JP2002182556A - Map data correction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a map data correction method which is capable of correcting the map images of vector maps without conversion of aerial photographs to ortho-image data and reducing a cost required for the correction of the vector maps. SOLUTION: In correcting the vector area map A6 for one block of the vector map 20, the vector area map A6 before the correction is extracted from the vector maps 20 and is superposed on photographic maps 22 and 23. When the vector image in the vector area map A6 is matched with the image of the photographic maps 22 and 23, the images corresponding to vector unit maps A6a to A6y of the vector area map A6 are segmented from the photographic maps 22 and 23 and model images R01 to R25 for correction are formed. The model images R01 to R25 for correction area superposed on the respective vector unit maps A6a to A6y of the vector maps 20 to be corrected and the vector images of the respective vector unit maps A6a to A6y are corrected in accordance with the images of the model images R01 to R25 for correction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map data correction method for correcting a vector map based on an aerial photograph taken from above, and more particularly, to a map image of a vector map without converting the aerial photograph into ortho image data. The present invention relates to a map data correction method capable of correcting a vector map and reducing the cost required for correcting the vector map.

[0002]

2. Description of the Related Art Conventionally, in creating a topographic map by aerial surveying, two photographed areas are photographed at two points separated by a predetermined distance at a predetermined altitude in the sky with the photographing target areas overlapping each other by 60%. By performing orthoimage conversion on an aerial photograph, orthoimage data obtained by stereoscopically viewing the aerial photograph is created. According to the ortho image data, it is possible to obtain image data of the photographing target area, which is obtained by photographing substantially the entire photographing target area from directly above, without distortion. For example,
In creating contour lines, using ortho image data,
Based on the elevation values of many points surveyed on the ground, contour lines are mapped by connecting points of the same elevation.

[0003] In recent years, a map database has been constructed in which map information is converted into data using a vector map composed of vector image data. In such a map database, for example, there is a map database in which roads, rivers, buildings, and the like in an urban area having a smaller difference in elevation than in a mountain area are represented by a vector map. In such an urban area, since a change such as a new construction or an extension or renovation of a building or a road is frequently performed, it is necessary to frequently correct the vector map for such a changed portion.

[0004]

However, such a vector map is corrected using the above-mentioned ortho image data. That is, the orthographic image data created from the aerial photograph is superimposed on the map image data of the vector map, the two image data are compared, and the map image data of the vector map is corrected based on the orthoimage data.
When creating orthoimage data from aerial photographs, dedicated equipment such as a dedicated scanner for reading images of aerial photographs and a dedicated program for converting images read by the scanner to orthoimage data is required. . Since such dedicated equipment is extremely expensive, there is a problem that the cost required for correcting the vector map is greatly increased if such dedicated equipment is introduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can correct a map image of a vector map without converting an aerial photograph into ortho image data. It is an object of the present invention to provide a map data correction method capable of reducing the cost required for the map data.

[0006]

In order to achieve this object, a map data correction method according to claim 1 converts a vector map having a map image composed of vector image data into an aerial photograph taken from above. A reading step of reading an aerial photograph by an image reading device to create a photographic map having a map image composed of image image data, and a section which is a map image of one section from a vector map. An extraction step of extracting a figure, and after superimposing the block diagram extracted by the extraction step on the photographic map created by the reading step, matching the map image of the photographic map with the map image of the block diagram, A reference map creation step of cutting a superimposed range with a block diagram from a photo map to create a reference map, and a reference map created by the reference map creation step correspond to the reference map. Superimposing on a section on the vector map, and modifying a map image in the section based on the reference map.

According to the map data correcting method of the present invention, in the reading step, an aerial photograph is read by the image reading device to create a photographic map, while in the extracting step, one of the vector maps is converted from the vector map. The block diagram is extracted. The extracted parcel map is superimposed on the photo map in the norm map creation process, the map image of the photo map is matched with the map image of the parcel map, and the superimposed range with the parcel map is cut out from the photo map to obtain the norm. A diagram is created. The reference map is superimposed on the corresponding section on the vector map by the correction process, and the map image in the section of the vector map is corrected based on the map image of the reference map. If such a reference map is created for the entire area of the vector map, the map image in the entire area of the vector map can be corrected based on the reference map by the correction process.

