JP7145807B2 - MAP DISPLAY DEVICE, MAP DISPLAY SYSTEM, PROGRAM AND MAP DATA GENERATOR - Google Patents

Description

The present invention relates to a map display device or the like that displays a map image showing a predetermined route.

For example, in Patent Document 1, in order to ensure visibility, an image of a road included in a cruising route that can be traveled until the vehicle's remaining cruising distance reaches a predetermined amount is replaced with a plurality of rectangular images and displayed. A navigation device is disclosed. The plurality of rectangular images are positioned and sized to enclose some or all of the area to be occupied by the reachable route.

Patent No. 6021024

However, in the technology disclosed in Patent Document 1, in the case of displaying a map image including figures indicating seas and rivers, if road images included in the navigable route are simply replaced with a plurality of rectangular images, the seas and rivers can be displayed. The rectangular image is superimposed on the illustrated figure, and a portion of the sea or river is also displayed as a travelable range, which may reduce the accuracy of the map image.

SUMMARY OF THE INVENTION An object of the present invention is to provide a map display device, a map display system, a program, and a map data generation device capable of displaying a map image that appropriately represents a predetermined route.

A map display device according to a first aspect of the present disclosure includes a display unit configured with two or more pixels to display a map image showing a map, and display information indicating at least a color to be displayed on the display unit for each of the pixels. from the first map data representing the road figure indicating the road corresponding to the searched predetermined route and the natural object figure indicating the natural object based on the display information, to the natural object figure based on the position of the natural object figure a map data generation unit for generating second map data in which the display information corresponding to the expanded road figure obtained by expanding the road figure to a predetermined range while maintaining the corresponding display information is changed, and a display control unit that causes the display unit to display the map image representing the extended road figure and the natural object figure based on the above.

In the map display device according to the first aspect, the natural object is a land and water area including at least the sea and a river, and the map data generation unit converts the display information corresponding to the extended road figure to the first map data. It is characterized by changing to second display information indicating a second color different from the color to be displayed.

In the map display device according to the first aspect, the map data generating unit temporarily converts the display information corresponding to the outside of the first expanded road graphic obtained by expanding the road graphic into third display information indicating a third color. and the display information that is not the third display information and does not correspond to the natural object figure is changed to the second display information, and the road figure is expanded in a range that does not overlap with the natural object figure. It is characterized by generating an extended road figure.

In the map display device according to the second aspect of the present disclosure, the map data generation unit generates a first extended road figure by extending the road figure, and generates a third extended road figure by excluding the natural object figure from the first extended road figure. The display information corresponding to the extended road figure is changed to the second display information.

The map display device of the first aspect and the second aspect further includes a search unit that searches for the route, and the map data generation unit draws the first map data based on the route searched by the search unit. characterized by

In the map display devices of the first aspect and the second aspect, the map data generation unit draws two or more polygonal figures along the outer periphery of the road figure, and draws the road figure and the polygonal figure. Generate the first extended road figure to be constructed.

The map display device of the first aspect and the second aspect further includes a current location information acquiring unit that acquires current location information indicating the current location of the moving object, and the searching unit obtains the current location information and an energy source for driving the moving object. Based on the information indicating the remaining amount of fuel or battery, the route on which the moving object can travel is searched for, starting from the current location.

A map display system according to a third aspect of the present disclosure includes a display device configured with two or more pixels and displaying a map image showing a map, and a server communicating with the display device, wherein the server includes the display A first map having display information indicating at least a color to be displayed on the device for each pixel, and showing a road figure indicating a road corresponding to a predetermined route searched and a natural object figure indicating a natural object based on the display information. second map data obtained by changing the display information corresponding to the extended road figure obtained by extending the road figure to a predetermined range while maintaining the display information corresponding to the natural figure based on the position of the natural figure, from the data; and the display device displays the map image representing the extended road figure and the natural object figure based on the second map data.

A program according to a fourth aspect of the present disclosure provides a computer comprising a display unit configured with two or more pixels and displaying a map image showing a map, and displaying display information indicating at least a color to be displayed on the display unit for each of the pixels. from the first map data representing the road figure indicating the road corresponding to the searched predetermined route and the natural object figure indicating the natural object based on the display information, the natural object figure based on the position of the natural object figure a map data generating unit for generating second map data in which the display information corresponding to the expanded road figure expanded to a predetermined range while maintaining the display information corresponding to the second map data is changed; is functioned as a display control unit for displaying the map image representing the extended road figure and the natural object figure on the display unit.

