UAV LiDAR Survey
UAV-borne LiDAR records multiple returns per pulse, so ground points can be captured beneath tree canopy, which photogrammetry cannot do. It is the method of choice for forested hills, road and power-line corridors, and canals.
Typical specifications [x]
| Item | Value |
|---|---|
| Platforms | DJI M350 RTK / M400 RTK + Zenmuse L2 (L3) |
| Point density | [x] pts/m² at [x] m AGL |
| Accuracy (manufacturer, L2 @150 m) | Horizontal 5 cm, vertical 4 cm |
| Processing | DJI Terra → ground classification (CloudCompare/Global Mapper) |
Deliverables
- LAS/LAZ point cloud classified to ASPRS classes (ground, vegetation, building…).
- DTM, DSM, CHM (canopy height model), contour lines.
- Topographic map in DWG/DGN; corridor profiles.
- Point cloud viewing on WebGIS.
Applications
Road, irrigation and hydropower design · forestry (stand density, tree height) · landslides and flash floods · mining · archaeology under vegetation.
Compared with photogrammetry
| UAV imagery | LiDAR | |
|---|---|---|
| Terrain under canopy | No | Yes |
| Colour orthophoto | Yes | Yes (integrated RGB camera) |
| Cost per ha | Lower | Higher |