Here, a photographic map created from an aerial photograph has a distortion at a portion away from the center of the photographing range of the aerial photograph. Therefore, when a wide-range vector map is superimposed on the photo map, a part of the vector map in the map image matches the photo map image, but the other part in the vector map map image deviates from the photo map image. However, since the reference map serving as a reference for correcting the vector map is cut out from the photograph map based on the block diagram extracted from one block of the vector map, the area covered by the one block diagram is reduced. By doing so, the amount of deviation between the map image of the block diagram and the map image of the photographic map is reduced, and a reference map having a small deviation error with respect to the vector map is created. By correcting the map image of the vector map based on this reference map, the map image of the vector map is corrected within a small error range without converting the aerial photograph into orthoimage data.

According to a second aspect of the present invention, there is provided the map data correcting method according to the first aspect, wherein the aerial photograph includes a first aerial photograph obtained by photographing the target area from a first photographing point at a predetermined altitude. A second aerial photograph taken at a second photographing point at a predetermined distance from the first photographing point so as to overlap a part of the photographing range in which the first aerial photograph was photographed, The reading step includes a first reading step of reading the first aerial photograph by an image reading device to create a first photograph map, and a second reading step of reading the second aerial photograph by an image reading device to create a second photograph map. A reading step, wherein the reference map creating step superimposes a part of the section map extracted in the extracting step on the first photographic map, and then displays a map image of the first photographic map on the part of the section map. image A first creating step of creating a first reference map by cutting out a range that overlaps with a part of the block diagram from the first photographic map and matching the remaining portion of the block diagram extracted in the extracting step with the second map. After superimposing on the photographic map, the map image of the second photographic map is matched with the map image in the rest of the block diagram, and a range to be overlapped with the rest of the block diagram is cut out from the second photographic map to obtain a second standard. And a second creation step of creating a figure.

According to a third aspect of the present invention, there is provided the map data correcting method according to the first or second aspect,
The block diagram extracted in the extraction step is a composite block diagram in which a plurality of small block diagrams obtained by dividing the vector map into a plurality of small blocks, and the normative map creation step is a process in which the small block diagram in the composite block diagram is a photograph. When superimposed on the map, the map images of the plurality of small block maps and the map image of the photographic map determine a deviation amount, and the deviation amount is determined to be equal to or greater than a predetermined amount by the determination step. After the small parcel map is superimposed again on the photo map, the map image of the small parcel map is matched with the map image of the photo map, and the superimposed area with the small parcel map is cut out from the photo map to recreate the norm map. And a preparation step.

According to a fourth aspect of the present invention, there is provided a map data correcting method according to any one of the first to third aspects, wherein the partition map extracted in the extracting step includes converting the vector map into a plurality of small partitions. It is a composite block diagram in which a plurality of divided small block diagrams are gathered, and the reference map creating step, when the small block diagram in the composite block diagram is superimposed on a photographic map, a map image of the plurality of small block diagrams, and a photograph A determination step is provided for determining the amount of deviation of the map from the map image, and the range of the photographic map to be superimposed on the small block map determined to be less than the predetermined amount by the determination step is cut out to form the reference map. Create it.

[0012]

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing a method of photographing a set of aerial photographs 5 and 6 used in a method of correcting map data of a vector map 20 (see FIG. 3) according to one embodiment of the present invention. The photographing of the aerial photographs 5 and 6 is performed by the photographing camera 2 mounted on the aircraft 1. When photographing the photographing target area 3 with the photographing camera 2, the aircraft 1
Represents a linear flight path 4 at a constant speed from the west to the east over the predetermined altitude H (for example, altitude of 10,000 m).
To fly. In the present embodiment, the photographing camera 2 for photographing the aerial photographs 5 and 6 is mounted on the aircraft 1. However, for example, such a photographing camera may be mounted on a helicopter, a balloon, or an artificial satellite.

The photographing camera 2 performs photographing when the aircraft 1 passes through a photographing point 4a on the flight path 4 and a photographing point 4b separated by a predetermined distance from the photographing point 4a. Specifically, when the airplane 1 passes through the photographing point 4a, the photographing range S1 on the ground is photographed, and when the airplane 1 passes through the photographing point 4b, the photographing range S2 on the ground is photographed. Here, the photograph taken of the photographing range S1 is the aerial photograph 5, and the photograph taken of the photographing range S2 is the aerial photograph 6.
It is. The photographing target area 3 photographed in the aerial photographs 5 and 6 is an area corresponding to the vector area map A6 for one section of the vector map 20 shown in FIG.

