These control points were measured as
UTM (Universal Transverse Mercator) coordinates on theWGS84 ellipsoid
with an approximately accuracy of 1 cm in position and height. For
the first approach, six of these control pointswere used for the transformation
of the UAV results. Afterwards, the remaining control points of
the transformed point cloud were manually measured and compared.
An average positional error of 5.6 cm and a height error of 2.5 cm
were measured for the results using the software PhotoScan. Further results
reported showthat the errors largely depended on the topography
of the test bed area.