JP5294705B2 - Map data storage control device and map data storage control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a map data storage controller and a map data storage control method for enabling a user to select area of map data to be stored in a flash memory easily. <P>SOLUTION: Free space capacity of a map data storage part 240 is compared with capacity of map data in each area stored in a map data storage medium 200 to find area of map data having capacity being smaller than the free space capacity, generate an area display screen displaying the obtained area, and display it in a display 200. Consequently, when the user sees the screen displaying it, he/she can select any area from among the areas displayed on the screen optionally without wondering whether the map data of the area to be selected for storage can be stored in the map data storage part 240 or not to store the map data of the desired area in a storage device without fail. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a map data storage control device and a map data storage control method, and downloads and stores map data stored in a map data storage medium divided into areas for each area in a map data storage device of the apparatus. Regarding technology.

  In a conventional navigation device, a hard disk is used as a storage device for storing map data and the like. Recently, a navigation device using a nonvolatile flash memory instead of a hard disk has been proposed as a map data storage device. Since the flash memory is less expensive than the hard disk, it is possible to prevent an increase in the cost of the navigation device. Further, the flash memory has the merit of enabling faster access to map data, lower power consumption operation, and the like than a hard disk.

As a technique using a flash memory as a map data storage medium, for example, a technique described in Patent Document 1 exists. The technique described in Patent Document 1 is a vehicle-mounted navigation device equipped with a CD-ROM device. When the map CD-ROM is mounted on the CD-ROM device, the entire Japan is divided into a plurality of regions. When one of the areas is selected by the user, the map data corresponding to the area is read from the map CD-ROM and stored in the flash memory. When the vehicle starts traveling, map data around the vehicle position is read from the flash memory and displayed on the display device.
JP 09-62183 A

  By the way, in a technique using a flash memory as a storage medium for map data, the storage capacity of the flash memory is not as large as that of a hard disk, so that the amount of map data that can be stored is limited. Therefore, detailed map data necessary for navigation cannot be stored for all of Japan. That is, the user needs to select and store only the map data of a necessary area in the flash memory so as not to exceed the remaining capacity of the flash memory. However, there is a problem that it is difficult for the user to determine which area of map data can be stored with respect to the remaining capacity of the flash memory.

  The present invention has been made to solve such a problem, and an object of the present invention is to allow a user to easily select an area of map data to be stored in a flash memory.

  In order to solve the above-described problem, in the present invention, when the map data stored in the map data storage medium divided for each area is downloaded and stored in the map data storage unit of the apparatus for each area, Compare the free capacity of the data storage unit with the map data capacity of each area stored in the map data storage medium, find the area where the map data is less than the free capacity, and display the calculated area An area display screen is generated and displayed on the display device.

  According to the present invention configured as described above, an area of map data that can be stored in the map data storage unit in terms of capacity from among the map data that is divided and stored for each area in the map data storage medium. Is automatically displayed on the screen. Therefore, the user who sees the screen display appropriately selects one of the areas displayed on the screen without worrying about whether the map data of the area to be selected as the storage target can be stored in the storage device. Thus, the map data of the desired area can be reliably stored in the storage device. As described above, the user can easily select the area for storing the map data in the flash memory.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of a navigation system 120 including a map data storage control device 100 according to the first embodiment. The map data storage control device 100 stores the detailed map data (corresponding to the map data of the present invention) stored in the map data storage medium 140 divided into areas (in this embodiment, for each prefecture in Japan). Each area is downloaded and stored in the storage device of the apparatus. In the present embodiment, the map data storage medium 140 is a storage medium such as a CD-ROM or a DVD-ROM. As shown in FIG. 1, the navigation system 120 includes a vehicle position detection unit 160, an operation input unit 180, and a display 200 in addition to the map data storage control device 100.

  The own vehicle position detection unit 160 detects the current position of the vehicle. In the present embodiment, the vehicle position detection unit 160 includes a GPS receiver, information indicating the absolute longitude and latitude of the vehicle acquired by the GPS receiver, and map information stored in the map data storage control device 100. Based on the above, the current position of the vehicle on the map is detected. The own vehicle position detection unit 160 outputs current position information indicating the detected current position of the vehicle to the display screen generation unit 280 and the storage control unit 340 of the map data storage control device 100. The own vehicle position detection unit 160 may detect the current position of the vehicle using an autonomous navigation sensor instead of or in addition to the GPS receiver.

  The operation input unit 180 inputs an operation instruction from the user when the map data storage control device 100 downloads and stores the detailed map data stored in the map data storage medium 140 into the map data storage unit 240. In the present embodiment, the operation input unit 180 includes an input device such as an operation panel or a remote controller, for example. The display 200 (corresponding to the display device of the present invention) displays various screens generated by the map data storage control device 100.

  Next, the internal configuration of the map data storage control device 100 will be described. The map data storage control device 100 includes a storage medium reading unit 220, a map data storage unit 240, a free space detection unit 260, a display screen generation unit 280, a display control unit 300, an operation reception unit 320, and a storage control unit 340. Has been. The display screen generation unit 280 corresponds to the area display screen generation unit of the present invention.

  The storage medium reading unit 220 receives a reading instruction from the storage control unit 340 and is designated by the storage control unit 340 from the map data storage medium 140 inserted in the storage medium insertion unit (not shown) included in the navigation system 120. The read detailed map data is output to the storage control unit 340. Further, the storage medium reading unit 220 determines whether or not the map data storage medium 140 is inserted in the storage medium insertion unit. If the map data storage medium 140 is not inserted, the display screen generation unit 280 indicates that fact. Notify When the map data storage medium 140 is inserted, the storage medium reading unit 220 notifies the storage control unit 340 to that effect.

  The map data storage unit 240 stores in advance wide area map data of all prefectures in Japan. This wide area map data includes map data capacity information indicating the capacity of detailed map data of each area stored in the map data storage medium 140. In addition, the map data storage unit 240 stores the detailed map data output from the storage control unit 340 in addition to the wide area map data. In the present embodiment, the map data storage unit 240 is a non-volatile flash memory.

  When the detailed map data stored in the map data storage medium 140 is stored in the map data storage unit 240, the free capacity calculation unit 260 stores the detailed map data in the map data storage unit 240 as a capacity of the detailed map data that can be additionally stored. Calculate free space. In addition, the free space calculation unit 260 outputs the free space information indicating the calculated free space in the map data storage unit 240 to the display screen generation unit 280.

  The display screen generation unit 280 reads the wide area map data from the map data storage unit 240 when generating the area display screen. The display screen generation unit 280 is included in the free space of the map data storage unit 240 indicated by the free space information output from the free space calculation unit 260 and the wide area map data output from the map data storage unit 240. The area of the detailed map data of each area indicated by the map data capacity information is compared to obtain an area where the detailed map data has a capacity equal to or less than the free capacity, and an area display screen for displaying the obtained area is generated. The display screen generation unit 280 generates an area display screen including a map of a predetermined scale by narrowing down to the area around the current position of the vehicle indicated by the current position information output from the vehicle position detection unit 160. . The display screen generation unit 280 outputs the generated area display screen to the display control unit 300 as area display screen data. The display control unit 300 displays an area display screen on the display 200 based on the area display screen data output from the display screen generation unit 280.

