JP5175120B2 - Feature outline creation device - Google Patents

Description

  The present invention relates to a feature outline creating apparatus that creates an outline of a feature in an image obtained by photographing the feature from above (hereinafter referred to as “aerial photograph image”), a map, or the like, and in particular, an erroneous outline. The present invention relates to technology for preventing creation.

  When creating a map based on an aerial photograph image or the like, it is important to accurately define the outline of the feature.

  For example, property tax is levied according to registration such as building indication registration, building indication change registration, or building loss registration, etc., but even if there is no registration, it is indispensable to acquire aging information of buildings It becomes.

  The secular change information of a building can be acquired using map data of an outline of a feature or an aerial photograph image. The map data includes graphic information and attribute information, and the map data file includes a shape file proposed by ESRI, USA.

  Moreover, the following patent document 1 is mentioned as a well-known technical document regarding building secular change information acquisition. The technique described in the following Patent Document 1 uses a line drawing map or aerial photograph image describing the outline of a feature and an aerial photograph image obtained by photographing the same area later to detect a change in the feature between the two. The present invention relates to a detection device. Moreover, the following patent document 2 is mentioned as a well-known technical document regarding the method of actually creating the outline of a feature. This technique relates to a contour shape extraction apparatus that extracts a contour shape of a feature from an aerial photograph image, and extracts an image region by comparing old and new aerial photograph images such as satellite images.

JP 2002-206925 A JP-A-2005-173128

  However, since the technique described in Patent Document 2 extracts a contour line by comparing old and new aerial photograph images, there is a problem in the accuracy of detection results. In reality, the contour line of the feature is often manually created by a human, and there is a problem that a line having a shape different from the contour of the actual feature is often created.

  An object of the present invention is to create a contour line of a feature with high accuracy and to prevent erroneous creation of the contour line.

  In order to achieve the above object, the feature outline creating system of the present invention includes a display device for displaying an aerial photo image or a map, and a feature outline input device for inputting the outline of the feature, Features a map data of feature outlines, a numerical surface model (hereinafter referred to as DSM (Digital Surface Model)) database, and a mesh information database that stores mesh information obtained by dividing the area into a grid. Alternatively, an aerial photo image / map display means for displaying a map, a feature outline creating means for creating a feature outline, and a mesh creating means for creating a mesh by dividing the target area into a grid at regular intervals, Corresponding mesh selection means for selecting a mesh corresponding to the record in the DSM database, elevation value change detection means for detecting the change in elevation value from the DSM data, A mesh information output means that outputs mesh information to the information database, an elevation value change amount display means that changes the tone and brightness according to the elevation value change amount, and a threshold value for the elevation value change amount. Altitude value change amount threshold setting means and feature contour line creation control means for controlling the creation of the contour line at a location where the elevation value change amount is small.

  That is, according to one aspect of the present invention, there is provided a feature outline creating apparatus having a display device that displays an aerial photograph image or a map, and a feature outline input device that inputs an outline of a feature. A map data storage unit that stores map data in which a feature outline can be input by the input device, a position of an arbitrary point, a unique ID of the arbitrary point, and an elevation value of the arbitrary point A mesh information database for storing a configured DSM database, a mesh position obtained by dividing a region into a grid, and a unique ID of the arbitrary mesh; A mesh creation unit that creates a mesh by dividing the mesh into a shape; a corresponding mesh selection unit that selects a mesh corresponding to a record in the DSM database with reference to the mesh information database; An elevation value change amount detection unit that detects a change amount of the elevation value that depends on the position based on the DSM database, and a display unit for each elevation value change amount that displays the difference in the change value of the elevation value in a visually recognizable manner And an elevation value change amount threshold value setting unit for setting a first threshold value related to the change amount of the elevation value in order to determine whether or not the actual contour is used, and suppresses the creation of the contour line at a location where the change amount of the elevation value is small There is provided a feature contour line creation device comprising a feature contour line creation control unit for performing control.

  The feature contour line creation control unit performs at least one of control for prohibiting the creation of the contour line or control for displaying a message to call attention regarding the creation of the contour line at a location where the amount of change in the elevation value is small. Preferably it is done.

