JP6518468B2 - Information processing device, map display system - Google Patents

Description

  The present invention relates to an information processing apparatus, a map display system, and a program.

  There is known a technology for converting geographic data in real space into electronic map data and displaying the electronic map on a display or the like. Such a technology can be used to display an electronic map of a user's current position or an arbitrary place, and thus is widely applied to navigation systems, GIS (Geographic Information System), and the like.

  Since map data for displaying an electronic map is prepared in advance for each map display system, it is characterized in that it is static compared to the landscape in real space. That is, if it is real space, scenery may change greatly with time zones, seasons, weather, etc., but the map display system can display only the electronic map created based on the map data prepared beforehand.

  Then, the technique which changes the display mode of an electronic map by time slot | zone, a season, a weather, etc. is devised conventionally (for example, refer patent document 1, 2). Patent Document 1 discloses a navigation device that displays sky in clear sky in the case of fine weather according to weather information, and in gray in the case of rainy weather or cloudy weather. Patent Document 2 discloses a navigation device that changes the display color of the background of map information depending on the season, the weather, or the time zone.

JP 2005-258455 A Japanese Patent Application Laid-Open No. 10-221093

  However, Patent Documents 1 and 2 are both techniques for changing the color of the background such as the sky, and there is a problem that the color of the feature displayed on the electronic map can not be changed. For example, it is known that features such as high elevation mountains present in real space change color depending on the season, but the color of such features can not be changed by the prior art.

  Note that, as described in Patent Document 2, the map book of a print medium such as paper may be painted differently depending on the elevation value, but it may be displayed on an electronic map. It was not being done.

  An object of this invention is to provide the information processing apparatus which can change the color of the terrestrial feature displayed on an electronic map according to the altitude in view of the said subject.

In view of the above problems, the present invention is an information processing apparatus that creates an electronic map using map data having three-dimensional information, and is for drawing a feature affected by the altitude and the season of the area to be drawn . color information of the polygon data, the map information storage means in association with the altitude and the season for each of the areas was divided by latitude and longitude is registered, the local drawing target, depending on the altitude and the season reading means for reading the color information, and snow information obtaining means for obtaining snow information of the real-time affecting the color information of the features included in the region, influence on the color information of the features included in the region If you can get a snow information real-time to provide a change of the color information of the polygon data for the feature rendering based on the snow information the snow information acquisition unit acquires Draw the feature of the region in which it has been expressed in three dimensions Te, when it is not possible to acquire the real-time snow information, land of the region in which it has been expressed in three dimensions by using the color information in which the reading means has read It has a feature drawing means for drawing an object, and an electronic map creating means for creating an electronic map including the feature drawn by the feature drawing means.

  It is possible to provide an information processing apparatus capable of changing the color of the feature displayed on the electronic map in accordance with the altitude.

It is an example of the figure explaining the outline of the display of the electronic map by the map display system of this embodiment. It is an example of the system configuration figure of the map display system in a present Example. It is an example of the hardware block diagram of a server and a terminal. It is an example of the functional block diagram which illustrated each function with which a map display system is provided. It is an example of the figure which illustrates the relation between a mesh and a feature typically. It is a figure which shows an example of the color information (apex color) of polygon data contained in map DB. It is an example of the flowchart figure which shows the drawing procedure of a three-dimensional map. It is an example of the flowchart figure which shows the procedure of the process of FIG.7 S20. It is a figure which shows the example of a drawing of the terrestrial feature according to the season of the mesh of drawing object. It is an example of the functional block diagram which illustrated each function with which a map display system is provided (Example 2). It is an example of the flowchart figure which shows the procedure of the process of FIG.7 S20 (Example 2). It is an example of the figure explaining the color information according to the presence or absence of the autumn leaves front and autumn leaves of September-December. It is a figure which shows the example of a drawing of the mountain when it is not the flowering time of a cherry blossom, and the drawing example of the mountain of the flowering time of a cherry blossoms. It is an example of the figure which illustrates application of a gradation typically.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Outline of this embodiment>
FIG. 1 is an example of a diagram for explaining an outline of display of an electronic map by the map display system of the present embodiment. In FIG. 1, two peaks 11 and 12 expressed in three dimensions are drawn. The height (altitude) of the mountain 12 is higher than that of the mountain 11. In the map display system of this embodiment, the map data has elevation data, and elevation data of a place where the mountains 11 and 12 exist can be used. Moreover, map data has the information with which the relationship between the altitude and snow cover was matched.

  Therefore, the map drawing system reads the elevation data of the locations of the mountains 11 and 12 from the map data, and determines whether the altitude is a snowfall state or not according to the presence or absence of snowfall in the colors of the mountains 11 and 12 Can be Thereby, as shown in FIG. 1, although the upper part of the mountain 11 is drawn with an initial value such as green, the upper part of the mountain 12 which is covered with snow can be drawn in white.

  As will be described later, the presence or absence of snowfall is greatly influenced by the season, and also by the latitude as well as the altitude. Also, as snowfall differs between the Japan Sea side and the Pacific side at the same latitude, the presence of snow also depends on the location. For this reason, the map data used for drawing the feature of the present embodiment has color information associated with the season, the altitude, and the place (latitude / longitude).

  The map display system reads out color information (white, meaning snowfall in this embodiment) associated with the season at the time of drawing, the altitude of the place to be drawn, and the latitude and longitude of the place to be drawn. Determine the color of the feature (eg mountain) in the place. Therefore, according to the present embodiment, it is possible to change the color of the three-dimensional high-relevant feature according to the season.

