Data difference update method and system

Abstract

The invention discloses a data difference update method and a system. The method comprises the following steps: referring to a blocking method and a block number thereof of existing formatted map data, extracting changed map data from master data, and formatting the changed map data; storing different map data items of the map data, such as block number, route calculation, road name and background, in different documents; and based on the block number, updating the existing map data items with the changed map data items. The invention can update the map data with smaller data update amount in real time.

Description

Technical field [0001] The invention relates to a database technology, in particular to a method and system for data differential updating. Background technique [0002] In modern electronic maps, hierarchical road networks and data difference technology are mostly used. The hierarchical road network is to layer roads according to different levels, and display the road network of the corresponding level for different needs. The data difference technology only updates the changed data, and keeps the unchanged data unchanged. [0003] In order to be able to implement map instructions, different data needs to be scheduled, when a large amount of data needs to be read, there is also a corresponding buffering method, proper management of different data, reasonable organization of different data, and arrangement of each data in a certain order Therefore, the map data includes data scheduling, data buffering methods, data management, data analysis methods, data content organization, dat...

AI Technical Summary

Problems solved by technology

Since the storage space of the block data is fixed, it cannot be adjusted according to the size of the subsequent stored block data. Therefore, the block data that becomes larger after the update can only be stored at the end of the entire file. Finally, The amount of data will continue to increase as the amount of updated data is updated

[0027] At the same time, in the prior art, although the route calculation (Route Calculate: RC) data adopted by Kiwi adopts the block method, the RC calculation data has too many block areas, and there are gaps between adjacent blocks. Over layer layer, there is an association relationship between the same block layer and the upper and lower block layers

When the map data is updated, the relationship between all the block layers associated with it will change accordingly, so the amount of data updated each time will be large

[0028] In addition, because Kiwi data has a Link ID attribute, and Link ID runs through all route levels, and requires that the same-named paths be continuous, therefore, if a certain road segment needs to be added or deleted, the entire Link ID attribute will be destroyed, so that the data maintenance caused inconvenience

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