arcgis 公开发布地图地址（测试用）

1.WGS84(4326)

影像 http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer

街道 http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer

地形 http://server.arcgisonline.com/arcgis/rest/services/NGS_Topo_US_2D/MapServer

2.WGS84 墨卡托 102100  (3857) 

影像 http://server.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer

街道 http://server.arcgisonline.com/arcgis/rest/services/World_Street_Map/MapServer

地形 http://server.arcgisonline.com/arcgis/rest/services/World_Topo_Map/MapServer