JP4365606B2 - Joint display device for map data or aerial photo data - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a method and apparatus for joining and displaying a road ledger drawing created by a public institution.
[0002]
[Prior art]
Traditionally, public institutions have made accurate surveys, and road ledger maps, which are maps of roads and the like accurately, have been used for road management and other purposes. Such a road ledger attached map is a map on which roads are described, but is divided into predetermined ranges. Therefore, for example, if a map is to be displayed on a display screen of a computer along a certain road, it is necessary to read the corresponding divided portion of the road ledger map with a scanner or the like, and display the combined raster data. As a method for joining the divided parts of the road ledger attached map as raster data, for example, as described in Patent Document 1 shown below, absolute coordinates are assigned to points on a map, and based on the absolute coordinates. An example of joining the divided parts is as follows.
[0003]
FIG. 5 shows an explanatory diagram when the map data to which the absolute coordinates are assigned are joined. In FIG. 5, the absolute coordinates are assigned to each map data 100 divided for each predetermined range as described above. Based on the absolute coordinates, if the map data 100 are joined while being appropriately rotated, a joined map without a break on the road 102 or the like can be obtained between the maps.
[0004]
Note that the above method is not limited to road maps, but can be applied to aerial photograph data as well.
[0005]
[Patent Document 1]
JP 2001-351113 A
[0006]
[Problems to be solved by the invention]
However, in the above prior art, it is necessary to assign absolute coordinates to each divided map data which is raster data, and there is a problem that the process for that is complicated. For this reason, it was difficult to apply to the map of the road ledger, which was originally a paper-based map.
[0007]
The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a joint display method and apparatus for map data or aerial photograph data that can display map data and the like in a simple manner and without any breaks. It is in.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a joint diagram in which a plurality of map data or aerial photograph data in which roads or rivers are described are joined seamlessly, and each of the joint diagrams is at least one end side thereof. The map data or the aerial photograph data to be arranged are stored in duplicate, and the plurality of stored joint diagrams are sequentially displayed by moving a predetermined display area set on the joint diagram. A method for joining and displaying map data or aerial photograph data, wherein the map data or aerial photograph data arranged on the end side of the joint map is set in the display area and moves together with the display area. A limit point is set, which is a limit at which a predetermined display reference point approaches the end of the joint diagram, and when the display reference point reaches the limit point, the map data or navigation And characterized in that the corresponding jump the display reference point up to the limit point of the other bonding pattern comprising map data or aerial photograph data that overlaps with the picture data.
[0009]
According to the above configuration, the joint diagram seamlessly joins multiple map data or aerial photograph data, and when the display reference point reaches the limit point, it jumps to the next joint diagram. Map breaks are not displayed. For this reason, a map can be displayed without a break.
[0010]
Further, in the map data or aerial photograph data joint display method, a virtual center line is set along the road or river on the joint map, and the center line is a distance from a predetermined start point. Data is associated, and the limit point is set to a predetermined distance point on the center line.
[0011]
According to the above configuration, the display management can be facilitated by the center line associated with the distance data from the predetermined start point.
[0012]
Further, in the map data or aerial photograph data joint display method, the displayed joint map is switched when the display reference point passes the limit point for a predetermined distance.
[0013]
According to the above configuration, when the display reference point passes the limit point for a predetermined distance, the displayed joint diagram is switched, so that the fixed distance display reference point moves whether or not the display reference point has reached the limit point. It is sufficient to make a determination during the process, and the determination of the limit point can be facilitated.
[0014]
In the method for joining and displaying map data or aerial photograph data, the joined view is composed of three pieces of map data or aerial photograph data.
[0015]
According to the above configuration, since the joint diagram is composed of three pieces of map data or aerial photograph data, it can be easily created and the number of overlapping map data or aerial photograph data can be reduced.