A map data generation device according to a fifth aspect of the present disclosure includes a communication unit configured with two or more pixels and connected to a display device that displays a map image showing a map, and at least a color to be displayed on the display device. position of the natural object figure from first map data having display information for each pixel and representing a road figure showing a road corresponding to the searched predetermined route and a natural object figure showing a natural object based on the display information; a map data generating unit for generating second map data in which the display information corresponding to the expanded road figure obtained by extending the road figure to a predetermined range is changed while maintaining the display information corresponding to the natural object figure based on and a communication control section for transmitting the second map data representing the extended road figure and the natural object figure to the display device via the communication section.

According to the present invention, it is possible to display a map image that appropriately represents a predetermined route without overlapping the extended road figure and the natural object figure.

1 is a schematic configuration diagram of a navigation device according to a first embodiment of the present invention; FIG. FIG. 4 is an image diagram when a map image based on the first map data is displayed on the display unit; FIG. 4 is an image diagram showing a first extended road figure; FIG. 11 is an image diagram showing a process of drawing a first extended road figure by a drawing unit; FIG. 10 is an image diagram when a map image based on second map data is displayed on the display unit; 4 is a flowchart showing a travelable area display process; FIG. 9 is a diagram showing an example of a map image displayed by a navigation device according to a second embodiment of the present invention; FIG. FIG. 11 is a schematic configuration diagram showing a map display system according to a third embodiment of the present invention;

<<First Embodiment>>
FIG. 1 is a schematic configuration diagram of a navigation device 1 according to a first embodiment of the present invention. A navigation device 1 is mounted on a mobile object. A moving object is a vehicle or a person. Vehicles include electric vehicles, gasoline vehicles, motorcycles such as motorcycles, wheelchairs, and electric bicycles. In this embodiment, the moving object is an electric vehicle. The navigation device 1 is connected via an in-vehicle LAN to electrical components provided in the vehicle, such as an audio system, an air conditioner, a body control section, and a battery control section. Therefore, the navigation device 1 can acquire vehicle information about the own vehicle from the electrical components. The vehicle information includes remaining amount information indicating the remaining amount of the battery, which is the energy source for driving the vehicle, and fuel consumption information indicating the distance that the vehicle can travel with a predetermined amount of electric power. The vehicle information may include information indicating the number of passengers in the vehicle.

The navigation device 1 performs a travelable area display process for displaying the travelable area of the vehicle and a route guidance process for guiding the route from the departure point to the destination. The drivable area is a range in which it is predicted that the vehicle can continue to travel with the remaining battery power, starting from the current location of the vehicle. Such a navigation device 1 includes a display section 20 , an input section 30 , a storage section 40 , a GPS (Global Positioning System) sensor 10 and a control section 50 .

The display unit 20 displays a map image showing the drivable area when executing the drivable area display process. The display unit 20 also displays a map image necessary for route guidance when executing route guidance processing. A map image is composed of two or more pixels. In this embodiment, the display unit 20 is a display.

The input unit 30 inputs various instructions to the control unit 50 based on user's operations. The input unit 30 is composed of, for example, a touch panel, various switches, a voice input device, and the like. The touch panel is configured integrally with the display unit 20 . The input unit 30 inputs instructions from the user to the control unit 50 . Instructions from the user include an instruction to execute a travelable area display process, an instruction to set a destination for which route guidance is desired, and the like.

The storage unit 40 stores various programs executed by the navigation device 1, map information, and the like. The storage unit 40 also temporarily stores information necessary for various processes. The storage unit 40 is composed of, for example, a flash memory or the like.

The map information includes information on roads and information on natural objects. A natural object is an object existing in the natural world, not an artificial object such as a road or a building. Natural objects include, for example, seas, inland waters such as rivers and lakes, forests, valleys, and natural parks such as national parks.

Information about roads includes road coordinate information and road color information. Road coordinate information is information indicating the coordinates of an existing road. The coordinates of the road are represented by a combination of nodes 61g and links 61o shown in FIG. The node 61g indicates positions such as intersections, ends of roads, points where road types such as prefectural roads and national roads change, and points where road widths change. Node 61g is identified by latitude and longitude, for example. A link 61o connects adjacent nodes 61g and 61g and represents a road section between the nodes 61g and 61g. Each link 61o is associated with a corresponding link ID (identification). Such road coordinate information represents the shape of the road figure representing the road in the map image. The road color information is information indicating the color of the road figure to be displayed on the display unit 20 shown in FIG. Roads include roads formed on land, roads formed on bridges connecting islands, roads formed on bridges over rivers, and the like.

The road information includes information indicating at least one of road curvature, road gradient, road orientation, road speed limit, road traffic direction, road type, and road name for each link ID. may contain. Road types include, for example, highways, national roads, prefectural roads, and narrow streets. Road names include, for example, expressway names and interchange names.

