JPH0394377A - Map file updating system - Google Patents

Abstract

PURPOSE:To reutilize an original map data area in the updating processing of the map file area by comparing the capacity of map data requested at its updating with that of the original map data in the map file area. CONSTITUTION:The map file updating system is constituted of a map data input part 1, a map data control file retrieving part 2, a map data capacity comparing part 3, a map file area updating part 4, a map control file updating part 5, a map data control file 6, and a map file area 7. The capacity of map data requested at its updating is compared with that of the map data stored in a map data control record, and at the time of deciding that the capacity of the accepted map data is not larger than that of the recorded map data, the original map data in the map file area is rewritten by the accepted map data. Thereby, the original map data area in the map file storage area can be reutilized, so that it is unnecessary to expand a new storage area in each updating.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a map file updating method, and particularly to a map file updating method for partially updating a map file in which map data is stored on a data storage medium.

[Conventional technology]

Conventionally, in this type of map file update method, when an update request is made, the original map data of the map data to be updated is deleted from the map file, and the map data is updated after the last map data in the map file storage area. I am trying to write map data.

[Problem to be solved by the invention]

The conventional map file update method described above deletes the original map data of the map data to be updated when an update request is made.
Since the map data to be updated is written after the current map file storage area, the original map data area of the map file storage area is not used and is wasted, and the new storage area increases each time it is updated. It has drawbacks.

[Means to solve the problem]

The map file update method of the present invention is a map file update method that partially updates map data in a map file area stored on a storage medium, and includes a map data input means that receives a request for map data to be updated; a map data management file search means for retrieving a map data management record stored in a map data management file from a map data search key; a capacity of map data recorded in the retrieved map data management record; a comparison means for comparing the capacity of the map data that has been received, and a comparison means that accepts the original map data in the map file area when the comparison means determines that the capacity of the accepted map data is not larger than the capacity of the recorded map data; and map file area updating means for rewriting map data to map data.

〔Example〕 Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a layout diagram of an embodiment of the present invention, showing a map data input unit 1 for inputting map data of an update request, and a map data management record searched from a map data management file 6 based on the contents of the update request. a map data management file search unit 2 that performs the search, and a map data amount comparison unit 3 that compares the amount of map data in the update request with the amount of map data in the map data management record.
, a map file area update unit 4 that updates the map file area 7 according to the result of the map data amount comparison unit 3; a map data management file update unit 5 that updates the map data management file 6 according to the update result; It is composed of a map data management file 6 and a map file area 7.

FIG. 2 is a record format diagram of the map data of the update request inputted into the map data input section 1 of FIG. 1, which includes a search key 21, map image data 22, and a capacity 23 of this data 22.

FIG. 3 is a record format diagram of the map data management file 6 shown in FIG.
2 and a record address 33 indicating the beginning and end of this map image data on the map file area 7.

FIG. 4 is a flowchart of map updating in the embodiment shown in FIG. 1, and the updating process shown in FIG. 1 will be explained below with reference to FIG. First, when the map data of the update request is input to the map data input section 1 (step (2)), the map data management file search section 2 uses the search key 21 for this map data as a key to manage the corresponding map data in the map data management file 6. A record is searched (step ■), and if the search key 21 of the update request matches the search key 31 on the map data management file 6 (step ■>), the map data of the update request is regarded as updated map data. , the capacity 23 of the map data of the update request is compared with the capacity 32 of the map data management record (step ■).As a result, the capacity 23 is compared with the capacity 32 of the map data management record.
3 is smaller than or equal to the capacity 32, the original map data in the map file area 7 is replaced with the map data for which the update request was made (step ■), and the storage is performed based on the capacity 23 of the map data for which the update request was made. The start and end of the record address on the medium are calculated, and the capacity 32 and record address 3 are added to the map data management record of the map data management file 6.
3. (Step ■) On the other hand, if no match is found between the search key 21 of the update request and the search key 31 on the map management file 6 in Step ■, the map data of the update request is the newly added map data. This map data is additionally written after the last map data in the map file area 7, and the original map data is deleted (step ■). Also in this case, the process of step (2) is performed. Furthermore, when the capacity 23 is larger than the capacity 32 in step (2), that is, when the capacity of the map data of the update request is larger than the original map data, steps (2) and (2) are performed. [Effects of the Invention] As explained above, in the map file area update process, the present invention compares the size of the map data requested for update with the original map data size of the map file area. , the original map data area can be reused, and the map file area can be used efficiently.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a record format diagram of the map data of the update request in FIG. 1, and FIG. 3 is a record format diagram of the map data management file in FIG. 1.
FIG. 4 is a flowchart of update processing in the embodiment shown in FIG. 1... Map data input section, 2... Map data management file search section, 3... Map data amount comparison section, 4...
Map file area update unit, 5... Map management file update unit, 6... Map data management file, 7... Map file area.

Claims (1)

[Claims] In a map file update method that partially updates map data in a map file area stored on a storage medium, a map data input means receives a request for map data to be updated, and the map data is retrieved from a search key of the received map data. A map data management file search means that retrieves a map data management record stored in a management file, and compares the capacity of the map data recorded in the retrieved map data management record with the capacity of the accepted map data. a comparison means, and a map file area for rewriting the original map data in the map file area with the accepted map data when the comparison means determines that the capacity of the received map data is not larger than the capacity of the recorded map data. 1. A map file update method comprising: update means.