[0016]
Further, it is a joint display device for map data or aerial photo data, and is a joint diagram in which a plurality of map data or aerial photo data describing roads or rivers are joined seamlessly, each of the joint diagrams, A storage unit for storing overlapping map data or aerial photograph data arranged on at least one end thereof, and a plurality of the stored joint diagrams, a predetermined display area set on the joint diagram It is defined in the joint diagram display unit that sequentially displays by moving and the map data or aerial photograph data arranged on the end side of the joint diagram, and is set in the display region and moves together with the display region A limit point determination unit that determines a limit point at which a predetermined display reference point approaches the end of the joint diagram, and the limit point determination unit determines that the display reference point is the limit point. A reference point jump unit that jumps the display reference point to a corresponding limit point of another joint diagram having map data or aerial photograph data that overlaps the map data or aerial photograph data when it is determined that the point has been reached. And. Preferably, a virtual center line is set along a road or a river on the joint map along the connection map, distance data from a predetermined start point is associated with the center line, and the limit point is set on the center line. Setting means for setting a predetermined distance point. Further, preferably, the limit point determination unit causes the reference point jump unit to jump the display reference point when the display reference point passes the limit point by a predetermined distance.
[0017]
According to each said structure, the joining display apparatus of the map data or aerial photograph data which can display a some joining drawing simply and without a break | interruption is realizable.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.
[0019]
FIG. 1 shows a block diagram of a configuration of a map data or aerial photograph data joining display device according to the present invention. In FIG. 1, an input unit 10 is composed of an input device such as a scanner, a keyboard, a mouse, a disk device, etc., and is a joint diagram in which a plurality of map data or aerial photograph data describing roads or rivers are joined seamlessly. Can be entered.
[0020]
2A, 2B, and 2C show examples of the above-described joint diagrams. 2 (a), 2 (b), and 2 (c), a plurality of map data or aerial photograph data (hereinafter referred to as map data, etc.) 14 is seamless, that is, roads, rivers, and other items described on a map are displayed. The pieces of map data and the like 14 are joined in a state where they are not shifted at the joining portion of the map data 14 or become blank with no map image. Here, the map data 14 includes road ledger maps, aerial photographs, and the like. The respective map data 14 and the like are joined at the joint 16 without a break, thereby forming a joint diagram 18. In the junction part 16, each map data etc. 14 may overlap partially, and the edge | side and edge | side may be joined without overlapping. This joining work may be physically joined manually by a person, or may be joined as digital data while being taken into a personal computer by a scanner or the like and displayed on a display.
[0021]
In the case of FIG. 2A, three pieces of map data 14 and the like are joined to form a joined diagram 18. That is, as a set of map data etc. 14, one joint figure 18 is constituted by three pieces of a, b, c, and then another joint figure 18 is constituted by a set b, c, d of map data etc. 14. Yes. In this way, if the joint diagram 18 is constituted by three pieces of map data 14 or the like, the number of joints can be reduced, and the joint diagram 18 can be easily created. Thereafter, similarly, the joint diagram 18 is constructed while overlapping the two map data and the like 14 arranged on at least one end thereof. The joint diagram 18 thus configured is read into the joint display device by the scanner constituting the input unit 10 of FIG. 1 when physically joined manually. Further, the joining diagram 18 joined as digital data is input to the joining display device by an appropriate method such as through the disk device of the input unit 10. Further, the bonding display device itself may have the function of creating the bonding diagram 18. The joint drawing 18 thus captured is stored as map raster data by the control unit 20 in the storage unit 22 corresponding to the storage unit of the present invention.
[0022]
In the joint diagram 18, a virtual center line 24 of the road or river is set along a predetermined road or river. The setting of the center line 24 is performed by the control unit 20 defining a table storing various data related to a predetermined position on the road or river. This table is stored in the storage unit 22. Each set center line 24 is given a center line ID, and it is distinguished which road or river is set in which joint drawing 18. This center line ID is also stored in the table.
[0023]
The center line 24 is associated with distance data from a predetermined starting point such as a starting point of a road by the control unit 20 when the center line 24 is taken into the joining display device. At this time, the map scale necessary for displaying the map data 14 on the display unit 26 of the joint display device is also related to the joint map 18 by the control unit 20. These associations are performed by storing the distance data and the map scale in the table for setting the center line 24. These distance data, scale, and the like are also input by the operator from the input unit 10 and stored in the table by the control unit 20. Thereafter, each joint drawing 18 is recognized as one independent map data. In addition, since each center map 24 is associated with distance data from a predetermined starting point in each joint diagram 18, the position on the road or river on the joint diagram 18 is grasped as the distance data of the center line 24. Is done. The road ledger map, etc. is used for management of roads, rivers, etc., so it is convenient to set the center line 24 on the map and manage the points on the map according to the purpose of use. It is.
