JP7164984B2 - Navigation device and navigation method - Google Patents

Description

The present invention relates to a navigation device and a navigation method, and is suitable for application 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 by referring to map data stored in a storage. Since the guidance information presented by the car navigation system depends on the recorded map data, it is desirable to use as new map data as possible. Therefore, technology is being developed to update map data in the background while the car navigation system is running.

In recent years, when it is determined by the determination means that the update data should be applied to the execution map data, the navigation processing is performed with reference to the update data, while the determination means determines that the update data is not applied to the execution map data. A map data processing device, comprising: reference means for performing navigation processing by referring to non-updated map data in the event of an update, and updating means for updating the map data using update data. is disclosed (see Patent Document 1).

WO2010/116513

The technique described in Patent Literature 1 does not take into consideration the deterioration of navigation performance due to map updating in parallel with navigation processing.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and is intended to propose a navigation apparatus or the like capable of updating map information while suppressing the influence on navigation performance.

In order to solve such problems, the present invention provides, for example, a navigation device comprising: a storage unit for storing map information for each section constituting a map; and a map updating unit for updating the map information stored in the storage unit. a map reading unit that reads map information stored in the storage unit; and a navigation unit that performs navigation based on the map information read by the map reading unit, wherein the map update unit is configured to: When updating map information of a plurality of sections stored in the storage unit, the number of sections to be updated at one time among the plurality of sections is changed according to the state of navigation performed by the navigation unit. did.

According to the above configuration, by changing the number of sections to be updated at one time among the plurality of sections to be updated according to the navigation state, it is possible to adjust the time required for one update. In such a case, by reducing the number of sections to be updated so that the update time is shortened, the influence on the time required for display can be suppressed.

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

It is a figure showing an example of composition concerning a navigation system by a 1st embodiment. It is a figure which shows an example of the map data by 1st Embodiment. It is a figure which shows an example of the update data by 1st Embodiment. 4 is a diagram showing an example of distribution data according to the first embodiment; FIG. It is a figure which shows an example of a parcel update aspect by 1st Embodiment. It is a figure which shows an example of the display mode by 1st Embodiment. 4 is a diagram showing an example of an operation sequence according to the first embodiment; FIG. 4 is a diagram showing an example of an operation sequence according to the first embodiment; FIG. 4 is a diagram showing an example of an operation sequence according to the first embodiment; FIG. FIG. 7 is a diagram showing an example of a flowchart relating to map data update processing according to the first embodiment; FIG. 7 is a diagram showing an example of a flowchart relating to map update processing A according to the first embodiment; FIG. 7 is a diagram showing an example of a flowchart relating to map update processing B according to the first embodiment; 4 is a diagram showing an example of an operation sequence according to the first embodiment; FIG. FIG. 10 is a diagram showing an example of the configuration of a navigation system according to a second embodiment; FIG. FIG. 10 is a diagram showing an example of update data according to the second embodiment; FIG. FIG. 10 is a diagram showing an example of distribution data according to the second embodiment; FIG. FIG. 10 is a diagram showing an example of a flowchart relating to map update processing A according to the second embodiment; FIG. 12 is a diagram showing an example of a flowchart relating to map update processing B according to the second embodiment; FIG. 10 is a diagram showing an example of a flowchart relating to read processing according to the second embodiment; FIG. 10 is a diagram showing an example of an operation sequence according to the second embodiment; FIG.

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

(1) First Embodiment In FIG. 1, 1 generally indicates a navigation system according to a first embodiment. The navigation system 1 updates the map data during navigation processing. The navigation system 1 switches the map update process according to the state of the navigation device 10 when the map data is updated, thereby improving the map drawing performance during the update of the map data.

FIG. 1 is a diagram showing an example of the configuration of a navigation system 1. As shown in FIG. A 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, and uses the latest map data distributed from the map distribution server 20 to calculate a travel route to a destination, and , especially a map of the surroundings of the vehicle, and displayed on the display unit 130 . In the present embodiment, a case in which 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. However, since the map distribution server 20 performs the same processing for any navigation device 10, the case where one navigation device 10 is connected will be described as an example in the present embodiment.

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

The control unit 110 executes a series of processes related to navigation. Storage unit 120 stores map data 121 and update data 124 including version DB 122 and update data DB 123 . The display unit 130 displays a navigation screen (for example, a map screen) to present it to the user. The operation unit 140 receives an input such as a destination by the 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). The functions of the navigation device 10 are realized by executing the 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 configured integrally 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, etc.) may be implemented as dedicated hardware, or may be executed by the control unit 110. It may be configured to be realized as a software module. Also, part of the functions of the navigation device 10 may be implemented by another computer that can communicate with the navigation device 10 .

