A DTM representing areas which have been flooded, or are at risk of flooding, is fundamental for the control of morphological changes in stretches of rivers and coastal zones.
Airborne laser-scanner products allow detailed, quick and low-cost surveys of vast areas to be made, even during or immediately after flooding. In particular, the analysis of aerial photographs and the comparison between laser-altimetric surveys and orthophotos obtained before and after a flood allows the main morphological changes produced by flooding to be verified and analyzed, whether for insurance, flood relief, or planning future mitigation.
Furthermore, it is possible to accurately estimate the volumes of sediment moved by floods and extract data which is essential for the evaluation of stability conditions in the area.