LiDAR vs Photogrammetry
LiDAR penetrates vegetation canopy to map bare earth — photogrammetry cannot. LiDAR works in low light and produces 3D point clouds directly. Photogrammetry is cheaper, provides color/visual texture, and is better for orthomosaics. Professional surveyors often use both: LiDAR for terrain, photogrammetry for surface.
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Drone LiDAR Systems
Entry (Livox Mid-360, ~$1,000): 40m range, 200k pts/sec, non-repetitive scanning. Mid-range (DJI L1, ~$13,000): 450m range, 240k pts/sec, integrated RTK. Survey-grade (RIEGL VUX-120, YellowScan): 500m+ range, 2M pts/sec, tactical-grade IMU, 1-3cm accuracy.
Flight Planning for LiDAR
Fly at 50-100m AGL for corridor mapping; 80-120m for area mapping. Speed: 3-8 m/s (slower = denser points). Overlap: 30-50% sidelap. LiDAR works in dawn/dusk but avoid heavy rain/fog. Plan multiple flight lines with cross-hatch for complex structures.
Point Cloud Processing
Process with LAStools, TerraSolid, CloudCompare (free), or DJI Terra. Steps: trajectory processing (GNSS+IMU), point cloud georeferencing, noise filtering, classification (ground/vegetation/building), and DEM generation. Output: LAS/LAZ, DSM/DTM, contours (DXF), canopy height model.
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