JP2020016814A - Navigation device and navigation method - Google Patents

Abstract

To provide a navigation device which can update map information while suppressing influence on navigation performance.SOLUTION: A navigation device comprises: a storage part for storing map information on a section-by-section basis for sections constituting a map; a map update part for updating the map information stored in the storage part; a map reading part for reading the map information stored in the storage part; and a navigation part for performing navigation on the basis of the map information read by the map reading part. When the map update part updates map information of a plurality of sections stored in the storage part, the number of sections to be updated at a time among the plurality of sections is changed on the basis of a state of navigation performed by the navigation part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a navigation device and a navigation method, and is suitably applied to, for example, a navigation device and a navigation method mounted on a vehicle.

  A car navigation system (hereinafter referred to as a car navigation system) is a device that provides guidance information to a driver with reference to map data stored in a storage. Since the guide information presented by the car navigation system depends on recorded map data, it is desirable to use as new map data as possible. For this reason, technology for updating map data in the background during the execution of car navigation is being developed.

  In recent years, when it is determined that the update data is to be applied to the execution map data by the determination unit, the navigation unit performs the navigation process with reference to the update data, while the determination unit determines that the update data is not applied to the execution map data. And a updating means for updating the map data by using the updating data, wherein the updating means updates the map data by using the updating data. Is disclosed (see Patent Document 1).

International Publication No. 2010/116513

  In the technique described in Patent Literature 1, reduction in navigation performance due to updating of a map in parallel with navigation processing is not considered.

  The present invention has been made in view of the above points, and has as its object to propose a navigation device or the like that can update map information while suppressing the influence on navigation performance.

  In order to solve this problem, in the present invention, for example, a navigation device, a storage unit that stores map information for each section constituting a map, and a map update that updates the map information stored in the storage unit Unit, a map reading unit that reads map information stored in the storage unit, a navigation unit that performs navigation based on the map information read by the map reading unit, the map updating unit, When updating the map information of a plurality of sections stored in the storage section, the number of sections to be updated at one time among the plurality of sections is changed according to a state of navigation performed by the navigation section. did.

  According to the above configuration, the time required for one update can be adjusted by changing the number of sections to be updated at once among a plurality of sections to be updated according to the state of the navigation. In such a case, by reducing the number of sections to be updated so as to shorten the update time, the influence on the time required for display can be suppressed.

  According to the present invention, map information can be appropriately updated.

FIG. 1 is a diagram illustrating an example of a configuration according to a navigation system according to a first embodiment. FIG. 3 is a diagram illustrating an example of map data according to the first embodiment. FIG. 5 is a diagram illustrating an example of update data according to the first embodiment. FIG. 4 is a diagram illustrating an example of distribution data according to the first embodiment. FIG. 9 is a diagram illustrating an example of a parcel update mode according to the first embodiment. FIG. 4 is a diagram illustrating an example of a display mode according to the first embodiment. FIG. 5 is a diagram illustrating an example of an operation sequence according to the first embodiment. FIG. 5 is a diagram illustrating an example of an operation sequence according to the first embodiment. FIG. 5 is a diagram illustrating an example of an operation sequence according to the first embodiment. FIG. 6 is a diagram illustrating an example of a flowchart according to map data update processing according to the first embodiment. FIG. 7 is a diagram illustrating an example of a flowchart according to a map update process A according to the first embodiment. FIG. 6 is a diagram illustrating an example of a flowchart according to a map update process B according to the first embodiment. FIG. 5 is a diagram illustrating an example of an operation sequence according to the first embodiment. FIG. 9 is a diagram illustrating an example of a configuration according to a navigation system according to a second embodiment. FIG. 14 is a diagram illustrating an example of update data according to the second embodiment. FIG. 14 is a diagram illustrating an example of distribution data according to the second embodiment. It is a figure showing an example of the flow chart concerning map update processing A by a 2nd embodiment. It is a figure showing an example of the flow chart concerning map update processing B by a 2nd embodiment. FIG. 14 is a diagram illustrating an example of a flowchart according to a reading process according to the second embodiment. FIG. 14 is a diagram illustrating an example of an operation sequence according to the second embodiment.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 13, and the second embodiment will be described with reference to FIGS. 14 to 20.

(1) First Embodiment In FIG. 1, reference numeral 1 denotes a navigation system according to the first embodiment as a whole. The navigation system 1 updates the map data during the execution of the navigation processing. The navigation system 1 improves the drawing performance of the map during the update of the map data by switching the map update process according to the state of the navigation device 10 when updating the map data.

  FIG. 1 is a diagram illustrating an example of a configuration according to the navigation system 1. The navigation system 1 includes a navigation device 10 and a map distribution server 20. The navigation device 10 and the map distribution server 20 are communicably connected via a communication network 30.

  The navigation device 10 is, for example, a car navigation device mounted on a vehicle such as an automobile. The navigation device 10 calculates a traveling route to a destination using the latest map data distributed from the map distribution server 20, and calculates a predetermined range. , Especially a map around the own vehicle, is drawn and displayed on the display unit 130. In the present embodiment, a case where the navigation device 10 is mounted on an automobile will be described as an example.

  Although only one navigation device 10 is shown in FIG. 1, a plurality of navigation devices may be provided, and the map distribution server 20 can be connected to a plurality of navigation devices 10. However, since the map distribution server 20 performs the same processing for any of the navigation devices 10, the present embodiment will be described with an example in which one navigation device 10 is connected.

  The navigation device 10 includes a control unit 110, a storage unit 120, a display unit 130, an operation unit 140, a sensor unit 150, and a communication unit 160.

  The control unit 110 executes a series of processes related to navigation. The storage unit 120 stores map data 121 and update data 124 including a version DB 122 and an update data DB 123. The display unit 130 displays a navigation screen (for example, a map screen) and presents it to the user. The operation unit 140 receives an input of a destination or the like by a user. The sensor unit 150 acquires the position of the navigation device 10 and the like. The communication unit 160 communicates with the map distribution server 20.

  More specifically, the control unit 110 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory) (not shown), and the CPU expands a program stored in the ROM to the RAM. Then, the functions of the navigation device 10 are realized. The storage unit 120 is, for example, a nonvolatile and rewritable storage device, such as a flash memory or a hard disk. The display unit 130 is, for example, a liquid crystal display. The operation unit 140 is, for example, a plurality of buttons. However, the display unit 130 and the operation unit 140 may be integrally configured as a touch panel.

  The functions of the navigation device 10 (the map updating unit 111, the map reading unit 112, the map drawing unit 113, the route calculating unit 114, and the like) may be configured as dedicated hardware, or may be executed by the control unit 110. It may be configured to be realized as a software module. Further, some of the functions of the navigation device 10 may be realized by another computer that can communicate with the navigation device 10.

