the road width g related to those road edge line segments are added. ing. As a result, when the center line can be extracted, the attribute information of the line segment of the road network information can be taken over by the center line based on the management number.

FIGS. 7 and 8 are diagrams for explaining the operation of the centerline candidate acquisition unit 150. The center line candidate acquisition unit 150 connects the road center point candidates f having the same road edge line segments on both sides used when obtaining the road center point candidate f to create a center line candidate. However, it is limited to only those satisfying the following conditions. That is, the distance between the road center point candidates f is within a predetermined distance,
It is required that the road width does not change more than a predetermined value times between adjacent road center point candidates f, and that the angle at which the center line bends is not more than a predetermined value.

The centerline candidate acquisition unit 150 numbers each road center point candidate f so that it can be easily searched. That is, the numbering is performed in the order of the arrangement of the scanning lines, and the road center point candidates f on the same scanning line are consecutively numbered.

For example, when the scanning line is drawn in the horizontal direction, it becomes as shown in FIG. In the figure, the order of searching for connecting the road center point candidate My1 to be connected next from the road center point candidate My1 is My on the next scanning line.
2, My3, My4, and then My
One of 5, My6 and My7. By thus numbering, the search can be performed efficiently. That is, My1 → (any of My2, My3, My4)
→ (any one of My5, My6, My7) → ... Can be searched efficiently because the candidates are limited. If the numbering is not performed in this way, the candidates to be concatenated are not limited, so My1 → (all the remaining My
? ) → (all remaining My?) → ..., so the search is extremely inefficient.

Further, when the scanning line is drawn in the vertical direction, it becomes as shown in FIG. In the same figure, the order of searching for connecting the road center point candidate My1 to be connected next from the road center point candidate My1 is any one of My2, My3, and My4 on the next scanning line, as in the horizontal direction. ,
Next is any one of My5, My6, and My7.

With the numbering process, the process of connecting the road center point candidates can be performed at high speed.

FIG. 9 is a diagram showing an example of centerline candidates extracted by the processing of the centerline candidate acquisition unit 150.

FIG. 10 is a diagram for explaining the operation of the center line determining unit 160. Center line determination unit 16
0 determines a center line from the extracted center line candidates. Specifically, the length is close to the length of t _i, short distance to the road segment t _i, the road width is selected as close to the road width of the road segment t _i as a center line. In addition to these indices, for example, a process of unconditionally discarding the center line that intersects the road edge may be added. For each center line candidate in FIG. 10A, a center line as shown in FIG. 10B is extracted.

In association with the above processing, the management number attached to the road line segment of the referred teaching road network information is
The obtained center line is assigned as a management number. As a result, the information attached to the road line segment of the referred teaching road network information is inherited as it is to the obtained center line. On the other hand, by adding the management numbers of the corresponding two road edge line segments on both sides and their attribute information to the obtained center line, the information of the road edge graphic of the large scale map can be inherited. That is, a center line with accurate and rich attribute information, that is, a road network can be obtained on a large-scale map.

With the above processing, as the processing of step 101 shown in FIG. 1, the small scale or rough road network information is used as the teaching information, and the accurate center line from the large scale road edge graphic, that is, the accurate road network information. Can be configured.

FIG. 11 is a diagram showing a specific example of the center line extracted by the above processing. As shown in the figure, it can be seen that the center line of the road edge graphic having the corresponding road network is surely extracted. However, in order to obtain a more detailed and accurate center line, it is necessary to use the second and third configurations in FIG. 1 described later.

FIG. 12 is a diagram showing another example of the portion related to the first configuration of one embodiment in the automatic road network information generating apparatus of the present invention. In this example,
There is no road network information acquisition unit 120 and additional information storage unit 17, and step 302 in the above example is deleted. Therefore, the operation processing procedure is as shown in FIG. However, in this case, in the processing from step 1302 onward, it is possible to have the same function as the above-described example by calculating the management number, inclination, angle, and length for every line segment each time. Conversely speaking, if the information is obtained and stored at one time as in the above example, it is not necessary to obtain it each time in the subsequent processing.

Next, based on the road edge line segment for which the center line is obtained, that is, which is the road surface, the center line, that is, for the fine road edge line segment whose road surface is unknown. A second configuration for obtaining road network information will be described.

In the processing according to the second configuration, in the road edge graphic information, the road surface side of which the road surface side is unknown is determined based on the road edge line segment whose road surface side is known. The process of obtaining the center line, but when the road surface side is known, the center line can be easily obtained. Therefore, the process of obtaining the more detailed center line is used by using the result of the process according to the first configuration. As described below.

FIG. 14 is a diagram showing a portion relating to the second configuration of one embodiment in the automatic road network information generating apparatus of the present invention.

The detailed road network information automatic generation apparatus 200 shown in the same figure is based on the information of the center line, the road surface qualification processing unit 21 for recognizing the road surface side of the road edge graphic.
0, unaccredited line segment that certifies the road surface side for road edge lines whose road surface side is not certified based on the road surface line certified for the road surface side. It is composed of a road edge segment recognizing unit 230 for obtaining a road edge segment of the pair to be constructed, and a center line extracting unit 240 for obtaining a center line based on the road edge segment of the pair whose road surface side is newly identified. ing.

The road surface recognition processing unit 210 inputs the information of the road edge line segment from the road edge graphic information storage unit 11 and the information of the center line from the main road center line information storage unit 19, and Based on the information, the road surface side is certified for the road edge line segment corresponding to the center line. The information of the center line is rough because it is obtained based on the network information of the small-scale road network graphic as described above, and therefore the detailed road surface edge line segment is as described above. The road side cannot be certified. For example, the road edge line segment u ₁ and the road edge line segment u ₂ in FIG. 36 cannot be recognized.

