Improving the Accuracy of Drone Measurements on Hydrotechnical Works

Topographic measurements made with the drone is an alternative way for creating 3D models, point clouds, etc., but they should be considered correct placement of ground control points to complete the required works precisely. To meet these needs to have a sub millimeter precision in this publication we will treat such as positioning, verification and comparison precisions achieved by attaching ground control points to the point cloud. These ground control points are measured with two different devices, namely the robotic total station and two dual-frequency GPS receivers used in base & rover mode. Errors made on ground control points can influence the whole cloud of points and we will demonstrate the extent to which this occurs.