The LIDAR is a laser sensor, which detects the relative distance between the target and the sensor, in combination with an IMU platform (GPS + INS) that allows 3D georeferencing of these points.
By scanning the surface, it creates a cloud of points which separate the points relating to the terrain (DTM) and those related to the “objects” on the ground (DSM).
Measuring the vegetative layer, penetrating to the ground, you get information on the ground and on quotas, with centimeter accuracy.
The products obtained from LIDAR measurements provide the basic information for punctually represent the morphology of hydrogeological hazard areas.
Therefore constitute a basic support for the hydraulic modeling activities, for the delimitation of areas of potential flooding of major rivers, and for hydrological modeling and identification of areas most exposed to danger in the event of flooding. In addition, the models can also be used in forestry, road and concept design of public works, etc ..
The density of survey points is greater than 1.5 points per square meter, it is deduced that the application of these findings for soil conservation is manifold. The DTM elevation presents an accuracy corresponding to +/- 1 s (standard deviation), corresponding to an error lower than ± 15 cm. While the planimetric accuracy is (2S) that the error must be within ± 30 cm.