  The feature means all natural or artificial objects present on the ground.

<Example of system configuration>
FIG. 2 is an example of a system configuration diagram of the map display system 100 in the present embodiment. The map display system 100 includes a server 21 and a terminal 22 that can communicate via the network 13. The network 13 is, for example, a LAN, a WAN to which a plurality of wide area LANs are connected, and the Internet. The network 13 may be configured by only wired or wireless, or may be configured by wired and wireless. In addition, a base station 14 such as an access point is connected to the network 13, and the terminal 22 wirelessly connects to the network 13 by accessing the base station 14. The terminal 22 accesses the base station 14 via a communication network mainly constructed by radio such as a mobile phone network or a wireless LAN.

  The server 21 is an information processing apparatus that provides the terminal 22 with a display related to an electronic map, a service related to navigation, and the like. For example, position information of the current position or the position of the drawing target is acquired from the terminal 22, an electronic map around the current position or the position of the drawing target is created, and transmitted to the terminal 22. Also, for example, the current location and the destination are acquired from the terminal 22 and a route is searched, and route information and a navigation screen (a screen in which a route is set in an electronic map) are transmitted to the terminal 22.

  The terminal 22 is a map display terminal or a navigation terminal used by the user. The terminal 22 may be a general-purpose information processing terminal 221 or 223 or a navigation dedicated terminal 222. The navigation dedicated terminal 222 is also called a PND (Portable Navigation Device). The terminal 22 in the present embodiment may be other than the information processing terminals 221 and 223 or the navigation dedicated terminal 222.

  The information processing terminal 221 is a portable device, and is mainly connected to the network 13 wirelessly. The information processing terminal 223 is a stationary device, and is mainly connected to the network 13 by wire. However, since the information processing terminal 221 and the information processing terminal 223 are largely different in size and weight of the apparatus and there are few functional differences, it is not necessary to distinguish between the two.

  The terminal 22 as the information processing terminal 221 is, for example, a smartphone, a tablet terminal, a mobile phone, a PDA (Personal Digital Assistant), a notebook PC, a wearable PC, or the like. The terminal 22 as the information processing terminal 223 is, for example, a desktop PC, a laptop PC, and a notebook PC. The information processing terminal 221 and the information processing terminal 223 are not limited to these, as long as they are devices suitable for route guidance.

  Although the information processing terminal 221 and the information processing terminal 223 are usually used as an information processing terminal, when application software for displaying and navigating an electronic map is executed, the display and route of the electronic map are performed as in the navigation dedicated terminal 222. Perform search and route guidance.

  In addition, the terminal 22 may be capable of switching between the on-vehicle state and the portable state in either of the general-purpose information processing terminals 221 and 223 and the navigation dedicated terminal 222. Alternatively, it may be fixed in the on-vehicle state.

  In addition, there are roughly two operation modes of the terminal 22. One is a client-type operation mode in which the terminal 22 activates, for example, dedicated application software or a web browser to communicate with the server 21 and receives and displays information on route guidance. The other is an application-type operating terminal that completes processing such as map drawing in principle within the terminal and communicates with the server 21 only when it is necessary to acquire map data. Although the client type is described as an example in the present embodiment, the route guidance of the present embodiment can be suitably applied to application types as well.

  The user may use the map display system 100 using two terminals 22. For example, the drive portal site is accessed by a terminal 22 such as a notebook PC, and a route from a departure place to a destination is searched in advance. The drive portal site is an information service site for a driver. The searched route is registered in the drive portal site, and the route information registered from the terminal 22 such as a smartphone is downloaded at an arbitrary timing. By such usage, the user can search the route in advance, and the number of operations of the terminal 22 before departure can be reduced.

  FIG. 3 is an example of a hardware configuration diagram of the server 21 and the terminal 22. The server 21 and the terminal 22 have the function of an information processing apparatus. As shown in FIG. 3A, the server 21 has a hardware configuration such as a central processing unit (CPU) 211, an input device 212, a display device 213, a communication device 214, a read only memory (ROM) 215, and a random access memory (RAM). (Access Memory) 216 and an auxiliary storage device 217.

  Further, as shown in FIG. 3B, the terminal 22 has a hardware configuration including a CPU 211, an input device 212, a display device 213, a communication device 214, a ROM 215, a RAM 216, an auxiliary storage device 217, an audio input / output device 218, And a GPS receiver 219.

  The CPU 211 executes various programs and performs arithmetic processing. The ROM 215 stores programs and the like required at startup. The RAM 216 is a work area that temporarily stores the processing of the CPU 211 and stores data. The auxiliary storage device 217 is a non-volatile memory that stores various data and programs 2101 and 2102. The input device 212 is, for example, a keyboard or a mouse. The display device 213 is a display, a projector, or a HUD (Head Up Display), and for example, a navigation screen or the like is displayed. The communication device 214 is connected to the network 13 via the base station 14 and communicates with the server 21 and the like. The voice input / output device 218 is a device that performs voice input / output, and for example, navigation voice guidance is output. The GPS receiver 219 is an example of a GNSS (Global Navigation Satellite System) that receives radio waves of GPS satellites and calculates the current position.

