JP6673761B2 - Viewpoint candidate display program and viewpoint candidate display device - Google Patents

Description

  The present invention relates to a viewpoint place candidate presentation program and a viewpoint place candidate presentation device.

  When a building such as a dam or a bridge is newly constructed, an observation deck or a parking lot may be provided at a place where the scenery including the building (viewable target) can be viewed. In such a case, it is necessary to select an appropriate place as a viewpoint where the observation deck and the parking lot are provided.

  The selection of the viewpoint is generally performed as follows. First, an appropriate distance is calculated as the distance from the building to the viewpoint based on the size of the building to be viewed. The appropriate distance depends on the application (distant, medium and near). Next, a concentric circle having a radius corresponding to the obtained distance is drawn around the place where the building is to be built on the map, and a region from which the viewpoint field is extracted is determined. Next, in the determined area, a candidate point that can be a viewpoint is specified based on the terrain and the like. Further, a viewpoint field is determined from the identified candidate points based on the results of a field survey and the like.

Ministry of Agriculture, Forestry and Fisheries, Technical Manual for Landscape Consideration in Rural Areas, Part 3 (Updated December 1, 2011) [Search April 20, 2016], Internet <URL: http: //www.maff.go. jp / j / nousin / sousei / gijutu_manual /〉

  With the development of virtual reality (VR) technology, a VR system is used to create a three-dimensional terrain model including a building to be viewed, and a landscape image (computer graphic (CG) image including the viewing target from any viewpoint・ Video) can be created. However, it is time-consuming and troublesome to select an appropriate place as a viewpoint from among many points included in the created model, and it is not easy.

  Then, an object of the present invention is to provide a viewpoint place candidate presentation program and a viewpoint place candidate presentation device for presenting an appropriate candidate point as a viewpoint place using a computer.

The present invention provides, as a first viewpoint field candidate presentation program,
A viewpoint field for causing a computer including storage means for storing three-dimensional terrain model data including horizontal coordinates and vertical coordinates for a plurality of points including the viewing target, and a display field to present a viewpoint candidate for the viewing target to a computer; A candidate presentation program,
From the three-dimensional terrain model data, a first horizontal coordinate that is the horizontal coordinate of the point corresponding to a first designated point on the viewing target, and a first horizontal coordinate of the point corresponding to a second designated point on the viewing target. A position extraction step of extracting a second horizontal coordinate which is a horizontal coordinate;
On a two-dimensional coordinate system composed of the horizontal coordinates of the plurality of points included in the three-dimensional terrain model data, a circular arc having both ends of the first horizontal coordinate and the second horizontal coordinate, and a circumferential angle An arc specifying step of specifying an arc equal to a predetermined angle set in advance,
A candidate point identification step of identifying the point having the coordinates of one point on the arc as the horizontal coordinate as a candidate point,
A specific landscape display step of causing the computer to execute a specific landscape display step of displaying a landscape when the direction of the visual target is viewed from the candidate point on the display unit based on the three-dimensional terrain model data. Provide a place candidate presentation program.

Also, the present invention is a first viewpoint place candidate presenting program as a second viewpoint place candidate presenting program,
An initial landscape display step of displaying a landscape including the viewing target viewed from a preset viewpoint on the display unit based on the three-dimensional terrain model data;
A viewpoint field candidate presenting program is provided which further executes, before the position extracting step, both end designation steps for accepting designation of the first designated point and the second designated point on the viewing target on the displayed landscape. .

Further, the present invention is a first or second viewpoint place candidate presenting program as a third viewpoint place candidate presenting program,
The arc specifying step includes:
Based on the three-dimensional terrain model data, identifying a plurality of points having the coordinates of the points constituting the arc as horizontal coordinates,
Displaying a line passing through the specified points on the landscape including the viewing target on the display means in a state where the lines pass through the plurality of points.

Further, the present invention is a viewpoint viewpoint candidate presenting program according to any one of the first to third viewpoints as a fourth viewpoint scene candidate presenting program,
The candidate point identification step includes:
Displaying an operation unit on the display means;
Recognizing the one point on the arc as a selected point according to the operation of the operation unit;
Specifying a point corresponding to the selected point as the candidate point based on the three-dimensional terrain model data.

