Topographical plan view display system and topographical plan view display method

Abstract

To provide a geographic plane view display system that can intuitively grasp a degree of a slope in comparison with a conventional art, and to provide a geographic plane view display device that uses the geographic plane view display system.SOLUTION: A geographic plane diagram display system of the present invention is the system that displays a geographic plane view having a display color in accordance with a degree of a geographic slope colored, and comprises: literary word display control means; and geographic plane view display control means. The literary word display control means is means that causes literary words composed of a plurality of individual areas to display, in which the individual area is an area corresponding to respective slope angel ranges, and is formed including a slope part sloped at an upper limit angle of respective slope angle ranges. The literary word display control means is configured to display the individual areas in different individual display colors and in the same display color.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technology for displaying topographical plan views, and more specifically to a topographical plan view display system capable of displaying topographical plan views together with intuitive and easy-to-understand legends, and a topographical plan view display method using the same. [Background technology]

[0002] When conducting topographical surveys over a wide area, such as creating topographical maps, it was traditionally common to use aerial photographs taken from aircraft. However, in recent years, various measurement methods have been put into practical use, such as airborne laser measurement, measurement using satellite photographs, and measurement using synthetic aperture radar, making it possible to select the most appropriate method depending on the situation.

[0003] Of these, aerial photogrammetry (also known as aerial photogrammetry) generally uses a pair of photographs (a so-called stereo pair) to determine the three-dimensional coordinates (X, Y, Z) of the subject in real space by recreating the state in which each photograph was taken. Specifically, values ​​such as the coordinates of the projection center (center of the camera lens), camera tilt, focal length, and coordinates on the photograph (x, y) are determined for each of the two photographs, and real-space coordinates are calculated based on these values. The projection center coordinates, expressed as three-dimensional coordinates (X, Y, Z), and the camera tilt, expressed as tilt angles (ω, φ, κ) from the three axes, are called exterior orientation parameters and are essential elements for aerial photogrammetry. In recent years, it has become common to obtain exterior orientation parameters using positioning methods such as GNSS (Global Navigation Satellite System) and inertial measurement methods such as IMU (Inertial Measurement Unit).

[0004] On the other hand, airborne laser measurement involves flying an aircraft over the terrain to be measured and receiving the reflected signal of a laser pulse emitted onto the terrain. More specifically, the distance from the irradiation position to the measurement point (the point where the laser pulse is reflected) is calculated by measuring the time difference between the time of irradiation and the time of reception, and the irradiation position (x, y, z) of the laser pulse is obtained using a positioning method such as GNSS, and the irradiation attitude (ω, φ, κ) is obtained using an inertial measurement method such as an IMU, thereby obtaining the three-dimensional coordinates of the measurement point.

[0005] In any case, the results obtained by topographical surveying are a large number of measurement points (so-called point clouds) that indicate arbitrary points on the terrain, and naturally these measurement points have three-dimensional coordinates. Here, three-dimensional coordinates refer to the coordinates of points located in a Cartesian coordinate system consisting of three orthogonal axes, the X-axis, the Y-axis, and the Z-axis, or in a geodetic coordinate system expressed by latitude, longitude, and altitude. In other words, they are the coordinates of points located in a three-dimensional coordinate system that combines a planar coordinate system (XY or latitude and longitude) located on a horizontal plane with vertical coordinate axes.

[0006] Since the 3D coordinates of a point cloud are merely numerical values, a terrain model is usually created based on the point cloud. Typical examples of such terrain models are DEM (Digital Elevation Model) and DSM (Digital Surface Model). Although terrain models can be expressed as three-dimensional shapes because they are based on the 3D coordinates of a point cloud, they are usually displayed on a monitor or on paper, meaning that terrain models are mainly displayed in two dimensions (on a flat surface).

[0007] When a 3D terrain model is displayed in 2D, it is difficult to see the height value (elevation) when projected onto a horizontal plane, and it is difficult to see the depth position when projected onto a vertical plane. Conventionally, the method of expressing height on a flat surface has generally been to use contour lines, but this requires some specialized knowledge and is difficult to grasp intuitively, and a certain amount of experience is required, especially to read the slope of the terrain (the interval between contour lines).