The photographing ranges S1 and S2 are provided with an overlapping photographing range ΔS in which adjacent portions thereof are overlapped by a predetermined ratio (for example, approximately 60%). Camera 2
Is set so that the center of the overlapping shooting range ΔS and the center of the shooting target area 3 substantially coincide with each other.
6, and each of the aerial photographs 5 and 6 has a photographing range S
1, overlapping images 5a and 6a of the overlapping imaging range ΔS in S2 are respectively taken.

The area covered by the two photographing ranges S1 and S2 is larger than the area of the photographing target area 3, and a set of aerial photographs 5 and 6 of the photographing target area 3 are taken.
Is assumed to have photographed an area sufficiently larger than the photographing target area 3.

FIG. 2 is a block diagram showing an electrical configuration of the vector map management system 10 for managing and editing (correcting) the vector map 20. The vector map management system 10 includes a CPU 11, a ROM 12, a RAM 13
, A gate array 14, a hard disk drive (hereinafter referred to as “HD”) 15, a scanner 16, and an input device 1
7 and a display 18 are provided. The CPU 11, the ROM 12, the RAM 13, and the gate array 14 are interconnected by an address bus, a data bus, a control signal line, and the like.

The CPU 11 is an arithmetic unit that operates based on a program stored in the ROM 12, an operating system (OS) and various application programs stored in the HD 15, and performs various types of information processing. The ROM 12 is a non-rewritable memory that stores various data in addition to a basic program for operating the CPU 11. The RAM 13 is used to temporarily store various data when executing each operation of the vector map management system 10. It is a rewritable memory.
The gate array 14 includes an HD 15, a scanner 16,
It functions as an interface between the input device 17 and the display 18 and the CPU 11.

The HD 15 is a vector map management system 1
0 is a rewritable large-capacity storage medium for storing an operating system (OS) and various application programs. This large-capacity storage medium HD1
5 mainly includes a control program 15a which is an OS of the vector map management system 10, and an image reading program 15
b, an image editing program 15c, a vector map data memory 15d, a photograph map data memory 15e, a reference image data memory 15f, a map management program 15
g and a vector map editing program 15h.

The image reading program 15b includes the scanner 1
Aerial photographs 5 and 6 (see FIG. 1) are read by 6 and Ta
Photographic maps 22 and 23 composed of image image data in the gged Image File Format (TIFF for short) format (FIG. 3)
Application program for conversion (creation) to an application program. The image reading program 15b includes a reading range of an image read by the scanner 16, a reading resolution,
A color tone correction value can be set. The image editing program 15c is an application program used to create a plurality of correction reference images R01 to R25 (see FIG. 3) used for correcting the vector map 20 from the photographic maps 22 and 23.

The vector map data memory 15d has the structure shown in FIG.
Is a memory for storing the vector map 20 shown in FIG. 1, and stores the respective vector area maps A1, A2, A3,... Constituting the vector map 20.
The photo map data memory 15e is a memory for storing file data of the photo maps 22, 23 read by the scanner 16, and the reference image data memory 15f is a plurality of correction reference images created from the photo maps 22, 23. This is a memory for storing file data of R01 to R25.

The map management program 15g stores the vector map 2 stored in the vector map data memory 15d.
0, the photo maps 22, 23 stored in the photo map data memory 15e, and the correction reference images R01 to R25 stored in the reference image data memory 15f, which are application programs for associating with each other. . Further, the vector map editing program 15h stores the vector area maps A1, A2, A3,... Of the vector map 20 stored in the vector map data memory 15d.
・ This is an application program used to correct the problem.

The scanner 16 is a device for reading the images of the aerial photographs 5 and 6 based on the conditions set by the image reading program 15b. The input device 17 allows the operator to input various data to the vector map management system 10,
It performs an operation for correcting the vector map 20, and includes a keyboard having a plurality of key switches and a mouse for operating a mouse cursor displayed on the screen of the display 18. The display 18
Is a device for displaying various data processed by the vector map management system 10.