  The input device 212 of the terminal 22 may be realized by a touch panel capable of detecting a touch position (touch coordinates) on the screen instead of or in addition to a keyboard and a mouse. In addition, the input device 212 may have a function as a voice recognition device that recognizes voice input by the voice input / output device 218.

  The programs 2101 and 2102 stored in the auxiliary storage device 217 of the server 21 or the terminal 22 are distributed in the state of being stored in a storage medium (not shown). Alternatively, it is distributed by the terminal 22 downloading from the server 21 distributing the program. The program 2102 of the terminal 22 may be application software dedicated to route guidance or browser software. Also, it may be distributed in an executable format or in an installation format.

<Example of functional configuration of map display system>
FIG. 4: is an example of the functional block diagram which illustrated each function with which the map display system 100 of a present Example is equipped. The server 21 includes a server transmission / reception unit 31, a navigation screen creation unit 32, a route search unit 33, a three-dimensional map drawing unit 34, and a storage / read processing unit 39. The CPU 211 shown in FIG. 3 executes the program 2101 so that each of these functions (server transmission / reception unit 31, navigation screen creation unit 32, route search unit 33, three-dimensional map drawing unit 34 and storage / readout processing unit 39) It is a function or means realized by cooperating with 21 hardwares. Some or all of these functions may be realized by a hardware circuit such as an IC.

  Further, the server 21 has a storage unit 1000 realized by the auxiliary storage device 217, the ROM 215 or the RAM 216 shown in FIG. In the storage unit 1000, a map DB 1001, a road network DB 1002, and a pedestrian network DB 1003 are constructed. Each of these DBs may not be directly possessed by the server 21, but may be at any place on the network 13 accessible by the server 21.

  The map DB 1001 stores map data for drawing an electronic map. Information displayed on the electronic map has many display targets such as divisions such as prefectures, green areas and rivers, roads and railways, symbols and notes, etc., so it can be classified as similar in nature and drawn for each classification It is supposed to be. The display object or the state in which the display object classified into each is drawn is referred to as a layer, and the electronic map is drawn by overlapping several layers. The map data of each layer is described in a format suitable for a display target among vector data or raster data. Further, the map data is divided in a mesh shape whose longitude, latitude, etc. are known, and one or more meshes are combined to create a navigation screen. In the case of vector beta, the positions of points, polylines, and polygons are determined by latitude and longitude. In the case of raster data, data corresponding to the scale is prepared in association with the latitude and longitude.

  The map data also includes polygon data (three-dimensional data) of features such as mountains, and among map data, for example, FIG. 6 shows the data structure of feature colors whose color may change according to the season. Explain.

  The road network DB 1002 is data representing the structure of roads through which vehicles can pass, and has a node table and a link table. In the node table, nodes on the road network expression are registered in association with latitude and longitude. A nodal point is called a node. The nodes are, for example, intersections, junctions, junctions, and inflection points. In the link table, roads where vehicles can pass are registered in association with the node numbers of the nodes. Roads where vehicles can pass are general roads, expressways, private roads, and private roads. Also, in the link table, link types, widths, link lengths and the like are registered. A road between two nodes is called a link, and the link is a line connecting the nodes.

  The pedestrian network DB 1003 is similar to the road network DB 1002 in that it has a node table and a link table. However, in the pedestrian network DB 1003, a link of a road through which a pedestrian can pass (a sidewalk, a pedestrian crossing, a footbridge, an underground road, a walkable passage, etc.) and nodes of start and end points of the link are registered.

  Besides, in the navigation which proposes the optimum combination of various transportation means, a route map of a train, a map of bus operation, a map of flight operation of an airplane, and these timetables are used, but they are omitted in the figure.

  Subsequently, functions or means of the server 21 will be described. The server transmission / reception unit 31 receives various requests for navigation from the terminal 22. This request includes, for example, a request for displaying an electronic map, a request for searching for a destination, and a request for updating a navigation screen (enlargement / reduction, change of display range, etc.). These requests are distributed to the navigation screen creation unit 32 and the route search unit 33.

  When the server 21 receives the display request of the electronic map, the navigation screen creation unit 32 creates an electronic map of a predetermined scale including position information included in the display request or a predetermined position. The position information included in the display request is position information of the current position of the user or the position designated by the user. The predetermined position is, for example, a fixed position such as Tokyo Station or Osaka Station.

  When the server 21 receives a search request, the route search unit 33 searches for a route using at least one of the road network DB 1002 and the pedestrian network DB 1003 in response to the search request, and creates route information. The route information includes links and nodes indicating the route from the departure point to the destination, and the route is specified by guidance information of the route called guidance point (node for route change, passing node, position for guiding route change) You will be guided.

  For the route search, the Dijkstra method is known in which the link length, width, and traffic congestion condition are converted into costs, and a route with the smallest total cost from the departure point to the destination point is selected. A search method other than the Dijkstra method may be used. Further, in the route search, user settings such as whether to use a toll road and prioritizing a general road are considered.

  The route search unit 33 sends the route information from the departure place obtained by the search to the destination to the navigation screen creation unit 32 and the server transmission / reception unit 31. The navigation screen creation unit 32 creates an electronic map including an area from the departure place to the destination, and creates a navigation screen in which the route, the departure place and the destination are highlighted in the electronic map. Furthermore, the current position of the user may be displayed. Also, when the user starts moving, the navigation screen creation unit 32 creates a navigation screen of a scale suitable for guidance. Further, when the update request is acquired from the terminal 22, the navigation screen creation unit 32 creates a navigation screen according to the requested scale and display range. The server transmission / reception unit 31 transmits the route information and the navigation screen thus created to the terminal 22.

