Map tile generating method and device

Abstract

The invention provides a map tile generating method and device. The generating method includes determining identification information of areas where tiles required to be generated belong according to the space range information of the tiles, determining whether space data of the areas corresponding to the identification information is stored in a stored file by searching an index database built in advance based on the identification information, storing the identification information of the areas with the space data in the index database, not storing the identification information of the areas without the space data, generating the tiles based on the space data if a user determines that the space data of the areas corresponding to the identification information are stored in the stored file through searching, otherwise, quitting generating the tiles. Therefore, the empty tile areas without data are determined before tile rendering, the areas without the data are avoided in the tile generation process, the tiles are only generated in the areas with the data, an effect of greatly shortening tile generation time is achieved, and a network map quick updating mechanism is formed.

Description

technical field [0001] The invention relates to the technical field of map generation, in particular to a method and device for generating map tiles. Background technique [0002] Map tile technology is to render the spatial data of the whole world into pictures of different resolutions, and divide them into blocks, starting from the upper left corner of the data map picture including the spatial range of the whole world, from left to right, from top to bottom Cut down to square map tiles of the same size (usually 256x256 pixels). [0003] Usually, the scale level at which the spatial data of the whole world is scaled within a tile range is called level 0, which is the minimum resolution level. The next scale level is level 1, and the resolution is twice that of level 0, that is, 2*2 tiles represent the whole world. By analogy, 0-N level map tiles are formed. Currently, the web maps provided by each website can provide map tiles of levels 00-18. [0004] At present, ther...

AI Technical Summary

Problems solved by technology

[0008] Due to the generation of a large number of empty tiles that do not require rendering and other processing, it has become a bottleneck that hinders the improvement of tile production efficiency, and restricts the rapid update of network map tiles

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