The unaccredited line segment road surface certifying section 220 is composed of an unaccredited line segment string extracting section 221 and a road surface certifying section 222. The uncertified line segment extraction unit 221 extracts a road edge line segment whose road surface side is not certified (hereinafter, referred to as an uncertified road edge line segment). Further, the road surface certifying unit 222 certifies the road surface side of the extracted uncertified road edge line segment.
The process in the unrecognized line segment road surface certifying unit 220 will be described in detail later. The road edge segment recognizing unit 230 certifies a pair of road edge segments that form a road surface newly certified by the uncertified line segment road surface certifying unit 220. The center line extraction unit 240 obtains the center line based on the pair of road edge line segments certified by the pair of road edge line segment certification processing unit 230, and when there is no uncertified road edge line segment, or at the center line. Each time, is obtained, the center line obtained together with the existing center line is stored in the detailed road network information storage unit 21.

By this processing, the road surface side is also certified for the unrecognized road edge line segment based on the road edge line segment for which the road surface side is certified due to the existence of the center line, etc., and the center line is obtained. By extension, detailed road network information can be obtained.

When the road surface recognizing processing unit 210 authenticates the road surface side, an inappropriate center line may exist. In that case, the following compensation processing is performed. For example, assume that a road edge line segment and a center line as shown in FIG. 15 are input from the road edge graphic information storage unit 11 and the road network graphic information storage unit 13, respectively. In this case, by comparing the sizes by adding the possibility of each line segment having the road surface side on the right side and the possibility of each line segment having the road surface on the left side for the inconsistent road edge line segments, Inappropriate centerline is deleted.

FIG. 16 shows an uncertified line segment road surface certifying section 22.
6 is a flowchart showing details of the processing in 0. FIG. 17 is a diagram showing a data structure for forming a road edge line segment sequence. This data structure includes a graphic type that represents the data type, the number of constituent points N that represents the number of points that make up the line segment sequence, a road surface certification flag F that indicates whether the road surface is certified, and a line segment sequence. It has each field of the line segment sequence constituent point coordinate value which is a sequence of the coordinate values of the points constituting the.

When the road surface side has already been certified due to the presence of a corresponding center line, etc., the road surface certification flag F is set to ON (= "1"). Further, the coordinates of the constituent points forming the line segment sequence are arranged in such an order that the right side is always the road surface when the arrangement is traced from the start point to the end point. On the other hand, in the case where the road surface side is a line segment string that is not certified, the road surface certification flag F remains set to OFF (= “0”).

Hereinafter, FIG. 16, FIG. 17, FIG. 18, and FIG.
Based on FIG. 9, the process in the unaccredited line-segment road surface certifying unit 220 will be described in detail.

The unaccredited line segment extraction unit 221 makes one line segment a road edge line segment (hereinafter referred to as an authorized road edge line segment) whose road surface side is authorized by the road surface authorization processing unit 210. It is extracted for each (step 1601). If there is no road edge line segment to be taken out (step 1602), it is determined that all road edge line segments whose road surface side is authorized have already been taken out, and the process ends. On the other hand, when the road edge line segment sequence is extracted, one end point of the line segment sequence is set as the current end point Tc (step 1603). Next, it is determined whether the current end point Tc constitutes an end point of another road edge line segment whose road surface side is certified (step 160).
4). When it is determined that the other end points of the road edge line segment are configured, it is determined whether or not both end points of the line segment row being taken out are checked (step 1605). To check other end points, the process returns to step 1603. If it is determined that both end points have been checked, the process returns to step 1601 to extract the next line segment sequence.

If it is determined in step 1604 that the current end point Tc does not constitute an end point of another road edge line segment whose road surface side is approved, an unapproved road edge whose end point is the current end point Tc. It is determined whether there is a line segment sequence (step 1607). When it is recognized that there is an unrecognized road edge line segment with the current end point Tc as the end point,
That is, when unrecognized road edge lines are connected,
The procedure moves to step 1611. In step 1611, the road surface of the unrecognized road edge line segment is certified. This authorization is performed by the road surface authorization unit 222 described above. The road surface certifying unit 222 sets the other end point of the line segment that certifies the road surface as the new current end point Tc, activates the uncertified line segment sequence extracting unit 221, and returns to step 1607.

On the other hand, when it is determined in step 1607 that there is no unrecognized road edge line segment whose end point is the current end point Tc, whether there is an end point of another line segment row in the vicinity of the current end point Tc. That is, it is determined whether there is a line segment sequence in the vicinity (step 1608). If the end points of the other line segment sequence are not in the vicinity, the process returns to step 1601 to take out the next unchecked certified line segment sequence. On the other hand, if the endpoints of another line segment sequence are in the vicinity, the endpoint that was in the vicinity thereof is set as the current endpoint Tc (step 1609), and the line segment whose endpoint is the current endpoint Tc is recognized by the road surface. It is determined whether or not the line segment sequence is set (step 1610). If the line segment sequence is a line segment sequence in which the road surface is certified, the process returns to step 1601 to take out the next unchecked certified line segment sequence. On the other hand, if the line segment sequence is a line segment sequence for which the road surface is not certified, the process proceeds to step 1611 and the road surface is certified for the line segment sequence.

The above processing will be described with a specific example. FIG.
FIG. 3 is a diagram showing a specific data structure of a line segment sequence. The figure shows a line segment sequence consisting of points A ₁ , A ₂ , A ₃ , A ₄ , and A ₅ , of which the line sequence from points A ₁ to A ₄ is recognized on the road surface side. However, the road surface side of the line segment from points A ₄ to A ₅ is not certified. Therefore, point A
The line segment sequence from ₁ to A ₄ is represented by the data structure shown in (a), and the line segment sequence from A ₄ to A ₅ is represented by the data structure shown in (b).