Also, the present invention is a fourth viewpoint field candidate presenting program as a fifth viewpoint field candidate presenting program,
In the candidate point specifying step, the operation unit is movable on the display unit, and when the operation unit is moved, the selected point continuously changes, whereby the candidate point is also changed. Change continuously,
In the specific scene display step, a viewpoint place candidate presenting program is provided, in which the specific landscape displayed on the display means also changes continuously according to the continuous change of the candidate point.

Also, the present invention is a fifth viewpoint place candidate presenting program as a sixth viewpoint place candidate presenting program,
In the candidate point specifying step, the movement of the operation unit includes a line connecting the target point and the selected point corresponding to a specific point on the target on the two-dimensional coordinate system, and the first horizontal coordinate. A viewpoint field candidate presentation program that corresponds to a change in an incident angle, which is an angle formed with a line connecting the second horizontal coordinate, and in which the selected point continuously changes according to a continuous change in the incident angle. provide.

Furthermore, the present invention is a viewpoint place candidate presenting device that presents viewpoint viewpoint candidates for a viewing target as a viewpoint place candidate presenting device,
Storage means for storing three-dimensional terrain model data including horizontal coordinates and vertical coordinates for a plurality of points including the viewing target,
Display means;
From the three-dimensional terrain model data, first horizontal coordinates that are the horizontal coordinates of the point corresponding to the first specified point of the viewing target, and the horizontal coordinates of the point corresponding to the second specified point of the viewing target Position extracting means for extracting a second horizontal coordinate which is
On a two-dimensional coordinate system composed of the horizontal coordinates of the plurality of points included in the three-dimensional terrain model data, a circular arc having both ends of the first horizontal coordinate and the second horizontal coordinate, and a circumferential angle Arc specifying means for specifying an arc equal to a predetermined angle set in advance,
Candidate point specifying means for specifying the point having the coordinates of one point on the arc as the horizontal coordinates as a candidate point,
A viewpoint scene candidate presentation device comprising: a specific scene display unit that displays a scene when the direction of the viewing target is viewed from the candidate point on the display unit based on the three-dimensional terrain model data as a specific scene. I do.

  A viewpoint field candidate presenting program according to the present invention is a computer-readable storage medium storing, on a two-dimensional coordinate system, an arc having a point corresponding to a first specified point and a second specified point on a viewing target as both ends and having a circumferential angle equal to a predetermined angle. To be specified. In addition, the viewpoint place candidate presentation program specifies a point on the specified arc as a candidate point, and causes the display unit to display a landscape image including a viewing target viewed from the specified candidate point. Thus, the landscape image from the candidate point can be confirmed without conducting a field survey, which can contribute to selection and presentation of the viewpoint viewpoint candidate point.

It is a block diagram showing composition of a viewpoint place candidate presentation device by a 1st embodiment of the present invention. 3 is a flowchart for explaining the operation of the viewpoint place candidate presentation device of FIG. 1. 3 is a flowchart illustrating details of an arc specifying step included in the flowchart of FIG. 2. 3 is a slow chart illustrating details of a candidate point specifying step included in the flowchart of FIG. 2. FIG. 2 is a diagram showing an example of an initial landscape image displayed on a display unit of the viewpoint place candidate presenting apparatus of FIG. 1 and an example of a menu bar displayed in a state of being superimposed on the initial landscape image. FIG. 2 is a diagram for describing designation of a first designated point and a second designated point performed in the viewpoint place candidate presentation device of FIG. 1. The figure which shows an example of the normal scenery image displayed on the display part of the viewpoint place candidate presentation apparatus of FIG. 1, and the menu bar, the viewpoint place candidate line, the arrow, and the arrow operation panel displayed in the state superimposed on the normal scenery image. It is. It is a figure which shows an example of the menu bar and arrow operation panel displayed in the state superimposed on the specific scenery image and the specific scenery image displayed on the display part of the viewpoint place candidate presentation device of FIG. FIG. 3 is a diagram for explaining a circumferential angle α, a horizontal projection angle β, and an incident angle γ.