The information about natural objects includes natural object shape information and natural object color information. The natural object shape information includes information representing the coordinates of an existing natural object, and indicates the shape of the natural object figure representing the natural object in the map image. The shape of the natural object figure is the shape when the natural object is viewed from above. In the natural object shape information, the coordinates of the natural object are specified by latitude and longitude, for example. The natural object color information is information indicating the color of the natural object figure to be displayed on the display unit 20 . The information on natural objects may also include information indicating the name of the natural object. The names of natural objects include names of seas, rivers, and natural parks.

The map information may further include information on buildings and information on facilities. The building information includes building shape information, building color information, and building name information. The building shape information indicates the shape of a building figure representing a building by combining two or more line segments in the map image, and includes information indicating the coordinates of the start point and the end point of each line segment. The coordinates of the start point and the coordinates of the end point are represented by latitude and longitude, for example. The shape of the building figure is the shape when the building is viewed from above. The building color information is information indicating the color of the building graphics displayed on the display unit 20 . The building name information is information indicating the name of the building.

Facilities include, for example, charging stations, gas stations, hospitals, police stations, fire stations, railway stations, convenience stores and supermarkets. The facility information includes information indicating the coordinates of the facility and information indicating the mark of each facility to be displayed on the map image. The facility coordinates are represented by latitude and longitude, for example.

In this embodiment, the navigation device 1 uses the same map information for the drivable area display process and the route guidance process, but is not limited to this configuration. may be used. In this configuration, the navigation device 1 uses, for example, general map information that accurately represents the shapes of existing roads, the network of roads, and the like in route guidance processing. Then, the navigation device 1 may use map information mainly including cost information such as the distance between the nodes 61g and the required time in the travelable area display process.

A GPS sensor 10 shown in FIG. 1 receives radio waves from GPS satellites and acquires current location information indicating the current location of a vehicle in which the navigation device 1 is mounted. In this embodiment, the current location information is information indicating latitude and longitude. The GPS sensor 10 corresponds to a current location information acquisition unit.

The control unit 50 includes a map matching unit 51 , a search unit 52 , a drawing unit 53 , a display control unit 54 and a guidance unit 55 .

The map matching unit 51 performs map matching processing based on the information received by the GPS sensor 10 and the map information. The map matching process is a process of correcting the information indicating the latitude and longitude received by the GPS sensor 10 to the position on the road figure represented by the map data. The map matching unit 51 acquires map information from the storage unit 40, superimposes the position of the vehicle represented by the information indicating the latitude and longitude received by the GPS sensor 10 on the map information, and maps the road corresponding to the superimposed position. Find link 61o. Subsequently, the map matching unit 51 acquires link ID information corresponding to the obtained link 61o.

The search unit 52 searches for a predetermined route. In this embodiment, the predetermined route includes a travelable route searched in the travelable area display process and a route from the departure point to the destination searched in the route guidance process. Note that the predetermined route may include a route through which vehicles, people, etc. can travel at the time of or immediately after the occurrence of a disaster such as an earthquake or typhoon. Also, the predetermined route may include a route through which vehicles and people can travel during events such as marathon events that are accompanied by road closures and traffic jams. When searching for a passable route as described above, the search unit 52 uses information transmitted by the national government, local governments, event organizers, and the like.

When performing the travelable area display process, the search unit 52 searches for a travelable route based on the current location information, the vehicle information, and the map information. A drivable route is a route that is predicted to be continuously drivable starting from the current location without charging the battery, which is the energy source for the vehicle to travel, on the way.

When searching for a drivable route, the search unit 52 determines, for example, the type of road to be detected as a drivable route as a search condition. Then, the search unit 52 inputs the current location information, remaining amount information, fuel consumption information, and information indicating the slope and speed limit of the road to a predetermined calculation formula determined in advance for each vehicle type, and can travel from the current location. Identify the link IDs of the roads corresponding to all routes that are In addition, when the search target road branches off and extends in the vicinity of the current location, the travelable routes spread radially from the current location. In this embodiment, the travelable route is a one-way route from the current location, but may be a round-trip route. Further, when performing the travelable area display process, the search unit 52 may use information indicating the starting point input by the user via the input unit 30 instead of the current location information.

In the present embodiment, the searching unit 52 searches relatively wide roads such as expressways and national roads. When the navigation device 1 performs the travelable area display processing based on such search conditions, roads with relatively narrow widths can be excluded from the search targets, so the amount of data to be handled is suppressed, and the travelable area display processing is reduced. It can reduce the load. Further, the navigation device 1 can prevent a road that is too narrow for a vehicle to actually pass through from being extracted as a travelable route. Note that the search conditions are not limited to the conditions described above, and all types of roads may be searched.

