JP2004101780A - Device and method for processing positional coordinate correction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for positional coordinate correction processing for solving the problem that, when electronic maps are superposed and displayed, the maps cannot be correctly superposed due to positional deviations caused by the difference in the reduction scales, distortions or the like, and attaining efficient positional correction based on a reference position. <P>SOLUTION: In the device for processing positional coordinate correction, the positions of a reference electronic map and of an electronic map to be corrected corresponding to each other are specified. From the coordinate of each position, affine transformation is performed so as to make the electronic map to be corrected coincide with the position of the reference electronic map. Here, a feature point code is added to the position to be specified. By inputting and specifying the feature point code, the position can be specified. Also, when electronic maps are superposed and displayed, the problem that the maps cannot be correctly superposed due to displacement caused by the difference in the reduction scales, distortions or the like can be corrected by carrying out data processing. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a map position coordinate correction processing apparatus and method for use in a geographic information system for managing and displaying digitalized topographic maps and facility maps.
[0002]
[Prior art]
Conventionally, topographic maps and facility maps, which are the source of digitized data handled by geographic information systems, have a wide variety of sizes, scales, and shapes due to differences in the purpose of use, differences in creators at the time of creation, and differences in time of creation. have. Therefore, when the image is read by an image scanner and digitized, when the maps are superimposed on each other and displayed, the positions do not match and a displacement occurs. Depending on the original map, there may be a partial displacement, an overall displacement, or a locally disparate displacement. In order to correct the positional deviation, it is necessary to visually extract the individual mismatch points and match them with any of the reference points.
[0003]
Further, when the reference position is not determined, an error that the absolute position, that is, latitude and longitude, does not match cannot be avoided.
[0004]
[Problems to be solved by the invention]
In the prior art, topographic maps having different scales and the like have different required positional accuracy. Therefore, when they are superimposed, there is no positional error and almost no overlap is expected. In addition, since there is no regularity of the positional deviation, the correction is a manual operation, and the position correction is not often performed when no special use is required.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a position coordinate correction processing apparatus and method which can efficiently perform position correction and can perform correction based on a reference position in view of the problems of the related art.
[0006]
[Means for Solving the Problems]
The present invention provides a first means for setting different feature point codes for a plurality of position correspondences on a reference map,
Second means for setting the same feature point code at the same position on the correction target map having a different scale or the like corresponding to the plurality of positions on the reference map;
Third means for performing correction so that the position coordinates of at least two different feature point codes on the correction target map match the corresponding position coordinates of the same identical feature point code on the reference map;
A map position coordinate correction processing device including
[0007]
Further, the present invention provides a map position coordinate correction processing device that eliminates positional displacement distortion between maps such as digitized topographic maps and facility maps.
First means for registering different feature point codes for a plurality of position correspondences on a reference map;
Second means for displaying a correction target map, and displaying the same feature point code assigned to the same position of the feature point code of the reference map on the display map;
A third correction is performed such that the position coordinates of at least two different feature point codes specified on the correction target map being displayed match the position coordinates of the corresponding same feature point code on the reference map. Means,
A map position coordinate correction processing device including
[0008]
Further, according to the present invention, the third means performs the correction between the corresponding position coordinates one after another according to the update of at least two different feature point codes which are successively allocated and displayed by the second means.
Further, according to the present invention, the position on the map set by the feature point code is an object whose position such as a block, a road, an intersection, or a target can be specified.
In the present invention, the position coordinates in the third means are coordinates represented by latitude and longitude.
[0009]
The present invention further provides a paid map position coordinate processing device connected to a communication line and capable of superimposing a plurality of maps, such as a digitized topographic map and a facility map, without distorting positional displacements, and a communication line. A map position coordinate correction processing method for performing map position coordinate correction processing with a user terminal connected to
The user terminal sends the correction target map to the map position coordinate processing device via the communication line,
The map coordinate processing device sets a plurality of feature point codes corresponding to a plurality of positions on the registered reference map at the same position on the correction target map, and sets at least two different feature point codes specified on the correction target map. The position coordinates of the feature point code are corrected so as to match the corresponding positions of the same feature point code on the reference map, and the corrected map to be corrected is sent to the user terminal,
On the user terminal side, this was received and stored.
A map position coordinate correction processing method using a communication line, which is characterized by the above, is disclosed.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a main part of a position coordinate correction processing device according to an embodiment of the present invention, and FIG. 2 is an overall configuration diagram of the position coordinate correction processing device. 1 and 2, a position coordinate correction processing device includes, for example, a CPU (central processing unit) 10, a file device 11, a main memory 12, a drawing input device 13, a display (display device) 14, It comprises a keyboard 15, a mouse 16, a data input device 17, and a drawing output device 18. Each unit is connected via a data transmission path.
