How do I place Ground control point(GCP)/Checkpoint(CHP) markers?

Question

How do I place Ground control point(GCP)/Checkpoint(CHP) markers?

Answer/Cause

Please install as follows. 

Please place the Ground markers within the drone flight plan so that they are captured with enough coverage of photos. 

Please measure the center of markers using a GNSS rover or other high-precision measurement device. *Accuracy of measurement may result the poor output

Please set up the drone so that it surrounds the perimeter of the shooting site.