  Referring to FIG. 1, a viewpoint candidate presenting apparatus 10 according to an embodiment of the present invention includes an input unit (input unit) 110, a control unit 120, a storage unit (storage unit) 130, and a display unit (display). Means 140). The viewpoint place candidate presentation device 10 may be configured as a dedicated device, or may be configured to operate a computer as the viewpoint place candidate presentation device 10. When the computer is operated as the viewpoint place candidate presentation device 10, the computer may be made to read and execute the viewpoint place candidate presentation program. The type of the computer is not particularly limited, and may be any of a desktop type, a notebook type, a tablet terminal type, and the like.

  The input unit 110 is not particularly limited, but a known input device such as a keyboard and a mouse can be used. The input unit 110 may be integrated with the display unit 140 like a touch screen.

  The control unit 120 is connected to the input unit 110, the storage unit 130, and the display unit 140, and performs predetermined information processing and displays based on an input signal from the input unit 110 and a program and data stored in the storage unit 130. The display control of the unit 140 is performed. The control unit 120 functions as at least a position extracting unit, an arc specifying unit, a candidate point specifying unit, and a specific scene display unit, as described later.

  The storage unit 130 stores a program and predetermined data necessary for the operation as the viewpoint place candidate presenting apparatus 10. The predetermined data includes three-dimensional terrain model data representing a terrain model including a viewing target. Specifically, in the present embodiment, the “terrain model” is a model that represents not only the shape of the ground surface (terrain) but also the shape of an object (building, tree, or the like) existing on the ground surface. Further, in the present embodiment, the “viewing target” assumes a building such as a dam or a bridge that has not been built yet. In other words, the terrain model according to the present embodiment assumes that a building to be viewed is arranged at the planned construction site, and models the viewing target and surrounding conditions (terrain, buildings, trees, etc.). It was done. However, the present invention is not limited to this. The viewing target may be a building that has already been built or may be something other than a building. The three-dimensional terrain model data includes information (horizontal coordinates, vertical coordinates) on the position and height of each part of the viewing target and the positions and heights of a plurality of points on the topographic map. The plurality of points on the topographic map may be regularly arranged points. For example, the plurality of points on the topographic map may be points on a grid arranged at equal intervals. Such three-dimensional terrain model data representing a terrain model can be created based on three-dimensional data representing a visual target, topographic map data, aerial laser survey data (LP (Laser Profile) data), and the like.

  The display unit 140 includes a display device that can display an image, such as a liquid crystal panel. The display unit 140 displays a part (or all) of the terrain model, that is, a landscape image (landscape) based on the three-dimensional terrain model data under the control of the control unit 120. The display of the landscape image can be performed as if viewing an arbitrary direction from an arbitrary place. At this time, the height of the viewpoint is not particularly limited, but can be set to a height of about 1 to 1.5 m from the ground surface. The display unit 140 also displays information necessary for an input operation from the input unit 110, such as various operation buttons (GUI (Graphical User Interface) buttons) and a pointer, under the control of the control unit 120.

  With reference to FIG. 2 in addition to FIG. 1, the operation of the viewpoint field candidate presenting apparatus 10 will be described. First, the control unit 120 causes the display unit 140 to display a landscape image (initial landscape image) including a building to be viewed in response to an input signal from the input unit 110 (step S201). More specifically, the control unit 120 reads from the storage unit 130 three-dimensional terrain model data representing a three-dimensional terrain model including a viewing target specified by an input signal from the input unit 110. Then, based on the read three-dimensional terrain model data, control unit 120 causes display unit 140 to display an initial landscape image according to preset initial display conditions. The display conditions are set so that the entire building to be viewed is included in the landscape image. Thereby, the initial landscape image including the preset viewing target is displayed on the display unit 140.

  Referring to FIG. 5, an initial landscape image 500 displayed on the display unit 140 depicts a river 502, trees 504, a house 506, and a bridge as a building to be viewed 510. The building (bridge) that is the viewing target 510 is drawn so as to include the entirety. In the present embodiment, menu bar 520 is displayed in a state where it is superimposed on initial landscape image 500. The menu bar 520 includes one or more GUI buttons 522 for instructing an operation that can be executed at that time and an execution / selection of a selectable mode. Although not shown in FIG. 5, a pointer (not shown) used for operating the GUI button 522 and the like is also displayed on the display screen of the display unit 140.