[0008] Therefore, various technologies have been proposed to enable intuitive understanding of elevation and slope even in a two-dimensional terrain model. For example, Patent Document 1 discloses an invention that displays a terrain plan view in a color corresponding to elevation and in a grayscale corresponding to slope. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 4771459 Summary of the Invention [Problem to be solved by the invention]

[0010] When the elevation of a topographical plan view is indicated by a color and the slope by a shading, as in the invention disclosed in Patent Document 1, a legend showing the correspondence between the elevation range and the color and the slope range and the shading are typically displayed together with the topographical plan view. In this case, a slide bar, such as that shown in FIG. 11(a), has sometimes been used to represent the slope legend. Alternatively, the slope of the topographical plan view may be indicated by a color, in which case a legend showing the correspondence between the slope range and the color, such as that shown in FIG. 11(b), has sometimes been used. However, the legends shown in FIGS. 11(a) and 11(b), make it difficult to intuitively grasp the actual slope. For example, even if the slope legend indicates the slope angle numerically, intuitively grasping the degree of the angle requires the use of a separate protractor, which not only hinders rapid understanding but also creates inconvenience.

[0011] The object of the present invention is to solve the problems associated with the prior art, namely, to provide a topographical plan view display system that allows users to intuitively grasp the degree of inclination compared to the prior art, and a topographical plan view display method using the same. [Means for solving the problem]

[0012] The present invention focuses on the point that a legend including the inclination according to the actual angle is displayed together with a topographical plan view, and is an invention based on an idea that has not been seen before.

[0013] The topographical plan view display system of the present invention displays a topographical plan view with a display color according to the degree of slope of the terrain, and includes a legend display control means and a topographical plan view display control means. The legend display control means displays a legend consisting of a plurality of individual regions, and the topographical plan view display control means displays the topographical plan view. Each individual region corresponds to a slope angle range, and each individual region includes an inclined portion that slopes at the upper limit angle of the slope angle range. The legend display control means displays each individual region in the same display color as the individual display color.

[0014] The topographical plan view display system of the present invention can also display a display color for each of a plurality of small areas that make up the topographical plan view. In this case, a terrain inclination angle is assigned to each small area of ​​the topographical plan view, and the topographical plan view display control means displays the small areas in the same display color as the individual display color of each individual area related to the inclination angle range that includes the terrain inclination angle of the small area.

[0015] The topographical plan view display system of the present invention can also be configured so that the entire legend area is composed of individual triangular areas. The entire legend area is a triangular area consisting of an overall base, an overall opposite side, and an overall hypotenuse, and the vertex formed by the overall base and the overall hypotenuse is the starting point. In this case, the legend display control means displays the individual areas by arranging them so that they divide the overall opposite side, do not overlap each other, and one of their vertices coincides with the starting point of the entire area. Alternatively, the individual areas can be displayed by arranging them so that they divide the overall base, do not overlap each other, and one of their vertices coincides with the starting point of the entire area.

[0016] In the topographical plan view display system of the present invention, each individual area may be formed by an individual base, an individual opposite side, and an individual oblique side. However, the individual oblique side of each individual area constitutes an inclined portion. In this case, the legend display control means displays each individual area so that the individual base is inclined at the lower limit angle of the inclination angle range.

[0017] The topographical plan view display system of the present invention can also display each individual area as a bird's-eye view of a columnar body. This columnar body has a continuous columnar shape in side view (e.g., a triangular column) and is composed of a horizontal individual base surface, vertical individual facing surfaces, and individual sloped surfaces that form inclined portions. Furthermore, the individual sloped surfaces of the columnar body are straight (or curved) according to the upper limit angle in side view, and the dimensions (heights) of the individual facing surfaces of the columnar body in side view can all be the same. Alternatively, the dimensions (lengths) of the individual bases of the columnar body in side view can all be the same.

[0018] The topographical plan view display system of the present invention can also individually select individual areas to be displayed or hidden by the legend display control means.