[0024]
In FIG. 2A, the center line 24 is set across the three pieces of map data 14 and the like, but does not reach the end of the joint diagram 18. This is because, as will be described later, limit points 28 for defining the range of the map image displayed by one joint map 18 are set at both ends of the center line 24. The limit point 28 is set at the same point in each of the joint diagrams 18 having the overlapping map data 14 and the like. For example, in the example of FIG. 2A, the joint 16 of b and c of the map data 14 exists in the upper diagram and the lower diagram, respectively. The limit point 28-1 and the limit point 28-2 set in these joint portions 16 are the same point. The limit points 28-1 and 28-2, which are the same points, correspond to the corresponding limit points of the present invention. Further, the limit point 28 is set as a point having a predetermined distance from the start point on the center line 24. Setting of the limit point 28 is also performed by the control unit 20. As described above, the control unit 20 for setting the center line 24, associating the distance data from the predetermined start point to the center line 24, and setting the limit point 28 corresponds to the setting means according to the present invention.
[0025]
In the example shown in FIG. 2B, the point that three pieces of map data 14 are joined is the same as in FIG. 2A, but the map data 14 that overlaps at least one end side is the same. The difference is that it is one. In FIG. 2B, the map data 14 indicated by c is duplicated. As a result, the number of map data and the like 14 that overlap between the respective joint diagrams 18 is reduced, the range of the center line 24 is increased, and the duplication rate of data stored in the storage unit 22 is reduced. The use efficiency of the area can be improved. Further, in FIG. 2C, the joined map 18 is constituted by two pieces of map data etc. 14, and the number of map data etc. 14 to be joined is further reduced. Since the number of 18 pixels can be reduced, handling such as taking in and out of the storage unit 22 becomes easy. Note that the number of map data and the like 14 constituting the joint diagram 18 is not particularly limited and can be appropriately determined according to the purpose of use of the joint diagram.
[0026]
After the joint drawing 18 described above is stored in the storage unit 22, the control unit 20 acquires data regarding the joint drawing 18 including the current position as a point on the center line 24 from the storage unit 22. Let This initial position is set in advance by an appropriate method such as default setting. Next, the control unit 20 causes the display calculation unit 32 to calculate a map area on the joint diagram 18 displayed on the display screen of the display unit 26, that is, a display area, with the current position as the center. For this calculation, data such as the scale of the map and the size of the display screen are used. The area of the map on the joint diagram 18 displayed on the display screen corresponds to the predetermined display area of the present invention. A raster image corresponding to the calculated map area is sent from the data acquisition unit 30 to the control unit 20 and displayed on the display unit 26 under the control of the control unit 20.
[0027]
On the display screen of the display unit 26 described above, a raster image of a map centered on the current position is displayed as a display area. Since this current position corresponds to the display reference point according to the present invention, the display reference is hereinafter referred to. It is called a point. FIG. 3 shows the relationship between the above-described joint diagram, display area, and display reference point. In FIG. 3, the display reference point 38 is on the center line 24 set on the joint drawing 18, and the display area 40 is set around this. As described above, the raster image of the map in the display area 40 is displayed on the display screen of the display unit 26. Note that the display reference point 38 is a virtual point for controlling the screen display, and may or may not be displayed on the display screen.
[0028]
The display reference point 38 is moved on the center line 24 together with the display area 40 by the reference point moving unit 34. The movement of the display reference point 38 may be instructed by the operator from the input unit 10 on the distance data on the center line 24, or may be controlled by the control unit 20 with software created in advance. When the display reference point 38 moves on the center line 24, the display calculation unit 32 recalculates the area of the map on the joint diagram 18 displayed on the display screen of the display unit 26 around the moved display reference point 38. . A raster image corresponding to the calculated area is sent from the data acquisition unit 30 to the control unit 20 and displayed on the display unit 26. In this way, when the display reference point 38 is moved by the reference point moving unit 34, the predetermined display area 40 set on the joint drawing 18 is also moved, so that the raster image of the map is scrolled and sequentially displayed. I can go. Here, the control unit 20, the display unit 26, the data acquisition unit 30, the display calculation unit 32, and the reference point moving unit 34 constitute a junction diagram display unit according to the present invention.
[0029]
When the display reference point 38 is moved on the center line 24, the limit point 28 shown in FIGS. 2 and 3 is reached, and the positions of the limit point 28 and the display reference point 38 coincide. The limit point determination unit 36 determines whether or not the display reference point 38 has reached the limit point 28. This determination is made based on whether or not the display reference point 38 coincides with a point on the center line 24 of the distance corresponding to the limit point 28.
[0030]
The limit point 28 is a limit at which the display reference point 38 is close to the end of the map data etc. 14 arranged on the end side of the joint FIG. 18, and the display reference point is the end of the map data etc. 14 beyond this point. , It is defined as a point where a portion where map data does not exist may occur in the display area 40 with the display reference point 38 as the center. That is, when the display reference point 38 moves to the end side of the joint diagram 18 beyond the limit point 28, a portion that protrudes from the map is displayed on the display screen of the display unit 26. In order to avoid such inconvenience, when the limit point determination unit 36 determines that the display reference point 38 has reached the limit point 28, the control unit 20 sends the current joint diagram 18 to the data acquisition unit 30. Data relating to another joint map 18 having map data 14 and the like overlapping with the map data 14 to be configured is acquired. In this case, it is preferable to associate each junction diagram 18 with data indicating which other junction diagram 18 having a portion overlapping with itself in advance. In the reference point moving unit 34, the limit point 28 corresponding to the limit point 28 corresponding to the other joint drawing 18 acquired by the data acquisition unit 30, that is, the display reference point 38 is the same point as the limit point reached on the previous joint drawing 18. The display reference point 38 is moved (jumped) until. The reference point moving unit 34 in this case corresponds to the reference point jump unit of the present invention. The display calculation unit 32 calculates the area of the map displayed on the display unit 26, that is, the display area 40, with the display reference point 38 moved to another joint figure 18 as the center, and the map area calculated by the control unit 20 The raster image corresponding to is acquired from the data acquisition unit 30 and displayed on the display unit 26. As a result, even if the display reference point jumps from the limit point 28 in one joint diagram 18 to the limit point 28 in another joint diagram 18, there is no break in the map image displayed on the display unit 26. Therefore, even if the map image displayed on the display unit 26 is appropriately scrolled, a continuous map image can be displayed. Thereby, it is possible to realize a method and apparatus for joining and displaying map data or aerial photograph data, which is convenient when used for road management and the like.
[0031]
FIG. 4 shows an operation flow of the joint display device for map data or aerial photograph data shown in FIG. In FIG. 4, data relating to the joint diagram 18 including the current position (display reference point 38) set as an initial value is acquired by the data acquisition unit 30 from the data of the joint diagram 18 stored in advance in the storage unit 22 ( S1).
[0032]
Next, the display calculation unit 32 calculates the size of the map area on the joint diagram 18 displayed on the display window (display screen) of the display unit 26 around the display reference point 38 (S2).
[0033]
The control unit 20 acquires a raster image of the map that matches the map area calculated in S2, that is, the display area 40 (S3), and displays the raster image on the display unit 26 (S4).
[0034]
From the state as described above, the reference point moving unit 34 moves the display reference point 38 along the center line 24. This movement may be based on either an operator instruction from the input unit 10 or an instruction from the control unit 20 based on predetermined software. When the display reference point 38 moves, the control unit 20, the data acquisition unit 30, and the display calculation unit 32, as described above, displays a map image centered on the display reference point 38 after the movement as the display region 40. (S5).
[0035]
While the display reference point 38 is moving, the limit point determination unit 36 determines whether or not the display reference point 38 has reached the limit point 28 shown in FIG. 2 (S6). The determination that the display reference point 38 has reached the limit point 28 may be made while the display reference point 38 passes the limit point 28 for a predetermined distance. According to this, since it is only necessary to determine arrival while the display reference point 38 moves by a certain distance, not when the display reference point 38 coincides with the limit point 28, determination of the limit point can be facilitated. The predetermined distance in this case is determined so that a portion that protrudes from the map is not displayed on the display screen of the display unit 26.
