JP5795781B2 - Map display device and map display method - Google Patents

Description

The present invention relates to a map display device and a map display method for displaying weather information superimposed on a map.

2. Description of the Related Art A navigation device that displays wind direction information and wind speed information in an area around the vehicle position as a wind direction mark on a map is known as a conventional technique (for example, Patent Document 1).
JP 2006-292656 A

  In a map display device that displays weather information superimposed on a map like the navigation device described in Patent Document 1, it is desired to display weather information quickly.

The map display device according to the present invention is based on a current position detecting means for detecting a current position, a map data storing means for storing map data, a current position detected by the current position detecting means, and map data stored in the map data storing means. Map display means for displaying a map on a display monitor, and weather information receiving means for receiving weather information of a plurality of regions, wherein the map display means has a plurality of fixed positions on the display monitor on which the map is displayed. Each is characterized by displaying an icon indicating the weather information of the area including the geographical position corresponding to the fixed position.
In the map display method according to the present invention , weather information of a plurality of regions is received by a receiving device, a map is displayed on a display monitor, and a geographical position corresponding to each of a plurality of fixed positions on the display monitor is specified by a computer. Then, the computer extracts the weather information of the region including the specified geographical position from the weather information, and the computer displays icons corresponding to the extracted weather information at each of the plurality of fixed positions on the display monitor. It is characterized by that.

  According to the present invention, it is possible to speed up the process of displaying weather information superimposed on a map.

It is a block diagram which shows the structure of the navigation apparatus in embodiment of this invention. It is a figure for demonstrating the weather information of a satellite radio broadcast. It is a figure for demonstrating the map which displayed the wind data. It is a figure for demonstrating the latitude longitude of the position on the map corresponding to a fixed position and a fixed position. It is a flowchart for demonstrating the wind data display process in embodiment of this invention. It is a figure for demonstrating specification of the pixel in which the position on the map corresponding to a fixed position is contained. It is a figure for demonstrating the relationship between the reduced scale of a map, and the density of a pixel. It is a figure for demonstrating specification of the pixel in which the position on the map corresponding to a fixed position is contained when the position on the map corresponding to a fixed position exists on the boundary of a pixel. It is a figure for demonstrating display operation of the wind data of arbitrary positions.

  FIG. 1 shows a navigation device 1 according to an embodiment of the present invention. The navigation device 1 can receive weather information from satellite radio broadcasts, and can display the weather information on the display monitor 16 so as to overlap the map. Known satellite radio broadcasts include, for example, Sirius satellite radio. The navigation device 1 includes a control circuit 11, ROM 12, RAM 13, current location detection device 14, image memory 15, display monitor 16, speaker 17, input device 18, touch panel 19, touch panel control unit 110, satellite radio reception unit 111, reception memory 112. And a disk drive 113. The disk drive 113 is loaded with a DVD-ROM 114 in which map data is stored.

  The control circuit 11 includes a microprocessor and its peripheral circuits, and performs various controls by executing a control program stored in the ROM 12 using the RAM 13 as a work area. When the control circuit 11 performs a predetermined route search process based on the map data stored in the DVD-ROM 114, the processing result is displayed on the display monitor 16 as a recommended route.

  The current location detection device 14 is a device that detects the current location of the vehicle. The current location detection device 14 includes a vibration gyro 14a, a vehicle speed sensor 14b, a GPS (Global Positioning System) sensor 14c, and the like. The vibration gyro 14a detects the traveling direction of the vehicle. The vehicle speed sensor 14b detects the vehicle speed. The GPS sensor 14c detects a GPS signal from a GPS satellite. The navigation device 1 determines a map display range, a route search start point, and the like based on the current location of the vehicle detected by the current location detection device 14. In addition, the current location of the vehicle is displayed as a vehicle position mark on the map.

  The image memory 15 stores image data to be displayed on the display monitor 16. This image data includes road map drawing data and various graphic data. They are appropriately generated in the control circuit 11 based on the map data stored in the DVD-ROM 114. The navigation device 1 can perform map display and the like by using the image data generated in this way.