Here, as functions of the navigation device 10, the control unit 110 includes a map update 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 the user. A navigation unit 115 that performs navigation is realized. The map update unit 111 acquires the distribution data 181 from the map distribution server 20 and updates the update data 124 . Map reading unit 112 reads map data 121 and update data 124 from storage unit 120 and provides them to map drawing unit 113 and route calculation unit 114 . The map drawing unit 113 draws a map 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 vehicle to the destination as one process of the navigation unit 115 .

The map distribution server 20 includes a control section 170 , a storage section 180 and a communication section 190 . The control unit 170 performs a series of processes for distributing map data. The storage unit 180 stores 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). The CPU develops a program stored in the ROM into the RAM and executes the program, thereby realizing functions to be described later. Note that the functions of the map distribution server 20 (for example, the map distribution unit 171) may be configured to be implemented as dedicated hardware, or may be configured to be implemented as software modules executed by the control unit 170. FIG. Also, part of the functions of the map distribution server 20 may be implemented 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 the distribution data 181 to the navigation device 10 .

Note that 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 showing an example of the map data 121 stored in the navigation device 10. As shown in FIG.

Here, map data for car navigation is generally composed of a plurality of sections (hereinafter referred to as parcels) separated by small rectangles. Moreover, 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 structure, for example, only expressways are recorded in the upper layer, and all roads including narrow streets are recorded in the lower layer, thereby speeding up the map display and route calculation according to the scale. making it possible.

The map data 121 includes parcel ID 210 , background data 220 , road data 230 and shape data 240 . The parcel ID 210 is an ID (identification) that uniquely identifies each parcel. The background data 220 is data that stores the shapes of buildings, parks, etc. 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 that stores the shape of roads to be drawn on the map screen.

In this embodiment, the map data 121 is composed of two layers, a level 1 layer 250 and a level 2 layer 260, and one parcel in the level 2 layer 260 corresponds to 16 layers in the level 1 layer 250. A case corresponding to parcels will be explained as an example. Further, in the present embodiment, the map update process is changed according to the parcel related 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" of level 1) to draw each parcel. (for example, the display map of the parcel “P1-16” of the hierarchy 250 of level 1) is created and displayed on the display unit 130. FIG.

In FIG. 2, the display area 270 is shown in the level 1 hierarchy 250 and the level 2 hierarchy 260, but what is displayed on the display unit 130 is basically the level 1 hierarchy 250. It is either a map or a map of level 2 hierarchy 260 . However, the map of the level 1 hierarchy 250 and the map of the level 2 hierarchy 260 may be displayed at the same time on the upper and lower sides of the screen of the display unit 130, for example.

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

Version DB122 is a database which stores the version of each parcel. Information on the parcel ID 301 and the version 302 are stored in the version DB 122 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 parcel ID 311 , background data 312 , road data 313 and shape data 314 . Background data 312, road data 313, and shape data 314 are the same as background data 220, road data 230, and shape data 240 of map data 121 described with reference to FIG.

FIG. 4 is a diagram showing an example of distribution data 181 stored in the map distribution server 20. As shown in FIG. The distribution data 181 is created in units of one parcel of the level 2 layer 260 of the map data. The distribution data 181 stores data of one parcel of the level 2 hierarchy 260 and data of 16 parcels of 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 . Background data 402, road data 403, and shape data 404 are the same as background data 220, road data 230, and shape data 240 of map data 121 described with reference to FIG.

The operation flow of the navigation system 1 will be described below.

FIG. 5 is a diagram (an example of a parcel update mode 500) illustrating how parcels are processed (for example, updated) when the navigation device 10 calculates a route to a destination.

Parcel update aspects 510 , 520 , 530 , 540 represent multiple parcels of level 2 hierarchy 260 . In the parcel update modes 510, 520, 530, and 540, parcels with patterns mean unprocessed parcels (unupdated parcels), and parcels without patterns mean processed parcels (updated parcels). parcel).

Home 511 indicates the position of the home set by the user. In the initial state, none of the parcels have been updated (parcel update mode 510). Next, when the navigation device 10 is activated, the navigation system 1 updates 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 a plurality of parcels 542 along the route 541 (parcel update mode 540).