  Also, the display screen generation unit 280 receives notification from the storage medium reading unit 220 that the map data storage medium 140 is not inserted into the storage medium insertion unit, and inserts the storage medium of the map data storage medium 140 into the user. An error display screen that prompts insertion into the display unit is generated and output to the display control unit 300. The display control unit 300 displays the error display screen output by the display screen generation unit 280 on the display 200.

  The operation reception unit 320 additionally stores detailed map data in the map data storage unit 240 from each area included in the area display screen displayed by the display control unit 300 via the operation input unit 180. A selection operation for selecting any one of the areas is accepted. In this case, the operation reception unit 320 outputs additional storage target area information indicating the additional storage target area selected according to the received selection operation to the display screen generation unit 280 and the storage control unit 340.

  When the additional storage target area information is output from the operation reception unit 320, the display screen generation unit 280 adds the additional storage from the free space of the map data storage unit 240 indicated by the free space information output by the free space calculation unit 260. Based on the capacity obtained by subtracting the capacity of the detailed map data in the area indicated by the target area information (specified by the map data capacity information output from the map data storage section 240) and the map data capacity information output from the map data storage section 240 The area of the detailed map data of each area shown is compared, the area having the capacity of the detailed map data equal to or smaller than the subtracted capacity is obtained, and an area display screen for displaying the obtained area is generated. The display control unit 300 displays the area display screen generated by the display screen generation unit 280 on the display 200.

  Further, the operation receiving unit 320 deletes the detailed map data from the map data storage unit 240 from each area included in the area display screen displayed by the display control unit 300 via the operation input unit 180. A selection operation for selecting any area as the target area is accepted. In this case, the operation reception unit 320 outputs deletion target area information indicating the deletion target area selected according to the received selection operation to the display screen generation unit 280 and the storage control unit 340.

  When the deletion target area information is output from the operation reception unit 320, the display screen generation unit 280 displays the deletion target area in the free space of the map data storage unit 240 indicated by the free space information output from the free space calculation unit 260. It is indicated by the capacity obtained by adding the capacity of the detailed map data in the area indicated by the information (specified by the map data capacity information output from the map data storage section 240) and the map data capacity information output from the map data storage section 240. The area of the detailed map data of each area is compared, an area having a capacity equal to or smaller than the added capacity of the detailed map data is obtained, and an area display screen for displaying the obtained area is generated. The display control unit 300 displays the area display screen generated by the display screen generation unit 280 on the display 200.

  Further, the operation accepting unit 320 additionally stores the detailed map data of the area selected as described above in the map data storage unit 240 via the operation input unit 180 and the detailed map data of the selected area on the map. An execution operation for executing a process to be deleted from the data storage unit 240 is accepted. In this case, the operation reception unit 320 outputs execution operation information indicating that the execution operation has been received to the storage control unit 340.

  When the storage control unit 340 receives a notification from the storage medium reading unit 220 that the map data storage medium 140 has been inserted into the storage medium insertion unit, the storage control unit 340 uses the vehicle position information output from the vehicle position detection unit 160. The detailed map data of the area including the current position of the vehicle shown and the surrounding area is acquired from the map data storage medium 140 via the storage medium reading unit 220, and the acquired detailed map data is stored in the map data storage unit 240. At this time, if the detailed map data is already stored in the map data storage unit 240, after deleting all the detailed map data, the detailed map data of the peripheral area of the current position is acquired from the map data storage medium 140. The data is stored in the map data storage unit 240.

  When the storage control unit 340 receives the additional storage target area information from the operation receiving unit 320 and then receives the execution operation information, the storage control unit 340 stores the detailed map data of the area indicated by the additional storage target area information as the storage medium reading unit. The data is read from the map data storage medium 140 via 220 and stored in the map data storage unit 240. In addition, when the storage control unit 340 receives the execution operation information after receiving the deletion target area information from the operation receiving unit 320, the storage control unit 340 transmits detailed map data of the area indicated by the deletion target area information from the map data storage unit 240. delete.

  Next, a specific example of an operation in which the map data storage control device 100 downloads and stores detailed map data stored in the map data storage medium 140 for each area in the map data storage unit 240 for each area. This will be described with reference to FIG.

  FIG. 2 is a diagram illustrating an example of an area display screen displayed on the display 200 by the operation of the map data storage control device 100 according to the present embodiment. 2A to 2C show how the area display screen displayed on the display 200 changes in response to a user operation via the operation input unit 180. FIG. In describing FIG. 2 (hereinafter, the same applies to FIGS. 5 and 8), the capacity of the map data storage unit 240 is 2.0 [GB], and the capacity corresponding to 0.5 [GB] of the capacity is It is assumed that it is used as a storage area for wide-area map data throughout Japan. That is, the total capacity capable of storing detailed map data in the map data storage unit 240 is 1.5 [GB].

  FIG. 2A shows an area display screen displayed on the display 200 when the map data storage medium 140 is inserted into the storage medium insertion unit of the map data storage control device 100. As the operation of the map data storage control device 100 in this case, the vehicle position detection unit 160 detects the current position of the vehicle (Tokyo in this embodiment). The storage control unit 340 stores detailed map data of the area (Tokyo) including the current position of the vehicle detected by the own vehicle position detection unit 160 and its surrounding areas (Kanagawa and Saitama Prefecture in this embodiment). The detailed map data acquired from the map data storage medium 140 via the medium reading unit 220 is stored in the map data storage unit 240. Which area is set as the peripheral area with respect to the area at the current position is determined in advance by table information, for example. The table information in this case is stored in advance in the map data storage unit 240.

  Thereafter, the free space calculation unit 260 calculates a free space in which detailed map data can be additionally stored in the map data storage unit 240. In the example of FIG. 2A, detailed map data for Tokyo, Kanagawa, and Saitama prefectures is stored in the map data storage unit 240. Therefore, the free space that can store the detailed map data in the map data storage unit 240 is as follows. From the total capacity (1.5 [GB]) that could originally store detailed map data in the map data storage unit 240, the total capacity of detailed map data for Tokyo, Kanagawa and Saitama prefectures (1.3 [ GB]) is subtracted from the capacity (0.2 [GB]).

  Next, the display screen generation unit 280 includes the free space (0.2 [GB]) calculated by the free space calculation unit 260 and the capacity of detailed map data of each area stored in the map data storage medium 140 ( The area of the detailed map data that can be additionally stored in the map data storage unit 240 from the map data storage medium 140 by comparing with the map data storage information stored in advance in the map data storage unit 240 (that is, the details) An area display screen for displaying the map data having an empty capacity (0.2 [GB]) or less) is generated. Next, the display control unit 300 displays the area display screen generated by the display screen generation unit 280 on the display 200. FIG. 2A shows the area display screen displayed at this time.