When performing route guidance processing, the search unit 52 searches for a route from the current location to the destination based on the information indicating the destination input by the user via the input unit 30, the current location information, and the map information. .

The drawing unit 53 generates map data used in the travelable area display process and map data used in the route guidance process based on the predetermined route searched by the search unit 52 . Such a drawing unit 53 corresponds to a map data generation unit.

When performing the travelable area display process, the drawing unit 53 draws the first map data as shown in FIG. 2, for example, based on the travelable route and the map information. FIG. 2 is an image diagram when a map image 60 based on the first map data is displayed on the display unit 20. As shown in FIG. The first map data has two or more pieces of display information. This display information indicates the color displayed on the display unit 20 . The display information is, for example, information indicating the mixing ratio of red, green, and blue per pixel of the map image when colors are represented by RGB (Red-Green-Blue) colors. The display information may further include at least one of luminance information indicating luminance and transparency information indicating color transparency. The first map data has such display information for each pixel of the map image.

The drawing unit 53 adjusts the display information for each pixel and draws first map data representing two or more road figures 61, a natural object figure 62, and a mark P indicating the current location of the vehicle. That is, the drawing unit 53 acquires information about roads from the storage unit 40 based on the link ID of the travelable route searched by the search unit 52 . The drawing unit 53 then sets display information corresponding to the road coordinate information and the road color information, and draws the road figure 61 . The drawing unit 53 also acquires information about natural objects from the storage unit 40 based on the link ID of the travelable route searched by the search unit 52 . Then, the drawing unit 53 sets display information corresponding to the natural object shape information and the natural object color information, and draws the natural object figure 62 .

When drawing the natural object figure 62 , the drawing unit 53 causes the storage unit 40 to store the position corresponding to the display information representing the natural object figure 62 , that is, the position of the natural object figure 62 . The position of the natural object figure 62 is indicated, for example, by information indicating latitude and longitude, X, Y coordinate values in the first map data, and the like. In FIG. 2, the natural object figure 62 represents the sea. Also, in FIG. 2, the natural object figure 62 is shown with oblique lines for the sake of convenience. The natural object figure 62 may be drawn at two or more positions with a road figure 61 representing a road formed on a bridge or the like interposed therebetween. In such a case, the drawing section 53 stores the position of each natural object figure 62 in the storage section 40 .

The drawing unit 53 may also set display information corresponding to the information indicating the name of the road and the information indicating the name of the natural object, and draw a character figure indicating the name of the road or the natural object. Further, the drawing unit 53 may set display information corresponding to the information about the building, and draw a building figure, a character figure indicating the name of the building, or the like.

The drawing unit 53 sets the display information corresponding to the figure representing the land in the area other than the figure. The drawing unit 53 draws the road figure 61 after drawing the background figure of the map image such as the natural object figure 62 and the building figure. When the drawing unit 53 further draws a character graphic, it draws the character graphic after the road graphic 61 .

Thus, the navigation device 1 draws the first map data. Therefore, in the navigation device 1, the drawing unit 53 can generate three-dimensional map data in which figures indicating roads, buildings, etc. are appropriately expressed in 3D (three dimensions) during route guidance processing. The navigation device 1 is not limited to the configuration of drawing the first map data, and may be configured to generate the first map data by superimposing a layer representing the road figure 61 and a layer representing the natural object figure 62 and the like.

The drawing unit 53 draws the second map data based on the first map data. The second map data is data representing a travelable area.

In drawing the second map data, the drawing unit 53 extracts the road graphics 61 corresponding to the link ID of the road that is the travelable route from among the road graphics 61 represented by the first map data. Hereinafter, this road figure 61 will also be referred to as "first road figure", and the road figure 61 that does not correspond to the link ID of the road that is the travelable route will also be referred to as "second road figure". That is, the road graphic 61 is composed of a first road graphic and a second road graphic. Subsequently, the drawing unit 53 changes the display information corresponding to the first road figure to display information indicating a predetermined color. From the viewpoint of visibility when the map image is displayed on the display unit 20, the predetermined color is preferably a color different from the color represented by the first map data. Hereinafter, the color represented by the first map data will be referred to as the "first color", and the predetermined color will also be referred to as the "second color". It is preferable that the second display information indicating the second color has a transmittance of 40% or more and 80% or less. Further, it is more preferable to set the transmittance to 50% or more and 70% or less. It should be noted that the transmittance is not limited to this range, and other numerical values may be used.

FIG. 3 is an image diagram showing the first extended road graphic 63. As shown in FIG. FIG. 4 is an image diagram showing the process of drawing the first extended road graphic 63 by the drawing unit 53. As shown in FIG. The first expanded road graphic 63 is a graphic obtained by expanding the first road graphic 61a to a predetermined range.

