*4.1. First Case Study: Prang Structure*

The models derived from the UAV and models obtained from TLS were compared with total station data to make more detailed assessments. The results listed in Table 3 indicate that the RMSE horizontal of the Prang structure for TLS-calculated data from 20 checkpoints of ground control is 0.068 m, and that of the UAV is 0.066 m. The RMSEs of the vertical Prang structure were 0.030 and 0.054 m for TLS and UAV, respectively.

**Table 3.** RMSE of Prang, computed on 20 checkpoints for the terrestrial and UAV point clouds.

