JerckyLY / postgis-stMvt

python 后台连接postgis 返回矢量切片,前端mapboxgl加载显示 50万点数据，秒级显示

postgis-stMvt

python 后台连接postgis 返回矢量切片

使用

• 在tileOline.py中配置自己的postgis连接参数

    Dbpool = psycopg2.pool.SimpleConnectionPool(
       1,
       100,
       dbname='GISMVT',
       user='postgres',
       host='localhost',
       password='admin',
       port='5432')
  

• 重要的查询语句

   // 传 source-layer 和 tableName参数动态获取
   query = "SELECT  ST_AsMVT( tile , '" + sourceLayer + "' , 4096 , 'geoms' ) tiles FROM ( SELECT   ST_AsMVTGeom( w.geoms , ST_Transform( ST_MakeEnvelope ( %s,%s,%s,%s,4326),3857),4096,256,true) AS geoms ,w.* FROM (SELECT  ST_Transform(geom,3857) geoms , * FROM public." + tableName + "  ) w ) AS tile ;"
  

• mapbox前端加载代码

  this.map.addLayer({
                 "id":"PostGIS",
                 "type":"circle",
                 "source":{
                     "type":"vector",
                     "tiles":[window.origin+"/mapserver/tiles/{z}/{x}/{y}"],
                 },"source-layer":"fills",
                 "paint":{
                     "circle-opacity":1,
                     "circle-radius":2,
                     "circle-color":"#00f"
                 },
                 "layout":{
                     "visibility":"none"
                 }
             });

结果