Aerial LiDAR vs Terrestrial LiDAR: What's the Difference?

Both technologies use the exact same core principle: laser pulses measuring distance to create a 3D point cloud. But where the sensor sits changes everything about what data you get and what it is useful for. Choosing the wrong one means either paying for detail you cannot use, or missing detail your project actually needs.

Aerial LiDAR: Mounted on Drone or Aircraft

The sensor flies above the survey area, sweeping laser pulses across a wide swath as it moves. This covers large areas quickly, capturing terrain, vegetation, and structures across kilometres in a single flight. Point density is lower per square metre compared to terrestrial scanning, but coverage area is dramatically larger.

Terrestrial LiDAR: Fixed or Mobile Ground Scanner

The sensor sits on a tripod or vehicle at ground level, capturing extremely dense point clouds of everything within line of sight. Detail on vertical surfaces — building facades, tunnel walls, bridge undersides — is far superior to what aerial scanning can achieve, because the sensor sees these surfaces directly rather than from above.

When Projects Use Both Together

For terrain, corridors, and large-area mapping, aerial LiDAR is the practical choice. For structural inspection, as-built documentation, and any project requiring millimeter-level detail on vertical surfaces, terrestrial scanning delivers what aerial data physically cannot capture.