JP6570470B2 - Electronic device, map display system, and map display method - Google Patents

Description

  The present invention relates to a display method for displaying a polygon representing a specific area such as a facility or traffic information on a map.

  The navigation device can display map data on a display and perform route guidance to a destination. In the map data, node data indicating location data such as intersections and link information indicating sections such as roads are stored, and information indicating areas of relatively large facilities (airports, parks, factories, etc.) Is stored as polygon information. The polygon information defines the area by indicating the facility area as a polygon, and has data such as vertex coordinates of the polygon. The map data includes icon information indicating the type and content of polygon information, and the position for displaying the icon information is determined in advance, for example, at the center of the polygon.

  When the polygon information represents a relatively large area, it is necessary to consider where the icon information is displayed in the polygon information, and various techniques have been disclosed regarding the icon information display method. Patent Document 1 discloses a navigation device that prepares road map data storing polygon names at a plurality of positions in a polygon in advance and displays the polygon names at any of the plurality of positions when displaying the polygons. . Patent Document 2 discloses a map display device and a map display system that can automatically update polygon information regardless of a human operation, for updating polygon information. Patent Document 3 discloses a vehicle navigation device that displays a polygon name for a polygon when the display area is greater than or equal to a predetermined value based on the display area of the polygon. Patent Document 4 discloses a navigation device that displays a POI icon at the center of a polygon.

JP-A-9-330024 JP, 2014-106077, A Japanese Patent No. 3428294 Japanese Patent No. 4183426

  The map display method in the conventional in-vehicle device has the following problems. Conventional polygon information has often been stored in advance in in-vehicle devices, but nowadays, as represented by VICS (registered trademark), in addition to facilities, traffic congestion and accidents that occur in real time Polygon information is being provided as road traffic information representing areas such as traffic regulation, and weather information representing areas of weather conditions such as rain and snow. Such polygon information can be changed in size and shape at any time, and the icon information indicating the type of polygon information cannot be uniquely determined, that is, the display position of the icon information is determined. There may not be. In such a case, when displaying icon information related to polygon information on the in-vehicle device side, for example, as disclosed in Patent Document 4, a method of displaying icon information on the center coordinates and center-of-gravity coordinates of a polygon is conceivable. However, depending on the relationship between the screen display range and the polygon size, icon information may not be displayed properly on the display screen.

  FIG. 19 is a diagram showing the relationship between road map data, polygons, and a screen display range. It is assumed that a polygon (shaded area) 1 representing a rain area and an icon 2 representing rain at the center of the polygon 1 are drawn on road map data of a certain scale. When the own vehicle M travels along the road 2, if the polygon 1 is larger than the screen display range 3 of the in-vehicle device, a part of the polygon 1 is displayed on the display screen, but the icon 2 is not displayed. The user cannot recognize what the polygon 1 should represent. In addition, in order to check the icon 2, it is necessary to scroll the screen to search for the icon 2 or change the map scale. After checking the icon, it is necessary to return the screen to the original state. Such an operation is very troublesome for the user.

  The present invention solves such a conventional problem, and an object thereof is to provide an electronic device, a map display system, and a map display method capable of easily recognizing icon information related to polygon information. .

  An electronic apparatus having a map display function according to the present invention generates a polygon figure based on storage means for storing map data, acquisition means for acquiring polygon information for representing a specific area, and the polygon information. Generating means, dividing means for virtually dividing the map data into a plurality of areas, and display of at least one icon related to the polygon information in the divided at least one area overlapping the polygon figure Determining means for determining a position; and display means for displaying the polygon figure and the icon on the map data according to the display position.

  Preferably, the dividing unit virtually divides the map data into a plurality of rectangular regions. Preferably, the dividing means virtually divides the mesh into a plurality of rectangular regions when the map data is composed of a plurality of meshes. Preferably, the dividing unit changes a size of dividing into rectangular regions according to the scale of the map data. Preferably, the dividing unit virtually divides the map data so that the latitude direction and the longitude direction are equally spaced. Preferably, when the scale of the displayed map data is changed, the determination unit changes the display position of the icon according to the change of the scale. Preferably, the determining means determines at least one vertex of the rectangular area as a display position of the icon. Preferably, the determining means determines each vertex of the rectangular area as a display position of the icon.