[0011]
The operation input processing 21 among the units of the CPU 10 performs input processing from the keyboard 15 and the mouse 16. The drawing search processing unit 22 updates the figure of the drawing file 110 and extracts the figure information according to the input from the operation input processing unit 21. Similarly, the attribute search processing unit 22 updates and extracts the attribute information file 111.
[0012]
In FIGS. 1 and 2, the file device 11 stores, in the form of a set of a plurality of figures, graphic information relating to facility drawings such as a water and gas system diagram, electricity and telephone wiring system diagrams, and attribute information relating to the figures. Are stored as facility drawing data. Among the facility drawing data, figure data such as a topographic map and a pipeline map are stored in the drawing file 110 as figure information. Attribute data represented by characters and numerical values such as a town name, a pipe diameter, and a pipe type related to the graphic is stored in the attribute file 111 as attribute information.
[0013]
The input of the graphic data is performed, for example, by scanning a drawing written on paper at regular intervals by the drawing input device 13, reading the read data, shading the read data in accordance with the shading, and converting the data in which the shading is performed. The data is coded as digital image data, and the coded data is input from the drawing input device 13.
[0014]
FIG. 3 is an explanatory diagram showing the relationship between the drawing configuration of the file device and the graphic coordinates. In the case of a facility drawing, as shown in FIG. 3A, the drawing is composed of a plurality of drawings, and graphic data for each drawing is divided into a plurality of drawing data files # 1 to #n and stored in the drawing file 110. Further, as shown in FIG. 3B, the graphic data is generated according to position data based on a rectangular coordinate system, and the size of each graphic is determined by its length in the X-axis and Y-axis directions according to the drawing size. X and Y.
[0015]
As shown in the hierarchical structure of the graphic data in FIG. 4, the data structure is shown in (b) to (d) separated into three levels of road, house frame, and sewer. By superimposing the data of each layer among these data as necessary, the graphic data as shown in FIG.
[0016]
On the other hand, the attribute data constituting the attribute information is input from the keyboard 15 or from a data input device 17 which can collectively input data on a floppy disk or the like. As shown in FIG. 1, each attribute data is stored in the attribute file 112 in association with each graphic data. The data input device 17 is also used when storing facility drawing data, such as a topographic map and a pipeline map, which have already been digitized, as a graphic data file in the drawing file 110.
[0017]
Of the drawing data and attribute data stored in the file device 11, the data associated with the processing of the CPU 10, that is, data being processed by the CPU 10, programs and index diagrams for executing processing such as search and editing of drawing data. Data is stored in the main memory 12.
[0018]
In order to manage the facility drawings stored in the file device 11, the CPU 10 performs various types of arithmetic processing based on input information from the keyboard 15 and the mouse 16 to search for data in the file device 11, and retrieves the searched data. Is displayed on the screen of the display (display means) 14 on the basis of. The drawing data is edited by the display editing processing unit 25 in accordance with the effective display coordinates that are the display area of the display 14. Then, the designated facility drawing is displayed on the screen of the display 14 based on the edited data. By displaying the image related to the facility drawing on the screen, the operator can know the contents of the target drawing.
[0019]
Next, a position coordinate correction method will be described. To correct the position error, first, reference coordinates are required. Therefore, first, a reference coordinate point is determined in advance. For example, as shown in FIG. 5A, in the correction processing of the positional deviation of the road intersection in the topographical map, first, a plurality of positions P1 to P6 to be used for the deviation calculation are designated on the reference map 50. This position is, for example, a position determined and selected by a shift correction operator. The positions P1 to P6 are classified by different feature point codes CH1 to CH6 and registered in correspondence with the position coordinates. Similarly, after selecting and displaying an area including the positions P1 to P6 of the correction target map 51 in FIG. 5B, the same feature point codes CH1 to CH6 are assigned. This is performed manually by an operator, for example.
[0020]
The position coordinates of the feature point code are preferably indicated by latitude and longitude. Latitude and longitude are absolute coordinates, and the map position displayed on the screen is relative coordinates on the screen, and by associating these with the absolute coordinates of latitude and longitude, it becomes easier to manage. . Such coordinates by latitude and longitude are provided as a part of the map data for both the reference map and the correction target map, and the specified assignment of the same feature point on both maps can be mutually performed by specifying the coordinate value. .
[0021]
The reference topographic map is based on a map for which the correction of the drawing has been completed in advance, or a road ledger with a scale of about 1/500. This is because the one with higher absolute position accuracy is used as a reference. The map displacement needs to be converted according to the coordinate distortion. The method of determining the positional deviation of the correction target map having the image distortion from the reference map is as follows.