  Returning to FIG. 2, the control unit 120 accepts designation of a first designated point and a second designated point for the viewing target 510 by an operation from the input unit 110 (step S202). If the first designated point and the second designated point are designated (Y in step S202), the corresponding point is specified as described later, and if not, the initial landscape display is continued (N in step S202). Here, the transition to the designation accepting mode for accepting designation of the first designated point and the second designated point may be performed automatically at the same time as the initial landscape image 500 is displayed, or the initial landscape image 500 is displayed. Thereafter, the operation may be performed in accordance with the operation of the input unit 110. Prior to the designation of the first designated point and the second designated point, an operation of moving the viewpoint of the initial landscape image 500 displayed on the display unit 140 and changing the size and direction of the viewing target 510 (viewpoint moving operation) May be performed. This is because the initial landscape image 500 is not always suitable for designating the first designated point and the second designated point. In the present embodiment, the viewpoint moving operation can be performed by operating the GUI button 522 displayed on the display unit 140 and shifting to the viewpoint moving mode. In the following description, both the initial landscape image 500 and the landscape image created by moving the viewpoint of the initial landscape image 500 will be referred to as a normal landscape image.

  As shown in FIG. 6, it is assumed that the first designated point 610 and the second designated point 620 are designated by an operation from the input unit 110 in a state where the normal landscape image 600 is displayed on the display unit 140. . This designation is performed by moving a pointer (not shown) displayed on the normal landscape image 600 to an arbitrary point on the image, and pressing at least one of an operation button (a physical switch such as a mouse button) and an input key. It can be performed by operating. As this operation, for example, a combination of a “Ctrl” key on a keyboard and a “right button” on a mouse can be used. If the input unit 110 is a touch screen integrated with the display unit 140, it can be realized by a tap operation or the like. In the present embodiment, it is assumed that the left end of viewing target 510 is specified as first specified point 610, and the right end of viewing target 510 is specified as second specified point 620. In other words, the control unit 120 recognizes that the first designated point 610 is the horizontal left end of the viewing target 510 and the second specified point 620 is the horizontal right end of the viewing target 510.

  Returning to FIG. 2 again, when receiving an operation of designating the first designated point 610 and the second designated point 620 (Y in step S202), the control unit 120 designates the designated first designated point 610 and second designated point. The horizontal coordinates of the points respectively corresponding to 620 are extracted from the three-dimensional terrain model data as the first horizontal coordinates and the second horizontal coordinates (step S203). Thus, the control unit 120 functions as a position extracting unit.

  Next, the control unit 120 extracts the extracted first horizontal coordinates and second horizontal coordinates on a two-dimensional coordinate system (horizontal coordinate system) constituted by the horizontal coordinates of a plurality of points included in the three-dimensional terrain model data. An arc (reference arc) whose coordinates are both ends and whose circumferential angle is equal to a predetermined angle α is specified (step S204). Thus, the control unit 120 also functions as an arc specifying unit. The predetermined angle α is set on the basis of the horizontal prospect angle β, as described later.

  As shown in FIG. 3, in the arc specifying step S <b> 204, the control unit 120 performs the following processing after performing the calculation processing for specifying the reference circular arc (step S <b> 301). First, the control unit 120 specifies a point having the coordinates of a plurality of points constituting the reference arc as horizontal coordinates based on the three-dimensional terrain model data (step S302). Next, as shown in FIG. 7, the control unit 120 displays a normal landscape image 600 (in this embodiment, a line (viewpoint candidate line)) 710 displayed on the display unit 140 through a plurality of specified points. It is displayed in a state of being superimposed on the same (same as the initial landscape image 500) (step S303). In addition, in order to reduce the load of the arithmetic processing in the control unit 120, the reference arc may be displayed as it is instead of the viewpoint field candidate line 710.