  Before performing the feature outline creation control, the elevation value change amount obtained by the elevation value change quantity detection unit is an elevation value that is smaller than the first threshold value and can be used as an outline candidate. An outline candidate may be obtained based on the threshold value of 2, and the outline candidate may be stored in the storage unit. Can a contour line candidate be automatically and widely acquired by a second threshold value smaller than the first threshold value, stored, and included in an area that is greater than or equal to the first threshold value greater than the second threshold value? It is possible to obtain an indication of whether or not the actual contour line is based on the result.

  Moreover, you may have a threshold value adjustment part which adjusts the said 1st threshold value. By adjusting the first threshold value, the threshold value can be adjusted and displayed so that it can be easily determined whether or not it is a contour line.

  By changing the color tone and brightness, making it impossible to create contour lines, and displaying a warning message when creating contour lines, in places where the height difference from the ground is small and not the contour creation target feature Incorrect contour creation can be prevented.

According to the feature outline creating apparatus of the present invention, there are the following effects.
By changing the color tone and brightness, making it impossible to create contour lines, and displaying a warning message when creating contour lines, in places where the height difference from the ground is small and not the contour creation target feature In addition, it is possible to prevent erroneous creation of the feature outline. Moreover, since the range which produces an outline is limited, creation efficiency can be improved.

  Hereinafter, a feature outline creating system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram showing a configuration example of a feature outline creating system according to the present embodiment. As shown in FIG. 1, the feature outline creating apparatus 1 according to the present embodiment includes a database that stores map data 14, a DSM database 15, and a mesh information database 16. Furthermore, for example, it has a processing device 11 that performs various processes, a display device 12 that displays an aerial photograph image or a map, and a feature outline input device 13 such as a mouse that inputs the outline of the feature. Yes. The display device 12 and the input device 13 may be provided in another terminal and the terminal and the system may be connected.

  In the processing device 11, the aerial photograph image / map display unit 111 calculates attribute values such as resolution, coordinate values, and map coordinate values of the aerial photograph image, and displays the aerial photograph image and the map on the display device 12. Display is possible, and the operator can visually confirm the validity of the position of the aerial photo image and the map.

  When the operator performs an input operation of the feature outline from the feature outline input device 13 while viewing the aerial photograph image or map displayed on the display device 12, the feature outline creation unit 112 displays the map. The feature outline data is inserted into the data 14. In the mesh creation unit 113, a mesh is created by dividing a target region for which a feature outline input process in an aerial photograph image or a map is divided, for example, at regular intervals. The corresponding mesh selection unit 114 selects a mesh corresponding to the coordinates of an arbitrary point stored in the DSM database 15 from the mesh information database 16. Here, as shown in FIG. 2, the data stored in the DSM database 15 includes a unique ID 21 of an arbitrary point, a latitude 22 of the arbitrary point, a longitude 23 of the arbitrary point, and an altitude value 24 of the arbitrary point. And. The data stored in the DSM database 15 is data acquired by a radar or the like, and existing data can be used.

  On the other hand, as shown in FIG. 3, the data stored in the mesh information database 16 includes a unique ID 31 of the arbitrary mesh, a north end latitude 32 of the arbitrary mesh, a south end latitude 33 of the arbitrary mesh, and a west end of the arbitrary mesh. It has a longitude 34, an east end longitude 35 of an arbitrary mesh, and a flag 36 indicating whether or not a contour can be created. A mesh area can be defined by the north end latitude 32 of the arbitrary mesh, the south end latitude 33 of the arbitrary mesh, the west end longitude 34 of the arbitrary mesh, and the east end longitude 35 of the arbitrary mesh. At the same time, a flag indicating whether or not an outline can be created is added.

  The elevation value change detection unit 115 acquires elevation values at arbitrary points and surrounding points from the DSM database 15, and detects the change in elevation value.

  In the mesh information output unit 116, based on the value of the elevation value change detected by the elevation value change detection unit 115, for example, in the mesh information database 16, for example, a record corresponding to a region where the change amount is small is small. A flag indicating that it is a change amount area is set.