  Here, as a function of the navigation device 10, the control unit 110 includes a map updating unit 111, a map reading unit 112, a map drawing unit 113, and a route calculation unit 114, and performs overall navigation processing for guiding a user. And a navigation unit 115 to be implemented. The map update unit 111 acquires the distribution data 181 from the map distribution server 20 and updates the update data 124. The map reading unit 112 reads the map data 121 and the update data 124 from the storage unit 120 and provides them to the map drawing unit 113 and the route calculation unit 114. The map drawing unit 113 draws a map or the like around the position of the own vehicle (own vehicle position) as one process of the navigation unit 115. The route calculation unit 114 calculates a route from the position of the own vehicle to the destination as one process of the navigation unit 115.

  The map distribution server 20 includes a control unit 170, a storage unit 180, and a communication unit 190. The control unit 170 performs a series of processes for distributing map data. The storage unit 180 stores the distribution data 181. The communication unit 190 communicates with the navigation device 10.

  The control unit 170 is, for example, a computer, and includes a CPU, a ROM, and a RAM (not shown), and the CPU realizes functions described later by expanding a program stored in the ROM into the RAM and executing the program. The function of the map distribution server 20 (for example, the map distribution unit 171) may be configured as dedicated hardware, or may be configured as a software module executed by the control unit 170. Further, part of the functions of the map distribution server 20 may be realized by another computer that can communicate with the map distribution server 20. The storage unit 180 is, for example, a nonvolatile and rewritable storage device, such as a flash memory or a hard disk.

  As a function of the map distribution server 20, the control unit 170 implements a map distribution unit 171 that distributes distribution data 181 to the navigation device 10.

  The map distribution server 20 is not limited to a physical machine, and may be, for example, a virtual machine.

  FIG. 2 is a diagram illustrating an example of the map data 121 stored in the navigation device 10.

  Here, in general, car navigation map data is composed of a plurality of sections (hereinafter, referred to as parcels) divided by small rectangles. In addition, it has a plurality of hierarchies, and one parcel in the upper hierarchy corresponds to a plurality of parcels in the lower hierarchy. With such a configuration, for example, only the highways are recorded in the upper hierarchy, and all the roads including the narrow streets are recorded in the lower hierarchy, so that the map display according to the scale and the speed of the route calculation are increased. Is possible.

  The map data 121 includes a parcel ID 210, background data 220, road data 230, and shape data 240. The parcel ID 210 is an ID (identification) for uniquely identifying each parcel. The background data 220 is data for storing shapes of buildings and parks to be drawn on the map screen. The road data 230 is data that stores the type of road (expressway, narrow street, etc.), the cost of passing through each road link, and the like. The shape data 240 is data for storing the shape of the road to be drawn on the map screen.

  In the present embodiment, the map data 121 is composed of two levels, a level 1 level 250 and a level 2 level 260, and one parcel of the level 2 level 260 is 16 levels of the level 1 level 250. A case corresponding to the number of parcels will be described as an example. Further, in the present embodiment, the map updating process is changed according to the parcel relating to the display area 270 indicating the area of the map screen displayed on the display unit 130.

  The map drawing unit 113 refers to all the data 280 of each parcel related to the display area 270 (for example, the background data 220, the road data 230, and the shape data 240 of the parcel “P1-16” at level 1), and refers to each parcel. (For example, a display map of the parcel “P1-16” of the level 250 of the level 1) is displayed on the display unit 130.

  In FIG. 2, the display area 270 is shown in the level 250 and the level 260, but the display unit 130 basically displays the display area 270 in the level 250. One of the map and the map of the level 260 of the hierarchy. However, the map of the level 1 layer 250 and the map of the level 2 layer 260 may be displayed at the top and bottom of the screen of the display unit 130 and displayed simultaneously.

  FIG. 3 is a diagram illustrating an example of the update data 124 stored in the navigation device 10. The update data 124 includes a version DB 122 and an update data DB 123.

  The version DB 122 is a database that stores the version of each parcel. The version DB 122 stores information on the parcel ID 301 and the version 302 in association with each other.

  The update data DB 123 is a database that stores distribution data 181 acquired from the map distribution server 20. The update data DB 123 includes a parcel ID 311, background data 312, road data 313, and shape data 314. The background data 312, the road data 313, and the shape data 314 are the same as the background data 220, the road data 230, and the shape data 240 of the map data 121 described with reference to FIG.

  FIG. 4 is a diagram illustrating an example of the distribution data 181 stored in the map distribution server 20. The distribution data 181 is created in units of one parcel in the level 260 of the map data. The distribution data 181 stores data of one parcel in the level 2 hierarchy 260 and data of 16 parcels in the level 1 hierarchy 250 corresponding to the parcel.

  The distribution data 181 includes a parcel ID 401, background data 402, road data 403, and shape data 404. The background data 402, the road data 403, and the shape data 404 are the same as the background data 220, the road data 230, and the shape data 240 of the map data 121 described with reference to FIG.

  Hereinafter, an operation flow of the navigation system 1 will be described.

  FIG. 5 is a diagram illustrating an example of processing (for example, updating) each parcel when the navigation device 10 calculates a route to a destination (a diagram illustrating an example of a parcel update mode 500).

  The parcel update modes 510, 520, 530, and 540 indicate a plurality of parcels in the level 2 hierarchy 260. In the parcel update modes 510, 520, 530, and 540, a parcel with a pattern means an unprocessed parcel (an unupdated parcel), and a parcel without a pattern indicates a processed parcel (an updated parcel). Parcel).

  The home 511 indicates the position of the home set by the user. In the initial state, none of the parcels has been updated (parcel update mode 510). Next, when the navigation device 10 is activated, the navigation system 1 updates the 25 parcels 521 around the home 511 (parcel update mode 520). Next, when the user sets the destination 531, the navigation system 1 updates the parcel 532 where the destination 531 exists (parcel update mode 530). Next, when the route 541 to the destination 531 is determined, the navigation system 1 updates the plurality of parcels 542 along the route 541 (parcel update mode 540).

  As described above, the navigation system 1 always updates the parcel referred to by the navigation processing to the latest data (the latest version of the parcel).

  When the own vehicle approaches an unupdated parcel (for example, parcel 544) in the traveling direction from the updated parcel (for example, parcel 543), even if the own vehicle runs off the route, the vehicle can be rerouted. Alternatively, a configuration may be adopted in which a parcel that has not been updated in the traveling direction of the host vehicle (for example, parcel 544) is updated.

  FIG. 6 is a diagram illustrating an example of a screen displayed on the display unit 130 of the navigation device 10 when the map (update data 124) is updated as shown in FIG. 5 (an example of a display mode of the display unit 130). FIG.

  Screen 610 shows a state where a map around the home is initialized (initial state). The screen 620 shows a state in which the latest parcels around the home are displayed by processing parcels around the home as in the parcel update mode 520 of FIG.

  Screen 630 is a state in which a list of destination candidates displayed when the user inputs the name of the destination or the like is displayed. On the screen 630, a list of destination candidates is displayed on the right side, and a map around the destination (a plurality of parcels including the destination) is displayed on the left side. As for the map around the destination, an old map is displayed immediately after the destination is selected because the processing is not completed, but the latest map is displayed as soon as the processing around the destination is completed.