  In FIG. 7, the viewpoint field candidate line 710 is located below the line connecting the first designated point 610 and the second designated point 620 (on the near side of the viewing target 510). This is because the control unit 120 recognizes that the first specified point 610 corresponds to the left end of the viewing target 510 and the second specified point 620 corresponds to the right end of the viewing target, as described above. . Therefore, assuming that the first designated point 610 is located on the right side of the second designated point 620 in FIG. 6, the viewpoint field candidate line 710 to be drawn is composed of the first designated point 610 and the second designated point 620 (upper side of the viewing target 510). When the first designated point 610 is located above the second designated point 620 on the ordinary landscape image 600, the viewpoint field candidate line 710 is defined by a straight line connecting the first designated point 610 and the second designated point 620. Is also located on the left. Conversely, when the first designated point 610 is located below the second designated point 620 in the normal landscape image 600, the viewpoint field candidate line 710 is a straight line connecting the first designated point 610 and the second designated point 620. Located to the right of

  As described above, in the present embodiment, by simply designating two points on the viewing target 510 displayed on the display unit 140, the viewpoint field candidate line 710 useful for selecting an appropriate viewpoint field is superimposed on the landscape image. Can be displayed. Moreover, since the reference arc is specified based only on the horizontal coordinates of the designated first and second designated points 610 and 620, the amount of calculation processing in the control unit 120 can be reduced.

  Referring to FIG. 2 again, after displaying the viewpoint field candidate line 710 on the display unit 140, the control unit 120 specifies the viewpoint field candidate point (step S205). Then, the control unit 120 creates a landscape image in the case where the viewing target 510 is seen from the identified viewpoint candidate point based on the three-dimensional terrain model data, and generates the specific landscape image as shown in FIG. 800 is displayed on the display unit 140 (step S206). As described above, the control unit 120 functions as a specific landscape display unit.

  Referring to FIG. 4, the viewpoint place candidate point specifying step S205 will be described in detail. The control unit 120 displays the viewpoint field candidate line 710 on the display unit 140 (see FIG. 1) or simultaneously displays the viewpoint field candidate line 710 on the display unit 140, and then sets the candidate point selection operation unit to the normal scenery. In a state where the image is superimposed on the image 600, the display unit 140 displays the candidate field along with the viewpoint field candidate line 710 (step S401). In the present embodiment, as a candidate point selection operation unit, as shown in FIG. 7, from one point on the viewpoint field candidate line 710 to a specific point on the visual target 510 (the visual target point 720, for example, the center of gravity of the visual target 510, ) And an arrow operation panel 740 including an incident angle slider (operation unit) 742 for operating the arrow 730 are displayed on the display unit 140. The arrow 730 and the incident angle slider 742 are interlocked with each other, and can be continuously moved on the screen of the display unit 140. Specifically, the arrow 730 can be continuously moved within a predetermined range along the viewpoint field candidate line 710. Regardless of the position of the arrow 730, the rear end 732 of the arrow 730 is always located on the viewpoint field candidate line 710, and the tip 734 of the arrow 730 goes to the viewing target point 720.

  Referring to FIG. 9, on the horizontal coordinate system, a line segment 930 connecting the rear end 732 of the arrow 730 and the first horizontal coordinate 910 (corresponding to the first designated point 610), the rear end 732 of the arrow 730 and the second An angle β formed by a line segment 940 connecting the horizontal coordinate 920 (corresponding to the second designated point 620) is called a horizontal projection angle. In the horizontal coordinate system, a line segment 950 connecting the arrow 730 and the viewing target point 720 forms a perpendicular to a line segment 960 connecting the first horizontal coordinate 910 and the second horizontal coordinate 920 (corresponding to the viewing target 510). The angle γ is called a line-of-sight incident angle (incident angle). The horizontal prospect angle β is expressed by β = 180−α (degrees) using the circumferential angle α of the reference arc 900 (corresponding to the viewpoint field candidate line 710). Horizontal prospect angle β is constant regardless of where rear end 732 of arrow 730 is located on reference arc 900. In other words, even if the arrow 730 moves along the reference arc 900 and thereby changes the line-of-sight incident angle γ, the horizontal apparent angle β does not change. In the present embodiment, the circumferential angle α is set to a predetermined value in the range of 120 ° ≦ α ≦ 160 ° such that the value of the horizontal prospect angle β is 20 ° ≦ β ≦ 60 °. If the horizontal projection angle β is less than 20 °, the building to be viewed 510 becomes too small in the landscape image, making it difficult to recognize as a viewing target. Also, if the horizontal projection angle β exceeds 60 °, the building to be viewed 510 becomes large enough to protrude from the landscape image and becomes inappropriate as a viewing target.

