Saint-Georges-de-l’Oyapock: 60 hectares of LiDAR to position a collimation mast

Background

As part of a radar installation project in Saint-Georges-de-l’Oyapock, CNES had to define the visibility conditions between the radar and a collimation mast, through dense forest, clearing as little as possible.

What we did

We surveyed a 60-hectare corridor by LiDAR, 2 km by 300 m, i.e. more than 300 million georeferenced points. The terrain model defines the lines of sight without vegetation, the surface model outlines the trees to be felled and the orthophoto serves as a location plan. The analysis made it possible to choose the mast position that limits the forest area to be cleared.