What is LiDAR?

LiDAR provides detailed data capture of the terrain where dense vegetation is present. This works where the LiDAR sensor transmits laser light pulses and as it returns from the ground, it measures precisely the time taken for the laser pulses to return.

Typically drones fitted with a LiDAR sensor are generally more costly than drones that capture photogrammetry which is due to the specialisation and expenses of the sensors. The different LiDAR sensors can substantially affect the accuracy of the data.

These can be used for:

– Land survey under dense vegetation

– 3D modelling of structures

– Capturing major areas which the data is immediately required for analysis

– Vegetation intrusion towards power line passageway

LiDAR drone

But how is it different from photogrammetry?

The photogrammetry captures a high amount of high-resolution photos over an extended areas. When these photos overlap, the exact point in the terrain is found in multiple photos and from different perspectives. Photogrammetry utilises several common ground points to form a 3D reconstruction of the site.

In terms of accuracy, the photogrammetric drone can reach accuracies of 2 to 3 centimetres in hard terrains which are suitable for volumetric analysis. In LiDAR, the accuracy ranges between 1 to 2 centimetres. This will be costly considering the system expenses and the method of operation.

Drone photogrammetry aerial