[0019] The topographical plan display method of the present invention is a method for displaying a topographical plan view, with a legend, in which display colors are assigned according to the degree of slope of the terrain. More specifically, individual areas are displayed in different individual display colors, and an individual area is selected by comparing the terrain slope angle of the small area with a slope angle range, and the small area is displayed in the individual display color of the selected individual area. [Effects of the Invention]

[0020] The topographical plan view display system and topographical plan view display method of the present invention have the following advantages. (1) Compared to conventional techniques, the degree of inclination of a topographical plan view can be intuitively grasped. (2) As a result, even those without the appropriate knowledge or experience can easily read topographic maps. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a model diagram showing a topographical plan view and a legend displayed on a display means by a topographical plan view display system. [Figure 2] (a) is a model diagram that shows an example of an entire legend, and (b) is a model diagram that shows an example of the individual regions that make up the legend. [Figure 3] FIG. 10 is a model diagram schematically showing a legend in which the entire legend area is rectangular. [Figure 4] A model diagram that schematically shows a legend in which the individual bases of individual regions divide the overall base. [Figure 5] (a) is a model diagram showing the legend as a bird's-eye view, (b) is a perspective view of an individual area in which the individual slopes are straight when viewed from the side, and (c) is a perspective view of an individual area in which the individual slopes are curved when viewed from the side. [Figure 6] 10A is a perspective view showing a legend consisting of individual regions whose individual slopes are, so to speak, linear planes, and FIG. 10B is a perspective view showing a legend consisting of individual regions whose individual slopes are, so to speak, curved surfaces. [Figure 7] 1 is a block diagram showing the main configuration of a topographical plan view display system 100 according to the present invention. [Figure 8] A model diagram that shows a topographical plan view composed of multiple small areas. [Figure 9] 10 is a flowchart showing the main processing flow in which a topographical plan view display control means causes an output means to display a topographical plan view. [Figure 10] 1 is a flowchart showing the flow of main steps in the topographical plan view display method of the present invention. [Figure 11] (a) is a model diagram showing a slope legend using a slide bar, and (b) is a model diagram showing a slope legend that indicates the correspondence between road slope ranges and display colors. DETAILED DESCRIPTION OF THE INVENTION

[0022] An example of an embodiment of a topographical plan view display system and a topographical plan view display method will be described with reference to the drawings.

[0023] 1.Overview Figure 1 is a model diagram showing a topographical plan view and a legend 200 displayed on a display means (e.g., a display) by the topographical plan view display system of the present invention. As shown in this figure, one of the features of the present invention is the legend 200 displayed together with the topographical plan view, and specifically, the present invention has the technical feature of showing "slope areas" in the legend 200. This allows the degree of slope of the legend to be intuitively grasped. The legend 200 used in the present invention will be described in detail below.

[0024] FIG. 2 is a model diagram schematically illustrating an example of a legend 200 used in the present invention, where (a) shows the entire legend 200 and (b) shows individual regions 210 that make up the legend 200. As shown in this diagram, the legend 200 is made up of a plurality of individual regions. For example, in FIG. 2(a), the legend 200 is made up of seven individual regions 210, namely, individual regions 210a to 210g. The individual region 210 shown in FIG. 2(b) (in this diagram, separate region 210d) is in the form of a triangle consisting of a lower side (hereinafter referred to as the "individual base 211"), a side extending vertically (hereinafter referred to as the "individual opposite side 212"), and an upper side (hereinafter referred to as the "individual hypotenuse 213"). In addition, the entire legend 200 shown in Figure 2(a) is approximately a right-angled triangle consisting of a side located below (hereinafter referred to as the "overall base 201"), a side extending up and down (hereinafter referred to as the "overall opposite side 202"), and a side located above (hereinafter referred to as the "overall hypotenuse 203").

[0025] The multiple individual regions 210 are arranged so as to divide the region of the legend 200 (hereinafter referred to as the "entire legend region"). For example, in FIG. 2(a), seven individual regions 210 are arranged stacked from the bottom up in the order of individual region 210a to individual region 210g. Note that adjacent individual regions 210 are arranged so as not to overlap with each other. All individual regions 210 are arranged so that the vertex formed by the individual base 211 and the individual oblique side 213 (the vertex on the right in the figure) overlaps with the vertex formed by the overall base 201 and the overall oblique side 203 (the "starting point" shown in the figure), and so that the individual opposite side 212 of each individual region 210 divides the overall opposite side 202. In other words, the entire legend region is divided into multiple regions by setting multiple line segments (six in the figure) from the starting point toward the overall opposite side 202, thereby forming multiple individual regions 210 (seven in the figure).