  The disk drive 113 reads map data from the DVD-ROM 114. The map data includes map display data, route search data, and the like. The map display data and the route search data include road link information and node information stored in the map data. The map display data has map data on a scale of seven levels from a wide area to details. Thereby, according to a user's request | requirement, the scale of a display map can be changed into seven steps. The map data may be read from a recording medium other than the DVD-ROM 114, such as a CD-ROM or a hard disk.

  The display monitor 16 provides the user with various information such as a map near the vehicle position as a screen display based on various information such as map data. The speaker 17 outputs sound for instructing the user to perform various input operations and for guiding the route. The input device 18 has operation keys for the user to set various commands, and is realized by a button switch on the operation panel, a hard switch around the panel, or the like. A user has operation keys for setting various commands, and is realized by a button switch on the operation panel or a hard switch around the panel. Further, by operating the input device 18, the scale ratio of the map displayed on the display monitor 16 can be changed. For example, the scale of a 1 / 50,000 map is 1 / 50,000. The user manually sets the destination by manually operating the input device 18 in accordance with an instruction on the display screen of the display monitor 16 or a voice instruction from the speaker 17. Further, by operating the input device 18, it is possible to select a satellite radio broadcast.

  When the destination is set by the user, the navigation device 1 uses the current location detected by the current location detection device 14 as a departure location, and performs a route calculation to the destination based on a predetermined algorithm. The route thus obtained (hereinafter referred to as a recommended route) is displayed on the screen in a manner different from other roads by changing the display form, for example, the display color. Thereby, the user can recognize the recommended route on the map on the screen. Further, the navigation device 1 instructs the user in the direction of travel using a screen or voice so that the vehicle can travel according to the recommended route, thereby guiding the route of the vehicle.

  The touch panel 19 is a transparent touch switch that is stacked on the surface of the display monitor 15. An image displayed on the display monitor 16 is displayed through the touch panel 19. Therefore, when the display screen of the display monitor 16 is pressed, the touch panel 19 is pressed. The touch panel 19 sends a signal corresponding to the operation position on the touch panel 19 to the touch panel control unit 110. The touch panel control unit 110 calculates the pressed position of the touch panel 19.

  When the various buttons or the display menu displayed on the display monitor 16 are pressed with a finger or the like, the touch panel 19 is pressed. Then, processing defined in various buttons and display menus is executed. Further, when the map displayed on the display monitor 16 is pressed, the touch panel 19 is pressed, and the map is scrolled so that the pressed position is displayed at the center of the display screen of the display monitor 16.

  The satellite radio receiver 111 receives a satellite radio broadcast broadcast from a satellite radio station (not shown) via an artificial satellite and outputs it to the control circuit 11. The received satellite radio broadcast is output from the speaker 17. The weather information of the satellite radio broadcast received by the satellite radio reception unit 111 is stored in the reception memory 112.

  The weather information of satellite radio broadcasting includes weather map information, information on storms such as typhoons and hurricanes, information on rainfall distribution by weather radar, and information on wind direction and wind power at each observation point. Information on the weather map includes, for example, information on the position (latitude / longitude) of high pressure or low pressure, position information on a warm front or cold front, information on isobaric lines, information on atmospheric pressure, and the like. The information on the storm includes information such as the position and direction of the typhoon, hurricane, tornado, kite, hail, thunderstorm, and predicted route. The information on the rainfall distribution includes a position where it is raining and information on the rainfall at that position.

  The weather information of the satellite radio broadcast is divided for each predetermined geographical area. For example, in the case of the United States of America, the land is divided as shown in FIG. 2A, and the weather information of the divided areas is gathered and becomes the weather information of the satellite radio broadcast. Hereinafter, this divided area is referred to as a tile. As shown in FIG. 2B, the tile 20 is further divided into a mesh shape, and the weather information corresponding to the tile 20 is further divided according to the area divided into the mesh shape. A further divided tile is called a pixel. In satellite radio broadcasting, weather information for all tiles is not transmitted all at once, but weather information for each tile is transmitted.

