Map rendering method and map rendering device

Abstract

The invention discloses a map rendering method and a map rendering device. The method comprises the steps that: vector slices contained in a to-be-rendered map are grouped, so that slice groups contained in the to-be-rendered map are obtained, and serve as to-be-rendered slice groups; a vector slice file corresponding to vector slices contained in the to-be-rendered map is obtained, wherein the vector slice file comprises layer information; and for each to-be-rendered slice group, the following operations are executed: for the same layer of each vector slice in the to-be-rendered slice group,a rendering engine is called once to render the same layer of each vector slice. According to the map rendering method and map rendering device of the invention, the same layer of each vector slice inthe single slice group is used as rendering granularity during rendering, so that the switching frequency of a shader program, the calling frequency of the rendering engine and system overhead are reduced.

Description

technical field [0001] The present invention relates to the field of Web geographic information system (WebGIS, web geographic information system), in particular, to a map rendering method and a map rendering device. Background technique [0002] During the development of WebGIS, the map has gradually developed from two-dimensional to two-dimensional and three-dimensional integration, and the rendering technology has changed from rendering based on Scalable Vector Graphics (SVG, Scalable Vector Graphics) to a cross-platform network graphics library (WebGL, Web Graphics). Library) technology, basemap data is developed from raster tiles to vector tiles. Among them, the raster slice is to cut the vector data in the form of a pyramid, and output them into pictures of a fixed size, usually 256*256 in size, which are cached on the server side for the browser client to call; the vector slice is to divide the vector data into a pyramid The output is a descriptive file of vector dat...

AI Technical Summary

Problems solved by technology

However, in addition to the PC side, maps are becoming more and more popular in large-screen applications, and the resolution of large screens ranges from 4K pixels, 8K pixels, to 11520*4320 pixels, or even higher. The vectors that need to be displayed within the screen range The number of slices is as high as thousands or more. At this time, the traditional rendering method takes a long time to render the entire vector slice map, and the phenomenon of stuttering often occurs

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