LiDAR and photogrammetry are both remote sensing technologies that create 3D data, but they work differently:
LiDAR (Light Detection and Ranging):
- Measures distance directly using laser pulses
- Works independent of ambient light
- Penetrates vegetation (multiple returns)
- Generates sparser but cleaner data
- Higher equipment cost
- Best for: Forestry, topography, corridors
Photogrammetry:
- Calculates 3D from overlapping photos
- Requires good lighting and visibility
- Cannot see through vegetation
- Creates dense, colorful point clouds
- Lower equipment cost
- Best for: Construction, quarries, facades
Accuracy Comparison:
- Both can achieve 2-3cm with GCPs
- LiDAR more consistent in varied conditions
- Photogrammetry can achieve higher density
When to Use Each:
Choose LiDAR:
- Vegetated terrain
- Bare earth required
- Power line corridors
- Poor lighting conditions
Choose Photogrammetry:
- Clear, visible surfaces
- Texture/color important
- Budget constraints
- Construction sites
Many projects benefit from combining both methods.