  The reception memory 112 is configured by a rewritable nonvolatile recording medium such as a flash memory or a hard disk. The reception memory 112 stores the weather information received by the satellite radio reception unit 111. The weather information stored in the reception memory 112 is displayed on the map as icons, isobars, cold fronts, and the like.

  Next, the wind data display processing in the embodiment of the present invention will be described with reference to FIG. FIG. 3 shows a display screen 16A of the display monitor 16 for explaining the map 30 displaying the wind data. Overlaid on the map 30, icons 31a to 31o representing the wind direction are displayed, and the wind speed is displayed under the icons 31a to 31o. In this embodiment, as shown in FIG. 4, icons 31a to 31o are placed at the center positions 51a to 51o of a 3 × 5 15-divided screen formed by dividing the display screen into three equal parts vertically and five equal parts horizontally. Is displayed. Hereinafter, the center position of each divided screen is referred to as a fixed position.

  The position and number of fixed positions are constant regardless of the scale of the map displayed on the display monitor 16. That is, even if the scale of the map displayed on the display monitor 16 is reduced, the number of fixed positions is not increased, and even if the scale of the map displayed on the display monitor 16 is increased, the number of fixed positions is reduced. Absent. The coordinates (Xa, Ya) to (Xo, Yo) in FIG. 4 are the latitudes and longitudes on the map corresponding to the fixed positions 51a to 51o.

  Next, wind data display processing in the embodiment of the present invention will be described with reference to the flowchart of FIG. The process of FIG. 5 is a program that starts when wind data display is selected from a menu (not shown), and is executed by the control circuit 11.

  In step S501, the latitude and longitude of the positions 61a to 61o (see FIG. 6) on the map corresponding to the fixed positions 51a to 51o at the center of the 15-divided screen of the display monitor 16 are calculated. In step S502, a tile including a position (latitude and longitude) on the map corresponding to the fixed position is specified based on the calculated latitude and longitude. In step S503, as shown in FIG. 6, pixels 62a to 62o including the calculated latitude and longitude are identified from among the plurality of pixels in the identified tile. In the example illustrated in FIGS. 3 to 6, description will be made assuming that all of the fixed positions 51 a to 51 o are included in one tile. Further, wind direction and wind speed data are stored in the reception memory 112 as wind data of each pixel.

  When specifying the pixel corresponding to the fixed position, the density of the reference pixel on the display screen differs depending on the scale of the map displayed on the display monitor 16. For example, when the scale of the map displayed on the display monitor 16 is large, that is, when a wide area map is displayed, the density of the pixels increases as shown in FIG. On the other hand, when the scale of the map displayed on the display monitor 16 is small, that is, when a detailed map is displayed, the pixel density is low as shown in FIG. Even if the density of the pixels changes, the number of pixels from which the wind data is extracted is fixed at 15. Therefore, even if the scale of the map displayed on the display monitor 16 changes, the wind data 31a to 31o are overlaid on the map 30. The time required for the display processing is almost the same.

  Depending on the map displayed on the display monitor 16, one of the fixed positions 61 a to 61 o on the map corresponding to the fixed positions 51 a to 51 o at the center of the divided screen may be on the pixel boundary. In this case, pixels including the positions 61a to 61o on the map corresponding to the fixed positions 51a to 51o are determined as follows. For example, as shown in FIG. 8A, when a position 61p on the map corresponding to the fixed position 51a corresponds to a contact point of four pixels, the pixel 62p on the lower right (southeast) is displayed on the map corresponding to the fixed position. Is determined as a pixel including the position of. Further, as shown in FIG. 8B, when the position 61q on the map corresponding to the fixed position 51a corresponds to the left / right (west-east) pixel boundary, the right (east) pixel 62q corresponds to the fixed position. It is determined as a pixel that contains a location on the map. Furthermore, as shown in FIG. 8C, when the position 61r on the map corresponding to the fixed position 51a corresponds to the upper / lower (north-south) pixel boundary, the lower (south) pixel 62r corresponds to the fixed position. Determine the pixel that contains the location on the map.