First, the unchecked certified line segments A _{1 to} A ₂
Is taken out (step 1601) and A ₁ is set as the current end point (step 1603). Since A ₁ does not constitute an end point of another road edge line segment whose road surface side is authorized (step 1604), it is determined whether or not there is an unaccredited road edge line segment whose endpoint is A _1. (Step 1
607). Since purported road edge line segment sequence is not to the A ₁ and end point, whether or not there is purported road edge line segment sequences in the vicinity of A ₁ is determined (step 1608). Since there is no unrecognized road edge line segment in the vicinity of A ₁ , the process returns to step 1601.

Next, the unchecked certified line segments A _{2 to} A ₃
Is extracted (step 1601), and the same processing as when A ₁ is the current end point is repeated for the case where A ₂ and A ₃ are the current end points.

[0127] In step 1603, if A ₄ is set to the current end point, since A ₄ does not constitute an end point of another road edge line segment sequence that is certified road surface (step 1604), the A ₄ endpoints It is determined whether or not there is an unrecognized road edge line segment (step 1607). In this case, there is a purported road edge line segment sequence of the A ₄ and end point,
The procedure moves to step 1611.

In recognizing the road surface of the unrecognized road edge line segment in step 1611, it is necessary to certify the road surface such that the right side from the start point to the end point of the line segment is always the road surface. In this case, the current end point A ₄ is the end point in the unaccredited road edge line segment (b), that is, the unaccredited road edge line segment (b) is represented as line segment sequences A _{5 to} A _4. Therefore, the unrecognized road edge line segment (b) is set as the authorized road edge line segment, and the qualification processing is performed such that the end point A ₄ is the starting point and the end point A ₅ is the end point. As a result, the line segment sequence after the approval process is rearranged into line segment sequences A _{4 to} A ₅ as shown in the lower part of FIG. 18, and the road authorization flag F is set to 1.

Next, in step 1612, A ₅ is recognized as a new current end point, and the process returns to step 1607. Since there is no unaccredited road edge line segment having A ₅ as the end point (step 1607), it is determined whether or not there is an unaccredited road edge line segment in the vicinity of A ₅ (step 1608). A
Since there are no unlicensed road edge lines in the vicinity of ₅ , step 1
Return to 601. In step 1601, even if an unchecked authorized line segment row is to be taken out, all the authorized line segment rows have already been checked (step 1602), so the series of road surface qualification processing ends.

Next, steps 1608 to 16
A specific method of the processing up to 10 will be described.
These processes are effective for a road edge graphic including a road edge line segment with a break as shown in FIG. FIG. 19 is a diagram for explaining the specific method.

As shown in the figure, when the current end point Tc is not the end point of the unrecognized road edge line segment, a radius r centering on the end point Tc (for example, it can be expressed by the scale of the map to be processed). The maximum road width template is set, and it is determined whether or not there is an end point of another road edge line segment therein (step 1608). If the end point of another road edge line segment sequence does not exist in the set template, the line segment sequence relating to the current end point Tc is regarded as an isolated line segment sequence, and the process returns to step 1601. On the other hand, if there is an end point of another road edge line segment in the set template, the end point is set as a new current end point Tc (step 1609), and the line segment related to the end point Tc is a road surface. It is determined whether or not it has been certified (step 1610). End point T
If the line segment related to c is not certified, step 1
Move to 611 and certify the road surface. In recognizing this road surface, if the previous current end point is the end point, the new current end point is the start point, and if the previous current end point is the start point, the new current end point is the end point. The road surface side is also certified for the missing parts.

Next, a specific example of conditions for extracting a pair of road edge line segments in the road edge line segment recognition processing unit 230 will be described. FIG. 20 is a diagram for explaining this specific example.

When a pair of road edge line segments is obtained with respect to the road edge line segment L in FIG. 20 (a), for example, the road sides are facing each other, and at least in the area defined by the road edge line segment L. It is a road edge line segment that includes a part, the distance from the midpoint of the road edge line segment to the road edge line segment L is the shortest, and it is close to parallel at a predetermined angle or less, Is a condition.

Further, as shown in FIG. 20B, when the road edge line segment is nearly parallel to the X-axis, it is checked whether or not there is overlap in the area defined in the X-axis area. Check if the road can extract the line. If the road edge segment is close to parallel to the Y-axis, Y
Check if there is overlap in the area delineated in the axis area.

Next, a specific method of extracting the center line in the center line extracting section 240 will be described. FIG. 21 is a diagram for explaining this specific extraction method. As shown in the figure, the center line is extracted, for example, by connecting the midpoints of the end points of both ends of the overlapping portion of the road edge line segment. At this time, it is checked whether the obtained center line intersects the road edge line segment, and if it intersects, the center line may not be the center line.

In this way, the information of the phase structure is extracted from the road edge line segment of which the road surface side is recognized, and the information of the phase structure is combined with the information of the center line already obtained in the above-mentioned first configuration. As a result, detailed center line, that is, road network information can be created.

FIG. 22 is a diagram showing another example of the portion related to the second configuration of one embodiment in the automatic road network information generating apparatus of the present invention. In this example,
Rather than being given centerline information about rough roads, humans can interactively specify the roadside for some road edge lines, and the roadside is specified. It is possible to extract a center line for a road edge line segment whose road surface side is not specified based on the road edge line segment.

