How to calculate the volume for mining area.

1.How to calculate the volume for mining area.

2. I will draw a polygon in free hand around a mining area.I want to calculate the volume Please suggest me.

There’s nothing built into CesiumJS to do this. I think the easiest way might be to use the ion SDK tools:

Although I just realized the volume measurement tool isn’t done yet. I think it could probably be approximated by computing the area and the height.