  As shown in FIG. 2 (a), the left side of the area display screen displayed on the display 200 includes six cities and six prefectures as a wide area map including the current position of the vehicle detected by the vehicle position detection unit 160. A wide area map 400 indicating the Kanto area is displayed using the wide area map data in the map data storage unit 240. Furthermore, on the wide area map 400, the vehicle position mark is displayed superimposed on the current position of the vehicle detected by the vehicle position detection unit 160.

  The wide area map 400 displays the capacity of detailed map data for each area. For example, in the case of Tokyo detailed map data, the capacity required for storing in the map data storage unit 240 is 0.6 [GB]. Further, in the wide area map 400, the area in which the detailed map data is stored in the map data storage unit 240 by the storage control unit 340 when the map data storage medium 140 is inserted into the storage medium insertion unit of the map data storage control device 100. (In this embodiment, Tokyo, Kanagawa Prefecture, Saitama Prefecture) and an area of detailed map data that can be additionally stored in the map data storage unit 240 (in this embodiment, the capacity of the detailed map data is 0.2. [GB] Gunma Prefecture, Tochigi Prefecture, and Ibaraki Prefecture) and the area of detailed map data that cannot be additionally stored (in this embodiment, the capacity of the detailed map data is larger than 0.2 [GB]. “Chiba Prefecture” is displayed in different colors.

  For example, the area where the detailed map data is stored in the map data storage unit 240 is displayed in dark green. The area of the detailed map data that can be additionally stored in the map data storage unit 240 is displayed in light green. The area of detailed map data that cannot be additionally stored in the map data storage unit 240 is displayed in black.

  As shown in FIG. 2A, on the right side of the area display screen displayed on the display 200, there is a capacity of detailed map data stored in the map data storage unit 240 (in FIG. 2, “current download capacity”). Is displayed using a pie chart 410 as well as a numerical display. By referring to the current download capacity and the pie chart 410, the map data storage unit 240 has already stored the detailed map data in the map data storage unit 240 out of the total capacity (1.5 [GB]). It can be seen that the capacity of the stored detailed map data is 1.3 [GB], that is, the free capacity is 0.2 [GB].

  Further, on the right side of the area display screen, a download start button 420 that is pressed to download and store the detailed map data stored in the map data storage medium 140 for each area in the map data storage unit 240, and the wide area map 400. Is pressed to select one of the areas included in the map (Kanto area in FIG. 2A) as an area to be additionally stored with detailed map data in the map data storage unit 240. An add button 430 and a delete button 440 that is pressed to select one of the areas included in the wide area map 400 as an area to be deleted from the map data storage unit 240 as detailed map data. It is displayed.

  FIG. 2B shows that Kanagawa Prefecture in the wide area map 400 is the deletion target area after the delete button 440 in the area display screen shown in FIG. 2A is pressed through a user operation on the operation input unit 180. An example of an area display screen displayed on the display 200 when selected is shown. As shown in FIG. 2B, when Kanagawa Prefecture is selected as the deletion target area in the wide area map 400, the color of the area indicating Kanagawa Prefecture is changed from dark green to gray displaying the deletion target area. The current download capacity displayed on the right side of the area display screen is that of the area (Kanagawa) selected as the area to be deleted from the current download capacity (1.3 [GB]) shown in FIG. The capacity is changed to a capacity (0.9 [GB]) obtained by subtracting the capacity (0.4 [GB]) of the detailed map data. That is, the free space that can store the detailed map data in the map data storage unit 240 is 0.6 [GB].

  In this case, the detailed map data capacity (0.3 [GB]) of Chiba Prefecture, which is an area that cannot be additionally stored in the map data storage unit 240 on the area display screen shown in FIG. Below the free space (0.6 [GB]) after selecting Kanagawa Prefecture as the area to be deleted. Therefore, the color of the area indicating Chiba prefecture in the wide area map 400 is the area of the detailed map data (Gunma prefecture, Tochigi prefecture, Ibaraki prefecture) where the detailed map data can be additionally stored in the map data storage unit 240 originally. ) And the same color (light green).

  As an operation of the map data storage control device 100 in FIG. 2B, the operation accepting unit 320 deletes the detailed map data from each area included in the area display screen displayed by the display control unit 300. A selection operation for selecting Kanagawa Prefecture as an area is accepted. Next, the display screen generation unit 280 adds the capacity (0.4 [GB]) of the detailed map data of the area to be deleted (Kanagawa) to the free capacity (0.2 [GB]) calculated by the free capacity calculation unit 260. ) (0.6 [GB]) and the detailed map data capacity of each area stored in the map data storage medium 200 are compared, and the detailed map data capacity is 0.6 [GB]. ] Find the following areas (Gunma, Tochigi, Ibaraki and Chiba). And the area display screen which displays the calculated | required area is produced | generated. Next, the display control unit 300 displays the area display screen generated by the display screen generation unit 280 on the display 200.

  FIG. 2C shows the Tochigi Prefecture, Ibaraki Prefecture and Chiba in the wide area map 400 after the add button 430 in the area display screen shown in FIG. 2B is pressed through a user operation on the operation input unit 180. An example of an area display screen displayed on the display 200 when a prefecture is selected as an additional storage target area is shown. As shown in FIG. 2 (c), when Tochigi, Ibaraki and Chiba prefectures are selected as additional target areas in the wide area map 400, the color of the areas indicating Tochigi, Ibaraki and Chiba prefectures changes from light green to yellow. Is done. The current download capacity displayed on the right side of the area display screen is an area (Tochigi Prefecture, Ibaraki) selected as an additional target area from the current download capacity (0.9 [GB]) shown in FIG. The total capacity (0.6 [GB]) of detailed map data of prefectures and Chiba prefectures is added to the capacity (1.5 [GB]). That is, the free space that can store the detailed map data in the map data storage unit 240 is 0.0 [GB].

  In this case, the detailed map data capacity (0.2 [GB]) of Gunma Prefecture, which was an area of detailed map data that can be additionally stored in the map data storage unit 240 on the area display screen shown in FIG. ) Exceeds the free space (0.0 [GB]) after selecting Tochigi, Ibaraki and Chiba as additional target areas. Therefore, the color of the area indicating Gunma Prefecture in the wide area map 400 is the area of the detailed map data (Chiba Prefecture) in which it is impossible to additionally store the detailed map data in the map data storage unit 240 in FIG. ) And the same color (black).

  As an operation of the map data storage control device 100 in FIG. 2C, the operation accepting unit 320 adds detailed map data from each area included in the area display screen displayed by the display control unit 300. A selection operation for selecting Tochigi, Ibaraki and Chiba as areas is accepted. Next, the display screen generation unit 280 adds the capacity of the detailed map data of the additional target areas (Tochigi Prefecture, Ibaraki Prefecture and Chiba Prefecture) to the free space (0.6 [GB]) calculated by the free space calculation unit 260 ( 0.6 [GB]) is subtracted from the capacity (0.0 [GB]) and the detailed map data capacity of each area stored in the map data storage medium 200 is compared. Is determined to be an area having a free capacity (0.0 [GB]) or less. Then, the display screen generation unit 280 generates an area display screen that displays the obtained area. In FIG. 2C, there is no area where detailed map data can be additionally stored in the map data storage unit 240. Next, the display control unit 300 displays the area display screen generated by the display screen generation unit 280 on the display 200.