Referring to FIGS. 3 and 4, vector map 2
0 and a method of correcting the map data of the vector map 20 will be described. FIG. 3 is a diagram showing steps for creating the correction reference images R01 to R25 used for correcting the vector map 20. Vector map 20
Is, for example, a map image in a target area such as the Hokuriku area composed of vector image data. FIG.
As shown in (a), the vector map 20 is equally divided into a grid pattern and has a plurality of rectangular vector area maps A.
1, A2, A3,... Note that FIG.
In (a), among a plurality of vector area maps A1, A2, A3,.
Only six vector area maps A1 to A36 are shown, and two vector area maps A1, A2, A3,.
The illustration of the vector unit diagram displayed five by five is omitted.

Each vector area map A1, A2, A3,...
Is a map image of an area having a width of approximately 2 km in the meridian direction and a width of approximately 1.5 km in the latitude line direction, for example, is constituted by vector image data. Each of these vector area maps A1, A2, A3,...
A coordinate position in the vector map 20 is determined based on a plane coordinate system 21 having coordinate axes 1a and latitude lines 21b, and a plurality of vector area maps A1, A2, A3,.
Are arranged at the respective coordinate positions, so that a seamless vector map 2 of the target area shown in FIG.
0 can be obtained. Also, vector district maps A1, A
The coordinate position of 2, A3, ... is the vector area map A
, A2, A3,... Are managed by the above-mentioned map management program 15g.

Here, the vector district map will be described using the vector district map A6 as an example. As shown in FIG. 3B, the vector area map A6 is equally divided into a grid pattern, and a total of 25 rectangular vector unit figures A6a to A6a are displayed.
6y. The size of the section represented by each vector unit diagram A6a to A6y is, for example, 40 in the meridian direction.
The width is 0 m and the latitude line direction is 300 m. In addition, the coordinate positions of the vector unit maps A6a to A6y in the vector map 20 are determined based on the same plane coordinate system 21 as the vector area map A6. Also, 25 vector unit diagrams A6 in the vector area map A6
The coordinate positions of a to A6y are represented by their vector unit diagrams A6a to A6y.
It is managed by the map management program 15g based on the file name given differently for each A6y.

Although not shown in FIG. 3, the vector area maps A1 to A5, A7, A8,... Are equally divided in a grid pattern similarly to the vector area map A6. , Each of which has 25 rectangular vector unit diagrams. Moreover, the coordinate positions in the vector map 20 are also determined based on the plane coordinate system 21 for each vector unit diagram in each vector area map A1 to A5, A7, A8,. The coordinate position of is also based on the file name given differently for each vector unit diagram,
It is managed by the map management program 15g.

Next, a method of correcting map data of the vector map 20 will be described. In this embodiment, the map data correction method will be described by taking the vector area map A6 in the vector map 20 as an example.
5, A7,... Can be used to correct the vector image data by the same correction method.

First, when the power of the vector map management system 10 is turned on, the CPU 11 loads the control program 15a from the HD 15 onto the RAM 13 and executes it. By executing the control program 15a, the HD1
5, when the scanner 16, the input device 17, and the display 18 become usable, the operator operates the input device 17 to instruct the image reading program 15b to start. In accordance with this instruction, the CPU 11 loads the image reading program 15b from the HD 15 onto the RAM 13 and executes it. After the execution of the image reading program 15b, the aerial photographs 5, 6 are read by the scanner 16 (reading step).

While the aerial photograph 5 is installed on the scanner 16, the resolution of the image read by the scanner 16 is adjusted by the input device 17 operated by the operator.
b. Here, the value of the set reading resolution is, for example, 800 dpi. After the reading resolution is set, when the input device 17 instructs the scanner 16 to read an image, the image reading program 15b
Thus, the aerial photograph 5 is read by the scanner 16, and a photographic map 22 shown in FIG. 3B is created by this reading (first reading step).

After the creation of the photographic map 22, the same processing as the above-described processing for creating the photographic map 22 from the aerial photograph 5 is performed on the aerial photograph 6, and the photographic map shown in FIG. 23 are created (second reading step). The photographic maps 22 and 23 thus created are displayed on the display 1.
8 is displayed once.

Photo map 2 displayed on display 18
If the images 2 and 23 are unclear, the operator operates the input device 17 to read the image reading program 15b.
Is changed, and the color tones of the photographic maps 22 and 23 are corrected to obtain a clear image. Note that a color tone correction value capable of clearly displaying the photographic maps 22, 23 may be set in the image reading program 15b in advance.