  Preferably, when the icon is displayed at the display position determined by the determination unit, the determination unit includes a determination unit that determines whether or not the icon protrudes from the polygon figure, and the determination unit determines that the icon protrudes In the case of being performed, the display position is not determined as the display position. Preferably, when the icon is displayed at the display position determined by the determining unit, the display unit includes a determining unit that determines whether or not the icon protrudes from the polygon figure, and the display unit determines that the icon protrudes If so, the map scale is enlarged so that the icon does not protrude. Preferably, when the icon is displayed at the display position determined by the determining unit, the display unit includes a determining unit that determines whether or not the icon protrudes from the polygon figure, and the display unit determines that the icon protrudes If so, the size of the icon is reduced so that the icon does not protrude. Preferably, when the icon is displayed at the display position determined by the determining unit, the display unit includes a determining unit that determines whether or not the icon protrudes from the polygon figure, and the display unit determines that the icon protrudes If it has been selected, the icon is not displayed. Preferably, the acquisition unit acquires the polygon information by communication or broadcast, and the polygon information does not include display position information of the icon. Preferably, the polygon information is polygon information representing an area related to weather information or an area related to traffic information.

The map display system according to the present invention includes an electronic device and a distribution center that distributes polygon information including at least the type of weather or traffic condition and its area, and the distribution center communicates with the electronic device. Communication means, and transmission means for transmitting the polygon information via the communication means, wherein the electronic device stores storage means for storing map data, receiving means for receiving the polygon information, Based on polygon information, generating means for generating a polygon figure, dividing means for virtually dividing the map data into a plurality of areas, and at least one in at least one divided area overlapping with the polygon figure Determining means for determining a display position of an icon related to the polygon information, and in accordance with the display position, the polygon figure and the previous A display means for displaying an icon on the map data.

  The map display method according to the present invention is in an electronic apparatus provided with a map display function and storage means for storing map data, the acquisition step for acquiring polygon information for representing a specific area, and the polygon information A generating step for generating a polygon figure, a dividing step for virtually dividing the map data into a plurality of areas, and at least one of the divided at least one area overlapping the polygon figure. A determination step of determining a display position of an icon related to polygon information; and a display step of displaying the polygon figure and the icon on the map data according to the display position.

  According to the present invention, when displaying polygon information, the display position of the icon information related to the polygon information is calculated, and the icon information is displayed at the calculated display position. Therefore, the polygon larger than the display screen is displayed. Even when information is displayed, the icon information can be easily viewed. In addition, it is possible to automatically arrange icon information at an appropriate position and display it in comparison with polygon information whose icon information display position is not determined or polygon information whose icon information display position is fixed. it can.

It is a block diagram which shows the structure of the vehicle-mounted apparatus by the Example of this invention. It is a figure which shows the example of a display of the road map by the navigation part of a present Example. It is a figure which shows the example which acquires information from the other delivery site by a present Example. It is a figure which shows a mode that the road traffic information and weather information including polygon information are provided from a roadside machine. It is a figure explaining the structure of the delivery center which delivers road traffic information and weather information. It is a figure explaining the polygon information delivered from a delivery center. FIG. 7A shows the relationship between map data and polygon information, and FIG. 7B is a display example when polygon information is included in the displayable area of map data. It is a figure which shows the structural example of map data. It is a figure which shows the structural example of icon information. It is a figure which shows the functional structure of the map display control program which concerns on 1st Example of this invention. It is a figure which shows the functional structure of the icon display position calculation part shown in FIG. It is a figure which shows the specific example of a calculation of the icon display position calculation part by 1st Example of this invention. It is a flow which shows operation | movement of the map display control which concerns on 1st Example of this invention. It is a flow which shows operation | movement of the icon display position calculation part which concerns on 1st Example of this invention. It is a map display example by the map display control which concerns on 1st Example of this invention. It is a figure which shows the example which icon information protrudes from the outline of polygon information. It is a figure which shows the functional structure of the map display control program which concerns on 2nd Example of this invention. It is a flow which shows the operation | movement of icon display position determination which concerns on 2nd Example of this invention. It is a figure which shows the example of a display of the polygon in the conventional vehicle-mounted apparatus.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. An electronic device according to an embodiment of the present invention includes an in-vehicle device such as a navigation device fixedly mounted on a moving body such as an automobile, a portable computer device that can be brought into the moving body, and a tablet computer device. Can be. The electronic device of the present invention has a map display function, and can display road traffic information, weather information, event information, and the like on the map for the driver's drive assist. Road traffic information, weather information, event information, and the like can be preferably obtained from an external distribution center, a roadside device installed on the road, broadcast, or the like. Furthermore, such information may be acquired by inter-vehicle communication. The electronic apparatus may further include other functions such as a function of reproducing audio / video data, a function of receiving television / radio broadcasts, and a function of executing application software. Furthermore, the electronic device of the present invention may itself store road map data for executing a navigation function in a storage device, or may be a distribution site on the Internet or via a data communication means such as wireless communication. The necessary road map data may be acquired from a distribution server or the like.