  Here, when the download start button 420 in the area display screen shown in FIG. 2C is pressed, the storage control unit 340 displays the area (Kanagawa Prefecture) selected as the deletion target area in FIG. The detailed map data is deleted from the map data storage unit 240, and the detailed map data of the areas (Tochigi Prefecture, Ibaraki Prefecture and Chiba Prefecture) selected as the additional storage target area in FIG. Via the map data storage medium 140 and stored in the map data storage unit 240.

  Next, an operation example of the map data storage control device 100 in the first embodiment will be described. FIG. 3 is a flowchart showing an operation example of the map data storage control device 100 according to the first embodiment. In the process of step S100 in FIG. 1, for example, the map data storage control device 100 accepts a download request for each area of detailed map data stored in the map data storage medium 140 through a user operation on the operation input unit 180. Start by.

  First, the storage medium reading unit 220 determines whether or not the map data storage medium 140 is inserted in the storage medium insertion unit (step S100). If the storage medium reading unit 220 determines that the map data storage medium 140 is not inserted in the storage medium insertion unit (NO in step S100), the storage medium reading unit 220 stores the map data in the storage medium insertion unit. The display screen generation unit 280 is notified that the storage medium 140 is not inserted. Upon receiving this notification, the display screen generation unit 280 generates an error display screen that prompts the user to insert the map data storage medium 140 into the storage medium insertion unit, and outputs the error display screen to the display control unit 300 (step S120). . The display control unit 300 displays the error display screen output by the display screen generation unit 280 on the display 200 (step S140). Thereafter, the process proceeds to step S100.

  On the other hand, when the storage medium reading unit 220 determines that the map data storage medium 140 is inserted in the storage medium insertion unit (YES in step S100), the storage medium reading unit 220 inserts the map data into the storage medium insertion unit. The storage control unit 340 is notified that the storage medium 140 is inserted. Receiving this notification, the storage control unit 340 acquires the current position of the vehicle detected by the own vehicle position detection unit 160 (step S160). Then, the storage control unit 340 acquires the detailed map data of the area including the current position of the vehicle and the surrounding area from the map data storage medium 140 via the storage medium reading unit 220, and stores the acquired detailed map data in the map data storage The data is stored in the unit 240 (step S180).

  Next, when the detailed map data is stored in the map data storage unit 240, the free space calculation unit 260 calculates a free space that can be additionally stored (step S200). Then, the free space calculation unit 260 outputs the calculated free space to the area display screen generation unit 280. The display screen generation unit 280 acquires map data capacity information representing the capacity of detailed map data of each area stored in the map data storage medium 140 from the map data storage unit 240. Then, the area display screen generation unit 280 compares the free space calculated by the free space calculation unit 260 with the capacity of the detailed map data of each area indicated by the map data capacity information, and stores it in the map data storage unit 240. An area where detailed map data can be additionally stored is obtained. Then, the display screen generation unit 280 generates an area display screen that displays the obtained area (step S220). The display control unit 300 displays the area display screen generated by the display screen generation unit 280 on the display 200 (step S240).

  Next, the operation reception unit 320 receives a selection operation for selecting one of the areas included in the area display screen displayed by the display control unit 300 as an addition target area of the detailed map data. It is determined whether or not (step S260). If the operation reception unit 320 determines that a selection operation for selecting any area as the addition target area of the detailed map data has been received (YES in step S260), the display screen generation unit 280 generates in step S240. Update the contents of the selected area display screen.

  Specifically, the display screen generation unit 280 has a capacity obtained by subtracting the capacity of the detailed map data of the addition target area from the free capacity calculated by the free capacity calculation unit 260, and each of the data stored in the map data storage medium 140. By comparing the capacity of the detailed map data of the area, an area where the detailed map data can be additionally stored in the map data storage unit 240 is obtained. Then, the display screen generation unit 280 generates an area display screen that displays the obtained area (step S280). Next, the display control unit 300 displays the area display screen generated by the display screen generation unit 280 on the display 200 (step S300). Thereafter, the process proceeds to step S260.

  On the other hand, when operation accepting unit 320 determines that a selection operation for selecting any area as the addition target area of the detailed map data has not been accepted (NO in step S260), operation accepting unit 320 uses display control unit It is determined whether or not a selection operation for selecting any area as a deletion target area of the detailed map data is received from each area included in the area display screen displayed by 300 (step S320). If the operation reception unit 320 determines that a selection operation for selecting any area as a deletion target area of the detailed map data has been received (YES in step S320), the display screen generation unit 280 generates in step S240. Update the contents of the selected area display screen.

  Specifically, the display screen generation unit 280 includes a capacity obtained by adding the capacity of the detailed map data of the area to be deleted to the free capacity calculated by the free capacity calculation unit 260, and each of the data stored in the map data storage medium 140. By comparing the capacity of the detailed map data of the area, an area where the detailed map data can be additionally stored in the map data storage unit 240 is obtained. Then, the display screen generation unit 280 generates an area display screen that displays the obtained area (step S340). Next, the display control unit 300 displays the area display screen generated by the display screen generation unit 280 on the display 200 (step S360). Thereafter, the process proceeds to step S260.

  On the other hand, when operation accepting unit 320 determines that a selection operation for selecting any area as a deletion target area of the detailed map data has not been accepted (NO in step S320), operation accepting unit 320 uses display control unit It is determined whether or not an operation of pressing the download start button 420 included in the area display screen displayed by 300 has been received (step S380). If operation accepting unit 320 determines that an operation to press download start button 420 is not accepted (NO in step S380), the process transitions to step S260.

  On the other hand, when operation receiving unit 320 determines that an operation for pressing download start button 420 has been received (YES in step S380), storage control unit 340 stores detailed map data of the area selected as the area to be deleted as a map. While deleting from the data storage part 240, the detailed map data of the area selected as an addition object area are read from the map data storage medium 140, and are memorize | stored in the map data storage part 240 (step S400). Thereafter, when the process of step S400 is completed, the map data storage control device 100 ends the process in FIG.

  As described above in detail, in this embodiment, the map data storage unit 240 compares the free capacity of the map data storage unit 240 with the capacity of the detailed map data of each area stored in the map data storage medium 140. An area in which the detailed map data can be additionally stored is obtained in 240, and an area display screen for displaying the obtained area is generated and displayed on the display 200.