When the three-dimensional map drawing unit 34 is requested to draw a three-dimensional map from the navigation screen creation unit 32, an electronic map (three-dimensional map) to which three-dimensional information such as the elevation of land and the height of a building is added Create). That is, an electronic map is created by arranging polygon data such as the elevation of a land or a building in a three-dimensional space and projecting it on a plane. Details will be described with reference to FIG. Note that whether or not to draw a three-dimensional map is determined in advance by the drawing area or determined by the instruction of the user.
The storage / read processing unit 39 reads data from various databases of the storage unit 1000 in response to requests from the server transmission / reception unit 31, the navigation screen creation unit 32, the route search unit 33, and the three-dimensional map drawing unit 34. Write data to various databases.

  Subsequently, the function or means of the terminal 22 will be described. The terminal 22 includes a terminal transmission / reception unit 41, an operation reception unit 42, a position detection unit 43, a route guidance unit 44, and a navigation screen display unit 45. These are functions or means implemented by the CPU 211 shown in FIG. 4 executing the program 2102 and cooperating with the hardware of the terminal 22. Some or all of these functions may be realized by a hardware circuit such as an IC.

  The terminal transmission / reception unit 41 transmits, to the server 21, a request for displaying an electronic map, a request for searching a route, and a request for updating a navigation screen, and receives an electronic map, navigation screen or route information from the server 21. Also, the terminal transmission / reception unit 41 transmits the current position to the server 21 as necessary.

  The operation receiving unit 42 receives, from the user, an operation for displaying an electronic map, an input of a departure point and a destination for a route search, an instruction of enlargement / scale, and an instruction of changing a display range.

  The position detection unit 43 detects the current position periodically and in accordance with the user's operation. The detected current position is transmitted from the terminal transmission / reception unit 41 to the server 21.

  The route guidance unit 44 performs route guidance based on the route information acquired from the server 21 and the current position. That is, when the current position of the user reaches the position to be changed which is included in the route information, the voice input / output device 218 is made to output voice data indicating a corner or the like. The voice data may be transmitted from the server 21 or may be created by performing voice synthesis on the basis of text data for guidance by the terminal 22.

  The navigation screen display unit 45 displays the electronic map and the navigation screen received from the server 21 on the display device 213. Further, the current position detected by the position detection unit 43 is corrected on the route (by route matching), and is synthesized on the electronic map or the navigation screen as the current position of the user. When the route information is not searched, map matching is performed to correct the current position on a link such as a road or a road where the user should be present. The route matching or the map matching may be performed by the server 21.

<Control of the color of features with high elevation>
Subsequently, control of the color of a feature having a high elevation will be described using FIGS. FIG. 5 is an example of a diagram schematically illustrating the relationship between the mesh and the feature. FIG. 5 (a) shows a side view of a mountain, and FIG. 5 (b) shows a top view of the mountain. One mountain is divided into several meshes 70 (an example of a region) according to the size of the mountain. A mesh is one section in the case where the whole of Japan is divided into grids by longitude and latitude. For example, the Geographical Survey Institute publishes a digital elevation model as one of the basic map information, and publishes elevation data of meshes of 5, 10 and 250 m per side. Therefore, the elevation of each mesh 70 is clarified from the map data.
Since elevation is one of the factors affecting snowfall, if the snowfall state associated with the mesh and the elevation is known, the three-dimensional map drawing unit 34 changes the color of the polygon data of the mesh feature to a color that means snowfall state. can do. In FIG. 5B, the mesh 70 which is not hatched is in the snow accumulation state.

  FIG. 6 is a view showing an example of color information (apex color) 80 of polygon data included in the map DB 1001. First, map data has elevation data for each mesh. In FIG. 6, elevations and color information 80 of some of the meshes 81 to 84 are shown for the purpose of explanation. Mesh 81 is a mesh with a Kanto plain, mesh 82 is a mesh with a mountain along the Sea of Japan, mesh 83 is a mesh with a Pacific side of the Tohoku region, and mesh 84 is a mesh with an inland area of Hokkaido It is. The height of the mesh 81 is 300 m, the height of the mesh 82 is 2500 m, the height of the mesh 83 is 800 m, and the height of the mesh 84 is 1500 m.

  In the map DB 1001, color information 80 is registered in association with the season for each mesh. As the color information 80, white or an initial value is registered. White means the color of snow and ice. Further, the initial value means that drawing is performed with the original color of polygon data. For example, in the case of a mountain, the initial value of the mountain is green or a similar color, and in the case of a road such as an urban area, it is a road color (such as gray).

  Such color information 80 is created based on the snow condition of each area collected at least throughout the year. The explanation will be made with Fuji as an example. For example, it is collected when snowfall of Mt. Fuji starts and ends. When snow starts, the observer records the mesh in which the snow has been confirmed, and the season in which the snow starts (including Mt. Fuji) is obtained for the mesh whose elevation is known. After that, when the season progresses and the temperature drops, the area of snow coverage spreads over the mesh with low elevation. As the snow cover area expands, the observer records the mesh and season for which the elevation is known. Thereby, mesh color information 80 can be created from autumn to winter.

  Since the temperature rises and the snow melts as the season approaches spring, the snow mesh is limited to the higher elevation mesh. The observer records the mesh where the snowfall has disappeared in association with the season. Thereby, mesh color information 80 can be created from spring to summer.