  FIG. 1 is a block diagram showing the configuration of the in-vehicle device of this embodiment. As an example, the in-vehicle device 10 includes an input unit 100, a position information calculation unit 110, a navigation unit 120, a display unit 130, an audio output unit 140, a communication unit 150, a storage unit 160, and a control unit 170.

  The input unit 100 receives an instruction from the user through an input key device, a voice input recognition device, a touch panel, and the like, and provides this to the control unit 170. The position information calculation unit 110 calculates the current location of the host vehicle based on a GPS signal transmitted from a GPS satellite, an output from a relative direction sensor such as a gyro sensor, and an absolute direction sensor such as a geomagnetic sensor.

  For example, the navigation unit 120 calculates a guide route from the current location to the destination calculated by the position information calculation unit 110, and outputs a voice guidance of the calculated guide route from the voice output unit 140, The road map is displayed on the display unit 130. The destination used for the navigation unit 120 is input from the input unit 100 by a user operation, for example.

  When the navigation unit 120 displays a road map on the display unit 130, the navigation unit 120 superimposes and displays the current location of the vehicle calculated by the position information calculation unit 110 on the map. FIG. 2 is a diagram illustrating a display example of a road map by the navigation unit 120. FIG. 2A is a plan view of map data stored in the storage unit 160, which will be described later, and M represents the vehicle. X is a display range by the display unit 130 of the in-vehicle device 10. As shown in FIG. 2B, the map data of the display range X is displayed on the display unit 130. The map display by the navigation unit 120 can change the displayed area by changing the scale of the map data.

  The display unit 130 includes a display device such as a liquid crystal display or an organic EL. For example, the display unit 130 displays a road map image generated by the navigation unit 120 (see FIG. 2) or a setting screen or menu for performing user settings. Display the screen. The voice output unit 140 outputs voice guidance for guiding the route calculated by the navigation unit 120, or performs voice guidance of driving support information to the driver.

  The communication unit 150 enables data transmission / reception with various external devices. For example, as shown in FIG. 3, the communication unit 150 accesses the position information distribution site 152 via the network NW, acquires the vehicle position information from there, or accesses the map data distribution site 154, Necessary map data can be acquired from, or the road traffic information distribution site 156 can be accessed from which detailed information regarding road traffic information can be acquired. Furthermore, although not shown here, it is possible to access a site that distributes weather information and event information and acquire weather information and event information therefrom. The vehicle position information obtained from the position information distribution site 152 can be used in place of the vehicle position information calculated by the position information calculation unit 110. Further, by using the map data distribution site 154, the in-vehicle device 10 may store the minimum necessary map data in the storage unit 160.