  Thereby, the area of the detailed map data that can be stored in the map data storage unit 240 from the detailed map data that is divided and stored for each area in the map data storage medium 140 is automatically displayed on the screen. . Therefore, the user who viewed the screen display does not care whether or not the detailed map data of the area to be selected as the storage target can be additionally stored in the map data storage unit 240, and does not care about whether the detailed map data is stored in the area displayed on the screen. By selecting one of the areas as appropriate, the detailed map data of the desired area can be reliably stored in the map data storage unit 240. Therefore, the user can easily select an area for storing the detailed map data in the map data storage unit 240 (flash memory).

  Further, according to the present embodiment, the display screen generating unit 280 displays the area where the detailed map data can be additionally stored in the map data storage unit 240 and the area where the additional map cannot be stored in different colors. Generate an area display screen to be used. Thereby, the user who sees the screen display can clearly grasp the area where the detailed map data can be additionally stored in the map data storage unit 240 and the area where the additional map cannot be stored.

  Further, according to the present embodiment, the screen generation unit 280 stores the map data from the information indicating the free capacity of the map data storage unit 240 and the detailed map data of each area stored in the map data storage medium 140. An area display screen is generated on which information indicating the capacity of the detailed map data of the area that can be additionally stored in the unit 240 is displayed for each area. As a result, the user who sees the screen display has not only an area where detailed map data can be additionally stored in the map data storage unit 240 but also an area where additional map data can be stored in the map data storage unit 240. You can know how much is there. Further, by displaying the free capacity of the map data storage unit 240 on the area display screen using the pie chart 410, it is possible to intuitively grasp the free capacity of the map data storage unit 240.

  Next, a second embodiment of the present invention will be described. The second embodiment is characterized in that the display scale of the detailed map data stored in the map data storage unit 240 from the map data storage medium 140 can be arbitrarily selected. FIG. 4 is a block diagram showing a configuration example of the navigation system 120 including the map data storage control device 100 ′ according to the second embodiment. In FIG. 4, those given the same reference numerals as those shown in FIG. 1 have the same functions, and therefore redundant description is omitted here.

  In the second embodiment, the map data storage control device 100 ′ further includes a scale selection operation accepting unit 360 in addition to the configuration shown in FIG. 1. The map data storage control device 100 'includes a map data storage unit 240' instead of the map data storage unit 240 of FIG. The map data storage control device 100 'includes a display screen generation unit 280' instead of the display screen generation unit 280 of FIG. The map data storage control device 100 'includes a storage control unit 340' instead of the storage control unit 340 of FIG. In the second embodiment, the map data storage medium 140 stores detailed map data of display scales of a total of five levels of “10 km”, “1 km”, “500 m”, “50 m”, and “25 m” for each area. It is assumed that it is stored in

  Similar to the first embodiment, the map data storage unit 240 'stores wide area map data in advance. In the second embodiment, the wide area map data includes second map data capacity information indicating the capacity of detailed map data of each display scale in each area stored in the map data storage medium 140 for each display scale. .

  The scale selection operation receiving unit 360 receives a scale selection operation for selecting a display scale of detailed map data to be stored in the map data storage unit 240 ′ via the operation input unit 180. In this case, the scale selection operation reception unit 360 outputs display scale information indicating the display scale selected according to the received scale selection operation to the display screen generation unit 280 ′ and the storage control unit 340 ′.

  The display screen generation unit 280 'has a function of generating a scale setting screen for setting a display scale of detailed map data additionally stored in the map data storage unit 240 from the map data storage medium 140. Further, the display screen generation unit 280 ′ outputs the generated scale setting screen to the display control unit 300. The display control unit 300 displays the scale setting screen output by the display screen generation unit 280 ′ on the display 200.

  The display screen generation unit 280 'also has a function of generating an area display screen. When the area display screen is generated, the display screen generation unit 280 'reads the second map data capacity information from the map data storage unit 240'. Then, the display screen generation unit 280 ′ uses the free space in the map data storage unit 240 ′ indicated by the free space information output from the free space calculation unit 260 and the display scale information output from the scale selection operation reception unit 360. Compare the capacity of the detailed map data of each area corresponding to the displayed display scale (specified by the second map data capacity information output from the map data storage unit 240 ′) and compare the detailed map data corresponding to the display scale. Generate an area display screen that displays areas with a capacity less than or equal to the free capacity.

  In addition, the display screen generation unit 280 ′ receives a notification from the storage medium reading unit 220 that the map data storage medium 140 is not inserted in the storage medium insertion unit, and notifies the user of the storage medium of the map data storage medium 140. An error display screen that prompts insertion into the insertion unit is generated and output to the display control unit 300. The display control unit 300 displays the error display screen output by the display screen generation unit 280 ′ on the display 200.

  Further, when the additional storage target area information is output from the operation reception unit 320, the display screen generation unit 280 ′ displays the free space in the map data storage unit 240 ′ indicated by the free space information output from the free space calculation unit 260. The capacity of the detailed map data corresponding to the display scale indicated by the display scale information output from the scale selection operation accepting unit 360 in the area indicated by the additional storage target area information (the first data output from the map data storage unit 240 ′) 2) (specified by the map data capacity information) and the capacity of the detailed map data of each area corresponding to the display scale (specified by the second map data capacity information output from the map data storage unit 240 ′). An area display screen that displays an area where the capacity of the detailed map data corresponding to the display scale is less than the available capacity. To generate. The display control unit 300 displays the area display screen generated by the display screen generation unit 280 ′ on the display 200.

  Further, when the deletion target area information is output from the operation reception unit 320, the display screen generation unit 280 determines the free space in the map data storage unit 240 ′ indicated by the free space information output from the free space calculation unit 260. The capacity obtained by adding the capacity of the detailed map data stored in the map data storage unit 240 ′ (specified by the map data capacity information output from the map data storage unit 240 ′) in the area indicated by the deletion target area information, and the scale The capacity of detailed map data in each area corresponding to the display scale indicated by the display scale information output from the selection operation accepting unit 360 (specified by the second map data capacity information output from the map data storage unit 240 ′). In comparison, the area display that displays the area where the capacity of the detailed map data corresponding to the display scale is less than the free capacity A surface is generated. The display control unit 300 displays the area display screen generated by the display screen generation unit 280 ′ on the display 200.

  The storage control unit 340 ′ receives the vehicle position information output from the vehicle position detection unit 160 when receiving a notification from the storage medium reading unit 220 that the map data storage medium 140 has been inserted into the storage medium insertion unit. The detailed map data of the area including the current position of the vehicle indicated by and the surrounding area is acquired from the map data storage medium 140 via the storage medium reading unit 220, and the acquired detailed map data is stored in the map data storage unit 240 ′. Let At this time, if the detailed map data is already stored in the map data storage unit 240, after deleting all the detailed map data, the detailed map data of the peripheral area of the current position is acquired from the map data storage medium 140. It is stored in the map data storage unit 240 ′.