Thus, the navigation system 1 always updates the parcels referred to by the navigation process to the latest data (latest version parcels).

In addition, when the own vehicle approaches an unupdated parcel (for example, parcel 544) in the traveling direction from an updated parcel (for example, parcel 543), even if the own vehicle deviates from the route and travels, it is possible to reroute. , may be configured to update an unupdated parcel (for example, parcel 544) of the direction of travel of the host vehicle.

FIG. 6 is a view showing an example of a screen displayed on the display unit 130 of the navigation device 10 when the map (update data 124) is most recently processed as shown in FIG. ).

A screen 610 shows a state (initial state) in which a map around the home is initialized. A screen 620 shows how the latest map of the neighborhood of the home is displayed by processing the parcels of the neighborhood of the home, like the parcel update mode 520 in FIG.

A screen 630 shows a list of destination candidates displayed when the user inputs the name of the destination. On the screen 630, a list of destination candidates is displayed on the right side, and a map of the vicinity of the destination (a plurality of parcels including the destination) is displayed on the left side. As for the map of the vicinity of the destination, the old map is displayed immediately after the destination is selected because the processing has not been completed, but the latest map is displayed as soon as the processing of the vicinity of the destination is completed.

A screen 640 shows the state after the destination is determined and the latest map around the destination is displayed. A screen 650 shows the state immediately after the route to the destination is decided and the navigation is started. A screen 660 shows the situation when the vehicle reaches the vicinity of the destination.

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

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

After the navigation device 10 is activated, the map updating 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, base version) that enables identification of the presence or absence of new map data (step S702). Note that the base version indicates the version of the entire map data 121 and update data 124 .

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 normal navigation processing without doing anything. When there is new map data (when the base version possessed by the navigation device 10 does not match the base version possessed by the map distribution server 20), the map updating unit 111 sends the map distributing unit 171 the latest map data around the home. Map data is requested (step S703).

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

Next, the map update unit 111 performs map data update processing (step S705). In the map data update process, the update data 124 is updated with the received latest map data (delivery data 181) around the home. Note that the map data update process will be described later using FIG. 10 and the like.

Next, the map update unit 111 upgrades the base versions of the map data 121 and update data 124 (step S706).

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

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

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 acquired version and the base version, and if the base version is larger (that is, if the parcels around the requested destination have not been updated), then step S803 to step The processing up to S809 is executed.

Note that if the map reading unit 112 acquires the version of the layer 250 of level 1 in step S802, it takes time to compare, so it is preferable to acquire the version of the layer 260 of level 2. In this way, by comparing versions in higher layers, it is possible to quickly finish the process of confirming whether or not the requested map data is the latest.

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

Next, the map reading unit 112 responds with the read old map data to the map drawing unit 113 (step S804). The map drawing unit 113 displays the map data (old map data) around the destination on the display unit 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 the map data (distribution data 181) around the destination to the map update unit 111 (step S807).

Next, the map update unit 111 performs map data update processing (step S808). In the map data update process, the update data 124 is updated with the received latest map data (delivery data 181) around the destination. Note that the map data update process will be described later using FIG. 10 and the like.

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

If the version of the parcel acquired in step S802 is equal to or higher than the base version (that is, if the requested parcel has already 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 with the read update data 124 to the map drawing unit 113 (step S811). Note that, when the map drawing unit 113 receives the map data necessary for display, the map drawing unit 113 displays a map of the vicinity of the destination on the display unit 130 .

As described above, the display unit 130 displays a map (latest map) of the vicinity of the destination.

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

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

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

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 and the base version, and if the base version is larger (that is, if the requested parcel has not been updated), the processing from step S904 to step S908 is performed. Execute the process. In addition, as described above, the map reading unit 112 preferably acquires and compares the version of the level 2 layer 260 .

The map reading unit 112 first requests the map updating unit 111 to update map data necessary for 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 map data update processing (step S907). In the map data update process, the update data 124 is updated with the received latest map data (delivery data 181). Note that the map data update process will be described later using FIG. 10 and the like.

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

If the version acquired in step S903 is equal to or higher than the base version (that is, if the requested parcel has been updated), or if the map update unit 111 notifies the update completion 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 with the read update data 124 to the route calculating unit 114 (step S910).

The route calculation unit 114 resumes 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. As a result, the route based on the latest map data is displayed.

