File organization structure of off-line map and multi-thread tile downloading and reading method

Abstract

The invention belongs to the field of off-line maps, and particularly relates to a file organization structure of an off-line map and a multi-thread tile downloading and reading method. In order to solve the problems that index data, tile data and a multi-level map are inconvenient to store in a single file in the prior art, so that map distribution is inconvenient, map copying and moving are very inconvenient, and tiles are easy to lose, the following scheme is provided. The scheme comprises a file header part, a tile index part and a tile storage part, the file header part comprises creation time, a map name, map source information, a map coordinate range, a coordinate system type, a tile library start-stop hierarchy number and a data format type of a tile image; and the file header is an entrance of the GIS software system for loading off-line map tile data. According to the invention, the index data, the tile data and the multi-level map can be conveniently stored in a single file, so that the map can be conveniently distributed, the map is very convenient to copy and move, and the problem of tile loss is avoided.

Description

technical field [0001] The invention relates to the technical field of offline maps, in particular to a file organization structure of offline maps and a method for downloading and reading multi-threaded tiles. Background technique [0002] With the development of mobile Internet technology, most APP software functions are closely related to map services. The file storage structure, download and reading methods of offline maps are one of the basic functions provided by mobile APP. How to optimize offline map files The storage structure, downloading and reading methods have practical significance. The offline map downloading and saving on the mobile terminal provides an effective solution for the map application and fast tile loading in the offline environment, which greatly improves the user experience; offline map The loading and accessing methods are suitable for people working in the field; the off-the-ground map involves three aspects: the structure of the offline map fi...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the inconvenience of storing index data, tile data and multi-level maps in a single file in the prior art, resulting in inconvenient map distribution, and very inconvenient map copying and moving, and the existence of tiles. The shortcomings of the loss, and the proposed offline map file organization structure, multi-threaded tile download and reading method

Images