[0026] The topographical plan view used in the present invention is expressed using a display color corresponding to the "terrain slope angle (hereinafter simply referred to as "terrain slope angle")" for each location. In contrast, the legend 200 used in the present invention divides the range of terrain slope angles (from minimum to maximum angles) included in the topographical plan view into multiple ranges (hereinafter referred to as "slope ranges"), and displays a display color for each slope range. Each slope range is represented by an individual region 210. More specifically, for example, a range from 0 to 90 degrees is divided into multiple slope ranges by setting multiple pairs of lower and upper limit angles (hereinafter referred to as "slope angle ranges"), and an individual region 210 is set for each slope range, and each individual region 210 is colored in a different display color. Note that, for convenience, the colors displayed in the individual regions 210 will be referred to as "individual display colors" herein to distinguish them from the display colors displayed on the topographical plan view. Furthermore, the display colors and individual display colors mentioned here are not limited to so-called colors such as red, blue, and green, but also include grayscales as shown in FIG. 2, and further include combinations of colors and grayscales.

[0027] Each individual region 210 is formed to include an "inclined portion" that is inclined at the upper limit of the inclination angle range. For example, the individual region 210 shown in FIG. 2 has an inclined portion formed by an individual hypotenuse 213, and the lower limit of the inclination angle range is indicated by an individual base 211. More specifically, the angle between the individual hypotenuse 213 and the horizontal line represents the upper limit of the inclination angle range, and the angle between the individual base 211 and the horizontal line represents the lower limit of the inclination angle range. This allows the user to understand the terrain inclination angle by comparing the display color of the topographical plan view with the individual display color of the legend 200 (individual region 210). Furthermore, the actual terrain inclination angle can be more intuitively grasped by the inclination of the individual base 211 and the individual hypotenuse 213.

[0028] The legend 200 used in the present invention may have a rectangular overall legend area as shown in Fig. 3. Note that the individual areas 210 (individual areas 210a to 210g) of the legend 200 shown in Fig. 3 are arranged in the manner described in Fig. 2.

[0029] In addition, in the legend 200 shown in FIG. 2, each individual region 210 is arranged so that the individual opposite side 212 divides the overall opposite side 202. However, this is not limiting; the legend 200 may also be configured so that each individual region 210 is arranged so that the individual base 211 divides the overall base 201. For example, in FIG. 4, seven individual regions 210 are arranged from right to left in the order of individual region 210a to individual region 210g. Note that adjacent individual regions 210 are arranged so that they do not overlap. All individual regions 210 are arranged so that the vertex formed by the individual opposite side 212 and the individual hypotenuse 213 (the upper left vertex in the figure) overlaps with the vertex formed by the overall opposite side 202 and the overall hypotenuse 203 (the "starting point" shown in the figure), and so that the individual base 211 of each individual region 210 divides the overall base 201. In other words, the entire legend area is divided into a plurality of areas by setting a plurality of line segments (six in the figure) from the starting point toward the overall base 201, thereby forming a plurality of individual areas 210 (seven in the figure). Note that the individual area 210 shown in Figure 4 has an inclined portion formed by an individual opposite side 212, and furthermore, an individual hypotenuse 213 indicates the lower limit angle of the inclination angle range. While the legends 200 shown in Figures 2 and 3 express the inclination angle range by changing the dimension (height) of the individual opposite side 212, the legend 200 shown in Figure 4 expresses the inclination angle range by changing the dimension (length) of the individual base 211.

[0030] Furthermore, the legend 200 may be a bird's-eye view representation of a three-dimensional individual region 210, as shown in FIG. 5. In this case, the individual region 210 is a three-dimensional object (hereinafter referred to as a "columnar body") having a columnar outer shape with a continuous identical cross section. For example, the columnar body shown in FIG. 5(b) is a hexahedron consisting of a horizontal surface (hereinafter referred to as an "individual bottom surface 214"), a vertical surface (hereinafter referred to as an "individual facing surface 215"), an inclined surface (hereinafter referred to as an "individual inclined surface 216"), and a lateral surface (hereinafter referred to as an "individual side surface 217"), and is a columnar individual region 210 with a continuous individual side surface 217. In the case of FIG. 5(b), the individual side surface 217 is triangular when viewed from the side, so the outer shape of this columnar body (individual region 210) is a triangular prism. Furthermore, the individual inclined surface 216 of the columnar body shown in Figure 5(b) is a linear plane, so to speak, in which the portion corresponding to the hypotenuse of the individual side surface 217 is a straight line. However, this is not limited to this, and the columnar body (individual region 210) can also be one in which the individual inclined surface 216 is a curved surface (the portion corresponding to the hypotenuse of the individual side surface 217 is a curved line), as shown in Figure 5(c).

