INTEGRATION OF TERRESTRIAL AND UAV PHOTOGRAMMETRY FOR THE ASSESSMENT OF COLLAPSE RISK IN ALPINE GLACIERS
- 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 Environmental Science and Policy (DESP), Università degli studi di Milano via Mangiagalli 34, 20133 Milano, Italy
- 4Dept. of Earth Sciences ‘A.Desio’, Università degli studi di Milano, via Mangiagalli 34, 20133 Milano, Italy
- 5Agricola 2000 S.C.P.A., 20067 Tribiano (MI), Italy
Keywords: Forni Glacier, Glaciology, Photogrammetry, Structure-from-Motion, UAV/UAS
Abstract. The application of Structure-from-Motion photogrammetry with ground-based and UAV-based camera stations can be effectively exploited for modeling the topographic surface of Alpine glaciers. Multi-temporal repeated surveys may lead to geometric models that may be applied to analyze the glacier retreat under global warming conditions. Here the case study of Forni Glacier in the Italian Alps is presented. Thanks to the integration of point clouds obtained from the independent photogrammetric processing of ground-based and UAV blocks of images (captured on 2016), a complete 3D reconstruction also including vertical and sub-vertical surfaces has been achieved. This 3D model, compared to a second model obtained from a ground-based photogrammetric survey on September 2017, has been exploited to understand the precursory signal of a big collapse that might have involved tourists and hikers visiting the glacier ice tongue during summer. In addition to some technical aspects related to the acquisition and processing of photogrammetric data of glaciers, this paper highlights how Structure-from-Motion photogrammetry may help evaluate the risk of collapse in Alpine glaciers.