Design a UAV photogrammetry workflow for site volume calculations.

UAV workflow: flight planning - 75% forward/60% side overlap, altitude for 2-3cm GSD, obstacle-free flight lines. GCP deployment - 5-10 points distributed evenly with known coordinates from RTK-GPS. Pre-flight checks: weather, airspace clearance, battery, sensor calibration. Image acquisition in RAW format with metadata. Processing workflow: import to photogrammetry software (Pix4D, Agisoft), align images, identify GCPs for georeferencing, dense point cloud generation, mesh and DSM creation. Volume calculation: define base surface (pre-construction or design grade), compute cut/fill volumes with uncertainty estimates. Accuracy validation using independent checkpoints. Deliverables: orthomosaic, DSM, contours, volume report.