As shown in FIG. 4, the drawing unit 53 draws two or more quadrilateral figures 61b representing quadrilaterals along the outer periphery of the first road figure 61a using a predetermined calculation formula. As the predetermined calculation formula, for example, a calculation formula is used that makes the first extended road graphic 63 displayed on the display unit 20 look curved. The drawing unit 53 draws the rectangular graphic 61b such that the length 61f of the rectangular graphic 61b in the width direction of the first road graphic 61a is equivalent to, for example, a distance of 1 kilometer. The drawing unit 53 also draws two or more triangular figures 61c, which represent triangles whose vertices are gathered at the end part 61e, continuously in a fan shape at the end part 61e of the first road figure 61a. As a result, the drawing unit 53 can draw the first extended road graphic 63 having a contour close to a curved line. In this manner, the drawing unit 53 draws the first extended road graphic 63 by combining the first road graphic 61a, the square graphic 61b, and the triangular graphic 61c. In the first extended road graphic 63 drawn in this manner, when the road corresponding to the drivable route branches and merges, the missing part 63a is included in the outline of the first extended road graphic 63 as shown in FIG. is formed. The missing part 63a is formed in an area of a predetermined range or more where the first road figure 61a is not drawn.

Note that the drawing unit 53 is not limited to the configuration for drawing a polygonal figure such as a quadrangle or a triangle as described above, and may be configured to draw a curved line. In that configuration, the drawing unit 53 draws the first extended road graphic 63 with a curved line.

Next, the drawing unit 53 temporarily changes the display information corresponding to the outside of the first extended road graphic 63 to third display information indicating a third color different from the second color. Specifically, the drawing unit 53 determines whether the display information of the first map data corresponding to the pixel 65a1 in the first row of the first column of the map image 65 shown in FIG. If it is determined that the display information does not represent the first extended road graphic 63, the display information is changed to the third display information. Subsequently, the drawing unit 53 determines whether or not the display information corresponding to the pixel 65b1 in the second column and the first row adjacent to the pixel 65a1 is the display information representing the first extended road figure 63. When it is determined that the display information does not represent the first extended road figure 63, the display information is changed to the third display information. The drawing unit 53 repeats the process of changing to the third display information until it determines that the display information represents the first extended road graphic 63 . When the drawing unit 53 determines that the display information represents the first extended road figure 63 , the processing target is changed to the display information corresponding to the pixel 65 a 2 in the first column and second row of the map image 65 . That is, the drawing unit 53 selects the second end opposite to the first end 65A from the display information corresponding to the first end 65A composed of the pixels 65a1, 65a2, . . . The change processing to the third display information is performed for the display information corresponding to the portion 65B. 65n1 of the first row of the map image 65, the drawing unit 53 selects the fourth end opposite to the third end 65C from the display information corresponding to the third end 65C composed of the pixels 65a1, 65b1, . . . The change processing to the third display information is performed toward the display information corresponding to the portion 65D. Further, the drawing unit 53 performs the process of changing the display information corresponding to the second end portion 65B to the display information corresponding to the first end portion 65A to the third display information described above. Further, the drawing unit 53 performs the process of changing the display information corresponding to the fourth end portion 65D to the display information corresponding to the third end portion 65C to the third display information described above.

Note that the process of changing to the third display information is performed by changing the first map data, and the third display information is not displayed on the display section 20 . In the case of the processing related to the display on the display unit 20, the navigation device 1 needs to execute the processing at a certain processing speed. can be suppressed.

Next, the drawing unit 53 determines that the display information other than the third display information is the display information representing the inside of the outline of the first extended road graphic 63, and changes it to the second display information. That is, the drawing unit 53 maintains the display information corresponding to the natural object figure 62 based on the position of the natural object figure 62 from the first map data, and the display information which is not the third display information and which does not correspond to the natural object figure 62, Change to the second display information. The drawing unit 53 also restores the third display information to the original display information. As a result, even when the first extended road figure 63 overlaps the natural object figure 62, the drawing unit 53 expands the first road figure 61a within a range that does not overlap the natural object figure 62, as shown in FIG. A second map data representing the second extended road figure 64 is generated. FIG. 5 is an image diagram when the map image 65 based on the second map data is displayed on the display unit 20. As shown in FIG. In the example shown in FIG. 5, the display information corresponding to the natural object figure 62 included in area A is maintained from the first map data shown in FIG. It should be noted that the range of the natural object figure 62 maintained from the first map data is shown by drawing thin oblique lines in FIG. The second map data expresses the amoeba-shaped second extended road graphic 64 as a travelable area.