  In the present embodiment, the set horizontal appearance angle β does not always match the horizontal appearance angle in the landscape image. That is, in the present embodiment, the rear end 732 of the arrow 730 is not on the reference arc 900 but on the viewpoint field candidate line 710, and the vertical coordinates of each point on the viewpoint field candidate line 710 are not necessarily the same. This is because they do not match (each point has a height difference). The difference between the set horizontal projection angle β and the horizontal projection angle in the landscape image is often small enough to be ignored. However, when the height difference between the points is large, the set horizontal viewing angle β may be significantly different from the horizontal viewing angle in the landscape image. Therefore, in the present embodiment, the angle (elevation angle and dip angle) formed by the arrow 730 and the horizontal plane in the arrow operation panel 740 as an index indicating the difference between the set horizontal projection angle β and the horizontal projection angle in the landscape image. Are provided (see FIGS. 7 and 8).

  Referring to FIG. 4 again, control unit 120 receives a selection point selection operation (Y in step S402), and specifies a point (viewpoint candidate point) corresponding to the selected selection point (step S403). . The selection of the selection point is performed by moving the arrow 730 on the normal landscape image 600. The movement of the arrow 730 may be performed by directly operating the arrow 730 or operating the incident angle slider 742 on the image displayed on the display unit 140. The operation of the arrow 730 or the incident angle slider 742 can be performed by a combination of the operation of a pointer (not shown) and the operation of a physical switch or an input key. The movement of the incident angle slider 742 corresponds to a change in the line-of-sight incident angle γ. In the present embodiment, the line-of-sight incident angle γ can take a value in the range of −90 ° to + 90 °, where the incident angle near the first horizontal coordinate 910 is negative and the incident angle near the second horizontal coordinate 920 is positive. (See FIG. 9).

  In step S402, the control unit 120 detects the position of the rear end 732 of the arrow 730, and recognizes the detection result as the position of the selected point. To simplify the processing, the control unit 120 detects the rear end 732 of the arrow 730 on the horizontal coordinate system. In other words, the control unit 120 detects only the horizontal coordinates of the rear end 732 of the arrow 730 and does not detect the vertical coordinates. This is equivalent to detecting the position assuming that the rear end 732 of the arrow 730 moves on the reference arc 900. In this case, the control unit 120 recognizes one point on the reference arc 900 as a selected point according to the position of the rear end 732 of the arrow 730.

  In step S403, the control unit 120 specifies the coordinates of the point corresponding to the horizontal coordinates of the selected point based on the three-dimensional terrain model data, and sets the coordinates as the viewpoint candidate point. Thus, the control unit 120 also functions as a candidate point designation unit.

  Next, the control unit 120 determines the display mode (step S404), and performs the normal landscape display (step S405) or the specific landscape display (step S206) according to the display mode.

  Thereafter, steps S402 to S405 (or S206) are repeated. By repeating steps S402 to S405 (or S206), the selection of the selected point and the specification of the point corresponding to the horizontal coordinate of the selected point are periodically repeated. When the detected horizontal coordinate of the rear end 732 of the arrow 730 is different from the previously detected horizontal coordinate, the control unit 120 determines that the selected point is newly selected (Y in step S402), and determines the corresponding point in the viewpoint field. It is specified as a candidate point (step S403). On the other hand, when the detected horizontal coordinates of the rear end 732 of the arrow 730 match the previously detected horizontal coordinates, the control unit 120 determines that the selection point has not been selected (N in step S402). Thus, when the incident angle slider 742 is continuously operated, and thereby the rear end 732 of the arrow 730 continuously moves on the reference arc 900, the selection point recognized by the control unit 120 also changes continuously. Further, as the selected point changes continuously, the viewpoint place candidate point also changes continuously.

  The display mode can be changed by operating the viewpoint movement button 744 included in the arrow operation panel 740. In the initial state, the control unit 120 causes the display unit 140 to perform the normal landscape display, and continues the normal landscape display unless the operation of the viewpoint moving button 744 is operated (step S405). When the incident angle slider 742 is operated in this state, the control unit 120 changes the display position of the arrow 730 accordingly. In this case, the landscape image including the viewing target 510 does not change. On the other hand, when the viewpoint moving button 744 is operated, the display mode is changed, and the control unit 120 causes the display unit 140 to perform the specific landscape display (step S206). As understood from FIGS. 7 and 8, the viewpoint in the specific scenery display is located on the viewpoint candidate line 710. In the specific scene display, the viewpoint field candidate line 710 and the arrow 730 are not displayed on the display unit 140. When the incident angle slider 742 is operated in this state, the control unit 120 changes the viewpoint (the line-of-sight incident angle γ) accordingly. That is, the landscape image including the viewing target 510 changes according to the change in the viewing angle γ. By continuously operating the incident angle slider 742, the viewpoint of the specific scenery image 800 displayed on the display unit 140 can be continuously changed. Thereafter, when the viewpoint moving button 744 is operated again, the control unit 120 changes the display mode and causes the display unit 140 to perform the normal landscape display.