(1) When the scales are different, a method is used in which the difference between the coordinates of several points on the reference map and the coordinates of several points on the correction target map is determined to determine the degree of the scale. For example, the difference between the scale on the screen from P1 on the reference map to P2 on the screen and the distance on the screen from P1 on the correction target map to P2 is determined. Further, when the position is simply shifted up, down, left, and right (position is shifted), it can be understood that the distances match.
(2) In the case where the displacement is caused by rotation or entanglement between the rotation and the scale, for example, a method of determining the rotation or the scale is required instead of the method as described in (1) above. For example, the degree of rotation or scale, which is the degree of distortion, is determined by using four points on the screen of P1P2P3P4 as shown in FIGS. 5 (a) and 5 (b). As a specific example, tetrahedral shapes on the screen of P1P2P3P4 in FIGS. 5A and 5B are compared with each other.
(3) In an example in which the positional deviation occurs at many places on the map, feature points are set at many positions, and the positional deviation near each updated position is successively updated while updating the positions. judge.
[0022]
Such a displacement can be automatically determined, and a correction process thereof is performed, for example, to match a geometric map. A typical example is an affine transformation that can perform various linear transformations such as a movement process and a rotation process. The correction processing is performed using the affine transformation method selected according to the content of the shift.
For example, when correcting the position of the target topographic map, a closed area (figure) surrounded by the feature points P1P2P3P4 is set as the first block by affine transformation such as rotation and movement with respect to the four constituent points of the target topographic map. Affine transformation is performed between the feature point P1P2P3P4 and the associated reference map. Similarly, affine transformation is performed using the next closed region P1P4P6P5 as a second block. This is sequentially repeated to complete the affine transformation for all the target graphics. Incidentally, a non-linear conversion can also be adopted.
[0023]
The position coordinate correction processing unit 24 in FIG. 1 performs an affine transformation according to the position shift on the drawing file 110 or the digitized facility drawing data input from the data input device 17 in FIG. The coordinate correction processing is performed.
[0024]
FIG. 6 shows a procedure of a position coordinate correction processing method in the position coordinate correction processing unit 24. First, in step 101, the drawing search processing section 22 searches the drawing file 110 for a topographic map to be subjected to position correction and displays it. A position correction feature point code is allocated on the screen to a target object position at which the positional relationship between the block, the road intersection, the target, and the like of the displayed target topographic map can be clearly determined. This assignment is performed by an operator while viewing the display screen.
[0025]
In step 102, a topographic map to which position correction feature points have been allocated as a reference topographic map in advance is retrieved from the drawing file 110 and displayed. It is confirmed on the screen that there is a correspondence between the same position correction feature point codes of the target topographic map processed in step 101 during this display.
[0026]
In step 103, in order to correct the positional distortion in the position correction feature point code that matches the reference topographic map and the target topographic map, for example, the position correction feature point code of the target topographic map shown in FIG. A closed region having a point configuration is extracted, a state of positional distortion is detected between the closed region having a four-point configuration of the reference topographic map as shown in FIG. 5A, and the position distortion is eliminated. Correct the coordinates. The coordinate correction uses an affine transformation used for correcting positional distortion of graphic data. The conversion result is temporarily stored in the main memory 12.
[0027]
In step 104, a next closed area group having a four-point configuration determined by the position correction feature points of the target topographic map is extracted, and it is determined whether there is any corresponding closed area group. If all the closed region groups have not been completed, the process returns to step 103, and the positional distortion of the corresponding closed region group is corrected. The conversion result is also temporarily stored in the main memory 12 in the same manner. If all the closed area groups have been completed, the process proceeds to step 105.
[0028]
In step 105, the conversion result of the target topographic map stored in the main memory 12 is read out, the display edit processing unit 25 superimposes the reference topographic map on the target topographic map, and displays the result on the drawing display unit 26. The conversion result in the main memory 12 is also stored and saved in the corresponding drawing file 110.
[0029]
Although the feature points and their codes are assigned on the correction target map in step 101, there is a method of executing step 101 after step 102. In this case, for example, the feature map and its code assignment are displayed on the display screen with the reference map for which registration is completed, and the map to be corrected is displayed on another screen. A position corresponding to the feature point position is selected and designated, the selected and designated position is set as a feature point on the correction target map, and the same code is added. This facilitates the assignment of the feature points on the correction target map.
[0030]
In each of the above examples, the same feature point code is assigned to the same position in the reference graphic and the correction target drawing, but may be different. However, mutual conversion is performed by preparing a table or the like indicating the mutual relationship between them.
[0031]
The position coordinate correction processing device described above can be used not only by a user alone but also as a system as shown in FIG.
