Digital terrain model (DTM) 2022

The Digital Land Model (DTM) was derived from the LiDAR (Light Detection and Ranging) survey carried out on 17 May 2022 on the entire urban area of Ferrara, as part of the Experimental Programme of Actions for Adaptation to Climate Change in the Urban Area (Ministry of the Environment and Energy Security). The DTM has a ground resolution of 1x1 m and is available in the geographical reference system EPSG:7791; each cell of the DTM has a numerical value (Band1) corresponding to the share of the land above sea level - The acquisition took place by air flight performed by the company AVT Airborne Sensing Italia, with Riegl VQ780II-S laser scanner sensor of the company Riegl Laser Measurement Systems GmbH. The raw 3D point cloud produced by LiDAR was aligned and georeferred with centimeter precision thanks to the use of 3 x 3 point grids measured on the ground with topographic surveys. The points were classified into points on the ground and above ground with a combination of commercial software and algorithms implemented in AVT. The points classified as ground were checked, filtered and interpolated in a grid to obtain the DTM in raster format. The quotas have been transformed from ellipsoid to orthometric through the use of geoid oscillating grids provided by the Military Geographic Institute of Florence.