[0031] When the individual regions 210 are represented as a bird's-eye view, multiple individual regions 210 (columnar bodies) are arranged side by side, and each of the multiple individual regions 210 displays a different "individual display color." Furthermore, the inclination angle (the angle formed with the horizontal plane) of the individual sloped surface 216 of each individual region 210 (columnar body) is different. In other words, in this case, the individual sloped surface 216 forms an "inclined portion," and the inclination angle indicates the upper limit angle of the inclination angle range. However, the heights of the individual facing surfaces 215 of the multiple individual regions 210 (columnar bodies) (the length of the individual facing surfaces 215 when viewed from the side) are all the same. For example, in the legend 200 shown in FIG. 5(a), individual regions 210a to 210g, all of which have the same height of the individual facing surfaces 215, are arranged side by side, and the individual facing surfaces 215 are aligned (so that the seven individual facing surfaces 215 form a single plane), and each is displayed with a different individual display color.

[0032] The legend 200 shown in FIG. 5 shows, in a bird's-eye view, individual regions 210 (columnar bodies) whose individual facing surfaces 215 have the same dimension (height), but the legend 200 may also show, in a bird's-eye view, individual regions 210 (columnar bodies) whose individual bottom surfaces 214 have the same dimension (length). For example, in FIG. 6, individual regions 210a to 210g, whose individual bottom surfaces 214 all have the same length, are arranged side by side, and each is displayed in a different individual display color. FIG. 6(a) is a perspective view showing the legend 200 made up of individual regions 210 whose individual inclined surfaces 216 are, so to speak, linear planes (the portions corresponding to the hypotenuses of the individual side surfaces 217 are straight), and FIG. 6(b) is a perspective view showing the legend 200 made up of individual regions 210 whose individual inclined surfaces 216 are curved (the portions corresponding to the hypotenuses of the individual side surfaces 217 are curved). In this case, too, the individual facing surfaces 215 are arranged so as to align (so that the seven individual facing surfaces 215 form one plane), and of course the individual bottom surfaces 214 are arranged so as to align (so that the seven individual bottom surfaces 214 form one plane). The legend 200 shown in Fig. 5 expresses the tilt angle range by changing the dimensions (length) of the individual bottom surfaces 214, whereas the legend 200 shown in Fig. 6 expresses the tilt angle range by changing the dimensions (height) of the individual facing surfaces 215.

[0033] 2. Topographical Plane Display System Next, the topographical plan view display system of the present invention will be described in detail. Note that the topographical plan view display method of the present invention is a method for displaying a topographical plan view using the topographical plan view display system of the present invention, and therefore the topographical plan view display system of the present invention will be described first, followed by the topographical plan view display method of the present invention.

[0034] 7 is a block diagram showing the main components of a topographical plan view display system 100 of the present invention. As shown in this figure, the topographical plan view display system 100 of the present invention is configured to include legend display control means 101 and topographical plan view display control means 102, and can also be configured to include individual display color determination means 103, output means 104, topographical model storage means 105, individual display color storage means 106, individual area storage means 107, display color storage means 108, etc.

[0035] The legend display control means 101, the topographical plan view display control means 102, and the individual display color determination means 103 that constitute the topographical plan view display system 100 can be manufactured as dedicated devices, or a general-purpose computer device can be used. This computer has a processor such as a CPU, storage and memory such as ROM and RAM, and may also include input means such as a mouse and keyboard, and a display. Examples of such computers include portable terminal devices such as tablet computers (such as an iPad (registered trademark)) and smartphones, as well as personal computers (PCs) and servers. When using a computer with a display, it is recommended to use this display as the output means 104.

[0036] Furthermore, the topographical model storage means 105, the individual display color storage means 106, the individual area storage means 107, and the display color storage means 108 can be implemented using a storage device of a computer device, or can be implemented in a database server. When implemented in a database server, they can be placed on a local network (LAN: Local Area Network), or can be a cloud server that stores data via the Internet (for example, wireless communication).

