LiDAR

LiDAR is an acronym for light detection and ranging. A LiDAR sensor, usually mounted on an aircraft or a drone, calculates the time it takes for a beam of laser light to bounce of an object and return to the senor. It is used to create accurate 3D Digital Surface Models (DSMs) of the Earth’s surface.

How is LiDAR used?

LiDAR has many applications, but is particular useful in flooding risk modelling, surveying and archaeology. An aircraft mounted LiDAR sensor can be used to create DSMs with typical resolutions ranging from 30cm to 2m. Mounted to a drone, a 10cm resolution can be achieved. Together with its accurate vertical measurement, LiDAR can be used to discover subtle features not easily visible on the ground such as ancient ditches and roadways.