  The screen 640 shows a state after the destination is determined and the latest map around the destination is displayed. The screen 650 shows a state immediately after the route to the destination is determined and the navigation is started. Screen 660 shows a state when the vehicle has arrived around the destination.

  In this way, the navigation device 10 processes parcels along the route in parallel with the navigation process, and always provides guidance with the latest data until reaching the vicinity of the destination.

  FIG. 7 is a diagram illustrating an example of a sequence (operation sequence) indicating the operation of the navigation system 1 when performing the operation related to the screen 620 of FIG.

  After the navigation device 10 is activated, the map update unit 111 inquires of the map distribution unit 171 whether there is new map data (new map data) (step S701).

  Next, the map distribution unit 171 responds to the map update unit 111 with information (for example, a base version) capable of identifying the presence or absence of new map data (step S702). The base version indicates the version of the map data 121 and the update data 124 as a whole.

  When there is no new map data (when the base version of the navigation device 10 matches the base version of the map distribution server 20), the navigation device 10 performs a normal navigation process without doing anything. When there is new map data (when the base version of the navigation device 10 does not match the base version of the map distribution server 20), the map update unit 111 sends the map update unit 171 the latest map around the home. Request map data (step S703).

  Next, the map distribution unit 171 distributes the latest map data (delivery data 181) around the home to the map update unit 111 (step S704).

  Next, the map update unit 111 performs a map data update process (step S705). In the map data update process, the update data 124 is updated with the latest map data (delivery data 181) around the received home. The map data update processing will be described later with reference to FIG.

  Next, the map update unit 111 updates the base version of the map data 121 and the update data 124 (Step S706).

  FIG. 8 is a diagram showing an example of an operation sequence of the navigation system 1 when performing the operations related to the screen 630 and the screen 640 of FIG.

  When the user inputs the name of the destination or the like, the map drawing unit 113 requests the map reading unit 112 for map data around the destination (step S801). For example, if there is a destination near the center of the 16 parcels of the level 1 hierarchy 250, the map data around the destination is associated with the 16 parcel map data and the 16 parcels. And the map data of one parcel of the level 2 hierarchy 260 included.

  Next, the map reading unit 112 acquires the parcel version of the map data around the requested destination from the version DB 122 (step S802).

  Next, the map reading unit 112 compares the obtained version with the base version. If the base version is larger (ie, if the parcel around the requested destination has not been updated), the process proceeds from step S803 to step S803. The processing up to S809 is executed.

  In addition, in step S802, if the version of the level 250 is acquired in step S802, it takes time for comparison. Therefore, it is preferable to acquire the version of the level 260. As described above, by comparing the version of the higher hierarchy, the process of confirming whether the requested map data is the latest can be quickly completed.

  The map reading unit 112 first reads old map data from the map data 121 or the update data 124 (Step S803).

  Next, the map reading unit 112 responds to the map drawing unit 113 with the read old map data (step S804). The map drawing section 113 displays map data (old map data) around the destination on the display section 130.

  Next, the map reading unit 112 requests the map updating unit 111 to update the map data around the destination (step S805).

  Next, the map update unit 111 requests the map distribution unit 171 for map data around the destination (step S806).

  Next, the map distribution unit 171 distributes map data (distribution data 181) around the destination to the map update unit 111 (step S807).

  Next, the map update unit 111 performs a map data update process (step S808). In the map data update processing, the update data 124 is updated with the latest map data (delivery data 181) around the destination that has been received. The map data update processing will be described later with reference to FIG.

  Next, the map update unit 111 notifies the map reading unit 112 that the update of the map data around the destination has been completed (update completion notification) (step S809). The update completion notification is performed at an appropriate timing as described later.

  When the version of the parcel acquired in step S802 is equal to or higher than the base version (that is, when the requested parcel has been updated), or when an update completion notification is received from the map updating unit 111 in step S809, the map The reading unit 112 reads the update data 124 of the update data DB 123 (Step S810).

  Next, the map reading unit 112 responds the read update data 124 to the map drawing unit 113 (step S811). When receiving the map data necessary for display, the map drawing unit 113 displays a map around the destination on the display unit 130.

  As described above, the map (latest map) around the destination is displayed on the display unit 130.

  FIG. 9 is a diagram illustrating an example of an operation sequence of the navigation system 1 when performing the operations related to the screen 650 and the screen 660 of FIG.

  When the user requests route calculation to the destination, the route calculation unit 114 starts a route calculation process (step S901). The route calculation processing can be realized by a general shortest route calculation algorithm or the like.

  The route calculation unit 114 requests the map reading unit 112 for map data necessary for the route calculation (step S902). For example, the map data necessary for the route calculation includes map data of a plurality of parcels in the level 2 hierarchy 260 and a map of 16 parcels in the level 1 hierarchy 250 associated with each of the plurality of parcels. And data.

  Next, the map reading unit 112 acquires the parcel version of the requested map data from the version DB 122 (step S903).

  Next, the map reading unit 112 compares the acquired version with the base version. If the base version is larger (ie, if the requested parcel has not been updated), the map reading unit 112 performs steps S904 to S908. Execute the process. Note that, as described above, it is preferable that the map reading unit 112 obtains the version of the level 260 of the hierarchy 260 and compares it.

  First, the map reading unit 112 requests the map updating unit 111 to update the map data necessary for the route calculation (step S904).

  Next, the map updating unit 111 requests the map distribution unit 171 for map data necessary for route calculation (step S905).

  Next, the map distribution unit 171 distributes map data (distribution data 181) necessary for route calculation to the map update unit 111 (step S906).

  Next, the map update unit 111 performs a map data update process (step S907). In the map data update process, the update data 124 is updated with the latest received map data (delivery data 181). The map data update processing will be described later with reference to FIG.

  Next, the map updating unit 111 notifies the map reading unit 112 that the update of the map data necessary for the route calculation has been completed (update completion notification) (step S908).

  When the version acquired in step S903 is equal to or higher than the base version (that is, when the requested parcel has been updated), or when the completion of updating is notified from the map updating unit 111 in step S908, the map reading unit 112 Reads the update data 124 from the update data DB 123 (step S909).

  Next, the map reading unit 112 responds to the route calculation unit 114 with the read update data 124 (step S910).

  The route calculation unit 114 restarts the route calculation using the update data 124 passed from the map reading unit 112 (step S911).

  Thereafter, the navigation system 1 repeats the processing from step S901 to step S911 until the shortest route to the destination is calculated. Thereby, the route based on the latest map data is displayed.