  As described above, in the viewpoint place candidate presenting apparatus 10 of the present embodiment, the selection of the viewpoint place candidate point and the confirmation of the scenery from the viewpoint place candidate point are repeatedly performed by switching between the normal landscape display and the specific landscape display. be able to. Thereby, the viewpoint place candidate presentation device 10 can contribute to the selection and presentation of the viewpoint place candidate points.

  When the GUI button 522 included in the menu bar 520 is operated by the operation from the input unit 110 and the viewpoint field registration is commanded, the control unit 120 displays the specific landscape image 800 displayed on the display unit 140 at that time. The horizontal coordinates and the vertical coordinates of the point (viewpoint candidate point) corresponding to the viewpoint are specified, and the specified horizontal coordinates and vertical coordinates (position information) are registered in the viewpoint field candidate list stored in the storage unit 130. The position information registered in the viewpoint field candidate list is read out later and used for presenting the viewpoint field candidates. The viewpoint field candidates can be presented by displaying a mark indicating the position on the display unit 140 in a state of being superimposed on the normal landscape image 600, the bird's-eye image, or the topographic map. Further, by changing the display mode, it is also possible to perform a specific landscape display in which one of the viewing targets 510 is seen from the registered viewpoint viewpoint candidate point.

  In the present embodiment, not only the incident angle slider 742 but also a horizontal projection angle slider 746 is provided on the arrow operation panel 740. The horizontal prospect angle slider 746 is for changing the horizontal prospect angle β from the initial value to another value. In the present embodiment, the horizontal projection angle β can be changed within a range of 20 ° ≦ β ≦ 60 °. When the horizontal projection angle β is changed by operating the horizontal projection angle slider 746, the diameter of the reference arc 900 (viewpoint candidate line 710) changes. Specifically, the diameter of the reference arc 900 decreases when the horizontal projection angle β increases, and the diameter of the reference arc 900 increases when the horizontal projection angle β decreases. By changing the horizontal projection angle β in this manner, the distance between the viewing target point 720 and the arrow 730 can be changed without changing the line-of-sight incident angle γ. This increases the degree of freedom in selecting viewpoint viewpoint candidate points. The diameter of the viewpoint field candidate line 710 can be similarly changed by directly operating the arrow 730.

  As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the above embodiment, and various changes and modifications are possible. For example, in the above embodiment, the line-of-sight incident angle β is changed by operating the incident angle slider 742. However, an incident angle input field may be provided to input a numerical value.

  Also, in the present embodiment, two GUI groups of the menu bar 520 and the arrow operation panel 740 are displayed as GUIs, but these may be integrated or divided into more GUI groups.

  Further, in the present embodiment, since the main focus is on displaying a landscape image based on a terrain model, no change is made to the landscape image. However, a change may be made to the landscape image displayed on the display unit 140, or the change may be undone. In this case, the changed landscape image may be stored in the storage unit 130. Accordingly, for example, when a tree is present between the viewpoint and the viewing target 510 while the specific landscape image 800 is displayed, the tree is removed or the height of the tree is changed. It is possible to select a viewpoint place while checking the landscape of the city.