  Further, the communication unit 150 can perform wireless communication with a roadside device such as a beacon installed on the road, other facilities, and the like, and can acquire information distributed by VICS (registered trademark) or the like. FIG. 4 shows a state in which the in-vehicle device 10 receives information distributed by the roadside device H as one example. When the own vehicle M equipped with the in-vehicle device 10 travels in the vicinity of the roadside device H, the communication unit 150 receives information from the roadside device H. The information includes road traffic information such as traffic jams, accidents, traffic regulations, weather information such as rain, strong winds, thunderstorms, snowfalls, tornadoes, and event information held in a wide area. Polygon information can be included as position information for specifying the. When the in-vehicle device 10 receives the polygon information, the in-vehicle device 10 displays the polygon information and related icon information on the map to alert the driver.

  FIG. 5 is a diagram illustrating the configuration and functions of a distribution center that distributes road traffic information and weather information. The distribution center 180 includes a control unit 182 that controls each unit, a communication unit 184 that enables communication with the in-vehicle device 10, and a storage unit 186 that stores road traffic information, weather information, event information, and the like.

  Control unit 182 includes an information transmission unit 182A and an information update unit 182B. The information transmission unit 182A transmits road traffic information, weather information, events, and the like including the polygon information stored in the storage unit 186 to the in-vehicle device 10 via the communication unit 184. The information update unit 182B updates information including polygon information held in the storage unit 186 to the latest information.

  FIG. 6 is a diagram for explaining polygon information included in road traffic information and weather information. Polygon information is surface information (two-dimensional information) including information on type information, center point, radius, major axis, minor axis, vertex 1, vertex 2... Vertex n. The type information is information indicating the type of polygon information. In FIG. 6, “rain” and “thunderstorm” are shown as an example of weather information, “meeting” is shown as an example of event information, and road traffic information As an example, “prohibition of entry” is shown. In addition, although a specific name is described here for easy understanding, the type information is generally represented by a code value. The polygon information has an arbitrary shape. For example, if the polygon is a circle or an ellipse, the shape and size of the polygon are represented by the center point, radius, major axis, minor axis, and the like. If the polygon is a polygon, it is represented by the coordinates (latitude, longitude) of a plurality of vertices 1, vertex 2... Vertex n (n is a natural number of 3 or more). Although not shown here, the polygon information can include polygon color information. Polygons are usually translucent because they are drawn in a superimposed manner on a map. Further, the polygon information can include icon information related to the polygon information. For example, in the case of rain polygon information, icon information representing rain is included together. In this case, when polygon information is displayed, the icon information included together is displayed.

  FIG. 7A shows the relationship between polygon information and map data. The polygon information is drawn so as to be superimposed on the map data based on the position information. In the figure, Poly1 is a polygon of “rain” shown in FIG. 6, Poly2 is a polygon of “thunderstorm”, and Poly3 is a polygon of a meeting. X is a displayable area of the display unit 130. When the polygon Poly2 is included in the displayable area X as shown in FIG. 7B, the polygon Poly2 is displayed on the map.

  The storage unit 160 can store application software and programs executed by the control unit 170, map data required by the navigation unit 120, and the like. The map data can include information necessary for the operation of the navigation unit, such as node data indicating intersections, link data indicating roads between nodes, and the like. The map data is managed in units of meshes (foliage) separated into rectangles at regular latitude and longitude intervals, and one mesh can be composed of a plurality of layers. For example, as shown in FIG. 8, the map data 190 is separated into a coarse mesh composed of Map 1, Map 2, Map 3, and Map 4, and each coarse mesh is further separated into four fine meshes. For example, when a map around the vehicle position is displayed by the navigation unit 120, a mesh corresponding to the vehicle position is read from the storage unit 160 and the map is displayed on the display unit 130. By managing the map data in units of meshes, the size of the map data read from the storage unit 160 can be reduced, the amount of map data processed by the display unit 130 can be reduced, and the map can be drawn at high speed. The map data is prepared for each of a plurality of scales, and when the scale of the map displayed by the display unit 130 is changed, the corresponding map data is read from the storage unit 160.

  The storage unit 160 can store icon information necessary for displaying polygon information. FIG. 9 is a diagram for explaining icon information. The icon information can include type information corresponding to the type information of polygon information shown in FIG. 6, an icon shape, and an icon color. The icon shape includes an icon frame and an image included therein. The size of the icon shape is defined by the number of vertical x horizontal pixels. The icon color specifies the default color of the icon shape. However, since the icon color is drawn superimposed on the polygon information, it can be changed so as not to be the same color as the polygon information.