  In the operation shown in FIG. 9, the map data (parcel) in a range necessary for executing the route calculation is sequentially updated (that is, the shortest route is not updated unless the data necessary for the route calculation is updated). The present invention is not limited to such a method. For example, the road data necessary for the route calculation is to be updated collectively for the whole country when the navigation device 10 is activated, and after the route calculation to the destination is executed, the road data along the route is executed in the same procedure as in FIG. The process of updating the background data and shape data of the above may be performed. By doing so, it is possible to determine the shortest route based on the latest map data, present it to the user, and then sequentially update the map data along the route.

  FIG. 10 is a diagram showing an example of a flowchart relating to the map data updating process in step S705 in FIG. 7, step S808 in FIG. 8, and step S907 in FIG.

  First, the map update unit 111 calculates a distance L between the center coordinates of the parcel requested to be updated and the center coordinates of the map (for example, the display area 270) displayed on the display unit 130 (step S1001).

  Next, the map updating unit 111 compares the distance L with the threshold M (Step S1002). Here, the threshold value M is a value for determining whether or not the parcel requested to be updated is being displayed on the display unit 130. When determining that the distance L is larger than the threshold M (that is, when the parcel requested to be updated is not displayed on the display unit 130), the map updating unit 111 shifts the processing to step S1003 and sets the distance L to the threshold M. If it is determined that the following is true (that is, if the parcel requested to be updated is displayed on the display unit 130), the process proceeds to step S1004.

  In step S1003, the map updating unit 111 executes the map updating process A, and ends the map data updating process. The map update processing A will be described later with reference to FIG.

  In step S1004, the map update unit 111 executes the map update processing B, and ends the map data update processing. The map update processing B will be described later with reference to FIG.

  FIG. 11 is a diagram illustrating an example of a flowchart relating to map update processing A executed in step S1003 of FIG.

  The map updating unit 111 first refers to the parcels included in the distribution data 181 received from the map distribution unit 171 (for example, one parcel in the level 2 hierarchy 260 and 16 parcels in the level 1 hierarchy 250). Then, the update data DB 123 is updated collectively (step S1101).

  This batch update process can be executed by, for example, the SQL statement 1110 described in FIG. Here, Table A corresponds to the update data DB 123 shown in FIG. 3, and Table B corresponds to the distribution data 181 shown in FIG. The meaning of the SQL statement 1110 is that the first row deletes all rows corresponding to the parcel ID included in the distribution data 181 from the update data DB 123, and the second row deletes all rows included in the distribution data 181. This is inserted into the update data DB 123. The method of updating is not limited to the method of deleting and adding, and may adopt a method of overwriting (for example, an UPDATE statement).

  Next, the map update unit 111 updates the version of the parcel stored in the version DB 122 (Step S1102).

  Next, the map update unit 111 notifies the map reading unit 112 of update completion information indicating that the update of the update data DB 123 has been completed (update completion notification) (step S1103), and ends the map update processing A.

  FIG. 12 is a diagram illustrating an example of a flowchart relating to map update processing B executed in step S1004 of FIG.

  First, the map update unit 111 sets “1” to the variable I (step S1201).

  Next, the map update unit 111 selects the unprocessed unprocessed closest to the center coordinates of the map (display area 270) displayed on the display unit 130 among the 16 parcels of the level 1 hierarchy 250 included in the distribution data 181. The parcel is selected as a parcel to be processed (level 1 parcel), and the update data DB 123 is updated for the parcel to be processed (step S1202).

  Next, the map updating unit 111 updates the version stored in the version DB 122 for the parcel of the level 1 hierarchy 250 (the parcel to be processed) updated in step S1201 (step S1203).

  Next, the map update unit 111 notifies the map reading unit 112 of update completion information indicating that the update of the parcel to be processed has been completed (update completion notification) (step S1204).

  Next, the map updating unit 111 adds “1” to the variable I (Step S1205).

  Next, the map updating unit 111 determines whether the variable I is a value larger than “16” (Step S1206). If the map update unit 111 determines that the variable I is equal to or less than “16”, the process returns to step S1202, and repeats the process. If it determines that the variable I is greater than “16”, the process proceeds to step S1207. .

  The map update unit 111 updates the update data DB 123 for one parcel of the level 260 (level 2 parcel) included in the distribution data 181 (step S1207).

  Next, the map update unit 111 updates the version stored in the version DB 122 with respect to the parcel of the level 2 hierarchy 260 updated in step S1206 (step S1208).

  Next, the map updating unit 111 notifies the map reading unit 112 of update completion information indicating that the updating of the parcels of the level 2 hierarchy 260 has been completed (update completion notification) (step S1209), and executes the map updating process B. finish.

  As described above, the map update processing A is normally executed in the background such as a route calculation, and the map update processing B is executed in the foreground such as when displaying the vicinity of a destination. Can be displayed.

  FIG. 13 is an operation for explaining the timing at which the map updating unit 111 and the map reading unit 112 refer to the update data DB 123 for the map updating process A shown in FIG. 11 and the map updating process B shown in FIG. It is a figure showing an example of a sequence.

  The operation sequence diagram 1310 is an operation sequence diagram relating to the map update processing A. One set of parcels (one parcel at the level 2 hierarchy 260 and 16 parcels at the level 1 hierarchy 250 and not used immediately for display) is shown in FIG. 4) shows an example of an operation sequence when updating ()). In the map update processing A, the time for updating one set of parcels after the map reading unit 112 issues a map update request for one set of parcels to the map updating unit 111 is time T (AW). In addition, when data of one necessary parcel is read from the update data DB 123, the time until reading of one parcel ends is time T (AR).

  Operation Sequence FIG. 1320 is an operation sequence diagram relating to the map update processing B, and shows an example of an operation sequence when updating one set of parcels used immediately for display. In the map update processing B, after the map reading unit 112 makes a map update request for one set of parcels to the map updating unit 111, the process from reading the data of one parcel required for display from the update data DB 123 to the end of reading is completed. The time is time T (BR). The time when the updating of one set of parcels ends is time T (BW).

  Here, when only the map update processing A is adopted in the navigation system 1, the time to complete the update of one set of parcels is time T (AW), and a plurality of updates or readings are performed until the update is completed. Is shorter than the time T (BW). Therefore, it is suitable for updating parcels that are not used immediately for display. However, when the updated map data is used immediately for display, the time until reading is completed is time T (AR), which is longer than the time T (BR) for updating and reading one parcel used for display. Become. On the other hand, when only the map update processing B is adopted, the result is opposite to that in the case of the map update processing A.

  In this regard, the present embodiment is configured such that when updating parcels not used for display immediately, map update processing A is performed, and when updating parcels used for display immediately, map update processing B is performed. ing. According to such a configuration, both the background processing and the foreground processing can be performed quickly.

  According to the present embodiment, it is possible to update map data while suppressing the effect on navigation performance.

(2) Second Embodiment A navigation system 2 according to the present embodiment will be described with reference to FIGS. About the structure similar to 1st Embodiment, the same code | symbol is used and the description is abbreviate | omitted suitably.