  In practice, the observer obtains information of snow coverage at a certain moment such as the moon and the season for each mesh, and registers the snow condition (color of each mesh) correlated with the season and the mesh. Observers repeat similar observations at intervals of a year. The color information 80 is preferably created by statistically processing snow conditions of not only one year but also past years.

  According to the example of FIG. 6, for example, the mesh 81 of the Kanto plain has a low altitude, and therefore, there is no snowfall throughout the year, and the color information 80 is an initial value regardless of the season. Since the mesh 82 along the mountain on the Japan Sea side is high in elevation because there are many snowfalls in winter even in spring, snow remains in the city area, so the color information 80 for winter and spring is white. The mesh 83 on the Pacific side in the Tohoku region has high latitude but little snowfall, so the color information 80 is white only in winter. Since the mesh 84 in the inland area of Hokkaido has high latitude and altitude, snow is covered from autumn to spring, and except for summer, the color information 80 from autumn to spring becomes white.

  Thus, the degree of snowfall can be greatly affected by the latitude and longitude (place) and the altitude. In this embodiment, by using this color information 80, it is possible to change the color of a feature having a high elevation such as a mountain according to the season.

  In FIG. 6, the color information 80 is registered according to the four seasons of spring, summer, autumn and winter, but the color information 80 may be registered according to, for example, the month (January to December). The color information 80 may be registered in three divisions in early, middle and late. The color information 80 may be registered on the number of days from the beginning of the year (1 to 365 days). Also, the color information 80 may be associated with each time zone such as dawn, daytime, evening, nighttime and the like. Furthermore, color information 80 may be associated with each weather.

  If the color information 80 is managed both in the season and, for example, every month (each in January to December), the setting of the shorter period (in this example, every month) is prioritized with respect to the periodical division. Good. This is because it is easier to match the color of the three-dimensional map and the color of the real space when the period is short.

  Further, although the width of one mesh is not particularly limited, the color information 80 may be managed in a relatively wide range such as primary mesh and secondary mesh. Snow is relatively, widely used to snow. When the color information 80 is managed in both the primary mesh and the secondary mesh, setting of a narrower range may be prioritized. This is because it is easier to match the color of the three-dimensional map and the color of the real space when the range is narrow.

<< 3D map drawing procedure >>
Then, the drawing procedure of a three-dimensional map is demonstrated using FIG. FIG. 7 is an example of a flowchart showing a drawing procedure of a three-dimensional map. The procedure of FIG. 7 starts when the three-dimensional map drawing unit 34 is requested by the navigation screen creation unit 32 to draw a three-dimensional map. The three-dimensional map drawing unit 34 reads polygon data of a feature to be drawn. The polygon data includes vertex coordinates of polygons such as triangles and quadrangles, normals, vertex colors (initial values in FIG. 6), and UV coordinates of textures (if there is a texture).

  First, the three-dimensional map drawing unit 34 converts model coordinates of the feature into world coordinates (S10). Model coordinates are coordinates based on a coordinate system (local coordinate system) used when modeling a feature, and world coordinates are coordinates based on a coordinate system of a three-dimensional space to be drawn. When the vertex coordinates and the like of the polygon are converted into world coordinates in advance, the process of step S10 is unnecessary.

  Next, the three-dimensional map drawing unit 34 refers to the color information 80 as shown in FIG. 6 and adjusts the vertex color of the feature to be drawn according to the current season (S20). Details will be described with reference to FIG.

  Next, the three-dimensional map drawing unit 34 performs view conversion (S30). View conversion is to set where a feature drawn in three dimensions is viewed, and to convert it to coordinates when viewed from a set direction. This set direction is determined by the camera position, the gaze point of the camera, and the upward direction of the camera, but is automatically set if the current position and the traveling direction of the user are known. In addition, the user may optionally set where to view the feature. The view conversion provides the features seen from the camera. The camera position becomes the origin of world coordinates by view conversion.

  Next, the three-dimensional map drawing unit 34 performs projective transformation (S40). Projective transformation is a process of projecting features on three-dimensional coordinates onto a two-dimensional plane. Specifically, the field angle to be displayed, the aspect ratio of the electronic map, and the distance in the depth direction to be drawn are set, and the feature is projected on the plane.

Next, the three-dimensional map drawing unit 34 performs a lighting process (S50). Lighting is the process of determining the final rendered color taking into account the effects of light. The strength of the light influence in the polygon is calculated according to the angle between the normal vector of the polygon and the direction of the set light source.
Next, when the polygon data has a two-dimensional texture, the three-dimensional map drawing unit 34 pastes the texture to the polygon (S60). The UV coordinates of the texture define the correspondence between the polygon vertex and the texture. The three-dimensional map drawing unit 34 deforms the texture in accordance with the correspondence relationship and attaches the texture to the polygon.

  Then, the control procedure of the color of the high feature is demonstrated using FIG. FIG. 8 is an example of a flowchart showing the procedure of the process of step S20 of FIG.

  First, the three-dimensional map drawing unit 34 determines which season the feature to be drawn included in the mesh is drawn (S20-2). For example, if it is a season at the time of drawing, the season to which the current month and day belong is determined with reference to a table in which the month and the season are associated, or the like. Alternatively, the season specified by the user is acquired.