  In a preferred embodiment, the control unit 170 includes a microcontroller including a ROM, a RAM, and the like, and the ROM or the RAM can store various programs for controlling the operation of each unit of the in-vehicle device 10. In the present embodiment, the control unit 170 includes a map display control program 200 that displays polygon information acquired from the outside or stored in the storage unit 160 on map data.

  FIG. 10 is a diagram illustrating a functional configuration example of the map display control program of the present embodiment. The map display control program 200 includes a polygon information acquisition unit 210, a polygon graphic generation unit 215, an icon information acquisition unit 220, an icon display position calculation unit 230, and an icon display unit 240.

  The polygon information acquisition unit 210 acquires polygon information distributed from the distribution center 180, for example. The polygon information is not limited to the distribution center 180, and may be acquired from, for example, FM multiplex broadcasting, a roadside device, or the like, or may be acquired polygon information held in the storage unit 160. . The polygon graphic generation unit 215 generates a polygon graphic representing a two-dimensional area based on the polygon information acquired by the polygon information acquisition unit 210. The generated polygon figures are, for example, polygon figures Poly1, Poly2, and Poly3 as shown in FIG.

  When polygon information is acquired by the polygon information acquisition unit 210, the icon information acquisition unit 220 acquires icon information corresponding to the acquired polygon information if the polygon information does not include the icon information. For example, the corresponding icon information is acquired from the storage unit 160 based on the type information included in the polygon information. In addition, when icon information is provided from a roadside machine capable of bidirectional communication, the icon information may be acquired from the roadside machine.

  The icon display position calculation unit 230 calculates the display position of the icon acquired by the icon information acquisition unit 220. When polygon information representing real-time information is acquired, it is often not specified at which position of the polygon information the icon information is displayed. Even if the position where the icon information is displayed in the polygon information is specified, if the size of the polygon information exceeds the displayable area X by the display unit 130, the icon information is displayed at the specified position. That is not always appropriate. Therefore, the icon display position calculation unit 230 according to the present embodiment preferably calculates the icon display position when polygon information whose icon information display position is not specified is acquired. Even if the display position of the icon information is specified in the information, the display position of the icon may be calculated.

  FIG. 11 is a block diagram illustrating a detailed configuration of the icon display position calculation unit 230. The icon display position calculation unit 230 includes a mesh selection unit 232, a map data division unit 234, and a display position determination unit 236.

  The mesh selection unit 232 selects a mesh of map data that is a target of the map data division unit 234 described later. In other words, a mesh of map data that may display polygon information or icon information is selected. FIG. 12 is a diagram illustrating a specific calculation method of the icon display position calculation unit. In the figure, four meshes M1, M2, M3, and M4 are shown, and the four meshes M1 to M4 are separated by a mesh frame 300 that passes through vertices P1 to P9. The mesh selection unit 232 selects four meshes M1 to M4 having an overlapping positional relationship based on the position coordinates of the polygon information 310 to be displayed. When a plurality of map data are prepared for each scale, a mesh is selected in the map data of the scale corresponding to the scale of the map display by the display unit 130.

  The map data division unit 234 virtually divides the mesh selected by the mesh selection unit 232. Preferably, the map data dividing unit 234 divides one mesh into a plurality of rectangular regions. In the example of FIG. 12, the lower left vertex of the selected lower left mesh M1 is used as a reference point, and the horizontal horizontal lines (Q1 to Q6) and the vertical vertical lines (R1 to R4) are equally spaced. A rectangular region defined by the points where the lines are drawn in a lattice pattern and these lines intersect is obtained. In the illustrated example, one mesh is virtually divided into nine rectangular regions. This one rectangular area provides a display position for displaying icon information.