The operator selects a part of the road edge line segment from the road edge line segment string displayed on the display 23 through the input device 25 and certifies the road surface side of the road edge line segment. , And notifies the road surface instruction input unit 252. The road surface instruction input unit 252 sends the notified information to the unrecognized line segment road surface authentication unit 220. Unauthorized line segment Road surface certification section 220
On the basis of this information, certifies the road surface side of the uncertified road edge line segment sequentially in the same manner as described above. Further, the contents of the processing by the road edge segment recognition processing unit 230 and the center line extraction unit 240 are also the same as described above.

According to this method, the processing is not performed on the basis of the incorrect information of the center line, so that the processing is accurate.

With the above second configuration, center lines, that is, road network information can be obtained even for fine roads. However, even with the second configuration, the center line may be interrupted and incomplete, for example, at an intersection. Therefore, the following third configuration is executed to interpolate this discontinuity and construct a complete center line, that is, complete road network information.

FIG. 23 is a diagram showing a portion relating to the third configuration of one embodiment in the automatic road network information generating apparatus of the present invention. A complete road network information automatic generation apparatus 300 that realizes the third configuration includes a processing unit 320 that determines a dead end of an end point of a center line,
Processing unit 330 for connecting the end points of the center line with a line segment
And a processing unit 340 for obtaining an intersection node and a processing unit 35 for connecting a center line intersecting with an extension line of the center line.
0, a processing unit 360 that connects the center lines at the intersections of the extension lines of the center lines, and a processing unit 370 that determines the end point node. Moreover, the control part 310 which controls them is also included.

Complete Road Network Information Automatic Generation Device 3
00 inputs detailed center line information from the detailed road network information storage unit 21, performs each processing in each processing unit, and outputs the obtained complete center line information to the complete road network information storage unit 27. Hereinafter, each processing unit will be described.

FIG. 24 is a flow chart showing the processing procedure of the processing section 320 for judging the dead end of the end point of the center line. FIG. 25 is a diagram for explaining the processing of the processing unit. First, one center line data is acquired (step 2401). Focusing on the leading point and the trailing point of the center line, the corresponding road edge line segment is extracted (step 2402). Based on the corresponding road edge line segment, it is determined whether the end point of the center line is a dead end (step 2403). Whether or not it is a dead end is determined based on the following criteria, for example. That is, for example, whether the extracted road edge line segment is the head of a pair of road edge line segments, or whether the extracted road edge line segment is a single road edge line segment, and the extracted road edge line segment Judgment is made based on the condition whether the end points of the and the center line are in the vicinity. As a result of the determination, when it is determined that the center line is a dead end, the end point of the center line is set as the end point node (step 240).
4). At this time, data such as the coordinates of the end points are stored in a predetermined file. On the other hand, if it is not a dead end, the process directly proceeds to step 2405. Step 2
At 405, it is determined whether or not the check has been completed for all the center lines. If not completed, the process returns to step 2401, and if completed, a series of processes is completed.

FIG. 26 is a flow chart showing the processing procedure of the processing unit 330 which connects the end points of the center lines with line segments. FIG. 27 is a diagram for explaining the processing of the processing unit. First, one center line data is acquired (step 2601). It is determined whether or not both end points of the center line are already connected (step 2602), and if they are already connected, the process returns to step 2601 to acquire the next center line. On the other hand, if not connected, another center line that can be connected is searched (step 260).
3). The conditions of whether or not they can be connected are, for example, that the end points are less than or equal to a predetermined distance, the angle between the center lines is less than or equal to a predetermined angle, and the connected center line does not intersect the road edge line segment. ,. It is determined whether there is a connectable center line (step 2604),
If there is, a connection process is performed (step 260).
5). Specifically, for example, the newly created center line is registered in a predetermined file, and both end points thereof are set as “connected”. If there are a plurality of connectable center lines, the center line that most matches the conditions is selected. On the other hand, if there is no connectable center line, the process directly goes to step 2606. Step 2
In 606, it is determined whether or not the check is completed for all the center lines. If not completed, the process returns to step 2601, and if completed, a series of processes is completed.

FIG. 28 shows a processing unit 34 for obtaining an intersection node.
9 is a flowchart illustrating a processing procedure of No. 0. FIG.
It is a figure for demonstrating the process of this process part. First, one center line data is acquired (step 2801).
It is searched whether there is another center line that intersects the center line (step 2802). It is determined whether there is an intersecting center line (step 280).
3) If there is, each center line is divided at the intersecting points (step 2804). On the other hand, if there is no intersecting center line, the process directly goes to step 2805. In step 2805, it is judged whether or not the check is completed for all the center lines, and if it is not completed, step 2801
If it is completed, the series of processing is completed.

FIG. 30 is a flow chart showing the processing procedure of the processing unit 350 for connecting the center lines intersecting the extension lines of the center lines. FIG. 31 is a diagram for explaining the processing of the processing unit. First, one center line data is acquired (step 3001). It is determined whether both end points of the center line have already been connected (step 30).
02), if already connected, the process returns to step 3001 to acquire the next center line. On the other hand, if not connected, another center line that can be connected is searched (step 3003). The conditions of whether or not connection is possible are, for example, that the extension line of the center line intersects with another center line, that the distance from the intersection point with the center line is less than a predetermined distance, and that the center line after connection is Do not cross the road edge line. It is determined whether or not there is a connectable center line (step 3004), and if there is a center line, connection processing is performed (step 3005). Specifically, for example, the selected center line is extended by the actual extension line and registered, and other reached center lines are divided at the intersecting points. In addition, the crossing point is defined as “connected”. If there are a plurality of connectable center lines, the center line that most matches the conditions is selected. On the other hand, if there is no connectable center line, the process directly goes to step 3006. Step 3
In 006, it is determined whether or not the check has been completed for all the center lines. If not completed, the process returns to step 3001, and if completed, a series of processes is completed.