  In step S504, the weather information at the identified pixel is extracted from the weather information stored in the reception memory 112. In step S505, as shown in FIG. 6, wind data such as wind direction and wind speed is further extracted from the extracted weather information. In step S506, the wind data is superimposed on the map and displayed on the display monitor 16 as an icon or a numerical value of the wind speed. The icon is displayed at a fixed position.

The navigation device 1 according to the above-described embodiment of the present invention has the following operational effects.
(1) From the weather information received by the satellite radio reception unit 111, the weather information 31a to 31o of the area including the map area displayed on the display monitor 16 is extracted, and the extracted information 31a to 31o is displayed. Since the map 30 is displayed on the display monitor 16 and assigned to each area of the screen 16A, and the weather information 31a to 31o of the extracted area is assigned to each area of the display screen 16A and displayed, the weather information is displayed on the map. It is possible to speed up the process of displaying in a superimposed manner.

(2) Calculated from the control circuit 11 that calculates the geographical positions 61a to 61o corresponding to the center positions 51a to 51o of the respective areas on the map 30 being displayed, and the weather information received by the satellite radio receiver 111. And the control circuit 11 that extracts the weather information 31a to 31o in the regions 62a to 62o including the geographical positions 61a to 61o thus obtained, the weather information 31a to 31o to be assigned to each area of the display screen 16A can be quickly obtained. The weather information 31a to 31o can be accelerated and displayed on the map.

(3) The weather information is information for each of the divided regions 62a to 62o obtained by dividing the weather information providing region into a plurality of regions, and the control circuit 11 selects each of the display screens 16A from the plurality of divided regions 62a to 62o. Since the weather information 31a to 31o of the divided area including the geographical position of the region is extracted, the process of extracting the weather information 31a to 31o to be displayed on the map 30 can be accelerated.

(4) When the geographical positions 61p to 61r match the dividing lines of the divided areas 62p to 62r, the weather information included in any of the divided areas 62p to 62r divided by the dividing lines is Since it is assigned as the weather information of 61p to 61r, the weather information to be assigned to each area of the display screen 16A can be easily determined, and the process of displaying the weather information superimposed on the map can be accelerated.

(5) The weather information is distributed for each of the plurality of tiles 20 obtained by largely dividing the weather information providing area, and the tile 20 has weather information for each of the plurality of meshes 62a to 62o obtained by subdividing the area of the tile 20. did. Thereby, the weather information 31a-31o allocated to each area | region of the display screen 16A can be determined rapidly, and the process which displays the weather information 31a-31o on a map can be sped up.

(6) Since the control circuit 11 extracts the mesh weather information including the geographical position as the representative weather information as the weather information of the plurality of areas of the display screen 16A, each area of the display screen 16A Weather information 31a to 31o to be assigned to can be quickly determined, and the process of displaying the weather information 31a to 31o overlaid on the map can be accelerated.

(7) A plurality of fixed positions 51a to 51o are set on the display screen 16A, positions 61a to 61o on the map corresponding to the fixed positions 51a to 51o are calculated, and wind data is based on the positions 61a to 61o on the map. The pixels 62a to 62o to be extracted are specified, and the wind data 31a to 31o are extracted from the specified pixels 62a to 62o and displayed at the fixed positions 51a to 51o on the display screen. Accordingly, wind data (which pixel wind data is to be displayed) to be displayed overlaid on the map 30 in the received weather information can be quickly identified. Therefore, the wind data 31a to 31o are overlaid on the map 30. Display processing can be speeded up.

