GIS离线解决方案参考网址part1

https://www.zhihu.com/question/68519807/answer/266763506 纯内网的离线地图有哪些解决方案
openlayers A high-performance, feature-packed library for all your mapping needs
Leaflet
https://blog.csdn.net/youngkingyj/article/details/23365849 OpenStreetMap/Google/百度/Bing瓦片地图服务(TMS)
https://blog.csdn.net/ahence/article/details/44057681 瓦片地图原理
https://blog.csdn.net/wudiazu/article/details/76597294 瓦片计算公式原理
https://www.jianshu.com/p/9eca1bc8a12d OpenLayers 3 自定义坐标系
https://blog.csdn.net/qq_25552049/article/details/79453414 加载离线高德地图
http://www.bigemap.com/home/help/one/id/106.html 也可以直接搜索使用openlayer加载离线地图的解决方法
https://www.cnblogs.com/marblemm/p/7222202.html 各种各样的瓦片下载器