  This embodiment is different from the first embodiment in that the map updating unit 111 and the map reading unit 112 simultaneously access the same database in the navigation system 2 that updates the map data during the execution of the navigation process. Is reduced, and the drawing performance of the map while the map data is being updated is improved.

  The navigation system 2 of the present embodiment is basically the same as the navigation system 1 of the first embodiment, except that the configuration of the update data stored in the storage unit 120 of the navigation device 10 and the configuration of the map distribution server 20 The configuration of the distribution data stored in the storage unit 180, the processing in the map updating unit 111 of the navigation device 10, and the processing in the map reading unit 112 of the navigation device 10 are different from those of the first embodiment as described below. .

  FIG. 14 is a diagram illustrating an example of a configuration according to the navigation system 2.

  The storage unit 120 of the navigation device 10 stores a version DB 122 and update data 1404 including a background DB 1401, a road DB 1402, and a shape DB 1403. The update data 1404 will be described later with reference to FIG. Distribution data 1411 is stored in the storage unit 180 of the map distribution server 20. The distribution data 1411 will be described later with reference to FIG.

  FIG. 15 is a diagram illustrating an example of the update data 1404. The update data 1404 includes a version DB 122, a background DB 1401, a road DB 1402, and a shape DB 1403.

  The background DB 1401 is a database that stores background data of the distribution data 1411 acquired from the map distribution server 20. The background DB 1401 includes a parcel ID 1501 and background data 1502.

  The road DB 1402 is a database that stores road data of the distribution data 1411 acquired from the map distribution server 20. The road DB 1402 includes a parcel ID 1511 and road data 1512.

  The shape DB 1403 is a database that stores the shape data of the distribution data 1411 acquired from the map distribution server 20. The shape DB 1403 includes a parcel ID 1521 and shape data 1522.

  The background data 1502, road data 1512, and shape data 1522 are the same as the background data 220, road data 230, and shape data 240 of the map data 121 described with reference to FIG.

  FIG. 16 is a diagram illustrating an example of the distribution data 1411. As in the first embodiment, the distribution data 1411 is created in units of one parcel in the level 260 of the map data. The distribution data 1411 stores data of one parcel in the level 2 hierarchy 260 and data of 16 parcels in the level 1 hierarchy 250 corresponding to the parcel.

  Distribution data 1411 includes a database including parcel ID 1601 and background data 1602, a database including parcel ID 1603 and road data 1604, and a database including parcel ID 1605 and shape data 1606. Divided and created.

  Regarding the operation of the navigation system 2, the manner in which the navigation device 10 updates each parcel when calculating the route to the destination (FIG. 5) and the screen displayed on the display unit 130 of the navigation device 10 (FIG. 5). 6), the operation sequence of the map updating system (FIGS. 7, 8, and 9), and the flowchart of the map data updating process (FIG. 10) are the same as those in the first embodiment.

  FIG. 17 is a diagram illustrating an example of a flowchart related to map update processing A (step S1003) in map data update processing performed by the navigation system 2.

  In the map update processing A of the navigation system 2, the map update unit 111 firstly performs parcels included in the background data received from the map distribution unit 171 (for example, one parcel of the level 260 and a level 1 of the hierarchy 260). The background DB 1401 is updated collectively with reference to the 16 parcels 260 (step S1701). The process of updating all at once can be executed by the SQL statement 1110 described in FIG. 11 as in the first embodiment. Here, TableA corresponds to the background DB 1401 shown in FIG. 15, and TableB corresponds to the database storing the background data in the distribution data 1411 shown in FIG.

  Similarly, the map updating unit 111 refers to the parcels included in the road data received from the map distribution unit 171 (for example, one parcel in the level 2 hierarchy 260 and 16 parcels in the level 1 hierarchy 250). Then, the road DB 1402 is updated collectively (step S1702).

  Similarly, the map updating unit 111 refers to parcels included in the shape data received from the map distributing unit 171 (for example, one parcel in the level 2 hierarchy 260 and 16 parcels in the level 1 hierarchy 250). Then, the shape DB 1403 is updated collectively (step S1703).

  Next, the map updating unit 111 updates the parcel version stored in the version DB 122 (Step S1704).

  Next, the map update unit 111 notifies the map reading unit 112 of update completion information indicating that the update of the background DB 1401, the road DB 1402, and the shape DB 1403 has been completed (update completion notification) (step S1705), and the map update process Terminate A.

  FIG. 18 is a diagram illustrating an example of a flowchart relating to map update processing B (step S1004) in map data update processing performed by the navigation system 2.

  In the map updating process B of the navigation system 2, the map updating unit 111 first sets “1” to a variable I (step S1801).

  Next, from the background data included in the distribution data 1411, the map updating unit 111 determines the nearest coordinates of the center coordinates of the map (display area 270) displayed on the display unit 130 among the 16 parcels of the level 1 hierarchy 250. The parcel for processing is selected as a parcel to be processed (level 1 parcel), and the background DB 1401 is updated for the parcel to be processed (step S1802). At this time, the map updating unit 111 sets, for example, a background DB update flag that can identify whether or not the background DB 1401 has been updated before the update, and sets the background DB update flag to off after the update. Then, it is possible to determine whether or not the background DB 1401 is being updated.

  Similarly, the map updating unit 111 updates the road DB 1402 for the parcel to be processed (step S1803). At this time, the map updating unit 111 sets, for example, a road DB update flag that can identify whether or not the road DB 1402 has been updated before the update, and sets the road DB update flag to off after the update. Then, it is possible to determine whether or not the road DB 1402 is being updated.

  Similarly, the map updating unit 111 updates the shape DB 1403 for the parcel to be processed (step S1804). At this time, the map updating unit 111 sets, for example, a shape DB update flag that can identify whether or not the shape DB 1403 has been updated before the update, and sets the shape DB update flag to off after the update. Then, it is possible to determine whether or not the shape DB 1403 is being updated.

  Next, the map updating unit 111 updates the version stored in the version DB 122 for the parcel of the level 1 hierarchy 250 (the parcel to be processed) updated in steps S1802 to S1804 (step S1805).

  Next, the map update unit 111 notifies the map reading unit 112 of update completion information (update completion notification) indicating that the processing target parcel has been updated (step S1806).

  Next, the map updating unit 111 adds “1” to the variable I (Step S1807).

  Next, the map updating unit 111 determines whether or not the variable I is a value larger than “16” (Step S1808). If the map updating unit 111 determines that the variable I is not greater than “16”, the process returns to step S1802, and repeats the process. If it is determined that the variable I is greater than “16”, step S1809 is performed. Transfer processing to

  The map updating unit 111 updates the background DB 1401 for one parcel (level 2 parcel) of the level 260 of the background data (step S1809). At this time, for example, the map update unit 111 sets the background DB update flag to ON before the update, sets the background DB update flag to OFF after the update, and determines whether the background DB 1401 is being updated. enable.

