A method for making a vector tile map

Abstract

The invention discloses a vector tile map making method. The method comprises the steps of firstly determining the total number of tiles, a knowledge base and a symbol library corresponding to the tile map as well as a spatial resolution of each output tile according to a range of a vector map to be subjected to tile processing, the width and height of each output tile and a map scale of each output tile; secondly calculating a geographical range of one tile according to top left corner coordinates of the vector map, the geographical width and height of the tile and row and column numbers of the tile, and performing cutting and processing on vector map elements by taking the tile range as a cutting frame; and finally performing element processing and processed element storage on the vector map according to the geographical range, as the cutting frame, of the tile. According to the method, geographical elements in the generated vector tile map can be interactively accessed and the correctness and continuity of overall symbol expression of the geographical elements of the tiles can be kept.

Description

technical field [0001] The invention belongs to the technical field of map drawing, in particular to a method for making a vector tile map. Background technique [0002] With the rapid development of wireless communication, computer technology and geospatial information technology, network electronic map has become an indispensable part of people's daily life and work activities. From simple location queries to various navigation and positioning services and the latest street view maps and indoor maps, electronic maps are affecting and improving people's lives all the time. [0003] Due to the relatively large amount of map data, taking into account network transmission efficiency and user experience, electronic maps such as Google Maps, YahooMaps, and Virtual Earth took the lead in using map "tile technology". , in the form of pictures, it is divided into tile sets that are spatially related and adjacent to cover the entire mapping area. According to the range of the map b...

AI Technical Summary

Problems solved by technology

This kind of vector data model, which takes the whole element as a unit, cannot be used for vector tile maps, because after the elements are divided by "tiles", the segmented geographical feature maps are symbolized independently, and the symbol graphics are in the "tiles". Visual incoherence such as graphic conflicts or breaks occurs at the stitching, and graphic conflicts will destroy the relative spatial distribution characteristics, making the expression effect of map information poor, resulting in cognitive obstacles for readers, making the map very inconvenient to read and use

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