1. Professor, Faculty of Spatial Information, Univ. of Applied Sciences Dresden, Friedrich-List-Platz 1, Dresden D-01069, Germany (corresponding author). ORCID: .
2. Architecture, Civil Engineering, Geomatics, Laboratory for Industrial Metrology, Frankfurt Univ. of Applied Sciences, Nibelungenplatz 1, Frankfurt am Main 60318, Germany. ORCID: