自定义高德地图添加覆盖物标记
点标记-覆盖物-教程-地图 JS API|高德地图API
https://lbs.amap.com/api/javascript-api/guide/overlays/marker
快速上手
https://lbs.amap.com/api/javascript-api/guide/abc/quickstart
其他坐标变换成高德坐标
https://lbs.amap.com/demo/javascript-api/example/other-gaode/othertoamap
高德地图坐标拾取
https://lbs.amap.com/tools/picker