In the operation shown in FIG. 9, the map data (parcels) in the range necessary for route calculation are sequentially updated (i.e., the shortest route cannot be obtained unless the update of the data required for route calculation is completed). not determined), but the invention is not limited to such methods. For example, the road data required for route calculation is updated nationwide when the navigation device 10 is activated, and after executing the route calculation to the destination, the data along the route is calculated in the same procedure as shown in FIG. , the background data and shape data may be updated. By doing so, it is possible to determine the shortest route based on the latest map data and 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 map data update processing in step S705 of FIG. 7, step S808 of FIG. 8, and step S907 of FIG.

The map updating unit 111 first calculates the distance L between the central coordinates of the parcel requested to be updated and the central 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 and the threshold value 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 . If the map updating unit 111 determines that the distance L is greater than the threshold M (that is, if the parcel requested to be updated is not displayed on the display unit 130), the process proceeds to step S1003, and the distance L exceeds the threshold M If it is determined to be the following (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 update unit 111 executes map update processing A, and terminates the map data update processing. Note that the map update process A will be described later with reference to FIG. 11 .

In step S1004, the map update unit 111 executes map update processing B, and terminates the map data update processing. Note that the map update process B will be described later with reference to FIG. 12 .

FIG. 11 is a diagram showing 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 parcels included in the distribution data 181 received from the map distribution unit 171 (for example, one parcel in the level 2 layer 260 and 16 parcels in the level 1 layer 250). Then, the update data DB 123 is collectively updated (step S1101).

This batch update process can be executed by, for example, the SQL statement 1110 shown in FIG. Here, TableA corresponds to the update data DB 123 shown in FIG. 3, and TableB corresponds to the distribution data 181 shown in FIG. The meaning of the SQL statement 1110 is that the first line deletes all the lines corresponding to the parcel ID included in the distribution data 181 from the update data DB 123, the second line deletes all the lines included in the distribution data 181, It is inserted into the update data DB 123 . Note that the update method is not limited to the method of deleting and adding, but a method of overwriting (for example, an UPDATE statement) may be employed.

Next, the map updating unit 111 updates the parcel version stored in the version DB 122 (step S1102).

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

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

The map update unit 111 first sets the variable I to "1" (step S1201).

Next, the map update unit 111 updates the unprocessed parcel 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 layer 250 included in the distribution data 181. A 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 (processing target parcel) of the level 1 layer 250 updated in step S1201 (step S1203).

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

Next, the map update unit 111 adds "1" to the variable I (step S1205).

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

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

Next, the map updating unit 111 updates the version stored in the version DB 122 for the parcels of the level 2 layer 260 updated in step S1206 (step S1208).

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

In this way, normally, the map update process A is executed in the background such as route calculation, and the map update process B is executed in the foreground such as when displaying the vicinity of the destination. can be displayed on

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 in relation to the map update process A shown in FIG. 11 and the map update process B shown in FIG. It is a figure which shows an example of a sequence.

An operation sequence diagram 1310 is an operation sequence diagram for map update processing A. A set of parcels not immediately used for display (one parcel in the level 2 hierarchy 260 and 16 parcels in the level 1 hierarchy 250). ) is shown below. In the map update process A, after the map reading unit 112 requests the map updating unit 111 to update a set of parcels, the time required to update the set of parcels is time T (AW). In addition, temporarily, when the data of one required parcel are read from update data DB123, the time until reading of one parcel will be completed will be time T (AR).

An operation sequence diagram 1320 is an operation sequence diagram relating to map update processing B, and shows an example of an operation sequence when updating a set of parcels to be immediately used for display. In the map update process B, after the map reading unit 112 requests the map updating unit 111 to update the map for one set of parcels, the process until the reading of one parcel data required for display from the update data DB 123 is completed. The time becomes time T(BR). The time when one set of parcels is updated is time T (BW).

Here, when only the map update process A is adopted in the navigation system 1, the time to complete the update of one set of parcels is time T (AW). is shorter than the time T (BW) for performing Therefore, it is suitable for updating parcels that are not immediately used for display. However, if the updated map data is immediately used for display, the time to finish reading is time T(AR), which is longer than the time T(BR) to update and read one parcel used for display. Become. On the other hand, if only the map update process B is adopted, the result will be opposite to the case of the map update process A.

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

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

(2) Second Embodiment A navigation system 2 of this embodiment will be described with reference to FIGS. 14 to 20. FIG. The same reference numerals are used for the same configuration as in the first embodiment, and the description thereof is omitted as appropriate.

