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GIS?????? - Openlayers, Leaflet, Cesium ?
? GIS???????????????????????????????????????? GIS ??????? Openlayers?Leaflet?Cesium ???????????????
1. GIS ????
GIS ???????????????????????????????????????????????????????????????????
2. ????
GIS ????????????????????????????????
- EPSG:3857??????????????Web?????
- EPSG:4326????????????????????
???????????????????? EPSG:3857 ???????????
3. ?? API
?? GIS ???????????? API???????????????????????
3.1_View ??
- center???????????
- zoom??????????
- projection???????????
EPSG:3857? - extent?????????????
[minx, miny, maxx, maxy]? - rotation????????????
0 ? 360 ??
3.2_View ??
- setCenter?????????
- setZoom??????????
- getCenter???????????
- getZoom??????????
4. ?? GIS ????
? GIS ??????Openlayers?Leaflet ? Cesium ????????
4.1_Openlayers
- ?????????????????????????
- ???????????????????
- ????????????????????
4.2_Leaflet
- ????????????????????
- ????????????????????
- ??????????????????????
4.3_Cesium
- ???3D???????????????????
- ????????????????????
- ??????? 3D????????????????????
5. ????
- ??????Openlayers ??????????????????
- ?????Leaflet ??????????????????
- 3D???Cesium ???????? 3D ??????????????
?????? GIS ?????????????????????
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