Here, the aerial photographs 5 and 6 are given unique photograph numbers, respectively, and the photograph maps 22 and 23 are given the photograph numbers of the aerial photographs 5 and 6 as file names, and are in TIFF format. Are written and stored in the photo map data memory 15e of the HD 15.

After the photographic maps 22 and 23 have been created, the operator operates the input device 17 to operate the image reading program 1.
When the end of 5b is instructed, the photographic maps 22, 23 are temporarily deleted from the display 18, and the image reading program 15b is ended. Then, the input device 1 by the operator
By the operation of 7, the activation of the image editing program 15c is instructed. In accordance with this instruction, the CPU 11 loads the image editing program 15c from the HD 15 onto the RAM 13 and executes it. When the image editing program 15c is executed, H is operated by the operation of the input device 17 by the operator.
The photo maps 22, 23 stored in the photo map data memory 15e of D15 are loaded on the RAM 13 and displayed on the display 18.

The map management program 15g is started with the loading of the photo maps 22 and 23. The map management program 15g stores the file name of the vector district map corresponding to the file name of the loaded photo map, and the unmodified (before correction) vector district map A6 corresponding to the photo maps 22, 23 is a vector. It is extracted from the map data memory 15d (extraction step). The extracted vector area map A6 is displayed on the display 18 by being superimposed on the photographic maps 22, 23 by the image editing program 15c, as shown in FIG. 3B.

Here, the photographic map 23 is temporarily hidden, and only the photographic map 22 and the vector area map A6 are displayed on the display 18 as shown in FIG.
The vector district map A6 is superimposed on the photograph map 22.
The vector area map A6 displayed on the display 18 is:
The operator operates the input device 17 to activate the photo map 2
2 on the display 18. By this movement, two vector unit diagrams A of the vector district map A6
The vector images in 6a and A6o are matched with the image image of the photograph map 22. Thus, the vector district map A
The position of No. 6 is corrected with respect to the photo map 22.

In this embodiment, the vector area map A6
Is moved with respect to the photo map 22, thereby correcting the position of the vector area map A6 with respect to the photo map 22. Conversely, the position of the vector map may be corrected by moving the photo map with respect to the vector area map. .

In the position correction for the photo map 22 of the vector district map A6, the operator sets the vector image of the vector unit diagrams A6a and A6o of the vector district map A6 and the photo map 22.
Is determined visually by the operator (determination step). As a result of this determination, if it is determined that the deviation amount is equal to or less than the predetermined amount, the image editing program 15c collectively cuts out the image images corresponding to the fifteen vector unit diagrams A6a to A6o from the photograph map 22, The fifteen correction reference images R01 to R01 shown in FIG.
R15 is collectively created (first creation step).

After the fifteen correction reference images R01 to R15 are created, the photographic map 22 is temporarily hidden, and FIG.
As shown in (d), only the photographic map 23 and the vector area map A6 are displayed on the display 18, and the vector area map A6 is superimposed on the photographic map 23. The vector area map A6 is displayed by operating the input device 17 by the operator.
The photograph map 23 is moved on the display 18. By this movement, the vector images in the two vector unit diagrams A6p and A6y of the vector district map A6 match the image images of the photographic map 23. Thereby, the position of the vector district map A6 is corrected with respect to the photographic map 23.

In the position correction for the photographic map 23 of the vector area map A6, the amount of deviation between the vector images of the vector unit diagrams A6p and A6y of the vector area map A6 and the image image of the photographic map 23 is visually determined by the operator. (Judgment step). As a result of this determination, if it is determined that the deviation amount is equal to or less than the predetermined amount, the image editing program 15c executes
Image images corresponding to the zero vector unit diagrams A6p to A6y are cut out collectively from the photograph map 23, and are shown in FIG.
(E) Ten correction reference images R16 to R25 are collectively created (second creation step). Here, in the correction reference images R01 to R25 created as described above, as shown in FIG. 4C, only the image image 22a is displayed, and the vector image 20a is not displayed. .