As in the first embodiment, in the navigation system 2 that updates map data during navigation processing, the map updating unit 111 and the map reading unit 112 simultaneously access the same database. It reduces the time to become a map and improves the drawing performance of the map while the map data is being updated.

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 structure 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 in the first embodiment as described below. .

FIG. 14 is a diagram showing an example of the configuration of the navigation system 2. As shown in FIG.

Storage unit 120 of navigation device 10 stores version DB 122 and update data 1404 including background DB 1401 , road DB 1402 and shape DB 1403 . Note that 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 . Note that the distribution data 1411 will be described later with reference to FIG. 16 .

FIG. 15 is a diagram showing an example of the update data 1404. As shown in FIG. Update data 1404 includes version DB 122 , background DB 1401 , road DB 1402 and shape DB 1403 .

Background DB 1401 is a database that stores background data of distribution data 1411 acquired from map distribution server 20 . Background DB1401 is comprised including parcel ID1501 and the background data 1502. FIG.

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 parcel ID 1511 and road data 1512 .

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

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

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

The distribution data 1411 consists of 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. created separately.

As for the operation of the navigation system 2, 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 update system (FIGS. 7, 8, and 9), and the map data update process flowchart (FIG. 10) are the same as those in the first embodiment.

FIG. 17 is a diagram showing an example of a flowchart relating to the map update process A (step S1003) in the map data update process performed by the navigation system 2. As shown in FIG.

In the map update process A of the navigation system 2, the map update unit 111 first updates the parcels included in the background data received from the map distribution unit 171 (for example, one parcel in the level 2 layer 260 and the level 1 layer 260 16 parcels), and updates the background DB 1401 collectively (step S1701). Batch update processing can be executed by the SQL statement 1110 shown 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 on the level 2 layer 260 and 16 parcels on the level 1 layer 250). Then, the road DB 1402 is collectively updated (step S1702).

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

Next, the map update 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 background DB 1401, the road DB 1402, and the shape DB 1403 have been updated (step S1705), and performs map update processing. End A.

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

In the map update process B of the navigation system 2, the map update unit 111 first sets the variable I to "1" (step S1801).

Next, the map updating unit 111 selects the closest uncoordinated map (display area 270) displayed on the display unit 130 from the background data included in the distribution data 1411 to the central coordinates of the 16 parcels of the layer 250 of level 1. The parcel to be processed is selected as the 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, for example, sets on a background DB update flag that can identify whether or not the background DB 1401 is being updated before the update, and sets the background DB update flag to off after the update. 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 update unit 111, for example, sets on a road DB update flag that can identify whether the road DB 1402 is being updated before updating, and sets the road DB update flag to off after updating. to determine whether 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, for example, the map updating unit 111 sets on a shape DB update flag that can identify whether or not the shape DB 1403 is being updated before the update, and sets the shape DB update flag to off after the update. Then, it can be determined 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 (processing target parcel) of the level 1 layer 250 updated in steps S1802 to S1804 (step S1805).

Next, the map updating unit 111 notifies the map reading unit 112 of update completion information (update completion notification) indicating that the update of the parcel to be processed has been completed (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 has a value greater than "16" (step S1808). If the map update unit 111 determines that the variable I is not greater than "16", it returns to step S1802 to repeat the process. to process.

The map updating unit 111 updates the background DB 1401 for one parcel (level 2 parcel) of the level 2 layer 260 of the background data (step S1809). At this time, the map updating unit 111, for example, 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 or not the background DB 1401 is being updated. to enable.

Similarly, the map updating unit 111 updates the road DB 1402 for one parcel in the level 2 layer 260 of the road data (step S1810). At this time, the map update unit 111, for example, sets the road DB update flag to ON before updating, and sets the road DB update flag to OFF after the update to check whether the road DB 1402 is being updated. make it determinable.

Similarly, the map updating unit 111 updates the shape DB 1403 for one parcel in the level 2 layer 260 of the shape data (step S1811). At this time, the map update unit 111, for example, sets the shape DB update flag to ON before the update, sets the shape DB update flag to OFF after the update, and determines whether or not the shape DB 1403 is being updated. to enable.

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

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

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

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 moves to step S1902, and if it determines that the background DB 1401 is not being updated, the process moves to step S1905.

In step S<b>1902 , the map reading unit 112 reads shape data of the requested parcel 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).

