Members of the group gave a two-day training to six specialist from the General Commission for Survey of the Kingdom of Saudi Arabia. The training was organised in cooperation with UNIGIS, Geodan and the VU. The two days in Delft covered topics such as 3D city models, 3D cadastre, LOD in 3D, validation and repair of 3D city models, 3D representations (voxel and vector), 3D reconstruction, and 3D indoor modelling. The visitors had two practical assignments on outdoor and indoor 3D reconstruction.