Example

const origin = new hmap.basetype.Coordinate(13373475.24417606, 3546021.213117677, 51.28688707057486)
const target = new hmap.basetype.Coordinate(13373010.735461526, 3545991.690268789, 68.97374183182579)
const viewshed = new hmap.geosolution.view.Viewshed(
         origin, //观察点坐标
       {
         target, //目标点坐标
         horizontalFOV: 80, //水平视场角
         verticalFOV: 80, //垂直视场角
         outerRadius: 200, //最远观察距离
         innerRadius: 0.01 //最近观察距离
       }
);