Impact of quality of coordinates of the ground control points to calculate the volume of point close range photogrammetric capture

The purpose of this thesis was to determine how the quality of coordinates of the ground control points affects the volume calculation of construction excavation voids calculated from a point cloud. The point cloud was generated based on the photographs taken by an unmanned drone. The ground control points were initially measured using the faster but less accurate GNSS RTK method. Subsequently, we then measured the ground control points using a more precise classical geodetic measurement. The accuracy of the results of these measurements was then evaluated according to the ISO standard. The coordinates of the ground control points were determined by levelling the horizontal and vertical geodetic network. The volume calculation of the construction excavation void was carried out using the 3D Survey software, where the coordinates of the ground control points were defined with various methods of measurement. The volume measurement results obtained were then compared. The results showed the difference in volume amounting to less than 1 percent, proving the GNSS RTK method is accurate enough to be effectively used for georeferencing of a point cloud in order to accurately measure volume