  In addition, when the storage control unit 340 ′ receives the additional operation target area information from the operation receiving unit 320 and then receives the execution operation information, the storage control unit 340 ′ selects the detailed map data of the area indicated by the additional storage target area information on the scale. Only the portion corresponding to the display scale indicated by the display scale information output by the operation receiving unit 360 is read from the map data storage medium 140 via the storage medium reading unit 220 and stored in the map data storage unit 240 ′. When the storage control unit 340 ′ receives the execution operation information after receiving the deletion target area information from the operation reception unit 320, the storage control unit 340 ′ displays the detailed map data of the area indicated by the deletion target area information as the map data storage unit 240. Remove from '.

  Next, the map data storage control device 100 ′ downloads and stores detailed map data stored in the map data storage medium 140 for each area and each display scale in the map data storage unit 240 ′ for each area. A specific example of the operation to be performed will be described with reference to FIG. FIG. 5A is a diagram illustrating an example of a scale setting screen displayed on the display 200 according to the present embodiment. FIGS. 5B and 5C show how the area display screen displayed on the display 200 changes in response to a scale setting operation on the operation input unit 180.

  FIG. 5A shows a scale setting screen displayed on the display 200 after the free space calculation unit 260 calculates a free space in which detailed map data can be additionally stored in the map data storage unit 240 ′. . FIG. 5A shows a state where “10 km”, “1 km”, and “500 m” are selected as display scales of the detailed map data stored in the map data storage unit 240 ′ on the scale setting screen. As an operation of the map data storage control device 100 ′ in this case, the scale selection operation accepting unit 360 is set to “10 km” as the display scale of the detailed map data to be stored in the map data storage unit 240 ′ via the operation input unit 180. A scale selection operation for selecting “1 km” and “500 m” is accepted.

  FIG. 5B shows a case where the display scale of the detailed map data stored in the map data storage unit 240 ′ is not set for comparison with the first embodiment, that is, the detailed map data of all display scales. Is an area display screen displayed on the display 200 when the map data storage medium 140 is inserted into the storage medium insertion unit of the map data storage control device 100 ′. The area display screen shown in FIG. 5B is the same as that shown in FIG.

  FIG. 5C shows an area display screen displayed on the display 200 when the display scale of the detailed map data stored in the map data storage unit 240 ′ is set. As shown in FIG. 5C, the area other than the area where the detailed map data (all display scales) is downloaded when the map data storage medium 140 is inserted into the storage medium insertion part of the map data storage control device 100 ′. For each area (Gunma, Tochigi, Ibaraki and Chiba), the capacity required to store the detailed map data in the map data storage unit 240 ′ is shown in the scale setting screen shown in FIG. The volume of detailed map data corresponding to the selected display scale has been changed.

  For this reason, in the area display screen shown in FIG. 5 (b), a part of the selected Chiba Prefecture, which was an area where it was impossible to additionally store the detailed map data of all scales in the map data storage unit 240 ′. The capacity (0.15 [GB]) of the detailed map data at the display scale is smaller than the free capacity (0.2 [GB]) of the map data storage unit 240 ′. Thereby, the color of the area indicating Chiba Prefecture in the wide area map 400 is the same color as the area (Gunma Prefecture, Tochigi Prefecture, Ibaraki Prefecture) in which the detailed map data can be additionally stored in the map data storage unit 240 ′ ( Light green).

  As an operation of the map data storage control device 100 ′ in FIG. 5C, the display screen generation unit 280 ′ uses the free space (0.2 [GB]) of the map data storage unit 240 ′ calculated by the free space calculation unit 260. ) And the capacity of the detailed map data in each area corresponding to the display scales (“10 km”, “1 km”, and “500 m”) selected according to the scale selection operation received by the scale selection operation receiving unit 360. In comparison, an area where the capacity of the detailed map data corresponding to the selected display scale is 0.2 [GB] or less is obtained. Then, the display screen generation unit 280 generates an area display screen that displays the obtained area.

  Next, an operation example of the map data storage control device 100 ′ in the second embodiment will be described. FIG. 6 is a flowchart showing an operation example of the map data storage control device 100 ′ according to the second embodiment. In the process of step S500 in FIG. 6, for example, the map data storage control device 100 ′ accepts a download request for detailed map data stored in the map data storage medium 140 through a user operation on the operation input unit 180. Start with.

  First, the storage medium reading unit 220 determines whether or not the map data storage medium 140 is inserted in the storage medium insertion unit (step S500). If the storage medium reading unit 220 determines that the map data storage medium 140 is not inserted in the storage medium insertion unit (NO in step S500), the storage medium reading unit 220 notifies the display screen generation unit 280 ′. To do. In response to this notification, the display screen generation unit 280 ′ generates an error display screen that prompts the user to insert the map data storage medium 140 into the storage medium insertion unit, and outputs the error display screen to the display control unit 300 (step S520). ). The display control unit 300 displays the error display screen output by the display screen generation unit 280 'on the display 200 (step S540). Thereafter, the process proceeds to step S500.

  On the other hand, when the storage medium reading unit 220 determines that the map data storage medium 140 is inserted in the storage medium insertion unit (YES in step S500), the storage medium reading unit 220 notifies the storage control unit 340 ′. . The storage control unit 340 'acquires the current position of the vehicle detected by the own vehicle position detection unit 160 (step S560). Then, the storage control unit 340 ′ acquires the detailed map data of the area including the current position of the vehicle and the surrounding area from the map data storage unit 240 ′ via the storage medium reading unit 220, and the acquired detailed map data is displayed on the map. The data is stored in the data storage unit 240 ′ (step S580).

  Next, the free space calculation unit 260 calculates a free space in which detailed map data can be additionally stored in the map data storage unit 240 '(step S600). Then, the free space calculation unit 260 outputs the calculated free space to the display screen generation unit 280 '.

  Next, the map data storage control device 100 'performs a scale setting process (step S620). FIG. 7 is a flowchart showing a specific flow of the scale setting process of the map data storage control device 100 ′ according to the second embodiment. First, the display screen generation unit 280 'generates a scale setting screen for setting the display scale of detailed map data to be additionally stored in the map data storage unit 240', and outputs the scale setting screen to the display control unit 300 (step S900). The display control unit 300 displays the scale setting screen generated by the display screen generation unit 280 'on the display 200 (step S920).

  Next, the scale selection operation receiving unit 360 determines whether or not a scale selection operation for selecting a display scale of detailed map data to be stored in the map data storage unit 240 ′ has been received (step S <b> 940). If scale selection operation accepting unit 360 determines that the scale selection operation has not been accepted (NO in step S940), the process proceeds to step S940, and the scale selection operation accepting unit until the scale selection operation is accepted. 360 repeats the determination process of step S940.

  On the other hand, when scale selection operation accepting unit 360 determines that a scale selection operation has been accepted (YES in step S940), scale selection operation accepting unit 360 displays a display scale that indicates the display scale selected in accordance with the scale selection operation. The information is output to the display screen generation unit 280 ′ and the storage control unit 340 ′ (step S960). Thereafter, when the process of step S960 is completed, the map data storage control device 100 'ends the scale setting process in FIG.

