Mapbox加载天地图CGCS2000矢量瓦片地图服务

1.背景

最近在做天地图的项目，要基于MapBox添加CGCS2000矢量切片数据，但是 Mapbox 只支持web 墨卡托（3857）坐标系的数据。Github有专业用户修改了mapbox-gl的相关代码，支持CGCS2000的切片数据加载，并且修改了相关的mapbox-gl的配套代码，详情请见github网址。https://github.com/cgcs2000

2.将MapBox部署到本地

npm i @cgcs2000/mapbox-gl

<!DOCTYPE html>
<html><head><meta charset='utf-8' /><title>Mapbox加载天地图CGCS2000矢量瓦片地图服务</title><meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' /><style>body {margin: 0;padding: 0;}#map {position: absolute;top: 0;bottom: 0;width: 100%;}</style>
</head><body><div id='map'></div>
</body>
<script type="module">
import '@cgcs2000/mapbox-gl/dist/mapbox-gl.css'
import mapboxgl from '@cgcs2000/mapbox-gl';mapboxgl.accessToken = 'YourToken';
//添加天地图
var mapStyle = {"version": 8,"name": "Map","sources": {"world-vec": {"type": "raster","tiles": ["http://t0.tianditu.gov.cn/vec_c/wmts?tk=......"],"scheme": "xyz","maxzoom": 9,"tileSize": 256},"layers": [{"id": "world-vec","source": "world-vec","type": "raster","layout": {"visibility": "visible"}},],"glyphs": "mapbox://fonts/mapbox/{fontstack}/{range}.pbf","transition": {"duration": 300,"delay": 0}
}var map = new mapboxgl.Map({container: 'map',zoom: 7,center: [118.8, 36.3],style: mapStyle,
});/**CGCS2000投影坐标系（4490）**/
map.on('load', function loaded() {//添加geoserver矢量切片map.addSource('custom-go-vector-tile-source', {type: 'vector',scheme: 'tms',tiles: ['http://localhost:8080/geoserver/gwc/service/tms/1.0.0/MyWork%3Acounty@EPSG%3A4490@pbf/{z}/{x}/{y}.pbf'], //GeoServer发布的矢量切片地图zoomOffset: -1});//配置矢量切片图层样式map.addLayer({"id": "custom-go-vector-tile-layer","type": "circle",       // 符号化样式 [fill,line,symbol,circle,heatmap]"source": "custom-go-vector-tile-source","source-layer": "county",  //添加矢量图层名"minzoom": 5,"maxzoom": 13,paint: {'circle-radius': 1,'circle-color': "#000000",'circle-opacity': 0.8}});});</script>
</html>

3.GeoServer发布CGCS2000的矢量瓦片服务

1.安装过程自行百度，Tomcat下面部署Geoserver可能会遇到跨域访问问题。将geoserver部署到tomcat之后，打开tomcat下webapps\geoserver\WEB-INF目录下的web.xml文件，添加一下内容，重启tomcat即可。

    <filter><filter-name>CORS</filter-name> <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class><init-param> <param-name>cors.tagRequests</param-name> <param-value>true</param-value> </init-param></filter><filter-mapping> <filter-name>CORS</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

2.发布矢量瓦片服务
GeoServer默认只有84的坐标系，我们需要自己定义CGCS2000的坐标系。
首先，点击Tile Caching下的Gridsets，创建一个新的坐标系

在框选的地方搜索4490，选择为CGCS2000坐标系，其他数据按图填写（279,541,132.0143589），级别自定义。

设置完成后在矢量切片设置页，将新设置坐标系添加进来

在TMS页就可以看到服务地址

4.效果展示