  Similarly, the map update unit 111 updates the road DB 1402 for one parcel of the level 260 of the road data at the level 260 (step S1810). At this time, for example, the map update unit 111 sets the road DB update flag to ON before the update, sets the road DB update flag to OFF after the update, and determines whether the road DB 1402 is being updated. Make judgment possible.

  Similarly, the map update unit 111 updates the shape DB 1403 for one parcel of the level 260 of the shape data in the hierarchy 260 (step S1811). At this time, for example, the map update unit 111 sets the shape DB update flag to ON before updating, sets the shape DB update flag to OFF after update, and determines whether the shape DB 1403 is being updated. enable.

  Next, the map updating unit 111 updates the version stored in the version DB 122 for the parcel of the level 2 hierarchy 260 (level 2 parcel) updated in steps S1809 to S1811 (step S1812).

  Next, the map update unit 111 notifies the map reading unit 112 of update completion information indicating that the update of the level 2 parcel has been completed (update completion notification) (step S1813), and ends the map update process B.

  FIG. 19 is a diagram illustrating an example of a flowchart relating to a reading process executed by the map reading unit 112.

  The map reading unit 112 first determines whether or not the map updating unit 111 is updating the background DB 1401 (for example, whether or not the background DB flag is on) (step S1901). If the map reading unit 112 determines that the background DB 1401 is being updated, the process proceeds to step S1902. If it determines that the background DB 1401 is not being updated, the process proceeds to step S1905.

  In step S1902, the map reading unit 112 reads the requested parcel shape data from the shape DB 1403.

  Subsequently, the map reading unit 112 reads the road data of the requested parcel from the road DB 1402 (Step S1903).

  Next, the map reading unit 112 reads the requested parcel background data from the background DB 1401 (step S1904), and ends the reading process.

  In step S1905, the map reading unit 112 determines whether the map update unit 111 is updating the road DB 1402 (for example, whether the road DB flag is on). When determining that the road DB 1402 is not being updated, the map reading unit 112 shifts the processing to step S1906, and shifts the processing to step S1909 when determining that the road DB 1402 is being updated.

  In step S1906, the map reading unit 112 reads the requested parcel road data from the road DB 1402.

  Subsequently, the map reading unit 112 reads the requested parcel background data from the background DB 1401 (step S1907).

  Subsequently, the map reading unit 112 reads the requested parcel shape data from the shape DB 1403 (step S1908), and ends the reading process.

  In step S1909, the map reading unit 112 reads the requested parcel background data from the background DB 1401.

  Subsequently, the map reading unit 112 reads the requested parcel shape data from the shape DB 1403 (step S1910).

  Subsequently, the map reading unit 112 reads the requested parcel road data from the road DB 1402 (step S1911), and ends the reading process.

  The order of reading is not limited to the above. For example, when the background DB 1401 is being updated, a configuration in which reading of the background DB 1401 is performed later can be appropriately adopted. For example, after reading the road DB 1402, the shape DB 1403 may be read, and finally, the background DB 1401 may be read. Further, for example, when the road DB 1402 is being updated, a configuration in which reading of the road DB 1402 is performed later can be appropriately adopted. For example, after the shape DB 1403 is read, the background DB 1401 may be read, and finally the road DB 1402 may be read. Further, for example, when the shape DB 1403 is being updated, a configuration in which the shape DB 1403 is read later can be appropriately adopted. For example, the background DB 1401 may be read, then the road DB 1402 may be read, and finally, the shape DB 1403 may be read.

  According to the above-described processing, since the data is read from the map data in the database that is not being updated, the time during which the database that is being updated is locked and the map data cannot be read can be reduced, and the navigation performance during the update of the map can be improved.

  FIG. 20 shows that the map updating unit 111 and the map reading unit 112 refer to the update data 1404 for the map updating process A shown in FIG. 17, the map updating process B shown in FIG. 18, and the reading process shown in FIG. FIG. 9 is a diagram showing an example of an operation sequence for explaining the timing of the operation.

  In FIG. 20, when the map update unit 111 updates parcels “P1-16”, “P1-12”, “P1-15”, “P1-11”,. The case where the update of the parcel “P1-16” has been completed and the update completion information has been notified to the map reading unit 112 will be described as an example.

  In such a case, the map update unit 111 updates the background DB 1401 of the parcel “P1-12” (Step S1802). At this time, since the map reading unit 112 has received the notification of the update completion information of the parcel “P1-16”, the map reading unit 112 starts reading processing of the parcel “P1-16”, and the background DB 1401 is being updated. Is read (step S1902), the road DB 1402 is read (step S1903), and finally, the background DB 1401 is read (step S1904). Note that the map update unit 111 updates the road DB 1402 of the parcel “P1-12” when the update of the background DB 1401 of the parcel “P1-12” is completed and the reading of the shape DB 1403 is completed (step S1803). Subsequently, the shape DB 1403 of the parcel “P1-12” is updated (step S1804).

  As described above, when the map updating unit 111 updates the background DB 1401, the map reading unit 112 reads the map data of the parcel “P1-16” from the road DB 1402 or the shape DB 1403 different from the background DB 1401, and By reading the map data of the parcel "P1-16", the time T for reading the map data of the parcel "P1-16" can be reduced.

  According to the present embodiment, the time required for the map updating unit 111 and the map reading unit 112 to simultaneously access the same database can be reduced, and the latest map data can be displayed at high speed.

(3) Other Embodiments In the above-described embodiment, a case has been described in which the present invention is applied to the navigation system 1 mounted on a vehicle such as an automobile, but the present invention is not limited to this. , A mobile object such as a robot or a drone, or a movable medium such as a smartphone or a tablet terminal, and can be widely applied to various other navigation systems, navigation devices, and navigation methods.

  Further, in the above-described embodiment, the case where the process of step S701 is performed when the navigation device 10 is activated has been described. However, the present invention is not limited to this. The process of step S701 may be performed after the map of the old map data of the data 121 or the update data 124 is displayed.

  In the above-described embodiment, FIG. 12 describes the case where the level 250 is displayed. However, the present invention is not limited to this. The processing of steps S1207 to S1206 may be performed after the processing of steps S1207 to S1209 is performed.

  In the above-described embodiment, in FIGS. 12 and 18, among 16 parcels of the level 1 hierarchy 250, the unprocessed unprocessed closest to the center coordinate of the map (display area 270) displayed on the display unit 130 is displayed. Although the case where the parcels are updated one by one has been described, the present invention is not limited to this, and one or a plurality of parcels to be displayed among 16 parcels of the level 250 is updated collectively, and then the remaining parcels are updated. May be updated collectively.

  In the above-described embodiment, the case where the map data 121 and the update data 124 and 1404 are separately stored has been described. However, the present invention is not limited to this, and the map data 121 and the update data 124 and 1404 are stored separately. May be stored as integrated map data (for example, a database). In this case, the map data 121 may be updated with the update data 124 and 1404 (the data may be deleted and added, or the data may be overwritten). The update data 124 and 1404 may be added to the data 121 in an identifiable manner, or another configuration may be adopted.