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

In step S1905, the map reading unit 112 determines whether the map updating unit 111 is updating the road DB 1402 (for example, whether the road DB flag is on). If the map reading unit 112 determines that the road DB 1402 is not being updated, the process moves to step S1906, and if it determines that the road DB 1402 is being updated, the process moves to step S1909.

In step S<b>1906 , the map reading unit 112 reads road data of the requested parcel from the road DB 1402 .

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

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

In step S<b>1909 , the map reading unit 112 reads the background data of the requested parcel from the background DB 1401 .

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

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

Note that the order of reading is not limited to the content described above. For example, when the background DB 1401 is being updated, a configuration in which the reading of the background DB 1401 is performed later can be appropriately employed. For example, after reading the road DB 1402, the shape DB 1403 may be read, and finally the background DB 1401 may be read. Also, for example, when the road DB 1402 is being updated, a configuration in which the road DB 1402 is read later can be appropriately employed. For example, after reading the shape DB 1403, 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, after reading the background DB 1401, the road DB 1402 may be read, and finally the shape DB 1403 may be read.

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

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. 10 is a diagram showing an example of an operation sequence for explaining the timing of the operation;

In FIG. 20, when the map updating unit 111 updates parcels "P1-16", "P1-12", "P1-15", "P1-11", . , and the parcel “P1-16” have been updated, and the map reading unit 112 has been notified of the update completion information.

In such a case, the map updating unit 111 updates the background DB 1401 of the parcel "P1-12" (step S1802). At this time, the map reading unit 112 receives the notification of the update completion information of the parcel “P1-16”, so it starts reading processing of the parcel “P1-16”. (step S1902), then the road DB 1402 is read (step S1903), and finally the background DB 1401 is read (step S1904). Note that, 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, the map update unit 111 updates the road DB 1402 of the parcel "P1-12" (step S1803). ), and then update the shape DB 1403 of the parcel “P1-12” (step S1804).

Thus, when the map updating unit 111 is updating 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 reads the map data from the background DB 1401. 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 shortened.

According to this embodiment, it is possible to reduce the time required for map updating unit 111 and map reading unit 112 to access the same database at the same time, and to display the latest map data at high speed.

(3) Other Embodiments In the above-described embodiment, the case where the present invention is applied to the navigation system 1 mounted on a vehicle such as an automobile was described, but the present invention is not limited to this. , mobile objects such as robots and drones, mobile media such as smartphones and tablet terminals, etc., and can be widely applied to various other navigation systems, navigation devices, and navigation methods.

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, but the present invention is not limited to this, and when the navigation device 10 is activated, the map 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 hierarchy 250 of level 1 is displayed, but the present invention is not limited to this, and when the hierarchy 260 of level 2 is displayed, step After performing the processing of steps S1207 to S1209, the processing of steps S1201 to S1206 may be performed.

In the above-described embodiment, in FIGS. 12 and 18, the unprocessed parcel closest to the central coordinates of the map (display area 270) displayed on the display unit 130 among the 16 parcels of the level 1 hierarchy 250 Although the case where the parcels are updated one by one has been described, the present invention is not limited to this, and after updating one or more parcels to be displayed among the 16 parcels of the hierarchy 250 of level 1 at once, the remaining parcels may be updated collectively.

In the above-described embodiment, the map data 121 and the update data 124, 1404 are separately stored. However, the present invention is not limited to this. 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 (which may be deleted and added, or may be overwritten). A configuration in which the update data 124 and 1404 are added to the data 121 in an identifiable manner may be employed, or another configuration may be employed.

In the above-described embodiment, for convenience of explanation, XX tables and XX databases were used to describe various types of data, but the data structure is not limited and may be expressed as XX information or the like.

In the above description, information such as programs, tables, and files that implement each function are stored in memory, hard disks, SSD (Solid State Drives), and other storage devices, or IC cards, SD cards, DVDs, and other recording media. can be placed in

Moreover, the above-described configurations may be appropriately changed, rearranged, combined, or omitted within 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 map information (for example, the update data 124, 1404) for each section constituting a map, and the storage unit a map update unit (for example, control unit 110, map update unit 111) that updates map information stored in the a map reading unit 112) and a navigation unit (for example, the control unit 110, the navigation unit 115) that performs navigation based on the map information read by the map reading unit; (eg, a set of parcels, level 2 hierarchy 260 parcel "P2-1" and level 1 hierarchy 250 parcels "P1-1" through "P1-16") stored in When updating the map information, the state of the navigation performed by the navigation unit (at the start of navigation, at the time of setting the destination, at the time of route calculation, whether or not a plurality of sections is a section to be displayed, whether a plurality of sections The number of sections to be updated at once among the plurality of sections is changed according to the hierarchy of displayed levels, user's scroll operation, etc.).