[0032]
In FIG. 7, the user can use the position coordinate correction from the user terminal device 31 as needed without having the position coordinate correction processing device 35. The user terminal device 31 is connected to the communication network 32, and transmits a target topographic map whose position coordinates are to be corrected as needed to an operation system having a position coordinate correction processing device as a registration destination. The target topographic map data is received by the communication control device 33, and is sent to the position coordinate correction processing device 35 after the firewall 34 determines whether or not the user is a subscriber. The position coordinate correction processing device 35 has a reference topographic map in advance, performs position correction processing with the reference topographic map, and transmits the position correction processing to the corresponding user terminal device 31 via the communication control device 33 and the communication network 32. Is done. The user uses the position coordinate correction result. In addition, in response to a position coordinate correction processing request from the user, the fee processing device 36 charges a metered rate or a fixed rate according to the conversion processing amount.
The feature point code serving as a reference for position correction is obtained via the communication network 32 by inquiring the position coordinate correction processing device from the user terminal device 31. The operator assigns this feature point code to the corresponding position on the target topographic map for position coordinate correction.
[0033]
【The invention's effect】
As described above, according to the present invention, when topographic maps of different scales are superimposed, there is no displacement and superimposed display can be performed. In addition, by associating the reference point positions, an accurate topographic map latitude / longitude can be obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a position coordinate correction processing unit of a position coordinate correction processing device according to an embodiment of the present invention.
FIG. 2 is an overall configuration diagram of a position coordinate correction processing device according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram showing a relationship between a drawing configuration of a file device and graphic coordinates.
FIG. 4 is a diagram showing a hierarchical structure of graphic data.
FIG. 5 is a diagram showing the assignment of arbitrary feature point codes to topographic map feature points.
FIG. 6 is a flowchart showing a procedure of a position coordinate correction processing method according to one embodiment.
FIG. 7 is a configuration diagram of a position correction service system from a user terminal by a position coordinate correction processing device according to an embodiment of the present invention.
[Explanation of symbols]
10 CPU
11 file device 12 main memory 13 drawing input device 14 display 15 keyboard 16 mouse 17 data input device 18 drawing output device 21 operation input processing unit 22 drawing search processing unit 23 attribute search processing unit 24 position coordinate correction processing unit 25 display editing processing unit 26 screen display unit 27 operation icon unit 31 user terminal device 31 communication control device 32 communication network,
33 firewall 34 position coordinate correction processing device 35 fee processing device 110 drawing file 111 attribute data file 112 position correction parameter data file

Claims (7)

First means for setting different feature point codes for a plurality of position correspondences on a reference map;
Second means for setting the same feature point code at the same position on the correction target map having a different scale or the like corresponding to the plurality of positions on the reference map;
Third means for performing correction so that the position coordinates of at least two different feature point codes on the correction target map match the corresponding position coordinates of the same identical feature point code on the reference map;
Map position coordinate correction processing device comprising: In the map position coordinate correction processing device that eliminates the positional deviation distortion between maps such as digitized topographic maps and facility maps,
First means for registering different feature point codes for a plurality of position correspondences on a reference map;
Second means for displaying a correction target map, and displaying the same feature point code assigned to the same position of the feature point code of the reference map on the display map;
A third correction is performed such that the position coordinates of at least two different feature point codes specified on the correction target map being displayed match the position coordinates of the corresponding same feature point code on the reference map. Means,
Map position coordinate correction processing device comprising: 3. The method according to claim 1, wherein the third means corrects each of the corresponding position coordinates one after another in accordance with updating of at least two different feature point codes which are sequentially assigned and displayed by the second means. Map position coordinate correction processing device. 3. The map position coordinate correction processing device according to claim 1, wherein the position on the map set by the feature point code is an object whose position such as a block, a road, an intersection, or a target can be specified. 3. The map position coordinate correction processing device according to claim 1, wherein the position coordinates in the third means are coordinates represented by latitude and longitude. A first step of setting different feature point codes for a plurality of position correspondences on a reference map;
A second step of setting the same feature point code at the same position on the correction target map having a different scale or the like corresponding to the plurality of positions on the reference map;
A third step of performing correction so that the position coordinates of at least two different feature point codes on the correction target map match the corresponding position coordinates of the same identical feature point code on the reference map;
Map position coordinate correction processing method comprising: A chargeable map position coordinate processing device that is connected to a communication line and that can superimpose digital maps, such as topographic maps, facility maps, etc., while eliminating positional displacement among multiple maps, and use that is connected to the communication line A map position coordinate correction method for performing map position coordinate correction processing with a user terminal,
The user terminal sends the correction target map to the map position coordinate processing device via the communication line,
The map coordinate processing device sets a plurality of feature point codes corresponding to a plurality of positions on the registered reference map at the same position on the correction target map, and sets at least two different feature point codes specified on the correction target map. The position coordinates of the feature point code are corrected so as to match the corresponding positions of the same feature point code on the reference map, and the corrected map to be corrected is sent to the user terminal,
On the user terminal side, this was received and stored.
A map position coordinate correction processing method using a communication line.

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