The second extended road graphic 64 generated in this way does not have the missing part 63a even when the first extended road graphic 63 has the missing part 63a. The drawing unit 53 performs the process of changing to the third display information described above, for example, for all image information, determines whether or not the display information corresponds to the first extended road figure 63, It is possible to generate the second expanded road graphic 64 with a relatively small load, without the need to determine whether it corresponds to the inside or the outside of the outline of the first expanded road graphic 63 .

Further, the drawing unit 53 may acquire information about facilities from the storage unit 40, display marks indicating charging stations, gas stations, etc. based on the information about facilities, and generate the second map data. Thereby, the navigation device 1 can display charging stations, gas stations, etc. that exist within the travelable area on the map image 65 .

The navigation device 1 may be configured to generate the second map data by overlapping map layers. For example, the drawing unit 53 may be configured to superimpose a layer representing the natural object figure 62 on the map data representing the first extended road figure 63 . By stacking layers, it is easy to make detailed adjustments related to map data creation.

Further, when performing the process of changing the display information to the third display information, the drawing unit 53 temporarily lowers the resolution of the first map data, and displays the display information corresponding to the inner side of the outline of the first extended road figure 63 as the third display information. The resolution of the first map data may be returned to the original resolution at the time of changing to the second display information. The navigation device 1 having such a configuration can reduce the load of calculation processing.

Furthermore, when the drawing unit 53 generates the second extended road graphic 64, the information indicating the color and the transparency of the display information is changed. is changed.

When performing the route guidance process, the drawing unit 53 draws various images representing the route from the current location to the destination based on the information indicating the destination input by the user via the input unit 30, the current location information, and the map information. Draw the map data at the magnification of .

The display control unit 54 displays a map image based on the map data generated by the drawing unit 53 on the display unit 20 . Specifically, when the drivable area display process is performed, the display control unit 54 appropriately represents the drivable area composed of the natural object figure 62 and the second extended road figure 64 based on the second map data. The displayed map image 65 is displayed on the display unit 20 . In the map image 65 , the driveable area is displayed without overlapping the natural object figure 62 . Since the second extended road graphic 64 is displayed in a translucent color, the first road graphic 61a is displayed through the second extended road graphic 64. As shown in FIG. The navigation device 1 can also input the point corresponding to the position of the display unit 20 touched by the user to the control unit 50 as the destination.

Further, when route guidance processing is performed, the display control unit 54 causes the display unit 20 to display a map image corresponding to the route guidance. When performing the route guidance process, the guidance unit 55 guides the route to the destination by voice or the like.

Functions such as the control unit 50 described above are realized by software or the like. Software or the like is written as a program and stored in the storage unit 40 . A CPU (not shown) reads out and executes a program stored in the storage unit 40 to realize each function of the control unit 50 and the like.

FIG. 6 is a flow chart showing the travelable area display process. The travelable area display process performed by the navigation device 1 will be described with reference to FIG. The travelable area display process is started when an instruction to display the travelable area is input from the input unit 30 to the control unit 50 .

In step S<b>1 , the search unit 52 acquires current location information from the map matching unit 51 .

In step S<b>2 , the search unit 52 acquires map information from the storage unit 40 .

In step S3, the search unit 52 acquires vehicle information from the vehicle.

In step S4, the search unit 52 obtains a travelable route based on the current location information acquired in step S1, the map information acquired in step S2, and the vehicle information acquired in step S3, and indicates the travelable route. Identify the link ID corresponding to the road.

In step S5, the drawing unit 53 draws the first map data based on the map information obtained in step S2 and the travelable route obtained in step S4.

In step S6, the drawing unit 53 changes the display information representing the first road figure 61a in the first map data to the second display information. This first road graphic 61a corresponds to the road indicated by the link ID specified in step S4.

In step S7, the drawing unit 53 draws the first expanded road graphic 63 obtained by expanding the first road graphic 61a.

In step S8, the drawing unit 53 changes the display information corresponding to the outside of the first extended road graphic 63 to the third display information.

In step S9, the drawing unit 53 changes the display information that is not the third display information and does not correspond to the natural object figure 62 to the second display information. As a result, the drawing unit 53 generates second map data in which the second extended road graphic 64 appears.

In step S10, the display control section 54 displays a map image in which the second extended road figure 64 and the natural object figure 62 appear on the display section 20 based on the second image data. This map image shows the travelable area with the second extended road figure 64 .
<<Second embodiment>>
FIG. 7 is a diagram showing an example of the map image 165 displayed by the navigation device 100 according to the second embodiment of the invention. The navigation device 1 of the first embodiment generates the second extended road graphic 64 without the missing part 63a even when the first extended road graphic 63 has the missing part 63a. On the other hand, the navigation device 100 according to the second embodiment differs from the navigation device 1 according to the first embodiment in that there is a possibility that the third extended road figure 66 having the missing part 63a is generated. .