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. can reduce the impact on the time required for display.

The navigation unit performs navigation for displaying a map on the display unit based on the map information read by the map reading unit. It is desirable to change the number of partitions to be updated at once among the plurality of partitions based on the partitions related to the area 270).

According to the above configuration, the number of blocks to be updated at once can be changed between the blocks related to the foreground and the blocks related to the background. Updating the map information for the parcels can improve navigation performance when the map is being updated.

The map update unit updates a predetermined section related to the display area indicating the area displayed by the navigation unit (for example, when the layer 250 of level 1 is displayed, the parcel related to the display area 270 is the parcel "P1- 11", "P1-12", "P1-15", "P1-16", . ”, “P2-2”, “P2-5”, and “P2-6”) are not included in the plurality of sections (as a determination method, the distance L between the update point and the display point and a threshold value M, a method of determining overlap between the display area 270 and the plurality of sections, or other methods.), the plurality of sections A first update process (for example, map update process A shown in FIG. 11 or FIG. 17) is performed to collectively update the map information of, and it is determined that the predetermined section is included in the plurality of sections, It is desirable to perform a second update process (for example, map update process B shown in FIG. 12 or FIG. 18) for updating the map information of the plurality of sections for each section.

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

In the second updating process, the map updating unit updates the map information of a section near the center of the display area among the plurality of sections, and notifies that the update is completed each time the map information is updated. It is preferable that the map reading section is notified of the update completion information shown in the map reading section, and upon receiving the update completion information from the map updating section, the map reading section reads the map information of the updated section.

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

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

According to the above configuration, since the map information of the first section related to the display area is updated, for example, the time required for display can be shortened.

The map update unit compares the 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 or not the predetermined section is included in the plurality of sections. should be determined.

When a destination is input, the map reading section requests map information of a plurality of sections including the section of the input destination from the map updating section. Based on the request, map information for a plurality of sections including the destination section is acquired from the map distribution server, the acquired map information is used to perform the second update process, and in the second update process, updating the map information of the destination section, notifying the map reading unit of update completion information indicating that the update has been completed, and receiving the update completion information from the map updating unit; The map information of the section of the destination is read, the read map information is notified to the navigation section, and the navigation section, upon receiving the map information from the map reading section, displays the map information on the display section. is desirable.

When a destination is entered, the map of the destination needs to be updated and displayed. In this respect, according to the above configuration, the map information of the section of the destination required for display is preferentially updated, so that the map of the destination can be displayed quickly.

When the destination is input, the map reading unit reads the destination blocks from the storage unit before requesting the map updating unit for map information of a plurality of blocks including the input destination block. It reads unupdated map information, which is map information, notifies the read unupdated map information to the navigation section, and upon receiving the unupdated map information from the map reading section, the navigation section reads the unupdated map information. When the update map information, which is the map information of the destination section displayed on the display unit and stored in the map distribution server, is received from the map reading unit, the unupdated map information displayed on the display unit. 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 the navigation unit calculates a route from the current location to the destination, the navigation unit requests the map reading unit for map information of the section used for route calculation, and the map reading unit receives the request from the map reading unit. based on the request from the map reading unit, the map updating unit receives from the map distribution server the map information of the sections to be used for calculating the route. Map information is acquired, and the acquired map information is used to perform the first update process. and the navigation unit, upon receiving the map information from the map reading unit, preferably calculates the route based on the map information.

According to the above configuration, the sections used to calculate the route from the current location to the destination are sections that are not displayed. can be reduced.

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

In the above configuration, navigation performance can be improved by, for example, avoiding collisions between reading (reading) and updating (writing) of one database.

Preferably, the map reading unit finally reads the updated map information of the section stored in the one database.

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

When determining that a predetermined section related to a display area indicating an area displayed by the navigation section is not included in the plurality of sections, the map update section collectively updates map information of the plurality of sections for each database. When it is determined that the predetermined section is included in the plurality of sections, the map information of the plurality of sections is updated for each database and for each section. should be updated.

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

According to the above configuration, it is possible to appropriately update the map information.

1...Navigation system, 10...Navigation device, 20...Map distribution server.