  Next, the three-dimensional map drawing unit 34 reads out the color information 80 of the determined season among the color information 80 of the mesh to be drawn (S20-4). That is, the color information 80 of the season determined in step S20-2 is read out of the color information 80 of spring and winter associated with the mesh (longitude and latitude) to be drawn. In addition, if the mesh is decided, the altitude is also decided.

  Next, the three-dimensional map drawing unit 34 determines whether it is necessary to change the color of the mesh to be drawn (S20-6). That is, it is determined whether the color information 80 read out in step S20-4 is white or an initial value.

  If the determination in step S20-6 is YES, there is a high possibility that snow is deposited on the mesh to be drawn, so the three-dimensional map drawing unit 34 changes the vertex color of the polygon of the drawn object to white (S20) -8).

  If the determination in step S20-6 is No, the three-dimensional map drawing unit 34 does not change the vertex color of the polygon of the feature to be drawn because the possibility of snow coverage on the mesh to be drawn is low. Leave as it is.

  By the above processing, the color of the feature can be changed according to the elevation of the mesh to be drawn. Since the elevations of the polygons included in the same mesh are the same, the process of FIG. 8 may be performed once for each mesh.

<Drawing example>
FIG. 9 is a diagram showing a drawing example of a feature according to the season of the mesh to be drawn. In FIG. 9, the terrains of the meshes 81 to 84 described in FIG. 6 are drawn as polygons for each season. Note that, for convenience of description, the feature shown in FIG. 9 is not a feature included in only one mesh but a feature included in a plurality of meshes.

  According to FIG. 6, since the spring color information 80 associated with the mesh 84 in the inland part of Hokkaido is white, the polygon corresponding to the mesh 84 is drawn in white. The adjacent meshes are also drawn in white based on the color information 80 of the meshes.

  Since the summer color information 80 associated with the mesh 84 remains the initial value, the polygon corresponding to the mesh 84 is drawn with the initial value. Adjacent meshes are also drawn with initial values. The initial value is green, gray, brown or the like.

  Since the autumn color information 80 associated with the mesh 84 is white, the polygon corresponding to the mesh 84 is drawn in white. Although the meshes in the vicinity are also drawn in white based on the color information 80 of the mesh, the remaining meshes are drawn with initial values.

  Since the winter color information 80 associated with the mesh 84 is white, the polygon corresponding to the mesh 84 is drawn in white. The adjacent meshes are also drawn in white based on the color information 80 of the meshes.

  The spring color information 80 associated with the mesh 83 on the Pacific side in the Tohoku region remains the initial value, so the polygon corresponding to the mesh 83 is drawn with the initial value. Adjacent meshes are also drawn with initial values. The same is true for summer and autumn.

  Since the winter color information 80 associated with the mesh 83 is white, the polygon corresponding to the mesh 83 is drawn in white. The adjacent meshes are also drawn in white based on the color information 80 of the meshes.

  The spring color information 80 associated with the mesh 82 along the mountain on the Japan Sea side is white, so the polygon corresponding to the mesh 82 is drawn in white. The adjacent meshes are also drawn in white based on the color information 80 of the meshes.

  Since the summer color information 80 associated with the mesh 82 remains the initial value, the polygon corresponding to the mesh 82 is drawn with the initial value. Adjacent meshes are also drawn with initial values. The same is true for autumn.

  Since the winter color information 80 associated with the mesh 82 is white, the polygon corresponding to the mesh 82 is drawn in white. The adjacent meshes are also drawn in white based on the color information 80 of the meshes.

  Since the color information 80 associated with the mesh 81 of the Kanto plain remains the initial value, the polygon corresponding to the mesh 81 is drawn with the initial value. Adjacent meshes are also drawn with initial values. The same is true for summer and winter.

  As described above, the map display system 100 according to the present embodiment has the color information 80 associated with the season, the altitude, and the latitude and longitude, so that the color of the feature is drawn when drawing the feature to be drawn. Can be changed according to the elevation, season and latitude / longitude of a feature.

  In the first embodiment, the color information 80 is registered in the map data and the color of the feature is determined only from the color information 80. However, in the present embodiment, the ground is made using snowfall information or snowfall information provided as weather information. A map display system 100 for determining the color of an object will be described.

  FIG. 10: is an example of the functional block diagram which illustrated each function with which the map display system 100 of a present Example is equipped. In the present specification (this embodiment), the components given the same reference numerals in FIG. 4 perform the same function, and therefore, mainly the main components of this embodiment may be described.

  A weather data server 23 is shown in the map display system 100 of FIG. The weather data server 23 has a snowfall / snowfall DB 52. In the snowfall and snowfall DB 52, the presence or absence of snowfall and snowfall in real time is registered for each mesh. Since the elevation of the mesh is clear, it is now known whether there is snow or snowfall according to the elevation.

  The server transmission / reception unit 51 of the weather data server 23 transmits snowfall information or snowfall information (hereinafter referred to as snowfall / snowfall information) read from the snowfall / snowfall DB 52 periodically or upon request from the server 21 to the server 21.

  Therefore, according to the present embodiment, since the server 21 can acquire snowfall / snowfall information in real time, it is possible to draw a three-dimensional map close to a landscape in real space.

FIG. 11 is an example of a flowchart showing the procedure of the process of step S20 of FIG.
In FIG. 11, processes of steps S20-1 and S20-10 different from FIG. 9 will be mainly described.