Referring to FIG. 4, if it is determined that the difference between the vector images of the vector unit diagrams A6a to A6y and the image images of the photographic maps 22 and 23 is equal to or larger than a predetermined amount, the correction is performed. The process of re-creating the reference images R01 to R25 (the reference diagram re-creating process) will be described. FIG.
4A and 4B are diagrams illustrating steps for re-creating the correction reference images R04 and R05. In FIGS. 4A and 4B, a part of the image image 22a of the photograph map 22 is illustrated by a broken line, and a vector area is illustrated. A part of the vector image 20a of FIG. A6 is illustrated by a solid line. In FIG. 4C, the image 22a of the correction reference image R05 is shown by a solid line.

When displayed on the display 18, the photographic map 22 is a color image, and the vector area map A6 is drawn with lines of various colors.
Can be easily distinguished from the image of the vector district map A6. In FIG. 4, the vector area map A6
As part of the vector unit diagrams A6d, A6e, A6
i, A6j.

Photo map 2 created from aerial photographs 5 and 6
In Nos. 2 and 23, the upper right corner is distorted. For this reason, as described above, when the entire vector area map A6 is superimposed on the photographic map 22, when the vector images 20a of the vector unit diagrams A6a and A6o and the image image 22a of the photographic map 22 are matched, FIG. a) As shown in FIG.
Large deviation occurs between the image image 22a in the upper right corner of the vector area map A6 and the vector image 20a in the upper right corner of the vector area map A6. Specifically, the vector unit diagram A6
e and its surrounding vector unit diagrams A6d, A6i, A6
A large deviation occurs between the vector image 20a of j and the image image 22a of the photographic map 22.

Therefore, in such a case, for example, the vector unit diagram A6e that is displaced from the image image 22a of the photo map 22 is superimposed again on the photo map 22, and the photo map 22 is displayed on the display 18. Move. By this movement, as shown in FIG. 4B, the amount of deviation between the vector image 20a of the vector unit diagram A6e and the image image 22a of the photographic map 22 is reduced. In the same manner, the deviation of the vector map A6d, A6i, A6j from the image 22a of the photo map 22 can be corrected.

As a result, the amount of deviation between the vector image 20a of the vector unit diagram A6e and the image image 22a of the photographic map 22 is visually determined (judgment step), and it is determined that the amount of deviation is equal to or less than a predetermined value. Then, the image corresponding to the vector unit diagram A6e is cut out from the photographic map 22 by the image editing program 15c, and FIG.
As shown in (5), the correction reference image R05 is re-created. In the same manner, other vector unit diagrams A6
d, reference image for correction R04 corresponding to A6i, A6j,
R09 and R10 can be recreated.

Returning to FIG. Correction reference image R
After creation of R01 to R25, 25 correction reference images R01
.. R25 are given different file names by the image editing program 15c, and are written and stored in the reference image data memory 15f of the HD 15, respectively. The file name of each of the correction reference images R01 to R25 is determined by the map management program 15g to be one of the fifteen vector unit diagrams A6a to A6y of the vector district map A6.
They are managed in association with each other.

After the correction reference images R01 to R25 are stored in the reference image data memory 15f, when the operator operates the input device 17 to terminate the image editing program 15c, the photographic maps 22, 23, The vector area map A6 and the correction reference images R01 to R25 are temporarily deleted from the display 18, and the image editing program 15
c is terminated. Thereafter, activation of the vector map editing program 15h is instructed by the operation of the input device 17 by the operator. In accordance with this instruction, the CPU 11 transfers the vector map editing program 15h from the HD 15 to the RAM.
13 and executed. The vector map editing program 15h operates a vector area map A on the vector map 20 by operating the input device 17 by the operator.
Are loaded on the RAM 13 one by one and displayed on the display 18.

For example, when correcting the vector area map A6, the vector map editing program 15h
Vector area map A6 is vector map data memory 15d
Is loaded onto the RAM 13 and displayed on the display 18. After the display of the vector district map A6, the correction management reference images R01 to R25 corresponding to the vector district map A6 are loaded from the reference image data memory 15f of the HD 15 onto the RAM 13 by the map management program 15g. The information is superimposed on each of the diagrams A6a to A6y and displayed on the display 18.

Each vector unit map A of the vector area map A6
Modification reference images R01 to R25 corresponding to 6a to A6y
Are superimposed on each other, the vector images of the vector unit diagrams A6a to A6y and the image images of the correction reference images R01 to R25 are compared, and based on the image images of the correction reference images R01 to R25, the vector map editing program is executed. 1
5h, each vector unit map A6 of vector area map A6
The vector images at a to A6y are traced and corrected (correction step). .. In the vector map 20 as well as the vector area map A6, using the correction reference images created for each vector area map. , As described above.