  The grid interval by the horizontal line and the vertical line is determined according to the scale of the map data. For example, as the scale of the map data becomes larger (as the display area by the displayable range X becomes smaller), the lattice spacing becomes relatively large. As the map scale becomes smaller (as the display area of the displayable region X becomes larger), it becomes relatively smaller. Preferably, when the display unit 130 displays polygon information, the lattice interval is determined so that at least one icon information is easily displayed in the displayable region X. On the other hand, if the grid interval is too narrow, more icon information is displayed than necessary, and as an example, the grid interval is set so that the number of icon information displayed in the displayable area X is two or less. You may make it do.

  The display position determining unit 236 determines the display position of icon information when displaying polygon information based on the rectangular area divided by the map data dividing unit 234. In one preferable example, the display position determination unit 236 determines at least one display position in one rectangular area in an area overlapping with the polygon graphic generated by the polygon graphic generation unit 215. In the following description, the polygon information may be used as a generic name including polygon figures. The display position is determined, for example, by determining the center point, the center of gravity, or any one of the four vertices of the rectangular area as the display position. As another example, each vertex of one rectangular area may be determined as the display position, or each vertex and the center point of the rectangular area may be determined as the display position.

  The icon display unit 240 displays icon information at the display position calculated by the icon display position calculation unit 230 when the polygon information is displayed on the map. FIG. 12 is a display example when each vertex of the rectangular area is determined as the display position. That is, each vertex of the rectangular area overlapping the polygon 310 is determined as the display position, and the icon information 320 is displayed there. Although the displayable area X by the display unit 130 is not shown in FIG. 12, it is desirable that at least one icon information 320 is displayed when the polygon information 310 is displayed by the displayable area X.

  FIG. 13 is a flowchart showing the map display operation of the in-vehicle device of this embodiment, and FIG. 14 is a flowchart showing the operation of determining the display position. First, when polygon information is acquired by the polygon information acquisition unit 210 (S100), the polygon graphic generation unit 215 generates a polygon graphic based on the acquired polygon information (S101), and the icon information acquisition unit 220 acquires the polygon information. Icon information corresponding to the polygon information thus obtained is acquired (S102). Next, the icon display position calculation unit 230 calculates a display position for displaying the acquired icon information in the acquired polygon information (S104).

  The mesh selection unit 232 refers to the map scale displayed by the display unit 130, and selects a mesh having a positional relationship overlapping with the position information (for example, the coordinates of each vertex) of the acquired polygon information (S1040). . Next, the map data dividing unit 234 determines a reference position from the selected mesh (S1042). The reference position is, for example, one of the vertices constituting the selected mesh frame. Next, the map data dividing unit 234 determines a lattice interval for virtually dividing the mesh into a plurality of rectangular regions (S1044). As described above, the grid interval is determined according to the map scale displayed by the display unit 130. A table in which the relationship between the map scale and the grid interval is defined in advance is prepared and referred to. It is desirable. When the lattice interval is determined, the map data dividing unit 234 virtually draws lattice lines at equal intervals from the reference position, and divides the selected mesh into rectangular regions (S1046). Next, the display position determination unit 236 determines the display position of the icon information based on the divided rectangular area (S1048). As described above, at least one display position is determined in the rectangular area including the vertex, and the determined display position is held in a register or the like.

  Next, the icon display part 240 displays icon information so that it may overlap with polygon information according to the display position of the calculated icon information (S106). FIG. 15 is a display example of polygon information and icon information of the present embodiment. When the host vehicle M travels along the road 2, the map data displayed in the displayable area X relatively moves with the movement of the host vehicle. When the polygon information 310 is displayed in the displayable area X, at least one icon information 320 is displayed in the displayable area X by optimizing the display position of the icon information. The polygon graphic generated by the polygon graphic generation unit 215 is drawn so as to be superimposed on the road map by the display unit 130, and the icon display unit 240 displays icon information on the display unit 130 so as to be superimposed on the polygon graphic. Let it draw. Further, the generation of the polygon graphic by the polygon graphic generation unit 215 is not necessarily performed at the timing of S101, and may be generated when the display position is determined by the display position determination unit 236.

  When the map scale of the display unit 130 is changed by user input (S108), the icon display position calculation unit 230 calculates the icon display position according to the map scale again (S104), and the icon. The display unit 240 displays icon information at the recalculated display position. The processing from step S100 to S108 ends when the display of the map ends or when there is no polygon information to be displayed (S110).