  Further, in the above-described embodiment, various data are described using the XX table and the XX database for convenience of description, but the data structure is not limited and may be expressed as XX information or the like.

  In the above description, information such as a program, a table, and a file for realizing each function is stored in a memory, a hard disk, a storage device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD. Can be put on.

  Further, the above-described configuration may be appropriately changed, rearranged, combined, or omitted without departing from the scope of the present invention.

  As described above, the navigation device (for example, the navigation device 10) includes a storage unit (for example, the storage unit 120) that stores the map information (for example, the update data 124 and 1404) for each section constituting the map, and the storage unit. A map updating unit (for example, the control unit 110 and the map updating unit 111) that updates the map information stored in the storage unit, and a map reading unit (for example, the control unit 110 that reads the map information stored in the storage unit). A map reading unit 112), and a navigation unit (for example, a control unit 110, a navigation unit 115) for performing navigation based on the map information read by the map reading unit. (For example, one set of parcels, parcel “P2-1” in level 260, and level 1) When updating the map information of the parcels “P1-1” to “P1-16” in the hierarchy 250, the navigation state performed by the navigation unit (at the start of navigation, at the time of setting a destination, at the time of calculating a route, , The number of sections to be updated at one time from among the plurality of sections is changed in accordance with whether or not the section is a display target section, a hierarchy of levels at which the plurality of sections are displayed, a user's sucrose operation, and the like. It is characterized by the following.

  According to the above configuration, by changing the number of sections to be updated at one time, the time required for one update can be adjusted. For example, if the number of sections to be updated is shortened when necessary for display, , The influence on the time required for display can be suppressed.

  The navigation unit performs navigation for displaying a map on a display unit based on the map information read by the map reading unit, and the map updating unit performs a target section (for example, display) by the navigation unit. It is desirable to change the number of sections to be updated at once from among the plurality of sections based on the area 270).

  According to the above configuration, the number of sections to be updated at a time can be changed between the section related to the foreground and the section related to the background. For example, after updating the map information of the section related to the foreground, By updating the map information of the sections, it is possible to improve the performance of navigation when updating the map.

  The map updating unit is configured to execute a parcel relating to a display area indicating a region displayed by the navigation unit (for example, when the level 250 of the level 1 is displayed, the parcel relating to the display area 270 is a parcel “P1- 11, “P1-12”, “P1-15”, “P1-16”,..., When the level 260 is displayed, the parcel relating to the display area 270 is the parcel “P2-1”. , "P2-2", "P2-5", and "P2-6") are not included in the plurality of sections (the determination method includes a distance L between the update point and the display point). And the threshold M may be compared, a method of determining the overlap between the display area 270 and the plurality of sections, or another method may be used.) Update map information for all at once If a first update process (for example, a map update process A shown in FIG. 11 or FIG. 17) is performed and it is determined that the predetermined section is included in the plurality of sections, the map information of the plurality of sections is updated. It is desirable to perform a second update process (for example, a map update process B shown in FIG. 12 or FIG. 18) for updating each section.

  According to the above configuration, for example, by updating the map information of the section related to the background at one time, the time related to the update is reduced, and by updating the map information of the section related to the foreground, the time related to the display is reduced. Since it can be shortened, navigation performance can be improved.

  In the second update process, the map update unit updates the map information of a section near the center of the display area out of the plurality of sections, and confirms that the update is completed each time the map information is updated. It is preferable that the update completion information is notified to the map reading unit, and the map reading unit reads the update completion map information when the update completion information is received from the map update unit.

  According to the above configuration, since the update is performed from the map information of the section related to the display area, for example, the time required for display can be reduced. Further, since the map information is updated from the map information of the section near the display area, even when the user performs the scroll operation, for example, the map information of the section required after the scroll can be quickly displayed.

  The plurality of sections are a plurality of first sections (for example, parcels “P1-1” to “P1-16”) belonging to a first layer (for example, level 250) for displaying a detailed map. ) And one second section corresponding to the plurality of first sections belonging to a second level (for example, level 2 level 260) for displaying a map wider than the first level. Parcel "P2-1"), and in the second updating process, when the predetermined section is a section belonging to the first hierarchy, the map updating section performs the plurality of first sections. It is desirable to update the map information of the one second section after updating the map information of.

  According to the above configuration, the configuration is updated from the map information of the first section relating to the display area, so that, for example, the time required for display can be reduced.

  The map updating unit compares a distance between the center coordinates of the display area and the center coordinates of the one second section with a threshold value, and determines whether the predetermined section is included in the plurality of sections. It is desirable to determine

  When a destination is input, the map reading unit requests the map updating unit for map information of a plurality of sections including the input destination section, and the map updating unit sends the map information from the map reading unit. Based on the request, map information of a plurality of sections including the section of the destination is acquired from the map distribution server, and the second update processing is performed using the acquired map information. In the second update processing, The map information of the section of the destination is updated, update completion information indicating that the update is completed is notified to the map reading unit, and the map reading unit receives the update completion information from the map updating unit, The map information of the section of the destination is read, and the read map information is notified to the navigation unit. When the navigation unit receives the map information from the map reading unit, the navigation unit displays the map information on the display unit. That Masui.

  When the destination is input, it is necessary to update and display the map of the destination. In this regard, according to the above configuration, the map information of the section of the destination required for the display is preferentially updated, so that the map of the destination can be quickly displayed.

  The map reading unit, when the destination is input, before requesting the map updating unit for map information of a plurality of sections including the input destination section, reads the destination section from the storage unit. The non-updated map information that is the map information is read, and the read non-updated map information is notified to the navigation unit.When the navigation unit receives the non-updated map information from the map reading unit, the navigation unit outputs the non-updated map information. When the updated map information, which is displayed on the display unit and is the map information of the section of the destination stored in the map distribution server from the map reading unit, is received, the unupdated map information displayed on the display unit is displayed. Is desirably switched to the updated map information.

  According to the above configuration, the old map can be displayed until the latest map of the destination is displayed.

  When calculating the route from the current position to the destination, the navigation unit requests the map reading unit for the map information of the section used for the calculation of the route, and the map reading unit based on the request from the map reading unit. Requesting the map information of the section used for the calculation of the route to the map updating unit, and the map updating unit transmits the map information of the section used for the calculation of the route from the map distribution server based on the request from the map reading unit. The map information is acquired, the first update process is performed using the acquired map information, and the map reading unit updates the map information of the section used for calculating the route updated by the map update unit with the navigation unit. It is preferable that the navigation unit calculates the route based on the map information when the navigation unit receives the map information from the map reading unit.

  According to the above configuration, since the section used for calculating the route from the current location to the destination is a section that is not displayed, by updating all at once, for example, the time required for updating can be reduced, and the time required for calculating the route can be reduced. Can be reduced.