(8) The fixed positions 51a to 51o are not changed even when the scale of the map displayed on the display screen 16A is changed. Therefore, even if the scale of the map displayed on the display monitor 16 changes, it is possible to quickly specify the wind data to be displayed overlaid on the map 30 in the received weather information. It is possible to speed up the process of displaying the image on the screen.

(9) The display screen 16A is divided into 3 equal parts vertically and 5 equal parts horizontally to form 3 × 5 divided screens, and the fixed positions 51a to 51o are set as the center positions of the respective divided screens. Therefore, since the weather information in the range displayed on the display monitor 16 is not displayed in a biased manner, the weather information in the range displayed on the display monitor 16 can be easily grasped.

The above embodiment can be modified as follows.
(1) The weather information to be displayed overlaid on the map is not limited to the wind direction or wind speed. For example, it may be temperature, humidity, rainfall per unit time, integrated total rainfall, sunshine duration per unit time, atmospheric pressure, humidity, and the like. Also in these cases, the weather information to be displayed superimposed on the map can be quickly extracted from the received weather information, so that the process of displaying the weather information superimposed on the map can be accelerated.

(2) The division of the display screen for determining the fixed position is not limited to a divided screen in which the display screen is divided into three equal parts vertically and five equal parts horizontally, and is appropriately selected depending on the size and resolution of the display screen. be able to.

(3) The fixed position of the display screen is not limited to the embodiment as long as it is a plurality of predetermined positions on the display screen. However, when the map is scrolled so that the pressed position becomes the center of the display screen when the display screen of the display monitor 16 on which the map is displayed is pressed, one of the fixed positions is the display screen. It is preferable that it exists in the center position. Thereby, the user can display the wind data at the place on the display monitor 16 by pressing the position where the user wants to know the wind data. For example, as shown in FIG. 9A, when it is desired to know the wind data at the position 71 on the map 30, the position 71 is pressed. Then, as shown in FIG. 9B, the map is scrolled, and the pressed position 71 is displayed at the center of the display screen. Since the fixed position 51h is set at the center of the display screen, the wind data at the position 71 is displayed as shown in FIG. 9B.

  When the display screen is divided vertically into m and divided horizontally into n to form an m × n divided screen, and the fixed position is the center position of each divided screen, the values of m and n are odd numbers. In this case, one of the fixed positions is the center position of the display screen. Therefore, when the map is scrolled so that the pressed position becomes the center of the display screen when the display screen of the display monitor 16 on which the map is displayed is pressed, the values of m and n may be odd numbers. preferable. It may be an even number.

(4) The present invention is not limited to the navigation device 1 as long as it is a map display device. For example, a mobile phone with a map display function may be displayed as described above when displaying weather information.

  The above description is merely an example, and the present invention is not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 1 Navigation apparatus 11 Control circuit 14 Present location detection apparatus 15 Image memory 16 Display monitor 19 Touch panel 110 Touch panel control part 111 Satellite radio reception part

Claims (4)

Current location detection means for detecting the current location;
Map data storage means for storing map data;
Map display means for displaying a map on a display monitor based on the current position detected by the current position detection means and the map data stored by the map data storage means;
Weather information receiving means for receiving weather information of a plurality of regions,
The map display means displays, at each of a plurality of fixed positions on the display monitor on which the map is displayed, an icon indicating weather information of a region including a geographical position corresponding to the fixed position. Map display device. The map display device according to claim 1,
The map display device characterized in that the position and number of the fixed positions displayed on the display monitor are constant regardless of the scale ratio of the map displayed on the display monitor. Receiving weather information of multiple areas with the receiving device,
Display the map on the display monitor,
Identifying a geographical position corresponding to each of a plurality of fixed positions on the display monitor by a computer;
By the computer, the weather information of the area including the specified geographical location is extracted from the weather information,
A map display method , wherein the computer displays an icon corresponding to the extracted weather information at each of the plurality of fixed positions on the display monitor . The map display method according to claim 3,
The map display method, wherein the position and number of the fixed positions displayed on the display monitor are constant regardless of the scale ratio of the map displayed on the display monitor.

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