  The elevation value change amount display unit 117 causes the display device 12 to display the color tone and brightness of the value detected by the elevation value change amount detection unit 115 in accordance with the change amount of the elevation value. Thereby, the operator can visually confirm the change distribution of the altitude value.

  In the altitude value change amount threshold setting unit (threshold adjustment unit) 118, the operator can freely set the threshold by using a slide bar or the like. In accordance with the set value, the color tone and brightness controlled by the display unit 117 for each change in altitude value can be changed. Therefore, it is possible to easily adjust the appearance and make it easy to see. The threshold value may be set by a text box, a pull-down menu, or the like. Since it is considered that there is a low possibility that the location where the change amount of the altitude value is small is the contour line of the feature, the feature contour creation control unit 119 makes it impossible to create the contour line at the location where the change amount is small. For example, it is preferable to perform control so as to force the user to perform processing different from normal processing. A mode for displaying a message for allowing the operator to confirm whether the outline creation is appropriate may be displayed in place of such control or in place of the control to be impossible.

  The feature outline creation control unit 119 is linked to the altitude value change amount threshold setting unit 118, and can adjust the determination criterion regarding whether or not the change amount is small by changing the threshold value. For example, in areas where high buildings are concentrated (so-called advanced commercial areas), the difference in height between the ground and the top floor of the building is large, but in areas where low-rise houses are concentrated (so-called residential areas), Since the altitude difference from the top floor is small, it is preferable to be able to change the threshold value in order to accurately create the contour line.

  FIG. 4 is a flowchart showing a processing procedure of mesh information output and display according to elevation value change amount.

  When the process is started, in step S41, the mesh creation unit 113 automatically creates a mesh in which the display target area is divided into a grid at regular intervals, and information such as the mesh coordinate values shown in FIG. Store in the database 16. In step S42, loop processing is started for all point records (point ID = 1, 2, 3,...) Stored in the DSM database 15. In step S43, first, a mesh record corresponding to the coordinates of the point of ID = 1 is selected from the mesh information database 16 shown in FIG. Here, the target mesh is selected. In step S44, based on the DSM database shown in FIG. 2, the amount of change in the elevation value is calculated from the elevation value at an arbitrary point in the selected mesh and the surrounding points.

  In step S45, based on the elevation value change obtained in step S44, it is determined whether or not the value is equal to or greater than a threshold value (having a unit of height. For a house and a garden, for example, about 50 cm). To do. If the elevation value change amount is equal to or greater than the threshold (YES), the process proceeds to step S46, and if it is less than the threshold (NO), the process proceeds to step S47.

  In step S46, for example, at least one of the first color tone and the first luminance is displayed so as to indicate that this region is a region having a large change amount. In this case, the outline creation enable / disable flag 36 in the mesh information database of FIG. 3 is set to “True”, and it is stored that the outline can be created. If the default value of the outline creation enable / disable flag 36 is “True”, it is not necessary to change the flag here.

  On the other hand, in step S47, a flag (the same flag as the flag in FIG. 3) indicating that the change amount is small is set in the mesh record in the mesh information database 16 (if the default value is “True”). , Change to “False”).

  In step S48, this area is displayed in at least one of the second color tone or the second luminance different from (identifiable) the first color indicating that the change amount is a small area.

  Next, returning to step S42, if there is a next point (for example, ID = 2), the process from step S43 is continued for that point. Finally, when there is no next point, the process ends (loop end). With the above processing, it is possible to display for each mesh in a visually recognizable form whether or not there is a large difference in elevation between a certain point in the mesh and neighboring points around it.

  As described above, first, after the system is started, the processing shown in FIG. 4 is performed. In the process of FIG. 4, a mesh is created and DSM data is read. Based on the mesh and DSM data, the “region with a large amount of change” or the “region with a small amount of change” is determined, and the result is stored in the mesh information database of FIG.

  After the process shown in FIG. 4 is completed, the operator inputs a contour line. In response to the operator's contour line input, the system determines “whether or not the input at the point is valid” from the coordinate value and the mesh information database.

  FIG. 5A is a diagram illustrating a display example of an aerial photo image showing a house adjacent to a garden that is not a contour line creation target. A house 511a and a house 512a indicated by reference sign A are adjacent to the garden 511b and the garden 512b, respectively. It is assumed that the operator of the feature outline creating apparatus according to the present embodiment needs to create an outline of only the house. However, depending on the sharpness of the aerial photograph image, it may be difficult to distinguish between the house 511a and the garden 511b and the house 512a and the garden 512b. This is because the difference in height between the house and the garden is not large in the image taken from the high sky.

  FIG. 5B is a diagram illustrating an example of the distribution of DSM data in the region illustrated in FIG. 5A. The house outline 521a, the garden outline 521b, the house outline 522a, and the garden outline 522b are outlines of the house 511a, the garden 511b, the house 512a, and the garden 512b shown in FIG. 5A, respectively. Gray circles and black circles dispersed in FIG. 5B indicate points where the altitude data shown in FIG. 2 exists, and a gray circle shown at point 523 indicates a point where the altitude is low. The black circle shown in Fig. 2 represents a point where the altitude is high. In FIG. 5B, two kinds of circles, gray and black, are shown. However, three or more kinds of different identifiable circles may indicate the height (high, medium, low, etc.). FIG. 5C is a diagram showing an example in which only mesh regions having a large elevation value change amount are grayed out in FIG. 5B. Here, the minimum unit of the mesh can be made to coincide with the rectangle surrounding the four adjacent points in the elevation data. Other selection methods may be used. The areas indicated by reference numerals 533 and 534 indicate areas where the elevation value change amount is greater than or equal to the threshold value in step S45 of FIG. 4, and the tone or luminance is changed as a large change amount area with respect to the elevation value in step S46. . The operator of the apparatus recognizes that the outline 531a and the outline 532a of each house and garden included in the gray display portions 533 and 534 are house outlines. In this case, since the dotted lines in the areas indicated by reference numerals 531b and 532b are not included in the gray display portions 533 and 534, the difference in elevation is small, and the boundary line of the garden 531b or the garden 532b is displayed so as to be understood as the contour line. Thus, it is possible to prevent erroneous input by the user. Further, even if the operator mistakenly tries to create a contour other than the gray display portion, the feature contour creation control unit 119 may reject the contour. Or you may make it display the message for confirming whether the creation of an outline is appropriate for an operator. The outline may be input only after waiting for a response to the message display and only when the response is valid. With the message display, attention can be drawn to the possibility that the contour line may be input incorrectly. The same effect can be obtained when input is not possible.

  In addition, since the contour creation range is limited, it is possible to improve work efficiency and creation accuracy regarding contour creation.

  In addition, this invention is not limited to the said embodiment, It can implement by changing suitably. For example, a warning sound may be sounded together with, or instead of, a message display for confirming whether the creation of the contour line is appropriate. In the apparatus shown in FIG. 1, the map database, the DSM database, and the mesh information database may be provided outside the apparatus so that information can be acquired from the server wirelessly or by wire.

  Further, after the process of FIG. 4, instead of the process of manually drawing the contour line, the processing apparatus 11 may automatically perform the process of FIGS. 5B and 5C to draw the contour line. That is, in FIG. 5B, it is assumed that there is a contour line between the black circle and the gray circle, and this is displayed or stored as a contour line candidate. Among these contour line candidates, as shown in FIG. There is also a method of determining a contour candidate included in the large change amount region with respect to a value as a true contour line. For example, in FIG. 4, in step S44, an elevation value change amount with a surrounding point is detected, and the detected elevation value change amount is smaller than the first threshold value, but it can be determined that there is clearly an elevation difference. If the boundary is equal to or greater than the threshold value, a line whose boundary can be said to be a contour line candidate is stored as a contour line candidate in, for example, the storage unit, and then, in step S45, a first threshold value that is larger than the second threshold value. Whether or not it can be said to be a true contour line may be determined based on whether or not it is included in a region having the above elevation difference. In this way, it is possible to automatically perform highly accurate input processing relating to the contour line. In this case, it is preferable to correct the outline before and after the process.

