Plane to fly over Montreal's waterways

The Communauté Métropolitaine de Montréal (CMM) will be testing a topobathymetric LiDar on the major rivers surrounding its territory (yellow areas on the map).

Over the next few days, you might spot a plane flying over areas near the shore. Blue and green lasers will be projected onto the ground. Exposure to this light is not harmful.

Topobathymetric LiDar is a method for measuring the shape of the bank and bottom of watercourses using three laser beams installed on an airplane. The data collected will produce a digital imagery of the terrain, which will be used during hydrological and hydraulic modeling as part of the mapping of flood zones and the forecasting system currently under development at the CMM.