[0037] Below, each of the main elements that make up the topographical plan view display system 100 will be described in detail.

[0038] (Legend display control means) The legend display control means 101 is a means for displaying the legend 200 described above on the output means 104. More specifically, it reads out information about the individual regions 210 stored in the individual region storage means 107 (hereinafter referred to as "individual region information") (FIG. 7), and also reads out information about the "individual display colors" stored in the individual display color storage means 106 (FIG. 7), and draws the legend 200 on the output means 104 based on this information. Here, the individual region information is information about the number of individual regions 210 that make up the legend 200, the shape (particularly the sloped portions), arrangement, etc. of each individual region 210. That is, the legend display control means 101 arranges the multiple individual regions 210 in accordance with the individual region information, and displays the individual display colors corresponding to each individual region 210 in each individual region 210, thereby displaying the legend 200.

[0039] The legend display control means 101 can also display or hide the legend 200 on the output means 104. At this time, multiple individual regions 210 arranged within the legend 200 can be selectively displayed or hidden. More specifically, the operator operates a pointing device (such as a mouse) or a keyboard to designate a desired individual region 210 and select on / off, thereby turning the designated individual region 210 on or off. Of course, the entire legend 200 can also be displayed or hidden by designating all individual regions 210. Because the legend 200 is displayed together with the topographical plan, the legend 200 may sometimes interfere with the understanding of the topography. Therefore, hiding part (or all) of the legend 200 can facilitate the understanding of the topography. Furthermore, in cases where a particular topographical slope angle is of particular interest, the topographical plan can be viewed by displaying only the relevant individual region 210, which is advantageous because it makes it easier to extract the location of the topographical slope angle of interest.

[0040] (Topographical plan display control means) The topographical plan view display control means 102 is a means for displaying a topographical plan view on the output means 104. This topographical plan view displays the terrain slope angle in stages, i.e., for each slope range, using display colors. Various image formats, such as raster images and vector images, can be used as the topographical plan view. The topographical plan view can also be a two-dimensional (planar) display of a model such as the DEM or DSM terrain described above. In this case, the topographical plan view is formed by a number of grids and meshes (hereinafter referred to as "small regions MS") separated by the grids, as shown in FIG. 8. Each small region MS is assigned three-dimensional coordinates, and each small region MS can also be assigned a terrain slope angle. This terrain slope angle is a physical quantity also known as the "slope amount," and can be calculated using the three-dimensional coordinates of the small region MS of interest and the three-dimensional coordinates of the surrounding small regions MS (e.g., eight surrounding small regions MS). The topographical plan view is stored in the topographical model storage means 105, and the topographical slope angle and three-dimensional coordinates of the small area MS are also stored in the topographical model storage means 105.

[0041] Below, we will explain the main processing flow in which the topographical plan view display control means 102 displays the topographical plan view on the output means 104 when using a topographical plan view in which a topographical slope angle has been assigned to a small area MS, with reference to Fig. 9. In the flow chart of Fig. 9, the action to be performed is shown in the center column, the things necessary for that action are shown in the left column, and the things resulting from that action are shown in the right column.

[0042] First, the individual display color determination means 103 (FIG. 7) obtains the terrain slope angle for a small area MS of interest by referencing the terrain model storage means 105, and determines the slope range corresponding to the small area MS (Step 301 in FIG. 9). Here, the slope range is a slope angle range set within the range of 0 to 90 degrees, as described above, and one slope range (i.e., slope angle range) is associated with one individual area 210. In other words, the individual display color determination means 103 determines the slope range corresponding to the obtained terrain slope angle (i.e., the terrain slope angle is between the upper and lower limit angles of the slope angle range) as the slope range corresponding to the small area MS.

[0043] Once the slope range is determined, the individual display color determination means 103 queries the display color storage means 108 (FIG. 7) for that slope range, thereby acquiring information on the same display color as the individual display color associated with that slope range (i.e., slope angle range) (Step 302 in FIG. 9). Note that the individual display color storage means 106 may also serve as the display color storage means 108, and the individual display color determination means 103 may acquire information on the individual display color corresponding to the terrain slope angle from the individual display color storage means 106. Then, when a series of processes consisting of determining the slope range (Step 301 in FIG. 9) to acquiring the display color (Step 302 in FIG. 9) are repeatedly executed for all small areas MS, the topographical plan view display control means 102, which receives this, displays (colors) the corresponding small areas MS in an appropriate display color, thereby displaying the topographical plan view on the output means 104 (Step 303 in FIG. 9).