Claims (9)

A navigation device,
a storage unit that stores map information for each section that constitutes a map;
a map updating unit that updates map information stored in the storage unit;
a map reading unit for reading 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
The navigation unit performs navigation to display a map on the display unit based on the map information read by the map reading unit,
When updating the map information of a plurality of sections stored in the storage section, the map update section updates a section among the plurality of sections at once based on the target section displayed by the navigation section. change the number of
The map update unit collectively updates the map information of the plurality of sections when determining that a predetermined section related to the display area indicating the area displayed by the navigation section is not included in the plurality of sections. When it is determined that the predetermined section is included in the plurality of sections by performing a first update process, performing a second update process of updating the map information of the plurality of sections for each section;
A navigation device characterized by: In the second updating process, the map updating unit updates the map information of a section near the center of the display area among the plurality of sections, and notifies that the update is completed each time the map information is updated. notifying the map reading unit of update completion information indicated by
The map reading unit, upon receiving update completion information from the map updating unit, reads map information of the updated section.
The navigation device according to claim 1 , characterized by: The plurality of sections include a plurality of first sections belonging to a first layer for displaying a detailed map, and a plurality of sections belonging to a second layer for displaying a map wider than the first layer. and one second compartment corresponding to a plurality of first compartments,
In the second updating process, if the predetermined section belongs to the first layer, the map updating section updates the map information of the plurality of first sections, and then updates the map information of the first section. Update the map information for the 2nd parcel,
The navigation device according to claim 1 , characterized by: The map update unit compares the distance between the center coordinates of the display area and the center coordinates of the one second section with a threshold value to determine whether the predetermined section is included in the plurality of sections. determine the
4. The navigation device according to claim 3 , characterized in that: When a destination is input, the map reading unit requests map information of a plurality of sections including the input destination section from the map updating unit,
The map updating unit acquires map information of a plurality of sections including the section of the destination from the map distribution server based on a request from the map reading unit, and performs the second update using the acquired map information. in the second update process, updating the map information of the destination section, and notifying the map reading unit of update completion information indicating that the update has been completed;
When the map reading unit receives the update completion information from the map updating unit, the map reading unit reads the map information of the destination section, and notifies the navigation unit of the read map information;
When receiving the map information from the map reading unit, the navigation unit displays the map information on the display unit.
The navigation device according to claim 1 , characterized by: When a destination is input, the map reading unit reads the destination blocks from the storage unit before requesting the map updating unit for map information of a plurality of blocks including the input destination block. reading unupdated map information, which is map information, and notifying the navigation unit of the read unupdated map information;
When the navigation unit receives the unupdated map information from the map reading unit, the navigation unit displays the unupdated map information on the display unit. When updated map information, which is map information, is received, the unupdated map information displayed on the display unit is switched to the updated map information.
6. A navigation device according to claim 5 , characterized in that: When calculating the route from the current location to the destination, the navigation unit requests the map reading unit for map information of the section used for calculating the route,
based on the request from the map reading unit, the map reading unit requests the map updating unit for map information of the section used for calculating the route;
The map updating unit acquires map information of the section used for calculating the route from the map distribution server based on a request from the map reading unit, and performs the first updating process using the acquired map information. ,
The map reading unit notifies the navigation unit of the map information of the section used for calculating the route updated by the map updating unit;
When the navigation unit receives the map information from the map reading unit, the navigation unit calculates the route based on the map information.
The navigation device according to claim 1 , characterized by: When determining that a predetermined section related to a display area indicating an area displayed by the navigation section is not included in the plurality of sections, the map update section collectively updates the map information of the plurality of sections for each database. When it is determined that the predetermined section is included in the plurality of sections, the map information of the plurality of sections is updated for each database and for each section. update the
The navigation device according to claim 1 , characterized by: A navigation method in a navigation system comprising 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 the navigation unit performs navigation based on the map information read by the map reading unit;
with
The navigation unit performs navigation to display a map on the display unit based on the map information read by the map reading unit,
When updating the map information of a plurality of sections stored in the storage section, the map update section updates a section among the plurality of sections at once based on the target section displayed by the navigation section. change the number of
The map update unit collectively updates the map information of the plurality of sections when determining that a predetermined section related to the display area indicating the area displayed by the navigation section is not included in the plurality of sections. When it is determined that the predetermined section is included in the plurality of sections by performing a first update process, performing a second update process of updating the map information of the plurality of sections for each section;
A navigation method characterized by:

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