As described above, in the present embodiment, the correction reference images R01 to R25 serving as the reference for correcting the vector area map A6 of the vector map 20 are the vector images extracted from one section of the vector map. Photo map 22, based on each vector unit map A6a-A6y of district map A6,
Since it is cut out from 23, when it is superimposed on the vector image of the vector map 20, the amount of deviation between the vector image and the image images 22a of the correction reference images R01 to R25 can be minimized. This modified reference image R
By correcting the vector image of the vector map 20 based on 01 to R25, the vector image of the vector map 20 can be corrected within a small error range without converting the aerial photographs 5 and 6 into ortho image data. . This eliminates the need for a dedicated facility for converting the aerial photographs 5 and 6 into ortho image data, thereby reducing the cost of correcting the vector map 20.

As described above, the fifteen correction reference images R01 to R15 are the aerial photographs 5 of the photographing range S1.
, While the remaining ten correction normative images R16 to R25 are cut out from the aerial photograph 6 photographing the photographing range S2.
Cut from 3. For this reason, the vector district map A6 is superimposed on only one of the photo map 22 and the photo map 23,
Compared to the case where all the reference images for correction R01 to R25 are cut out from only one of the photo map 22 or the photo map 23, when the vector map 20 is corrected, each of the vector unit diagrams A6a to A6y of the vector map 20 is corrected. The amount of deviation between the vector image and the image images 22a of the correction reference images R01 to R25 superimposed on the vector image can be further reduced.

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. Can easily be inferred.

For example, in this embodiment, the vector map 20
25 using the photo maps 22, 23 created from the set of aerial photographs 5, 6 to modify the vector district map A6 of FIG.
Although the correction reference images R01 to R25 were created, when correcting such a one-section vector district map, 25 corrections were made using a set of photo maps created from a set of aerial photographs. It is not necessary to create a reference image, and one of a set of aerial photographs may be used to create 25 correction reference images.

[0053]

According to the map data correction method according to the first aspect, when correcting a vector map using an aerial photograph, the aerial photograph is not converted to ortho image data,
There is an effect that the map image of the vector map can be corrected. This eliminates the need for a dedicated facility for converting the aerial photograph into ortho image data, thereby reducing the cost of correcting the vector map.

According to the map data correction method of the second aspect, in addition to the effect of the map data correction method of the first aspect, the first photographic map can be obtained by the first reading step at the first photographing point at the target area. While the second photo map is created from the second photograph of the target area at the second photographing point by the second reading step. Since the first and second photographs partially overlap in the photographing range, an overlapping portion can be generated between the map image of the first photograph map and the map image of the second photograph map.
Here, the first creation step creates a first reference map by superimposing a part of the block diagram on the first photo map, while the second creation step superimposes the rest of the block diagram on the second photo map. To create a second normative map.

In this way, the map image of the photographic map and the map image of the block diagram can be compared with a case where the reference map is created by superimposing the entire block diagram on one of the first photographic map and the second block diagram. Is further reduced, and a reference map having a smaller deviation error with respect to the vector map can be created. Therefore, when the vector map is corrected based on the reference map in the correction process, it is possible to suppress a decrease in accuracy of the vector map due to the correction of the vector map.

According to the map data correction method according to the third aspect, in addition to the effect of the map data correction method according to the first or second aspect, in addition to the subsections in which the deviation amount is determined to be equal to or more than the predetermined amount in the determination step. Regarding the drawing, the reference map can be recreated by superimposing the small block diagram again on the photographic map in the reference diagram recreating step. Therefore, when the entire composite block diagram is superimposed on the photo map at once, even if the map image of some of the small block diagrams is displaced from the map image of the photo map due to the distortion of the photo map, The deviation from the photographic map can be corrected for each small block diagram, and there is an effect that a reference map having a smaller deviation error with respect to the vector map can be created.

