TECHNICAL ASPECTS RELATED TO THE APPLICATION OF SFM PHOTOGRAMMETRY IN HIGH MOUNTAIN
- 1Dept. of Architecture, Built Environment and Construction Engineering (DABC), Politecnico di Milano via Ponzio 31, 20133 Milano, Italy
- 2Polo Territoriale di Lecco, Politecnico di Milano via G. Previati 1/c, 23900 Lecco, Italy
- 3Dept. of Earth Sciences ‘A. Desio’, Università degli studi di Milano, via Mangiagalli 34, 20133 Milano, Italy
- 4Dept. of Environmental Science and Policy (DESP), Università degli studi di Milano via Mangiagalli 34, 20133 Milano, Italy
- 5Agricola 2000 S.C.P.A., 20067 Tribiano (MI), Italy
Keywords: Alpine Environment, Glaciology, Photogrammetry, Structure-from-Motion, UAV/UAS
Abstract. Structure-from-Motion (SfM) photogrammetry is a flexible and powerful tool to provide 3D point clouds describing the surface of objects. Due to the easy transportability and low-cost of necessary equipment with respect to laser scanning techniques, SfM photogrammetry has great potential to be applied in harsh high-mountain environment. Here point clouds and derived by-products (DEM’s, orthoimages, Virtual-Reality models) are needed to document surface morphology and to investigate dynamic processes such as landslides, avalanches, river and soil erosion, glacier retreat. On the other hand, from both the literature and the direct experience of the authors, there are some technical issues that still deserve thorough investigations. The paper would like to address some open problems and suggest solutions, in particular on regards of the photogrammetric network design, the strategy for georeferencing the final products, and for their comparison within time. The discussion is documented with some examples, mainly from surveying campaigns at the Forni Glacier in Italian Alps.