A Method of Map Vector Tile Caching

Abstract

The present application provides a method for caching map vector tiles, including: calculating the resolution range of map data; linearly dividing the map at each resolution into blocks, and determining the block sequence number of each map data at a certain resolution ;Remove redundant data; Determine the data that needs to be cached in each tile under all resolutions, and pack all the data into map vector tile cache data. The map vector tile caching method provided by the present invention can perform good rendering at any map scale, and is smaller in volume than image caching and more flexible in rendering, thereby ensuring better user experience for users.

Description

technical field [0001] The invention relates to the technical field of geographic information, in particular to a method for caching map vector tiles. Background technique [0002] At present, a large number of Internet maps use tile caches to optimize map display. In general, tile caches refer to dividing vector map data into fixed-size blocks and pre-rendering them into pictures for use on various terminals (such as browser, mobile device) app. [0003] The purpose of the above method is to improve the system performance. The rendering calculations that originally needed to be performed dynamically are processed on the server side first, and the map display in the user's terminal is transformed into a scene that only needs to be displayed with pictures. While improving the display efficiency, It also reduces the difficulty of implementing maps in various terminals. [0004] However, the current technology generates pictures in a limited scale, which brings some disadvant...

AI Technical Summary

Problems solved by technology

[0009] The present invention provides a method for caching map vector tiles, which generates a tile cache based on blocks and stores vector data, which not only solves the problem that users can only view maps at several scales, but also solves the problem that if the text is fixed at On the map, the text will also be rotated when the map is rotated, causing the problem that the user cannot recognize it, and the generated cache is smaller than the image cache, and the rendering is more flexible, so as to ensure that the user has a better user experience

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