FIG. 32 is a flow chart showing the processing procedure of the processing unit 360 for connecting the center lines at the intersections of the extension lines of the center lines. FIG. 33 is a diagram for explaining the processing of the processing unit. First, one center line data is acquired (step 3201). It is judged whether both end points of the center line are already connected (step 3
202), if connected, the process returns to step 3201 to acquire the next center line. On the other hand, if not connected, another center line that can be connected is searched (step 3203). The condition of whether or not connection is possible is, for example,
The distance between the intersecting point and each center line is less than a predetermined distance, the intersection angle is not nearly parallel (greater than a predetermined angle), and the connected center line is a road edge line segment. Do not cross. It is determined whether there is a connectable center line (step 320).
4) If there is, a connection process is performed (step 3205). Specifically, for example, both center lines are extended by the amount of the actual extension line and registered, and the intersecting point is set as “connected”. If there are a plurality of connectable center lines, the center line that most matches the conditions is selected. On the other hand, if there is no connectable center line, the process directly goes to step 3206. In step 3206, it is determined whether or not the check has been completed for all the center lines. If not completed, the process returns to step 3201, and if completed,
A series of processing ends.

FIG. 34 shows a processing unit 37 for finding an end point node.
9 is a flowchart illustrating a processing procedure of No. 0. FIG. 35 shows
It is a figure for demonstrating the process of this process part. First, one center line data is acquired (step 3401).
It is determined whether there is an end point that is not connected (step 3402). If there are endpoints that are not connected,
The end point is registered in a predetermined file as an end point node (step 3403). On the other hand, if there is no end point that is not connected, the process directly proceeds to step 3404. In step 3404, it is determined whether or not the check has been completed for all the center lines. If it has not been completed, the process returns to step 3401, and if it has been completed,
A series of processing ends.

[0149]

As described above, according to the first configuration, the accurate center line of the road edge graphic, that is, the accurate road network information is obtained based on the rough road network information. Further, with the second configuration, the center line can be obtained for the detailed road edge information in the road edge graphic. That is, accurate and detailed road network information can be obtained. Further, with the third configuration, a perfect center line can be obtained. That is, accurate, detailed and complete road network information can be obtained.

Specifically, by referring to the road network information, which has low accuracy but is low in input cost, it becomes possible to automatically obtain the center line and the road width in a highly accurate scale map. It has a remarkable effect that the cost of can be drastically reduced.

Further, a highly accurate large scale map having road network information can be created. As a result, it can be used for business that requires detailed position measurement and correction, and can also be used as detailed map information for determining whether a large vehicle such as a fire engine can pass.

Further, the created detailed map holds the management number of the road network information. This allows
It becomes a detailed map database including information that can be searched from the management number of the teaching road network information, and it is possible to construct an extremely high map database that has detailed and advanced information and is highly useful.

That is, an accurate, detailed, and complete database can be created, and a map information database that includes road network information and has a very high utility value can be constructed, which has a great effect on effective use.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a method for automatically generating road network information according to the present invention.

FIG. 2 is a diagram showing a part according to a first configuration of an embodiment in the automatic road network information generating apparatus of the present invention.

FIG. 3 is a flowchart for explaining the operation of the accurate road network information automatic generation device.

FIG. 4 is a diagram for explaining the operation of a coordinate conversion unit.

FIG. 5 is a diagram for explaining the operation of a line segment calculation unit.

FIG. 6 is a diagram for explaining the operation of a center point candidate acquisition unit.

FIG. 7 is a diagram for explaining the operation of a centerline candidate acquisition unit.

FIG. 8 is a diagram for explaining the operation of a centerline candidate acquisition unit.

FIG. 9 is a diagram showing an example of centerline candidates extracted by the processing of a centerline candidate acquisition unit.

FIG. 10 is a diagram for explaining the operation of the center line determination unit.

FIG. 11 is a diagram showing a specific example of an extracted center line.

FIG. 12 is a diagram showing another example of the portion according to the first configuration of the embodiment in the road network information automatic generation device of the present invention.

FIG. 13 is a flowchart for explaining the operation of another automatic road network information automatic generation device.

FIG. 14 is a diagram showing a part according to a second configuration of one embodiment in the automatic road network information generating apparatus of the present invention.

FIG. 15 is a diagram showing an example of a road edge line segment and a center line respectively input from a road edge graphic information storage unit and a road network graphic information storage unit.

FIG. 16 is a flowchart showing in detail the contents of processing in an unaccredited line segment road surface certifying unit.

FIG. 17 is a diagram showing a data structure for forming a road edge line segment sequence.

FIG. 18 is a diagram showing a specific data structure of a line segment sequence.

FIG. 19 is a diagram for explaining a specific method of a process effective for a road edge graphic including a discontinuous road edge line segment.

FIG. 20 is a diagram for explaining a specific example of a condition when a pair of road edge line segments is extracted in the road edge line segment recognition processing unit.

FIG. 21 is a diagram for explaining a specific method of extracting a center line in a center line extracting unit.

FIG. 22 is a diagram showing another example of the portion related to the second configuration of the embodiment in the road network information automatic generation device of the present invention.

FIG. 23 is a diagram showing a part according to a third configuration of one embodiment in the road network information automatic generation device of the present invention.

FIG. 24 is a flowchart illustrating a processing procedure of a processing unit that determines a dead end of an end point of a center line.

FIG. 25 is a diagram for explaining the processing of the processing unit.

FIG. 26 is a flowchart illustrating a processing procedure of a processing unit that connects end points of center lines with line segments.

FIG. 27 is a diagram for explaining the processing of the processing unit.

FIG. 28 is a flowchart illustrating a processing procedure of a processing unit that obtains an intersection node.

FIG. 29 is a diagram for explaining the processing of the processing unit.