10 viewpoint field candidate presentation device 110 input unit (input means)
120 control unit 130 storage unit (storage means)
140 display unit (display means)
500 Initial landscape image 510 View target 520 Menu bar 522 GUI button 600 Normal landscape image 610 First designated point 620 Second designated point 710 Line (viewpoint candidate line)
720 Specific point (viewing point)
730 Arrow 732 Rear end 734 Front end 740 Arrow operation panel 742 Incident angle slider (operation unit)
744 View point movement button 746 Horizontal prospect angle slider 748 Elevation angle display field 800 Specific landscape image 900 Reference arc 910 First horizontal coordinate 920 Second horizontal coordinate 930, 940, 950, 960 Line segment

Claims (7)

A viewpoint field for causing a computer including storage means for storing three-dimensional terrain model data including horizontal coordinates and vertical coordinates for a plurality of points including the viewing target, and a display field to present a viewpoint candidate for the viewing target to a computer; A candidate presentation program,
From the three-dimensional terrain model data, a first horizontal coordinate that is the horizontal coordinate of the point corresponding to a first designated point on the viewing target, and a first horizontal coordinate of the point corresponding to a second designated point on the viewing target. A position extraction step of extracting a second horizontal coordinate which is a horizontal coordinate;
On a two-dimensional coordinate system composed of the horizontal coordinates of the plurality of points included in the three-dimensional terrain model data, a circular arc having both ends of the first horizontal coordinate and the second horizontal coordinate, and a circumferential angle An arc specifying step of specifying an arc equal to a predetermined angle set in advance,
A candidate point identification step of identifying the point having the coordinates of one point on the arc as the horizontal coordinate as a candidate point,
A specific landscape display step of causing the computer to execute a specific landscape display step of displaying a landscape when the direction of the visual target is viewed from the candidate point on the display unit based on the three-dimensional terrain model data. Place candidate presentation program. The viewpoint field candidate presentation program according to claim 1,
An initial landscape display step of displaying a landscape including the viewing target viewed from a preset viewpoint on the display unit based on the three-dimensional terrain model data;
A viewpoint field candidate presentation program that further executes, before the position extraction step, both end designation steps for accepting designation of the first designated point and the second designated point on the viewing target on the displayed landscape. A viewpoint field candidate presenting program according to claim 1 or claim 2,
The arc specifying step includes:
Based on the three-dimensional terrain model data, identifying a plurality of points having the coordinates of the points constituting the arc as horizontal coordinates,
Displaying on the display means in a state where lines passing through the specified points are superimposed on the landscape including the viewing target. A viewpoint field candidate presentation program according to any one of claims 1 to 3,
The candidate point identification step includes:
Displaying an operation unit on the display means;
Recognizing the one point on the arc as a selected point according to the operation of the operation unit;
Specifying the point corresponding to the selected point as the candidate point based on the three-dimensional terrain model data. A viewpoint field candidate presentation program according to claim 4,
In the candidate point specifying step, the operation unit is movable on the display unit, and when the operation unit is moved, the selected point continuously changes, whereby the candidate point is also changed. Change continuously,
A viewpoint place candidate presenting program in which the specific scene displayed on the display means also changes continuously in the specific scene display step in accordance with a continuous change of the candidate point. It is a viewpoint place candidate presentation program of Claim 5, Comprising:
In the candidate point specifying step, the movement of the operation unit includes a line connecting the target point and the selected point corresponding to a specific point on the target on the two-dimensional coordinate system, and the first horizontal coordinate. A viewpoint field candidate presenting program which corresponds to a change in an incident angle, which is an angle formed by a line connecting the second horizontal coordinate, and wherein the selected point continuously changes in accordance with a continuous change in the incident angle. A viewpoint field candidate presentation device that presents candidates for a viewpoint field for a viewing target,
Storage means for storing three-dimensional terrain model data including horizontal coordinates and vertical coordinates for a plurality of points including the viewing target,
Display means;
From the three-dimensional terrain model data, first horizontal coordinates that are the horizontal coordinates of the point corresponding to the first specified point of the viewing target, and the horizontal coordinates of the point corresponding to the second specified point of the viewing target Position extracting means for extracting a second horizontal coordinate which is
On a two-dimensional coordinate system composed of the horizontal coordinates of the plurality of points included in the three-dimensional terrain model data, a circular arc having both ends of the first horizontal coordinate and the second horizontal coordinate, and a circumferential angle Arc specifying means for specifying an arc equal to a predetermined angle set in advance,
Candidate point specifying means for specifying the point having the coordinates of one point on the arc as the horizontal coordinates as a candidate point,
A viewpoint scene candidate presentation device comprising: a specific scene display unit configured to display a scene when a direction in which the viewing target is viewed from the candidate point as a specific scene on the display unit based on the three-dimensional terrain model data.