  The present invention can be used as an outline input device for a feature.

1 is a system configuration diagram showing an embodiment of the present invention. It is a block diagram of the data stored in the DSM database. It is a block diagram of the data stored in the mesh information database. It is a flowchart which shows the process sequence of a mesh information output and the display according to elevation value change amount. It is a figure which shows the example of a display of an aerial photograph image. It is a figure which shows the example of distribution of DSM data. It is a figure which shows the example which displayed in gray the location where an elevation value change amount is large.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Feature outline creation system, 11 ... Processing apparatus, 111 ... Aerial photograph image and map display part, 112 ... Feature outline creation part, 113 ... Mesh creation part, 114 ... Corresponding mesh selection part, 115 ... Elevation value Change amount detection unit, 116 ... mesh information output unit, 117 ... altitude value change amount display unit, 118 ... altitude value change amount threshold setting unit, 119 ... feature outline creation control unit, 12 ... display device, 13 ... ground Object outline input device, 14 ... map data, 15 ... DSM database, 16 ... mesh information database, 21 ... ID of arbitrary point, 22 ... latitude of arbitrary point, 23 ... longitude of arbitrary point, 24 ... elevation value of arbitrary point , 31 ... ID of an arbitrary mesh, 32 ... North latitude of an arbitrary mesh, 33 ... Southern latitude of an arbitrary mesh, 34 ... West longitude of an arbitrary mesh, 35 ... East longitude of an arbitrary mesh, 36 ... Flag indicating whether or not outline can be created in mesh 511a ... house 1, 511b ... garden 1, 512a ... house 2, 512b ... garden 2, 521a ... house outline 1, 521b ... garden outline 1, 522a ... house outline 2, 522 b, garden outline 2, 523, a point where elevation data exists and the value is low 524, a point where elevation data exists and a value is high, 531 a, house outline 1, 531 b, garden outline 1 532a ... house outlines 2, 532b ... garden outlines 2, 533 ... regions 1 where the elevation value change amount is large 534 ... regions 2 where the elevation value change amount is large.

Claims (4)

A feature outline having a display device for displaying an image (hereinafter referred to as “aerial photograph image”) or a map obtained by photographing a feature from above, and a feature outline input device for inputting the outline of the feature. A line creation device,
A map data storage unit for storing map data capable of inputting a feature outline by the input device;
A numerical surface layer model (hereinafter referred to as DSM (Digital Surface Model)) database including an arbitrary point position, a unique ID of the arbitrary point, and an elevation value of the arbitrary point;
A mesh information database for storing a mesh position obtained by dividing a region into a grid and a unique ID of an arbitrary mesh;
A mesh creation unit that creates a mesh by dividing a region for creating a contour of a feature into a grid; and
A corresponding mesh selection unit that selects a mesh corresponding to a record in the DSM database with reference to the mesh information database;
An elevation value change amount detection unit for detecting a change amount of the elevation value depending on the position based on the DSM database;
A display section for each change in elevation value, which displays the difference in elevation change in a visually recognizable manner,
An elevation value change amount threshold value setting unit for setting a first threshold value related to the change amount of the elevation value in order to decide whether or not to make an actual contour;
A feature outline creation device, comprising: a feature outline creation control unit that performs control to suppress creation of an outline when an elevation value change amount is smaller than the first threshold value.   The feature outline creation control unit displays a message for urging attention regarding the creation of the outline or the control for prohibiting the creation of the outline at a location where the amount of change in the altitude value is smaller than the first threshold. The feature outline creating apparatus according to claim 1, wherein at least one of the control is performed.   Before performing the feature outline creation control, the elevation value change amount obtained by the elevation value change quantity detection unit is an elevation value that is smaller than the first threshold value and can be used as an outline candidate. 3. The feature outline creating apparatus according to claim 1, wherein outline candidates are obtained based on a threshold value of 2, and the outline candidates are stored in a storage unit.   The feature outline creating device according to any one of claims 1 to 3, further comprising a threshold adjustment unit that adjusts the first threshold.

Images