[0036]
When the display reference point 38 has not reached the limit point 28, the operation from S2 is repeated, and the map image is scrolled.
[0037]
On the other hand, when the limit point determination unit 36 determines that the display reference point 38 has reached the limit point 28, the display reference point 38 is displayed up to the corresponding limit point 28 on the other joint diagram 18 including the limit point 28 of the same point. Jump (S7).
[0038]
Thereafter, returning to the operation from S1, a map image is displayed on the display unit 26 based on the display reference point 38 of the jump destination. By repeating the above operation, it is possible to realize a joint display method of map data or aerial photograph data that can scroll the map image while moving the display reference point 38.
[0039]
【The invention's effect】
As described above, according to the present invention, the joint diagram seamlessly joins a plurality of map data or aerial photograph data, and jumps to the next joint diagram when the display reference point reaches the limit point. Therefore, map breaks are not displayed even between joint drawings. For this reason, map data etc. can be displayed by a simple method and without a break.
[0040]
In addition, since a center line associated with distance data from a predetermined start point is used, display management of maps, aerial photographs, and the like can be facilitated.
[0041]
In addition, if the display reference point passes the limit point for a predetermined distance and the displayed joint diagram is switched, the fixed distance display reference point moves whether or not the display reference point has reached the limit point. It is sufficient to make a determination during the process, and the determination of the limit point can be facilitated.
[0042]
Further, since the joint diagram is composed of three pieces of map data or aerial photograph data, it is easy to create and the number of overlapping map data or aerial photograph data can be reduced.
[0043]
In addition, according to the present invention, it is possible to realize a map data or aerial photograph data joint display device that can display a plurality of joint diagrams in a simple manner and without breaks.
[Brief description of the drawings]
FIG. 1 is a block diagram of a configuration of a joint display device for map data or aerial photograph data according to the present invention.
FIG. 2 is a diagram illustrating an example of a bonding diagram.
FIG. 3 is an explanatory diagram of a relationship between a bonding diagram, a display area, and a display reference point.
4 is a flowchart of the operation of the map data or aerial photograph data joint display device shown in FIG. 1 according to the present invention.
FIG. 5 is an explanatory diagram when joining map data to which absolute coordinates are assigned.
[Explanation of symbols]
10 input sections, 14 map data, 16 joint sections, 18 joint diagrams,
20 control unit, 22 storage unit, 24 center line, 26 display unit, 28 limit point,
30 data acquisition unit, 32 display calculation unit, 34 reference point moving unit, 36 limit point determination unit, 38 display reference point, 40 display area.

Claims (3)

A plurality of map data or aerial photographs data described road or river, a junction view road or river are joined at a break gastric condition, each of said junction view, the plurality of map data or air When joining the photo data, a storage unit for storing a joint diagram in which map data or aerial photo data arranged at least at one end thereof is duplicated,
A plurality of the stored joint diagrams, a joint diagram display unit that sequentially displays a predetermined display area set on the joint diagram; and
The set during the display area, the predetermined display reference point the virtually set the center line along the road or river moves with the display area, a limit to approach the end of the center line of the joining Figure A limit point determination unit that determines whether or not a limit point is reached ,
When the limit point determination unit determines that the display reference point has reached the limit point, it corresponds to another joint diagram having map data or aerial photograph data that overlaps the map data or aerial photograph data. A reference point jump unit for jumping the display reference point to a limit point;
An apparatus for joining and displaying map data or aerial photo data. The map data or aerial photograph data joint display device according to claim 1 , wherein distance data from a predetermined start point is associated with the center line, and the limit point is set to a predetermined distance point on the center line. An apparatus for joining and displaying map data or aerial photo data. 3. The joint display device for map data or aerial photograph data according to claim 1 or 2 , wherein the limit point determination unit is configured such that the display reference point is the limit while the display reference point passes the limit point by a predetermined distance. A joint display device for map data or aerial photograph data, characterized by determining that a point has been reached .

Images