Specifically, the drawing unit 53 provided in the navigation device 100 according to the second embodiment draws a third extended road figure 66 by excluding the natural object figure 62 from the first extended road figure 63 based on the position of the natural object figure 62. do. Next, the drawing unit 53 changes the display information representing the third extended road graphic 66 to the second display information. Thereby, the navigation device 100 can display on the display unit 20 a map image showing the travelable area in which the missing part 63a is formed.
<<Third Embodiment>>
FIG. 8 is a schematic configuration diagram showing a map display system 200 according to the third embodiment of the invention. A map display system 200 includes a display device 202 and a server 201 .

The display device 202 includes a first communication section 270 , an input section 30 , a GPS sensor 10 , a display section 20 and a first control section 258 . The first controller 258 includes a display controller 54 and a first communication controller 257 . The configurations of the GPS sensor 10, the display unit 20, the input unit 30, and the display control unit 54 are the same as the configurations of the GPS sensor 10, the display unit 20, the input unit 30, and the display control unit 54 included in the navigation device 1 of the first embodiment. is. The first communication control section 257 controls the first communication section 270 to transmit and receive data to and from the server 201 .

The display device 202 transmits the current location information acquired by the GPS sensor 10 to the server 201 via the first communication unit 270 . The display device 202 also transmits the user's instruction input via the input unit 30 to the server 201 via the first communication unit 270 . Such a display device 202 is configured by a mobile terminal such as a smart phone or a tablet terminal, for example.

The server 201 includes a second control section 250 , a storage section 40 and a second communication section 271 . The second control section 250 includes a map matching section 51 , a search section 52 , a drawing section 53 and a second communication control section 256 . The configurations of the map matching unit 51, the search unit 52, the drawing unit 53, and the storage unit 40 are the same as the configurations of the map matching unit 51, the search unit 52, the drawing unit 53, and the storage unit 40 included in the navigation device 1 of the first embodiment. is. The second communication control unit 256 controls the second communication unit 271 to transmit and receive data with the display device 202 .

Second control unit 250 generates first map data and second map data based on the current location information transmitted from display device 202 and the map information stored in storage unit 40 . Server 201 transmits the second map data to display device 202 via second communication unit 271 . Such a server 201 corresponds to a map data generation device.

When the display device 202 receives the second map data from the server 201 via the first communication unit 270, the display control unit 54 causes the display unit 20 to display a map image based on the second map data.

Although the embodiments of the present invention have been described above, the device configuration, control method, and the like are not limited to the above-described embodiments.

For example, in the above embodiments, the map display device is the navigation device 1, 100, but is not limited to this configuration. For example, the map display device may be a portable terminal such as a smart phone, a tablet terminal, or a smart watch, or any other device provided with the display unit 20 .

Further, in the above-described embodiments, each function such as route search and map data drawing may be implemented by centralized processing by a single device, or may be implemented by distributed processing by two or more devices. .

Other configurations can also be modified in various ways without departing from the gist of the present invention. Also, the configurations of the above-described embodiment and modifications may be combined.

1, 100 navigation device 10 GPS sensor 20 display unit 52 search unit 53 drawing unit 54 display control unit 61 road figure 61b square figure 61c triangle figure 62 natural object figure 63 first extended road figure 64 second extended road figure 65 map image 66 th 3 extended road figure 200 map display system 201 server 202 display device

Claims (10)

