I've been trying to find open source software for calculating the volume of material removed from a surveyed area. For example: In open pit mining where you take a series of way points or lidar point cloud data before mining begins, then periodically after material has been removed you take additional measurements to determine how much material was removed.
I have been looking in the Android app store, Google searches, etc. but have not found anything. There are professional solutions but I'm looking for open source alternatives that I could modify for my own use.
I can write my own app but am concerned about the accuracy of the few techniques I've thought about.