FIG. 30 is a flowchart illustrating a processing procedure of a processing unit that connects a center line that intersects with an extension line of the center line.

FIG. 31 is a diagram for explaining the processing of the processing unit.

FIG. 32 is a flowchart illustrating a processing procedure of a processing unit that connects center lines at intersections between extension lines of center lines.

FIG. 33 is a diagram for explaining the processing of the processing unit.

FIG. 34 is a flowchart showing a processing procedure of a processing unit for obtaining an end point node.

FIG. 35 is a diagram for explaining a process of the processing section.

FIG. 36 is a diagram showing an example of a road edge graphic of a large scale map having a scale of 1/2500.

FIG. 37 is a diagram showing an example of a road network map.

FIG. 38 is a diagram showing an example in which a small scale map and a large scale map are converted into the same coordinates.

[Explanation of symbols]

 11 road edge graphic information storage unit 13 road network graphic information storage unit 15 detailed map database 17 additional information storage unit 19 main road centerline information storage unit 21 detailed road network information storage unit 23 display 25 input device 27 complete road network information storage unit 100 Accurate road network information automatic generation device 110 Coordinate conversion unit 120 Road network information acquisition unit 130 Line segment calculation unit 140 Center point candidate acquisition unit 150 Center line candidate acquisition unit 160 Center line determination unit 170 Control unit 200 Detailed road network information automatic generation Equipment 210 Road surface certification processing unit 220 Uncertified line segment Road surface certification unit 221 Uncertified line segment extraction unit 222 Road surface certification unit 230 Road edge segment recognition processing unit 240 Center line extraction unit 251 Road edge line segment Display 252 road surface instruction input unit 300 complete road network information automatic generation device 310 control unit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koichi Ito 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (46)

