Airborne digital map local data increment updating method and device

Abstract

The invention belongs to the field of airborne graphic image processing, and relates to an airborne digital map local data increment updating method and device. The method is based on the thought of local updating and a layer coverage mechanism, and a geographic data increment packet is adopted to correspond to a local area of a digital map with grids as units. Both the original geographic data packet and the geographic data incremental packet of the digital map comprise corresponding geographic data index files and geographic data files, and the geographic data files store grid data files andvector data files in layers by taking grids as units, the geographic data index file comprises a grid position and a relative path of the corresponding geographic data file in the storage space, andthe geographic data increment packet is consistent with the original geographic data packet in terms of a spatial reference system, a scale and a layering mode. On the basis of ensuring data consistency, map updating efficiency can be remarkably improved, and operation is easy and convenient.

Description

technical field [0001] The invention belongs to the field of airborne graphics and image processing, and relates to an airborne digital map data update method. Background technique [0002] The airborne digital map application has the characteristics of short reconstruction time and high real-time performance. The map data used is a static cache, that is, the map is cut into tiles in advance according to the established tile pyramid scheme, and then organized through a specific file index directory structure for digital map software to read. In order to reduce storage space occupation and improve data transmission speed, map layers are often pre-fused together to generate a cache. The map data is cached as a large number of map tiles, resulting in a slow data update speed, which virtually increases aircraft maintenance costs. [0003] It can be seen that the traditional method adopts the global update method, which can ensure data consistency, but the update process needs ...

AI Technical Summary

Problems solved by technology

Map data is cached as a large number of map tiles, resulting in slow data update speed, which virtually increases aircraft maintenance costs

[0003] It can be seen that the traditional method adopts the global update method, which can ensure data consistency, but the update process needs to copy a large number of small map tile files, and the update efficiency is not high

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