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3 articles on checkpoints. Field-tested methodology from a GIS scientist with M.S. GIS, FAA Part 107, and 10+ years of geospatial work.
Four positioning tiers for drone surveys: GPS, RTK/PPK, GCPs, and full RTK+GCPs+checkpoints. Match accuracy to the job — not every project needs the top tier.
Real drone survey accuracy in 2026: ±2–5 cm horizontal, ±3–12 cm vertical typical. RMSE vs CE90 vs LE90 explained, ASPRS classes, 5 red flags in any quality report.
How many GCPs does a drone survey need? 5 for under 5 acres, 8-12 for 50-500. Distribution beats density. Always include independent checkpoints.
Free download: The Complete Drone Mapping Workflow Guide — 30+ pages of field-tested methodology.
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