We have experience in UAV survey of the quarry without GCPs made by DJI PHANTOM 4 PRO with additionally installed survey grade GNSS receiver.
9D0BA036-2850-4F56-A3DA-B6D0F21BB8FA by Maxim posted May 19, 2018 at 2:20 PM
FE355A0A-B826-4478-819C-30F3E9EBEDDC by Maxim posted May 19, 2018 at 2:20 PM...