  In step S640 of FIG. 6, the display screen generation unit 280 ′ displays the second map representing the capacity of the detailed map data of each area corresponding to the display scale indicated by the display scale information output by the scale selection operation receiving unit 360. Data capacity information is acquired from the map data storage unit 240 ′. Then, the display screen generation unit 280 ′ compares the free space calculated by the free space calculation unit 260 with the detailed map data capacity of each area indicated by the second map data capacity information, and the map data storage unit An area where the detailed map data can be additionally stored is obtained in 240 ′. Then, the display screen generation unit 280 'generates an area display screen that displays the obtained area (step S640). The display control unit 300 displays the area display screen generated by the display screen generation unit 280 'on the display 200 (step S660).

  Next, the operation reception unit 320 receives a selection operation for selecting one of the areas included in the area display screen displayed by the display control unit 300 as an addition target area of the detailed map data. It is determined whether or not (step S680). If the operation reception unit 320 determines that a selection operation for selecting any area as the addition target area of the detailed map data has been received (YES in step S680), the display screen generation unit 280 ′ determines in step S640. Update the contents of the generated area display screen.

  Specifically, the display screen generation unit 280 ′ corresponds to the display scale indicated by the display scale information output from the scale selection operation accepting unit 360 in the addition target area from the free space calculated by the free space calculation unit 260. An area where the detailed map data can be additionally stored in the map data storage unit 240 ′ by comparing the capacity obtained by subtracting the capacity of the detailed map data with the capacity of the detailed map data in each area corresponding to the display scale. Ask for. And the area display screen which displays the calculated | required area is produced | generated (step S700). Next, the display control unit 300 displays the area display screen generated by the display screen generation unit 280 'on the display 200 (step S720). Thereafter, the process proceeds to step S680.

  On the other hand, when operation accepting unit 320 determines that a selection operation for selecting any area as the addition target area of the detailed map data has not been accepted (NO in step S680), operation accepting unit 320 uses display control unit It is determined whether or not a selection operation for selecting any area as a deletion target area of the detailed map data is received from each area included in the area display screen displayed by 300 (step S740). If the operation reception unit 320 determines that a selection operation for selecting any area as a deletion target area of the detailed map data has been received (YES in step S740), the display screen generation unit 280 ′ determines in step S640. Update the contents of the generated area display screen.

  Specifically, the display screen generation unit 280 ′ has a capacity obtained by adding the capacity of the detailed map data stored in the map data storage unit 240 ′ in the area to be deleted to the free capacity calculated by the free capacity calculation unit 260. The detailed map data is additionally stored in the map data storage unit 240 ′ by comparing the capacity of the detailed map data of each area corresponding to the display scale indicated by the display scale information output from the scale selection operation receiving unit 360. Ask for an area where you can. Then, the display screen generation unit 280 'generates an area display screen that displays the obtained area (step S760). Next, the display control unit 300 displays the area display screen generated by the display screen generation unit 280 'on the display 200 (step S780). Thereafter, the process proceeds to step S680.

  On the other hand, when operation accepting unit 320 determines that a selection operation for selecting any area as a deletion target area of the detailed map data has not been accepted (NO in step S740), operation accepting unit 320 uses display control unit It is determined whether or not an operation of pressing the download start button 420 included in the area display screen displayed by 300 has been received (step S800). If operation accepting unit 320 determines that an operation for pressing download start button 420 is not accepted (NO in step S800), the process transitions to step S680.

  On the other hand, when the operation accepting unit 320 determines that an operation for pressing the download start button 420 has been accepted (YES in step S800), the storage control unit 340 ′ selects the detailed map data of the area selected as the deletion target area ( The detailed map data corresponding to all display scales stored in the map data storage unit 240 ′ are deleted from the map data storage unit 240 ′, and the detailed map data (scale of the addition target area selected as the addition target area) The detailed map data corresponding to the display scale indicated by the display scale information output from the selection operation accepting unit 360 is stored only in the portion corresponding to the display scale indicated by the display scale information output from the scale selection operation accepting unit 360. Read out from the map data storage medium 140 via the medium reading unit 220 and store the map data It is stored in the 240 '(step S820). Thereafter, when the process of step S820 is completed, the map data storage control device 100 ends the process in FIG.

  As described above in detail, in the second embodiment, the display screen generation unit 280 ′ responds to the free space calculated by the free space calculation unit 260 and the scale selection operation received by the scale selection operation reception unit 360. Compares the capacity of the detailed map data of each area corresponding to the selected display scale, and generates an area display screen that displays areas where the capacity of the detailed map data corresponding to the display scale is less than the free capacity To do.

  Thereby, an area where the detailed map data corresponding to the display scale selected in accordance with the scale selection operation can be stored in the map data storage unit 240 ′ is automatically displayed on the screen. Therefore, the user who viewed the screen display does not care whether or not the detailed map data of the area selected as the additional storage target can be stored in the map data storage unit 240 ′, and any one of the areas displayed on the screen is displayed. By appropriately selecting the area, the detailed map data of the desired area can be reliably stored in the map data storage unit 240 ′. Furthermore, since the detailed map data stored in the map data storage unit 240 ′ can be narrowed down to a portion corresponding to a desired display scale, the capacity of the detailed map data stored in the map data storage unit 240 ′ can be appropriately reduced. Can do. Therefore, detailed map data of as many areas as possible can be stored in the map data storage unit 240 ′.

  In the second embodiment, when the map data storage medium 140 is inserted into the storage medium insertion unit, the detailed map data at all scales is downloaded and additionally stored for the area including the vehicle position and the surrounding area. Although the display scale can be selected for the area, the present invention is not limited to this. For example, the display scale may be selected for the area including the vehicle position and the surrounding area. For areas that are likely to be used immediately around the location of the vehicle, such as the former, a more detailed map is displayed even when traveling on narrow streets by downloading detailed map data at all scales. it can. Therefore, the area that is likely to be used around the vehicle position has an advantage that the detailed map data of all scales can be downloaded without user's trouble and the display scale can be set in other areas.

  In the second embodiment, the example in which the display scale of the detailed map data stored in the map data storage unit 240 ′ is set as the display scale common to each area has been described. However, the display scale of the detailed map data is set for each area. You may make it set to. If this is explained in the flowchart shown in FIG. 6, instead of performing the process of step S620 after step S600, a selection operation for selecting any area as an additional storage target area of the detailed map data is accepted. In the next step (before step S700) after the determination by the operation reception unit 320 (YES in step S680), the process of step S620 may be performed only for the area selected according to the selection operation. .

  Here, a specific example of the operation when the display scale of the detailed map data to be downloaded is set for each area will be described with reference to FIG. FIG. 8A is a diagram illustrating a modified example of the scale setting screen displayed on the display 200. FIGS. 8B and 8C show how the area display screen displayed on the display 200 changes in response to the scale setting operation on the operation input unit 180.

  FIG. 8A shows a scale setting screen displayed on the display 200 after an area for additionally storing detailed map data is selected in the map data storage unit 240 ′. FIG. 8A shows a scale setting screen displayed after Chiba Prefecture is selected. As shown in FIG. 8A, in the scale setting screen, “10 km”, “1 km”, and “500 m” are selected as display scales of the detailed map data to be stored in the map data storage unit 240 ′ regarding Chiba Prefecture. .

