I read the article about volume differences of an area surveyed over different time periods, but I assume this is about single stockpiles, correct?
What if the customer wants to have an answer about a specific area of the gravel pit in regards to how much material has been added or extracted?
To be more specific:
We have a clear understanding of the topology of the gravel pint surveyed (April 2015) in the above link.
Now in September 2015, the customer wants to now, how much material has been added to a defined area of the gravel pit and how much material has been added to the total gravel pit.
So the topology measured this April would be used as a zero reference and material on top of this reference would be defined as material added to the gravel pit and we need to know, how much this will be.