  First, the three-dimensional map drawing unit 34 determines whether snowfall / snowfall information of the mesh to be drawn can be used (S20-1). Since snowfall and snowfall information can not be used for all meshes, it is possible to determine whether to use the color information 80 of the map data or the weather information by this determination. If the determination in step S20-1 is NO, the three-dimensional map drawing unit 34 performs the process of step S20-2 and subsequent steps.

  If the determination in step S20-1 is YES, the three-dimensional map drawing unit 34 sets the color of the drawn feature according to the snowfall and snowfall information (S20-10). That is, since the presence or absence of snowfall and snowfall on the mesh whose elevation is known can be known, the color of the feature can be adjusted according to the elevation.

  Therefore, according to the map display system 100 of the present embodiment, while the color information 80 of the map data lacks real-time property, it is possible to draw a feature in a mode close to the landscape of the real space. In addition, if snowfall information is obtained, it becomes possible to draw white features in areas where snow coverage is difficult, such as the Kanto plain. Further, even if snowfall and snowfall information can not be obtained, the color of the feature can be determined by the color information 80 of the map data.

  In the present embodiment, features to be drawn other than white will be described.

<Draw in autumnal color>
FIG. 12 is an example of a diagram for explaining the color information 80 according to the autumn leaves front and the presence or absence of the autumn leaves from September to December. An area 91 surrounded by a circle shown in FIG. 12 is an area in which the autumn leaves are at their best. In the area 91, the place where autumn leaves can actually be appreciated is mainly in the mountainous area. In addition, the higher the altitude where the temperature is likely to fall, the colored leaves turn faster.

  Referring to the area 91 of FIG. 12, the Hokkaido region is a full-color view in September, the Hokkaido region and the Hokuriku region are full-color view in October, and the north of the Chubu region is a full-color view in November. In December, a part of Kyushu, a part of Kansai area and a part of Kanto area are in full bloom. However, in actuality, whether or not the autumn leaves can be viewed according to the elevation in the area 91 is different.

  As in the case of Example 1, the observer obtains information of the autumn leaves at a certain moment (for example, every day to every month) from September to December for each mesh, and refers to the elevation data of each mesh to obtain seasons and elevations. The color information of the autumnal leaves associated with the latitude and longitude can be registered in the map DB 1001. Autumn leaves are colors that represent red leaves such as red to yellow.

  Therefore, as the map DB 1001 has such color information 80, the three-dimensional map drawing unit 34 can change the color of the feature of the mesh to the color of autumn leaves. As in the second embodiment, real-time autumnal color information may be used.

  The drawing procedure of the feature by the autumnal color may be controlled in the same manner as in FIGS. 8 and 11 as long as the vertex color of the polygon is changed to the autumnal color in step S20-8 in FIG. 8 and FIG.

<Drawn in cherry color>
Some famous cherry blossom spots in Japan are known in Japan. It is known that the flowering of cherry blossoms is affected by the altitude because the correlation with the temperature is strong. Generally, it is said that flowering is delayed by about 2 to 3 days for every 100 m elevation. For this reason, in February to May when cherry blossoms bloom, the time when cherry blossoms bloom differs according to the elevation of the mesh.

  Therefore, from February to May, the observer observes the flowering of the cherry blossoms in a specific area called a cherry blossom spot at a certain moment (for example, every day to every month) in September to December. The cherry color information associated with each other can be registered in the map DB 1001. In the case of cherry blossoms, it blooms earlier from lower elevations.

  Further, as shown in FIG. 13, in the case of cherry blossoms, the three-dimensional map drawing unit 34 may draw not cherry trees but colors. FIG. 13 is an example of a diagram schematically showing a flowering state of cherry blossoms in an area called a cherry blossom famous place. FIG. 13 (a) shows a drawing example of a mountain when the flowering time of the cherry blossoms is not present, and FIG. 13 (b) shows a drawing example of the mountains when the flowering time of the cherry blossoms. FIG. 13 (a) is a drawing example of a feature that is not in the flowering time, so a cherry tree without flowers is created and drawn with icons and polygons. FIG. 13 (b) is an example of drawing a feature at the flowering time, but a cherry blossom tree that blooms at a low elevation is created and drawn as an icon or polygon. Also, at high elevations, cherry trees without flowers are created and drawn with icons and polygons.

  The drawing as shown in FIG. 13 can be obtained by arranging a cherry tree on a mesh in which the cherry color is associated with the color information 80.

  Therefore, the user can browse a more realistic electronic map according to the flowering time of the cherry blossoms different depending on the altitude.

  In addition, also in the drawing by autumn color and cherry color, when the color information 80 is managed by both the season and, for example, every month (each of January to December), in a shorter period (every month in this example) Settings may be prioritized.

  On the other hand, it is preferable that the width of one mesh be narrow in the drawing by the autumnal leaves and the cherry blossoms. Changes in color due to autumn leaves or cherry blossoms do not occur unless there is a corresponding tree. Also, the range in which these trees are continuously distributed is not limited to a wide range.

  Therefore, when the color information 80 of autumn color and cherry color is managed by both the wide area mesh and the narrower mesh, the setting of the narrower area may be prioritized. This is because it is easier to match the color of the three-dimensional map and the color of the real space when the range is narrow.

