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Volume calculations and GCP placement

is it necessary to place GCP on top of a very large stockpile to get accurate volume calculations ? 

Hello Ramiro,

Ground Control Points (GCPs) will increase the absolute accuracy of the model, i.e. the model will be correctly placed on a coordinate system. However, by adding GCPs you will also improve the relative accuracy of the model. 

You can check about accuracy here: 

Best Regards,