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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 ?https://www.youtube.com/watch?v=z-KcxsU7lWs 

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:  https://support.pix4d.com/hc/en-us/articles/202558889 

Best Regards,