[Claims] 1. A first step of extracting a center line for large-scale road edge information using small-scale road network information as teaching information, and a center line is extracted based on the road edge information from which the center line has been extracted. The second step of extracting the center line for the road edge information that is not included, and the third step of interpolating the center line obtained in the second step
A method for automatically generating road network information, which comprises a process and a process. 2. The eleventh step of converting the small-scale road network information and the large-scale road edge information into the same coordinates in the first step; and a road from the small-scale road network information one by one. A thirteenth step of selecting a line segment and performing a process of extracting a center line in the large-scale road edge information corresponding to the road line segment for all road line segments; and information added to the road network information. 14th information is inherited as information added to the center line
The method for automatically generating road network information according to claim 1, further comprising: 3. A twelfth step of, after the eleventh step, storing a management number and attribute information for each of the line segments forming the small scale road network information and the large scale road edge information. The method for automatically generating road network information according to claim 2, further comprising: 4. In each of the thirteenth step and the fourteenth step, each time a line segment to be processed is processed, its control number is stored and its attribute information is obtained and stored. The method of automatically generating road network information according to claim 2. 5. In the thirteenth step, the selected road line segment is within a predetermined distance from the selected road line segment among the road edge line segments of the road edge information, and the selected road line segment is selected. Step 131 for obtaining all road edge line segments having a predetermined parallelism with the road line segment, and horizontal or vertical scanning lines and the road for all road edge line segments obtained in the 131st step A center is formed by connecting the road center point candidates obtained in the 132nd step with the intersection point with the edge line segment and connecting the obtained middle points between the plurality of intersections as road center point candidates. The 133rd step of generating a line candidate, and the candidate whose length, distance and road width are closest to the selected road line segment is selected from the center line candidates obtained in the 133rd step, and is selected. Center Automatic method of generating road network information according to claim 2, characterized in that it comprises a first 134 step of determining a center line in the candidate for the selected road segments, a. 6. In the 132nd step, each road center point candidate corresponds to a management number and attribute information of the two referenced road edge line segments, and a road width corresponding to those road edge line segments. 6. A road line segment management number of road network information is added.
Automatic generation method of road network information described in. 7. In the 133rd step, each road center point candidate is numbered in the order of arrangement of the scanning lines, and road center point candidates on the same scan line are consecutively numbered. The road edge lines on both sides used when obtaining the center point candidates are the same, the distance between the road center point candidates is within a predetermined distance, and the road width is a predetermined value between adjacent road center point candidates. 6. The road according to claim 5, wherein the road center point candidates are connected to create a center line candidate on the condition that they do not change more than twice and the angle of refraction of the center line is equal to or less than a predetermined value. Automatic generation method of network information. 8. The method according to claim 134, wherein in each of the center line candidates, the length is close to the length of the road line segment, the distance to the road line segment is short, and the road width is the road line segment road. The method for automatically generating road network information according to claim 5, wherein one having a width close to one is selected as a center line. 9. In the second step, for the road edge information from which the center line is extracted, the road surface side is recognized based on the information of the center line.
Regarding the process and road edge information where the road surface is not certified,
The 22nd process that certifies the road surface side based on the road edge information whose road surface side has been certified in the process, and the road edge information that is newly certified in the 22nd process. 23. The step 23 of certifying the road edge line segment of, and the step 24 of obtaining the center line based on the pair of road edge line segments certified in the step 23. Automatic generation method of described road network information. 10. In the twenty-first step, road edge information and center line information are respectively provided from a road edge information storage means in which all road edge information is stored and a center line information storage means in which center line information is stored. 10. The method for automatically generating road network information according to claim 9, wherein the road edge information from which the center line is extracted is derived by inputting and corresponding. 11. The 22nd step is a 22nd step of extracting road edge information for which a road surface is not certified.
10. The method for automatically generating road network information according to claim 9, comprising: 1 step; and 222 step of certifying the road surface side of road edge information for which the extracted road surface is not certified. 12. The road network according to claim 11, wherein in the 221st step, road edge information for which a road surface adjacent to a road surface for which a road surface has been certified is not certified is extracted. How to automatically generate information. 13. The road edge information in which a continuous road surface is not certified is extracted in the vicinity of road edge information in which the road surface is certified in the 221st step. Automatic generation method of road network information. 14. In the step 222, when certifying the road surface side for road edge information for which the road surface is not certified, the road surface side is the same as the road edge information for which the road surface is certified. The method for automatically generating road network information according to claim 11, wherein a connection direction of road edge information whose surface is not certified is determined. 15. In the twenty-fourth step, further, the information of the newly created center line is added to the information of the already created center line, and the information of the entire center line is constituted. Item 10. A method for automatically generating road network information according to Item 9. 16. The center line is obtained in the 24th step by connecting the midpoints of the end points of both ends of the overlapping portion of the road edge line pairs recognized in the 23rd step. Claim 9
Automatic generation method of road network information described in. 17. The third step comprises a 31st step of determining a dead end of the end points of the center line obtained in the second step and a 32nd step of connecting the end points of the two center lines with a line segment.
Process, 33rd process to find the intersection of the intersecting center lines, 34th process to connect the center line intersecting the extension line of the center line with the extended center line, and extension of the two center lines The road network according to claim 1, further comprising: a thirty-fifth step of connecting the center lines at intersections of the lines and a thirty-sixth step of obtaining end point nodes for information of all the center lines. How to automatically generate information. 18. An accurate centerline information generating means for extracting a centerline for large-scale road edge information using small-scale road network information as teaching information, and a centerline based on the roadline information from which the centerline is extracted. Detailed centerline information generating means for extracting a centerline from road edge information for which no centerline information has been extracted, and complete centerline information generating means for interpolating the centerline obtained by the detailed centerline information generating means. Automatic generation device for road network information. 19. The accurate centerline information generating means includes coordinate converting means for converting the small scale road network information and the large scale road edge information into the same coordinates, and 1 from the small scale road network information. Corresponding center line extracting means for selecting the road line segments one by one and extracting the center line in the road edge information of the large scale corresponding to the road line segment, and the corresponding center line extracting means, The automatic generation device for road network information according to claim 18, further comprising: additional information inheriting means for inheriting the added information as the information added to the center line. 20. A storage unit for storing a management number and attribute information for each of the line segments forming the small scale road network information and the large scale road edge information. An automatic generation device for road network information according to item 19. 21. In each of the corresponding center line extracting means and the additional information generating means, a management number is stored every time a line segment to be processed is processed, and the attribute information is obtained. 20. The road network information automatic generation device according to claim 19, which is stored. 22. The corresponding center line extraction means is within the predetermined distance from the selected road line segment from among the road edge line segments of the road edge information regarding the selected road line segment, and Line segment calculation means for obtaining all road edge line segments having a degree of parallelism with the selected road line segment and horizontal or vertical scanning for all road edge line segments obtained by the line segment calculation means A center point candidate acquisition unit that obtains an intersection between the line and the road edge line segment, and sets each midpoint between the obtained intersections as a road center point candidate, and a road obtained by the center point candidate acquisition unit. A centerline candidate acquisition means for connecting the center point candidates to generate a centerline candidate, and a length, a distance and a road width are selected from the centerline candidates obtained by the centerline candidate acquisition means. 20. Center line determining means for selecting a candidate closest to a line segment and determining the selected center line candidate as a center line for the selected road line segment. Automatic generation device for road network information. 23. In the center point candidate acquisition means, for each road center point candidate, the management numbers and attribute information of the two referenced road edge line segments, and the road widths associated with those road edge line segments, The management number of the road line segment of the corresponding road network information is added.