  As described above, according to the present embodiment, when polygon information is displayed on a map, a display position for displaying icon information related to the polygon information is calculated, and the icon information is displayed at the calculated display position. As a result, when polygon information is displayed, the icon information can be automatically arranged at a position where it can be easily seen. In particular, it is beneficial to apply the method of this embodiment when the shape or the like of the polygon information is sequentially changed or the icon display position is not set in the polygon information. Even when the area represented by the polygon information is large, at least one icon information is displayed in the displayable area, so that the user can easily recognize the contents of the polygon information and can drive safely. it can.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the icon information is displayed at the grid point where the horizontal line and the vertical line intersect. However, as shown in FIG. 16, the icon information 320 rather than the outline of the polygon information 310 (or polygon figure). The outline of may protrude outside. If the icon information 320 extends beyond the polygon information 310 more than necessary, the map information is hidden by the icon information 320, which is not preferable. Therefore, in the second embodiment, when some of the icon information exceeds the contour of the polygon information, several display controls are performed.

  FIG. 17 is a block diagram showing a functional configuration of the map display control program 200A of the second embodiment. In the second example, the map display control program 200A includes a departure determination unit 250 in addition to the case of the first example. If the icon display unit 240 displays the icon information at the display position determined by the display position determination unit 236 of the icon display position calculation unit 230, the departure determination unit 250 determines that the icon information is polygon information (or polygon figure). It is determined whether or not to protrude from the outline. As shown in FIG. 9, the shape or size of the icon information is known, and the coordinate position of each vertex of the icon information (for example, when the icon is rectangular) when the icon information is displayed is easy. Can be sought. When the coordinates of each vertex of the icon information protrude from the outline of the polygon information, the departure determination unit 250 feeds back the determination result to the icon display position calculation unit 230, and the display position determination unit 236 is determined. Change the display position to the non-display position.

  FIG. 18 shows a flow of a method for determining the display position of icon information according to the second embodiment. As in the first embodiment, the display position determination unit 236 of the icon display position calculation unit 230 determines the display position of the icon information (S200), and then the deviation determination unit 250 sets the determined display position to the determined display position. When the icon information is displayed, it is determined whether or not the icon information deviates from the outline of the polygon information (S202). If the icon information deviates (S204), the display position determination unit 236 determines the determined display position as non-display. The display position is changed (S206). Thereby, the icon information is not displayed at a position that deviates from the polygon information.

  Next, a modification of the second embodiment will be described. In the first modification, when it is determined that the icon information deviates from the outline of the polygon information, the size of the icon information is reduced instead of changing the determined display position to the non-display position. That is, when it is determined to deviate, the determination result is provided to the icon display unit 240, and the icon display unit 240 reduces the size of the specified icon (for example, thins out the number of pixels) and displays icon information. Furthermore, even if the icon information does not protrude from the outline of the polygon information, or even if it protrudes, the extent of the protrusion is reduced.

  In the second modification, when it is determined that the icon information deviates from the outline of the polygon information, the icon display unit 240 that receives the determination result hides the icon information at the determined display position. Further, in the third modification, when it is determined that the icon information deviates from the outline of the polygon information, the map scale is enlarged. That is, by expanding the map scale, the display area of the polygon information is also expanded. Therefore, even if the icon information does not protrude from the polygon information, the degree can be reduced.

  The preferred embodiment of the present invention has been described in detail above. However, the present invention is not limited to the specific embodiment, and various modifications and variations are possible within the scope of the gist of the invention described in the claims. It can be changed.