a display unit configured with two or more pixels and displaying a map image showing a map;
a current location information acquisition unit that acquires current location information indicating the current location of a mobile object;
Based on the current location information and information indicating the remaining amount of fuel or battery as an energy source for running the moving body, Alternatively, a search unit that searches for a travelable route that is predicted to allow continued travel with the remaining amount of the battery;
Display information indicating at least a color to be displayed on the display unit is provided for each pixel, and the display information includes a road figure indicating a road corresponding to the drivable route searched by the search unit and a natural object figure indicating a natural object. corresponds to an extended road figure obtained by extending the road figure to a predetermined range in the width direction while maintaining the display information corresponding to the natural figure based on the position of the natural figure from the first map data represented based on changing the display information to generate second map data representing a boundary of a travelable area in which the mobile body is predicted to be able to continue traveling with the remaining amount of the fuel or the battery, starting from the current location; a map data generation unit;
a display control unit that causes the display unit to display the map image representing the drivable area, the drivable route in the drivable area, and the natural object based on the second map data. map display device. The natural object is the sea and a land water part including at least a river,
2. The map data generation unit changes the display information corresponding to the extended road figure to second display information indicating a second color different from the color indicated by the first map data. The map display device described in . The map data generation unit temporarily changes the display information corresponding to the outside of the first extended road figure, which is the extended road figure, to third display information indicating a third color in the first map data. a second extended road figure obtained by changing said display information, which is not said third display information and does not correspond to said natural object figure, to said second display information, and said road figure is expanded within a range not overlapping said said natural object figure; 3. The map display device according to claim 2, wherein the map display device generates . The map data generating unit generates a first extended road figure, which is the extended road figure, and converts the display information corresponding to a third extended road figure obtained by excluding the natural object figure from the first extended road figure to the second extended road figure. 3. The map display device according to claim 2, wherein the display information is changed. The map data generation unit temporarily changes the resolution of the first map data to 4. The map display device according to claim 3, wherein the map display device is lowered. The map data generation unit draws two or more polygonal graphics along the outer periphery of the road graphic to generate the first extended road graphic composed of the road graphic and the polygonal graphic. ,
6. The polygonal figure is characterized in that the length in the width direction of the road figure is a length corresponding to a predetermined distance when displayed on the display unit. The map display device according to any one of items 1 and 2. The display information includes transparency information indicating color transparency,
7. The map display device according to any one of claims 2 to 6, wherein the transparency information included in the second display information has a transparency of 40% or more and 80% or less. A map display system comprising: a display device configured with two or more pixels for displaying a map image showing a map; and a server communicating with the display device,
The server is
Based on current location information indicating the current location of the moving object and information indicating the remaining amount of fuel or battery that is an energy source for running the moving object, the mobile object radiates from the current location and spreads from the current location as a starting point. a searching unit that searches for a travelable route that is predicted to allow the mobile body to continue traveling with the remaining amount of the fuel or the battery;
Display information indicating at least a color to be displayed on the display device is provided for each of the pixels, and the display information includes a road figure indicating a road corresponding to the travelable route searched by the search unit and a natural object figure indicating a natural object. corresponds to an extended road figure obtained by extending the road figure to a predetermined range in the width direction while maintaining the display information corresponding to the natural figure based on the position of the natural figure from the first map data represented based on changing the display information to generate second map data representing a boundary of a travelable area in which the mobile body is predicted to be able to continue traveling with the remaining amount of the fuel or the battery, starting from the current location; a map data generation unit;
The map display system, wherein the display device displays the map image representing the drivable area, the drivable route within the drivable area, and the natural object based on the second map data. a computer comprising a display unit configured with two or more pixels and displaying a map image showing a map;
Based on current location information indicating the current location of the moving object and information indicating the remaining amount of fuel or battery that is an energy source for running the moving object, the mobile object radiates from the current location and spreads from the current location as a starting point. a searching unit that searches for a travelable route that is predicted to allow the mobile body to continue traveling with the remaining amount of the fuel or the battery;
Display information indicating at least a color to be displayed on the display unit is provided for each pixel, and the display information includes a road figure indicating a road corresponding to the drivable route searched by the search unit and a natural object figure indicating a natural object. corresponds to an extended road figure obtained by extending the road figure to a predetermined range in the width direction while maintaining the display information corresponding to the natural figure based on the position of the natural figure from the first map data represented based on changing the display information to generate second map data representing a boundary of a travelable area in which the mobile body is predicted to be able to continue traveling with the remaining amount of the fuel or the battery, starting from the current location; a map data generation unit;
The map image representing the travelable area, the travelable route within the travelable area, and the natural object is displayed on the display unit based on the second map data. program to do. a communication unit configured with two or more pixels and connected to a display device for displaying a map image showing a map;
Based on current location information indicating the current location of the moving object and information indicating the remaining amount of fuel or battery that is an energy source for running the moving object, the mobile object radiates from the current location and spreads from the current location as a starting point. a searching unit that searches for a travelable route that is predicted to allow the mobile body to continue traveling with the remaining amount of the fuel or the battery;
Display information indicating at least a color to be displayed on the display device is provided for each of the pixels, and the display information includes a road figure indicating a road corresponding to the travelable route searched by the search unit and a natural object figure indicating a natural object. corresponds to an extended road figure obtained by extending the road figure to a predetermined range in the width direction while maintaining the display information corresponding to the natural figure based on the position of the natural figure from the first map data represented based on changing the display information to generate second map data representing a boundary of a travelable area in which the mobile body is predicted to be able to continue traveling with the remaining amount of the fuel or the battery, starting from the current location; a map data generation unit;
a communication control unit that transmits the second map data representing the travelable area, the travelable route in the travelable area, and the natural object to the display device via the communication unit; map data generation device.

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