https://github.com/jingsam/vector-tile-spec/blob/master/2.1/README_zh.md
https://github.com/mapbox/vector-tile-spec/tree/master/2.1
https://github.com/mapbox/awesome-vector-tiles
矢量切片
原文：https://www.cnblogs.com/gispathfinder/p/9535615.html