10: In-vehicle device 100: Input unit 110: Location information calculation unit 120: Navigation unit 130: Display unit 140: Audio output unit 150: Communication unit 152: Location information distribution site 154: Map data distribution site 156: Road traffic information distribution site 160: Storage unit 170: Control unit 200: Map display control program 210: Polygon information acquisition unit 215: Polygon figure generation unit 220: Icon information acquisition unit 230: Icon display position calculation unit 232: Mesh selection unit 234: Map data division unit 236: Display position determination unit 240: Icon display unit 250: Deviation determination unit M: Own vehicle NW: Network X: Displayable area

Claims (14)

An electronic device having a map display function,
Storage means for storing map data;
Display means capable of displaying the map data read from the storage means;
Acquisition means for acquiring polygon information including information on a position and a shape for representing a two-dimensional region ;
Generating means for generating a polygon figure based on the polygon information;
Selecting means for selecting map data having a positional relationship overlapping with the polygon information in map data corresponding to a scale of map data displayed by the display means when the polygon information is acquired;
Dividing means for virtually dividing the map data selected by the selecting means into a plurality of rectangular areas , wherein the dividing means displays an icon related to the polygon information in the rectangular area, Determining the grid interval for dividing the rectangular area so that at least one icon is displayed in the displayable area of the display means;
Determining means for determining a display position of at least one icon in at least one rectangular area ;
The display means, in accordance with the display position determined by said determining means, that displays the polygon graphics and the icons on the map data, the electronic device. When the map data is composed of a plurality of meshes, the selection unit selects a mesh having a positional relationship overlapping with the polygon information, and the dividing unit virtually divides the mesh into a plurality of rectangular regions. The electronic device according to claim 1 , wherein the electronic device is divided. Said dividing means, said dividing map data virtually as latitude direction and a longitude direction at equal intervals, the electronic device according to claim 1 or 2. When the scale of the map data to which the displayed has been changed, the determination unit changes the display position of the icon in accordance with the change of the scale, electronic apparatus according to 3 any one claims 1 . 5. The electronic device according to claim 1, wherein the determining unit determines at least one vertex of the rectangular area as a display position of the icon. The electronic device according to claim 1, wherein the determination unit determines each vertex of the rectangular area as a display position of the icon. And determining means for determining whether or not the icon protrudes from the polygon figure when the icon is displayed at the display position determined by the determining means, and the determining means is determined to protrude from the icon In the case, the electronic device according to any one of claims 1 to 6 , wherein the display position is not determined as the display position. Determining means for determining whether or not the icon protrudes from the polygon figure when the icon is displayed at the display position determined by the determining means;
The electronic device according to claim 1, wherein when it is determined that the icon protrudes, the display unit enlarges a map scale so that the icon does not protrude. Determining means for determining whether or not the icon protrudes from the polygon figure when the icon is displayed at the display position determined by the determining means;
The electronic device according to claim 1, wherein, when it is determined that the icon protrudes, the display unit reduces the size of the icon so that the icon does not protrude. Determining means for determining whether or not the icon protrudes from the polygon figure when the icon is displayed at the display position determined by the determining means;
The electronic device according to claim 1, wherein the display unit does not display the icon when it is determined that the icon protrudes. The electronic device according to claim 1, wherein the acquisition unit acquires the polygon information by communication or broadcasting, and the polygon information does not include display position information of the icon. The electronic device according to claim 1, wherein the polygon information is polygon information representing an area related to weather information or an area related to traffic information. A map display system comprising : the electronic device according to any one of claims 1 to 12; and a distribution center that distributes polygon information including at least a type of weather or traffic situation and an area thereof,
The distribution center
Communication means for communicating with the electronic device;
A map display system comprising: transmission means for transmitting the polygon information via the communication means . A map display method in an electronic device comprising display means capable of displaying map data and storage means for storing map data,
An acquisition step of acquiring polygon information including information about a position and a shape for representing a two-dimensional region ;
A generating step for generating a polygon figure based on the polygon information;
A selection step of selecting map data having a positional relationship overlapping with the polygon information in map data corresponding to a scale of map data displayed by the display means when the polygon information is acquired;
A dividing step of virtually dividing the selected map data into a plurality of rectangular areas , wherein the dividing step displays the icon associated with the polygon information in the rectangular area; Determining the grid interval for dividing the rectangular region so that at least one icon is displayed in the displayable region of
A determining step of determining a display position of at least one icon in at least one rectangular region;
A display step of displaying the polygon figure and the icon on the map data of the display means according to the display position;
A map display method comprising:

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