Photogrammetry Fundamentals
Photogrammetry converts overlapping aerial photographs into accurate 2D orthomosaics, 3D models, and elevation data through structure-from-motion (SfM) algorithms. Achievable accuracy: 1-3 cm horizontal with RTK/PPK and proper ground control. Key factors: overlap (70-80% front, 60-70% side), GSD (2-5 cm typical), and camera calibration.
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Flight Planning for Mapping
Use automated grid missions with consistent altitude and speed. Fly at 60-120m AGL for 2-5 cm GSD. Maintain 70%+ front overlap and 60%+ side overlap. For 3D models, add oblique (45°) flights in a cross-hatch pattern. Fly within 2 hours of solar noon for consistent lighting and minimal shadows.
RTK vs PPK Geotagging
RTK (Real-Time Kinematic) corrects GPS in flight via base station or NTRIP network. PPK (Post-Processed Kinematic) corrects after flight using RINEX logs. Both achieve 1-3 cm accuracy. PPK is more reliable (no radio link failures) and is the professional standard for drone mapping.
Processing Software & Deliverables
Pix4Dmapper, Agisoft Metashape, DJI Terra, and OpenDroneMap process imagery into: orthomosaic GeoTIFF, DSM/DTM, 3D mesh (OBJ/PLY), contour lines (DXF), and point clouds (LAS). Processing takes 2-10x flight time depending on resolution and GPU.
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