According to the map data correcting method according to the fourth aspect, in addition to the effect of the map data correcting method according to any one of the first to third aspects, the normative map creation step includes the step of determining the composite block diagram by the determination step. When it is determined that the shift amount between each of the small block diagrams and the photographic map is equal to or less than the predetermined amount, the range of the photographic map to be superimposed on the plurality of small block diagrams with small shift amounts can be cut out at a time. Therefore, a plurality of subdivision maps are superimposed one by one on the photographic map, and
There is no need to cut out each piece, and there is an effect that the work efficiency can be improved accordingly.

[Brief description of the drawings]

FIG. 1 is a diagram showing a set of aerial photography methods used in a method of correcting map data of a vector map according to one embodiment of the present invention.

FIG. 2 is a block diagram illustrating an electrical configuration of a vector map management system that manages and edits a vector map.

FIG. 3 is a diagram showing a process for creating a correction reference image used for correcting a vector map.

FIG. 4 is a diagram showing a process for re-creating a correction reference image.

[Explanation of symbols]

3 shooting target area (target area) 4a, 4b shooting point (first shooting point,
Second photographing point) 5, 6 Aerial photograph (aerial photograph, first aerial photograph, second aerial photograph) 16 Scanner (image reading device) 20 Vector map 20a Vector image (map image) 22, 23 Photo map 22a Image image (Map image) A1 to A36 Vector district map (composite plot,
A6a-A6o Vector unit diagram (part of small block diagram,
A6p to A6y vector unit diagram (part of subdivision diagram, part of subdivision diagram)
R01 to R15 Correction reference image (first reference diagram,
R16-R25 Correction reference image (second reference diagram,
Part of the normative map)

Claims (4)

[Claims] 1. A map data correcting method for correcting a vector map having a map image composed of vector image data based on an aerial photograph taken from above, comprising: a photograph map having a map image composed of image image data; A reading step of reading an aerial photograph by an image reading device, an extracting step of extracting a block diagram which is a map image of one block from a vector map, and a reading step of extracting the block diagram extracted by the extracting step. After the superimposition on the photo map created by the above, the map image of the photo map is matched with the map image of the block diagram, and a superimposed range with the block diagram is cut out from the photo map to create a reference map creating process. And superimpose the reference map obtained by the reference map creation process on the block on the vector map corresponding to the reference map, and map the map image in the block into the reference map. Map data correction method characterized in that it comprises a correcting step for correcting, based. 2. The aerial photograph, wherein the first aerial photograph of the target area from a first photographing point at a predetermined altitude is overlapped with a part of a photographing range in which the first aerial photograph is photographed. A second aerial photograph photographing the target area at a second photographing point separated by a predetermined distance from the first photographing point, and wherein the reading step reads the first aerial photograph by an image reading device and reads the first photograph map. A first reading step of creating
The second aerial photograph is read by an image reading device and
A second reading step of creating a photographic map, wherein the reference map creating step superimposes a part of the block diagram extracted in the extracting step on the first photographic map, and then maps the first photographic map Is matched with the map image in a part of the block diagram, a range overlapping with the part of the block diagram is cut out from the first photographic map to create a first reference map, and After superimposing the remaining portion of the block diagram on the second photo map, the map image of the second photo map is matched with the map image in the remaining portion of the block diagram, and the second photo map is combined with the remaining portion of the block diagram. Cut the overlapping area to create a second reference map.
The method according to claim 1, further comprising a creating step. 3. The block diagram extracted in the extraction step is a composite block diagram in which a plurality of small block diagrams obtained by dividing a vector map into a plurality of small blocks are grouped. A determination step of determining the amount of deviation between the map images of the plurality of small division maps and the map image of the photographic map when the small division map is superimposed on the photographic map; and After the small parcel map determined to be present is superimposed again on the photo map, the map image of the photo map is matched with the map image of the small parcel map, the superimposed area with the small parcel map is cut out from the photo map, and the reference map is re-created. 3. The method according to claim 1, further comprising a step of regenerating a reference map. 4. The section map extracted in the extracting step is a composite section diagram in which a plurality of small section diagrams obtained by dividing a vector map into a plurality of small sections are collected. When the small parcel map is superimposed on the photographic map, the map image of the plurality of small parcel maps and the map image of the photographic map are provided with a judging step of judging, and the judging step makes the misalignment amount equal to or less than a predetermined amount. 4. The map data correcting method according to claim 1, wherein a reference map is created by cutting out a range of the photographic map to be superimposed on the small block diagram determined to be a reference map.