Visual assessment of the area of interest in order to detect relevant land changes.
Photogrammetry techniques allow us to build an orthophoto mosaic of all surfaces as well as a corresponding 3D model to perform measurements of spatial magnitudes such as surface, width and volume.
- Cadastral survey: our aircrafts equipped with high-precision satellite antenna performs photogrammetric surveys with a position error of about 50 cm. The resulting photo mosaic can be checked against a geo-referenced digital cadastral grating. By cross-referencing these two maps a photo-interpretation can be carried out to determine the cadastral category and the intended use
- Surface models for spatial measurements (glaciers, rock masses, landslides, etc): 3D models can be built by triangulating the points of interest; they faithfully represent the reality, so spatial measurements with decimetre or sub-decimetre accuracy can be performed depending on the sensors used and on flight altitude