  The map information of each section stored in the storage unit is divided and stored in a plurality of databases (for example, a background DB 1401, a road DB 1402, and a shape DB 1403), and the map reading unit is updated by the map updating unit. When reading the map information of the updated section, when the map information of the section stored in one of the plurality of databases is updated, the map information of the plurality of databases different from the one database is read. It is preferable to read the updated map information of the sections stored in another database.

  In the above configuration, for example, the collision performance between reading (reading) and updating (writing) of one database can be avoided, so that the performance of navigation can be improved.

  It is desirable that the map reading unit reads the updated map information of the updated section stored in the one database last.

  According to the above configuration, for example, when the time required for updating one database is longer than the time required for reading the remaining databases, the waiting time for reading one database can be minimized.

  The map updating unit, when determining that the predetermined section related to the display area indicating the area displayed by the navigation unit is not included in the plurality of sections, collectively stores the map information of the plurality of sections for each database. Performing a first update process for updating in step (a), and determining that the predetermined section is included in the plurality of sections, updating the map information of the plurality of sections for each database and for each section. It is desirable to perform the update process.

  According to the above configuration, for example, by updating the map information of the section relating to the background once for each database, the map information of the section relating to the foreground is updated for each database while reducing the time required for updating. By reading the updated sections from the database that has not been updated, the time required for display can be further reduced, so that the performance of navigation can be further improved.

  According to the above configuration, the map information can be appropriately updated.

  1 navigation system, 10 navigation device, 20 map distribution server.

Claims (15)

A navigation device,
A storage unit for storing map information for each section constituting the map,
A map update unit that updates map information stored in the storage unit;
A map reading unit that reads map information stored in the storage unit;
A navigation unit that performs navigation based on the map information read by the map reading unit,
With
When updating the map information of a plurality of sections stored in the storage unit, the map update unit may update the map information of the plurality of sections to be updated at one time according to a state of navigation performed by the navigation unit. Change the number,
A navigation device characterized by the above-mentioned. The navigation unit performs navigation for displaying a map on a display unit based on the map information read by the map reading unit,
The map updating unit changes a number of sections to be updated at once among the plurality of sections based on a target section displayed by the navigation unit.
The navigation device according to claim 1, wherein: The map update unit updates the map information of the plurality of sections collectively when determining that a predetermined section related to a display area indicating an area displayed by the navigation unit is not included in the plurality of sections. Performing a first update process, and performing a second update process of updating map information of the plurality of sections for each section when determining that the predetermined section is included in the plurality of sections;
The navigation device according to claim 2, wherein: In the second update process, the map update unit updates the map information of a section of the plurality of sections that is closer to the center of the display area, and that the update is completed each time the map information is updated. Notifying the map reading unit of the indicated update completion information,
Upon receiving the update completion information from the map update unit, the map reading unit reads the map information of the updated section,
The navigation device according to claim 3, wherein: The plurality of sections belong to a plurality of first sections belonging to a first layer for displaying a detailed map, and the plurality of sections belong to a second layer for displaying a map wider than the first layer. One second section corresponding to the plurality of first sections,
In the second update process, when the predetermined section is a section belonging to the first hierarchy, the map updating section updates map information of the plurality of first sections and then updates the one Update the map information of the second section,
The navigation device according to claim 3, wherein: The map updating unit compares a distance between a center coordinate of the display area and a center coordinate of the one second section and a threshold value, and determines whether the predetermined section is included in the plurality of sections. Judge,
The navigation device according to claim 5, wherein: When a destination is input, the map reading unit requests the map updating unit for map information of a plurality of sections including the input destination section,
The map updating unit acquires map information of a plurality of sections including the destination section from a map distribution server based on a request from the map reading unit, and performs the second update using the acquired map information. Performing a process, in the second update process, updates the map information of the section of the destination, and notifies the map reading unit of update completion information indicating that the update has been completed;
The map reading unit, upon receiving the update completion information from the map updating unit, reads the map information of the section of the destination, notifies the read map information to the navigation unit,
The navigation unit, upon receiving map information from the map reading unit, displays the map information on the display unit,
The navigation device according to claim 3, wherein: The map reading unit, when a destination is input, before requesting the map updating unit for map information of a plurality of sections including the input destination section, from the storage unit, Read unupdated map information that is map information, notify the read unupdated map information to the navigation unit,
The navigation unit, when receiving the non-updated map information from the map reading unit, displays the non-updated map information on the display unit, and stores the destination division stored in the map distribution server from the map reading unit. Upon receiving the updated map information that is the map information, switching the non-updated map information displayed on the display unit to the updated map information,
The navigation device according to claim 7, wherein: The navigation unit, when calculating the route from the current location to the destination, requests the map reading unit the map information of the section used for the route calculation,
The map reading unit, based on a request from the map reading unit, requests the map updating unit for map information of a section used for calculating the route,
The map updating unit acquires map information of a section used for calculating the route from a map distribution server based on a request from the map reading unit, and performs the first update process using the acquired map information. ,
The map reading unit notifies the navigation unit of map information of a section used for calculating the route updated by the map updating unit,
The navigation unit, upon receiving the map information from the map reading unit, calculates the route based on the map information,
The navigation device according to claim 3, wherein: The map information of each section stored in the storage unit is divided and stored in a plurality of databases,
When reading the map information of the updated section updated by the map updating section, the map reading section updates the map information of the section stored in one of the plurality of databases. Reading map information of the updated section stored in another database of the plurality of databases different from the one database,
The navigation device according to claim 1, wherein: The map reading unit finally reads map information of the updated section stored in the one database,
The navigation device according to claim 10, wherein: The map update unit collects the map information of the plurality of sections for each database when determining that the predetermined section related to the display area indicating the area displayed by the navigation unit is not included in the plurality of sections. Performing a first update process of updating the plurality of sections, and when it is determined that the predetermined section is included in the plurality of sections, a second step of updating map information of the plurality of sections for each database and for each section. Update process of
The navigation device according to claim 10, wherein: A navigation method in a navigation system including a storage unit that stores map information for each section constituting a map,
A first step in which a map update unit updates map information stored in the storage unit;
A second step in which the map reading unit reads the map information stored in the storage unit;
A third step in which a navigation unit performs navigation based on the map information read by the map reading unit;
With
When updating the map information of a plurality of sections stored in the storage unit, the map update unit may update the map information of the plurality of sections to be updated at one time according to a state of navigation performed by the navigation unit. Change the number,
A navigation method characterized in that: The navigation unit performs navigation for displaying a map on a display unit based on the map information read by the map reading unit,
The map updating unit changes a number of sections to be updated at once among the plurality of sections based on a target section displayed by the navigation unit.
14. The navigation method according to claim 13, wherein: The map information of each section stored in the storage unit is divided and stored in a plurality of databases,
When reading the map information of the updated section updated by the map updating section, the map reading section updates the map information of the section stored in one of the plurality of databases. Reading map information of the updated section stored in another database of the plurality of databases different from the one database,
14. The navigation method according to claim 13, wherein:

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