The automatic generation device for road network information described in 2. 24. The centerline candidate acquisition means numbers each road center point candidate in the order in which the scanning lines are arranged, and consecutively numbers road center point candidates on the same scanning line. , The road edge segments on both sides used when obtaining the road center point candidates are the same, the distance between the road center point candidates is within a predetermined distance, and the road width between adjacent road center point candidates is 23. A centerline candidate is created by connecting road center point candidates under the condition that the value does not change more than a predetermined value times and the angle of refraction of the centerline is less than a predetermined value. Automatic generation device of road network information. 25. The center line determining means has a length of each of the center line candidates that is close to the length of the road line segment, a short distance to the road line segment, and a road width of the road line segment. 23. The automatic road network information generating apparatus according to claim 22, wherein one center line having a width close to the road width is selected. 26. The detailed centerline information generation means, for road edge information from which the centerline is extracted, a road surface certification processing means for certifying the road surface side based on the information of the center line, and the road surface certification. For road edge information that has not been certified, uncertified road edge information road surface certification means that certifies the road surface side based on the road surface side information that was certified by the road surface certification processing means, and uncertified road edge information road surface From the road edge information that the road surface side has been newly approved by the approval means, the road edge line segment approval processing means for authenticating the pair of road edge line segments forming the road surface and the road edge line segment approval processing means 19. The automatic road network information according to claim 18, further comprising: a center line extracting unit that obtains a center line based on a pair of road edge line segments certified in. Forming apparatus. 27. The road surface recognition processing means includes road edge information and center line information from a road edge information storage means that stores all road edge information and a center line information storage means that stores center line information, respectively. 27. The road network information automatic generation device according to claim 26, wherein the road edge information from which the center line is extracted is derived by inputting and correlating the information of 1. 28. The uncertified road edge information road surface certifying means extracts uncertified road edge information extracting means for extracting road edge information for which the road surface is not certified, and a road for which the extracted road surface is not certified. The road network information automatic generation device according to claim 26, further comprising: a road surface recognizing unit that authenticates the road surface side with respect to edge information. 29. The road edge information extraction means for extracting unrecognized road edge information extracts road edge information for which a road surface adjacent to a road edge information for which a road surface has been admitted is not approved. Automatic generation device of road network information. 30. The unlicensed road edge information extracting means extracts road edge information in which a road surface continuous in the vicinity of road edge information in which a road surface is certified is not certified. A device for automatically generating road network information described in 1. 31. The road surface certifying means, when certifying the road surface side for road edge information for which the road surface is not certified, makes sure that the road edge information is the same as the road edge information for which the road surface is certified. 29. The road network information automatic generation device according to claim 28, wherein a connecting direction of road edge information whose road surface is not certified is determined. 32. The centerline extracting means further comprises information on the entire centerline in addition to information on the newly created centerline, in addition to information on the already created centerline. The automatic generation device for road network information according to claim 26. 33. The center line extracting means connects the midpoints of the end points of both ends of the overlapping portion of the pair of road edge line segments certified by the pair of road edge line segment certifying means to the center line. 27. The automatic generation device for road network information according to claim 26, wherein: 34. The complete centerline information generating means connects a means for determining a dead end of the end points of the centerline obtained by the detailed centerline information generating means and a line segment between the end points of the two centerlines. Means, means for obtaining an intersection of intersecting center lines, means for connecting a center line intersecting with the extension line of the center line to the extended center line, and intersection of the extension lines of two center lines 19. The automatic generation apparatus for road network information according to claim 18, comprising: means for connecting the center lines with each other; and means for obtaining an end point node for the information of all the center lines. 35. An eleventh step of converting small-scale road network information and large-scale road edge information into the same coordinates, and selecting one road line segment from the small-scale road network information, and selecting the road line segment. A thirteenth step of performing a process of extracting a center line in the large-scale road edge information corresponding to a line segment for all road line segments, and information added to the road network information is added to the center line The 14th to be inherited as information
A method for automatically generating road network information, comprising: 36. A twelfth step of, after the eleventh step, storing a management number and attribute information for each of the line segments forming the small scale road network information and the large scale road edge information. The method for automatically generating road network information according to claim 35, comprising: 37. In each of the thirteenth step and the fourteenth step, each time a line segment to be processed is processed, its control number is stored and its attribute information is obtained and stored. 36. The method for automatically generating road network information according to claim 35. 38. In the thirteenth step, the selected road line segment is within a predetermined distance from the selected road line segment among road edge line segments of the road edge information, and the selected road line segment is selected. Step 131 for obtaining all road edge line segments having a predetermined parallelism with the road line segment, and horizontal or vertical scanning lines and the road for all road edge line segments obtained in the 131st step A center is formed by connecting the road center point candidates obtained in the 132nd step with the intersection point with the edge line segment and connecting the obtained middle points between the plurality of intersections as road center point candidates. The 133rd step of generating a line candidate, and the candidate whose length, distance and road width are closest to the selected road line segment is selected from the center line candidates obtained in the 133rd step, and is selected. Sen Automatic method of generating road network information according to claim 35, characterized in that it comprises a first 134 step of determining a center line line candidates for the selected road segments, a. 39. Coordinate conversion means for converting small-scale road network information and large-scale road edge information into the same coordinates, and a road segment is selected one by one from the small-scale road network information, and the road is selected. Corresponding center line extraction means for performing the process of extracting the center line in the road edge information of the large scale corresponding to the line portion, and the information added to the road network information to the center line And an additional information inheriting unit that inherits the information as the specified information. 40. A 21st step of certifying a road surface side for road edge information, and a 21st step of road edge information for which a road surface is not certified.
The 22nd process that certifies the road surface side based on the road edge information whose road surface side has been certified in the process, and the road edge information that is newly certified in the 22nd process. Of the road network information, including a 23rd step of certifying the road edge line segment of the above, and a 24th step of obtaining the center line based on the pair of road edge line segments certified in the 23rd step. Automatic generation method. 41. In the twenty-first step, road edge information and center line information are respectively selected from road edge information storage means in which all road edge information is stored and center line information storage means in which center line information is stored. 41. The automatic generation method of road network information according to claim 40, characterized in that the road surface side is identified with respect to road edge information having corresponding center line information. 42. In the 21st step, the road edge information is displayed on the display means, and the operator instructs the road surface side via the instruction means with respect to the road edge information displayed on the display means. The road network information automatic generation method according to claim 40. 43. In the 22nd step, the 22nd step of extracting road edge information of which road surface is not certified.
The automatic generation method of road network information according to claim 40, comprising: 1 step; and 222 step of certifying the road surface side for road edge information in which the extracted road surface is not certified. 44. In the twenty-fourth step, further, the information of the newly created center line is added to the information of the already created center line to configure the information of the entire center line. Item 40. A method for automatically generating road network information according to Item 40. 45. In the twenty-fourth step, the center line is obtained by connecting midpoints of end points of both ends of the overlapping portion of the road edge line pairs of the pair recognized in the twenty-third step. Claim 4
A method for automatically generating road network information described in 0. 46. Regarding road edge information for which a center line has been extracted, road surface authorization processing means for authorizing the road surface side based on the information of the center line, and road edge information for which the road surface is not authorized, Unauthorized road edge information Road surface certification means that certifies the road surface side based on the road edge information that the road surface side is certified by the surface recognition processing means, and new road surface side is certified by the uncertified road edge information Road surface certification method From the road edge information obtained, a pair of road edge line certifying means for certifying a pair of road edge line segments forming a road surface, and a pair of road ridge lines certified by the road edge line segment recognizing processing means An automatic road network information generating device, comprising: a center line extracting means for obtaining the center line based on the minutes.