[0044] 3. How to display topographical maps Next, the topographical plan view display method of the present invention will be described with reference to Figure 10. Note that the topographical plan view display method of the present invention is a method for displaying a topographical plan view using the topographical plan view display system 100 described up to this point, and therefore, we will avoid any overlapping explanation with the contents explained in the topographical plan view display system 100, and will only explain the contents unique to the topographical plan view display method of the present invention. In other words, the contents not described here are the same as those explained in "2. Topographical plan view display system."

[0045] 10 is a flow diagram showing the flow of the main steps of the topographical plan view display method of the present invention. First, the topographical plan view display system 100 is started, and the topographical plan view is displayed on the output means 104 (Step 10 in FIG. 10), and the legend 200 is also displayed on the output means 104 (Step 20 in FIG. 10). Then, the operator can hide or redisplay a desired individual area 210, or selectively display or hide the individual area 210 (Step 30 in FIG. 10). [Industrial Applicability]

[0046] The topographical plan view display system and topographical plan view display method of the present invention can be used for topographical plan views of various regions, including mountainous areas, plains, urban areas, etc. When used for topographical plan views of urban areas in particular, it can provide intuitive slope and step information that is useful for elderly people and wheelchair users, and can also be effectively used in disaster prevention planning. Thus, the present invention is not only applicable to industry, but is also expected to make a significant contribution to society. [Explanation of symbols]

[0047] 100 Topographical plan view display system of the present invention 101 (Topographical Plan Display System) Legend Display Control Means 102 (of the topographical plan display system) topographical plan display control means 103 (Topographical Plan Display System) Individual Display Color Determination Means 104 (Topographical Plan Display System) Output Means 105 Terrain model storage means (for topographical plan display systems) 106 (Topographical Plan Display System) Individual Display Color Memory Means 107 Individual area storage means (of topographical plan display system) 108 (Topographical Plan Display System) Display Color Memory Means 200 (Topographic Plan Display System) Legend 201 (legend) overall base 202 (Legend) Whole Side 203 (Legend) Overall hypotenuse 210 Individual Areas (of Legend) 211 Individual base (of an individual area) 212 (individual area) individual opposite sides 213 Individual hypotenuse (of an individual area) 214 Individual bottom (of individual area) 215 (individual area) individual face-to-face 216 Individual slopes (individual areas) 217 Individual aspects (of individual areas) MS small area

Claims

1. A system for displaying a topographical plan view in which a display color is applied according to the degree of inclination of the terrain, a legend display control means for displaying a legend consisting of a plurality of individual regions; a topographical plan view display control means for displaying the topographical plan view, The individual regions are regions corresponding to respective inclination angle ranges, and are formed to include inclined portions inclined at upper limit angles of the inclination angle ranges, the legend display control means displays the individual regions as bird's-eye views of the columns, and displays them in different individual display colors; Each of the pillars has a continuous pillar shape in a side view, and includes a horizontal individual bottom surface, a vertical individual opposite surface, and an individual inclined surface that constitutes the inclined portion; the individual inclined surfaces of the columnar bodies are straight or curved in accordance with the upper limit angle in a side view, The individual opposing surfaces of the columnar body all have the same dimensions when viewed from the side. A topographical plan view display system.

2. A system for displaying a topographical plan view in which a display color is applied according to the degree of inclination of the terrain, a legend display control means for displaying a legend consisting of a plurality of individual regions; a topographical plan view display control means for displaying the topographical plan view, The individual regions are regions corresponding to respective inclination angle ranges, and are formed to include inclined portions inclined at upper limit angles of the inclination angle ranges, the legend display control means displays the individual regions as bird's-eye views of the columns, and displays them in different individual display colors; Each of the pillars has a continuous pillar shape in a side view, and includes a horizontal individual bottom surface, a vertical individual opposite surface, and an individual inclined surface that constitutes the inclined portion; the individual inclined surfaces of the columnar bodies are straight or curved in accordance with the upper limit angle in a side view, The individual bottom surfaces of the pillars all have the same dimensions when viewed from the side. A topographical plan view display system.