  In FIG. 8B, when the display scale of the detailed map data to be stored in the map data storage unit 240 ′ is not set, the map data storage medium 140 is inserted into the storage medium insertion unit of the map data storage control device 100 ′. The area display screen displayed on the display 200 is shown. This area display screen is the same as that shown in FIG.

  FIG. 8C shows an area display screen displayed on the display 200 when the display scale of the detailed map data stored in the map data storage unit 240 ′ is set for the selected Chiba prefecture. As shown in FIG. 8C, the capacity required to store the detailed map data of Chiba Prefecture in the map data storage unit 240 ′ is the display scale selected on the scale setting screen shown in FIG. The capacity of the corresponding detailed map data has been updated. For this reason, in the area display screen shown in FIG. 8B, the selected part of Chiba Prefecture, which was an area where it was impossible to additionally store detailed map data of all display scales in the map data storage unit 240 ′. The capacity (0.15 [GB]) of the detailed map data at the display scale of is less than the free capacity (0.2 [GB]) of the map data storage unit 240 ′. Thereby, the color of the area indicating Chiba Prefecture in the wide area map 400 is the same color as the area (Gunma Prefecture, Tochigi Prefecture, Ibaraki Prefecture) in which the detailed map data can be additionally stored in the map data storage unit 240 ′ ( Light green).

  As described above, if the display scale of the detailed map data is set for each area, the display scale of the detailed map data to be stored in the map data storage unit 240 ′ can be arbitrarily set for each area according to the user's desire. It becomes possible to set, and the convenience of the user can be further improved.

  In the second embodiment, the example of selecting the display scale of the detailed map data to be stored in the map data storage unit 240 ′ on the scale setting screen has been described. However, the detailed map data that is not stored in the map data storage unit 240 ′. The display scale may be selected.

  In the second embodiment, the example of setting the display scale of the detailed map data to be stored in the map data storage unit 240 ′ has been described. However, the display view of the detailed map data to be stored in the map data storage unit 240 ′ (for example, A plane map, a bird's eye view, a 3D map, etc.) may be set. According to this, detailed map data to be stored in the map data storage unit 240 ′ can be narrowed down to a portion corresponding to a desired display view. Therefore, the capacity of the detailed map data to be stored in the map data storage unit 240 ′ is reduced. It can be reduced as appropriate. Therefore, detailed map data of as many areas as possible can be stored in the map data storage unit 240 ′.

  Further, in the first and second embodiments, when the map data storage medium 140 is inserted into the storage medium insertion unit, the storage control unit 340 (340 ′) displays the area including the current position of the vehicle and the surrounding area. Although the detailed map data is acquired from the map data storage medium 140 via the storage medium reading unit 220 and the acquired detailed map data is stored in the map data storage unit 240, the storage control unit 340 (340 ′) is described. The map data storage unit 240 may not store the detailed map data of the area including the current position of the vehicle and the surrounding area.

  In addition, each of the first and second embodiments described above is merely an example of a specific example for carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. It will not be. In other words, the present invention can be implemented in various forms without departing from the spirit or main features thereof.

It is a block diagram which shows the structural example of the map data storage control apparatus by 1st Embodiment. It is a figure which shows the example of the area display screen by 1st Embodiment. It is a flowchart which shows the operation example of the map data storage control apparatus by 1st Embodiment. It is a block diagram which shows the structural example of the map data storage control apparatus by 2nd Embodiment. It is a figure which shows the example of the scale setting screen and area display screen by 2nd Embodiment. It is a flowchart which shows the operation example of the map data storage control apparatus by 2nd Embodiment. It is a flowchart which shows the display scale setting operation example of the map data storage control apparatus by 2nd Embodiment. It is a figure which shows the example of the scale setting screen and area display screen by 2nd Embodiment.

Explanation of symbols

100, 100 ′ Map data storage control device 240, 240 ′ Map data storage unit 260 Free capacity calculation unit 280, 280 ′ Display screen generation unit 300 Display control unit 320 Operation reception unit 340, 340 ′ Storage control unit 360 Scale selection operation reception Part

Claims (5)

A map data storage control device that downloads and stores map data stored in a map data storage medium for each area for each area in a map data storage unit of the device,
A free capacity calculation unit for calculating a free capacity of the map data storage unit;
An area in which the map data has a capacity equal to or less than the free capacity by comparing the free capacity calculated by the free capacity calculator with the capacity of the map data of each area stored in the map data storage medium. An area display screen generation unit for generating an area display screen for displaying the calculated area;
A display controller for displaying the area display screen generated by the area display screen generator on a display device;
An operation accepting unit that accepts a selection operation for selecting one of the areas included in the area display screen displayed by the display control unit;
A storage control unit that reads out map data of an area selected according to the selection operation received by the operation reception unit from the map data storage medium and stores the map data in the map data storage unit; Map data storage controller. The map data storage control device according to claim 1,
The area display screen generation unit is an area display screen that displays an area around the vehicle position detected by the vehicle position detection unit that detects the current vehicle position, and the map data is equal to or less than the free capacity. A map data storage control device for generating an area display screen for displaying an area having a capacity of 1 and an area having a capacity larger than the free capacity in different colors. In the map data storage control device according to claim 1 or 2,
The area display screen generation unit further displays information indicating the free capacity of the map data storage unit and information indicating the capacity of the map data of an area where the map data has a capacity equal to or less than the free capacity for each area. A map data storage control device for generating an area display screen. In the map data storage control device according to any one of claims 1 to 3,
A scale selection operation receiving unit for receiving a scale selection operation for selecting a display scale of map data to be stored in the map data storage unit;
The area display screen generation unit is configured to display the free space calculated by the free space calculation unit and the display scale selected in accordance with the scale selection operation received by the scale selection operation reception unit. A map data storage control device that generates an area display screen that displays an area having a map data capacity corresponding to the display scale having a capacity equal to or less than the free capacity by comparing with a map data capacity. A map data storage control method executed in a map data storage control device that downloads and stores map data stored in a map data storage medium divided into areas for each area in a map data storage unit of the device. ,
A first step in which a free capacity calculation unit of the map data storage control device calculates a free capacity of the map data storage unit;
The area display screen generation unit of the map data storage control device compares the free capacity calculated in the first step with the map data capacity of each area stored in the map data storage medium. A second step of generating an area display screen for displaying an area in which the map data has a capacity equal to or less than the free capacity;
A third step in which a display control unit of the map data storage control device displays the area display screen generated in the second step on a display device;
The operation receiving unit of the map data storage control device receives a selection operation for selecting any area from the areas included in the area display screen displayed in the third step. Steps,
The storage control unit of the map data storage control device reads the map data of the area selected in response to the selection operation received in the fourth step from the map data storage medium and stores it in the map data storage unit And a map data storage control method comprising: