The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLIII-B3-2021
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B3-2021, 727–734, 2021
https://doi.org/10.5194/isprs-archives-XLIII-B3-2021-727-2021
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B3-2021, 727–734, 2021
https://doi.org/10.5194/isprs-archives-XLIII-B3-2021-727-2021

  29 Jun 2021

29 Jun 2021

UAV PHOTOGRAMMETRY AND VHR SATELLITE IMAGERY FOR EMERGENCY MAPPING. THE OCTOBER 2020 FLOOD IN LIMONE PIEMONTE (ITALY)

L. Teppati Losè1, F. Chiabrando1, F. Giulio Tonolo1, and A. Lingua2 L. Teppati Losè et al.
  • 1LabG4CH, Department of Architecture and Design (DAD) - Politecnico di Torino, Viale Mattioli 39, 10125 Torino, Italy
  • 2Laboratory of Photogrammetry, Geomatics & GIS, Department of Environment, Land and Infrastructures Engineering (DIATI) - Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy

Keywords: UAVs, Direct Georeferencing, Emergency Mapping, VHR, Satellite, SfM

Abstract. Heavy rain between the 2nd and 3rd of October 2020 severely affected the area of Limone Piemonte, Piemonte Region (Italy). The consequence of those two days of rain was a flood that, starting from the hamlet of Limonetto severely damaged the areas close to the riverbed of the Vermegnana river and the related hydrographyc network. A synergistic multi-sensor and multi-scale approach for documenting the affected areas using VHR satellite images and UAVs (Uncrewed Aerial Vehicles) is presented. The pro and cons in terms of level of detail and processing strategies are reviewed with a focus on the workflows adopted for processing large UAV datasets. A thorough analysis of the 3D positional accuracy achievable with different georeferentation strategies for UAVs data processing is carried out, confirming that if an RTK (Reale Time Kinematic)-enabled GNSS (Global Navigation Satellite System) receiver is available on the UAV platform and proper acquisition guidelines are followed, the use of GCPs (Ground Control Points) is not impacting significantly on the overall positional accuracy. Satellite data processing is also presented, confirming the suitability for large scale mapping.