<Apply gradation>
As described above, since the three-dimensional map drawing unit 34 changes the color of the feature from a certain altitude up and down, there is a possibility that the user may feel unnatural when browsing the electronic map. For this reason, it is effective to apply a gradation from the color of the initial value to white (or colored leaves, cherry blossoms) at the elevation at which the color changes. For example, in the case where adjacent meshes have different colors, the three-dimensional map drawing unit 34 applies a gradation that gradually changes from the initial color to white for the color of the polygon serving as the mesh boundary.

  FIG. 14A is an example of a diagram for schematically explaining the application of gradation, and FIG. 14B is a drawing showing an example of drawing a feature to which gradation is applied. In FIG. 14A, the gradation is applied to the white mesh which is the boundary between the initial mesh and the white mesh. As a result, as shown in FIG. 14B, the color of the feature can be naturally changed from the initial value to white.

  Therefore, according to the present embodiment, it is possible to draw the feature in a fall-off color other than white or a cherry color according to the altitude. In addition, unnaturalness can be reduced even if the color is switched at a certain altitude by gradation.

Other Preferred Applications
As described above, the best mode for carrying out the present invention has been described using the examples, but the present invention is not limited to these examples at all, and various modifications can be made without departing from the scope of the present invention. And substitution can be added.

  For example, although a mountain is described as an example of a high elevation feature in the present embodiment, the invention may be applied to other features such as a canyon located at a high elevation location. In addition, the color of a building (a house, a building, a bridge, a road, etc.) located at a high elevation according to the color information 80 may be changed to white according to the season.

  Moreover, although the color of polygon data was changed in this embodiment, you may draw snowfall, autumn leaves, or flowering of a cherry tree by sticking a texture. A color or texture is one of the attributes for drawing a feature, and for example, white, autumnal leaves and cherry colors designated as colors are attribute values.

  Further, in the present embodiment, the electronic map of Japan has been described as an example, but the drawing method of the electronic map of the present embodiment can be applied also when displaying maps of foreign countries such as the United States, Europe, Asia.

  Moreover, although the server 21 created the electronic map in this embodiment, the terminal 22 may create the electronic map. In this case, the terminal 22 can access the map DB 1001, the road network DB 1002, and the pedestrian network DB 1003.

  Further, although one server 21 is illustrated in FIG. 4, a plurality of servers 21 may exist. Moreover, the function which one server 21 has may be distributed and arrange | positioned at a some server. As such a configuration, so-called cloud computing technology may be used in which the physical location of the server 21 is not identified.

Reference Signs List 21 server 22 terminal 31 server transmission / reception unit 32 navigation screen generation unit 33 route search unit 34 three-dimensional map drawing unit 80 color information 81 to 86 mesh 100 map display system

Claims (3)

An information processing apparatus for creating an electronic map using map data having three-dimensional information, comprising:
Color information of the polygon data for drawing the features that are affected by the altitude and seasonal areas to be drawn is registered in association with the altitude and the season for each of the regions partitioned by the longitude and latitude Reading means for reading the color information from the map information storage means according to the area to be drawn, the altitude and the season ;
Snow information acquisition means for acquiring real-time snow information that affects the color information of the features included in the area;
When real-time snowfall information affecting the color information of a feature included in the area can be acquired , the polygon data for drawing the feature is drawn based on the snowfall information acquired by the snowfall information acquisition means. When color information is changed to draw the features of the area expressed in three dimensions and the real-time snowfall information can not be acquired, the reading means expresses in three dimensions using the color information read out. Feature drawing means for drawing features of the area;
Electronic map creating means for creating an electronic map including the features drawn by the feature drawing means;
An information processing apparatus having An information processing apparatus for creating an electronic map using map data having three-dimensional information, comprising:
Map color information of the polygon data for drawing the features that are affected by the altitude and seasonal areas to be drawn is that is registered in association with the altitude and the season for each of the areas was divided by the longitude and latitude Reading means for reading out the color information from the information storage means according to the area to be drawn, the elevation and the season ;
Information acquisition means for acquiring real-time autumnal leaves information or flowering information of cherry blossoms affecting the color information of the features included in the area;
When real-time autumnal leaves information or cherry blossoming information affecting the color information of the features included in the area can be acquired , drawing of the terrestrial features based on the autumnal information acquired by the information acquisition means or the cherry blossoming information of the cherry blossoms Changing the color information of the polygon data for drawing to draw the features of the area expressed in three dimensions, and when the real-time autumn leaf information or the flowering information of Feature drawing means for drawing the features of the area expressed in three dimensions using the color information ;
Electronic map creating means for creating an electronic map including the features drawn by the feature drawing means;
An information processing apparatus having A map display system comprising an information processing apparatus for creating an electronic map using map data having three-dimensional information, and a terminal for displaying the electronic map,
Map color information of the polygon data for drawing the features that are affected by the altitude and seasonal areas to be drawn is that is registered in association with the altitude and the season for each of the areas was divided by the longitude and latitude Reading means for reading out the color information from the information storage means according to the area to be drawn, the elevation and the season ;
Snow information acquisition means for acquiring real-time snow information that affects the color information of the features included in the area;
When real-time snowfall information that affects the color information of a feature included in the area can be acquired, the color information of polygon data for drawing a feature is changed based on the snowfall information, and three-dimensional Drawing the feature of the area represented by and if the real-time snow information can not be acquired, the feature of the area expressed in three dimensions is drawn using the color information read out by the reading means Feature drawing means to
Electronic map creating means for creating an electronic map including the feature drawn by the feature drawing means;
The terminal receiving means for receiving the electronic map;
And display means for displaying the electronic map on a display device.