3. A system for displaying a topographical plan view in which a display color is applied according to the degree of inclination of the terrain, a legend display control means for displaying an entire legend area consisting of a plurality of individual areas as a legend; a topographical plan view display control means for displaying the topographical plan view, the legend display control means displays the individual regions in different individual display colors, the legend overall region is a triangular region consisting of an overall base, an overall opposite side extending up and down, and an overall hypotenuse, and the vertex formed by the overall base and the overall hypotenuse is set as the starting point; The individual regions are regions corresponding to respective inclination angle ranges, and are triangular regions each including an individual base, an individual opposite side, and an inclined portion inclined at an upper limit angle of the inclination angle range, the legend display control means displays the legend so that a plurality of individual regions are formed by setting a plurality of line segments from the starting point toward the opposite side of the entirety; The inclination angle range for each individual region can be expressed by changing the height of the individual opposite side for each individual region. A topographical plan view display system.

4. A system for displaying a topographical plan view in which a display color is applied according to the degree of inclination of the terrain, a legend display control means for displaying an entire legend area consisting of a plurality of individual areas as a legend; a topographical plan view display control means for displaying the topographical plan view, the legend display control means displays the individual regions in different individual display colors, the legend overall region is a triangular region consisting of an overall base, an overall opposite side extending up and down, and an overall hypotenuse, and the vertex formed by the overall opposite side and the overall hypotenuse is set as the origin; The individual regions are regions corresponding to respective inclination angle ranges, and are triangular regions each including an individual base, an individual opposite side, and an inclined portion inclined at an upper limit angle of the inclination angle range, the legend display control means displays the legend so that a plurality of individual regions are formed by setting a plurality of line segments from the starting point toward the overall bottom side; The inclination angle range for each individual region can be expressed by changing the length of the individual base side for each individual region. A topographical plan view display system.

5. a terrain inclination angle is assigned to each of a plurality of small regions constituting the terrain plan view; the topographical plan view display control means displays the small area in the same display color as the individual display color of the individual area related to the inclination angle range that includes the topographical inclination angle of the small area.

5. A topographical plan view display system according to claim 1.

6. the legend display control means has a function of individually selecting and displaying or hiding each of the individual areas; 6. A topographical plan view display system according to claim 1.

7. A method for displaying a topographical plan view, on which display colors are assigned according to the degree of inclination of the terrain, together with a legend, comprising: the legend is composed of a plurality of individual regions; The individual regions are regions corresponding to respective inclination angle ranges, and are formed to include inclined portions inclined at upper limit angles of the inclination angle ranges, the topographical plan view is composed of a plurality of small areas, and a topographical inclination angle is assigned to each of the small areas; The individual regions are displayed as bird's-eye views of the columnar bodies, and are displayed in different individual display colors, Each of the pillars has a continuous pillar shape in a side view, and includes a horizontal individual bottom surface, a vertical individual opposite surface, and an individual inclined surface that constitutes the inclined portion; the individual inclined surfaces of the columnar bodies are straight or curved in accordance with the upper limit angle in a side view, The individual opposing surfaces of the columnar body all have the same dimensions when viewed from the side, selecting the individual area by comparing the terrain slope angle of the small area with the slope angle range, and displaying the small area in the individual display color of the selected individual area; A method for displaying a topographical plan view.

8. A method for displaying a topographical plan view, on which display colors are assigned according to the degree of inclination of the terrain, together with a legend, comprising: the legend is composed of a plurality of individual regions; The individual regions are regions corresponding to respective inclination angle ranges, and are formed to include inclined portions inclined at upper limit angles of the inclination angle ranges, the topographical plan view is composed of a plurality of small areas, and a topographical inclination angle is assigned to each of the small areas; The individual regions are displayed as bird's-eye views of the columnar bodies, and are displayed in different individual display colors, Each of the pillars has a continuous pillar shape in a side view, and includes a horizontal individual bottom surface, a vertical individual opposite surface, and an individual inclined surface that constitutes the inclined portion; the individual inclined surfaces of the columnar bodies are straight or curved in accordance with the upper limit angle in a side view, The individual bottom surfaces of the pillars all have the same dimensions when viewed from the side, selecting the individual area by comparing the terrain slope angle of the small area with the slope angle range, and displaying the small area in the individual display color of the selected individual area; A method for displaying a topographical plan view.

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