Photogrammetry Workflow Guide
How to Create a Georeferenced NeRF from Drone Imagery
Build georeferenced NeRFs from drone imagery: RTK/PPK integration, COLMAP geo-registration, Nerfstudio, point cloud export, checkpoint validation.
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Tag Archive
GCPs
7 articles on GCPs. Field-tested methodology from a GIS scientist with M.S. GIS, FAA Part 107, and 10+ years of geospatial work.
Survey Accuracy & GCPs
Drone Map Vertical Bias: Why GCPs Don't Always Save You
Your drone map is a meter low everywhere except around the GCPs. Here is the diagnostic decision tree for vertical bias — and the fixes that actually work.
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Drone Hardware
Best Consumer Drones for Mapping in 2026
Consumer drone mapping buyer's guide: DJI Mini 4 Pro vs Mini 3 Pro vs Autel Evo Nano+. Accuracy, rolling shutter, GCP needs — field-tested verdicts.
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Survey Accuracy & GCPs
Drone Survey Positioning: GPS vs RTK/PPK vs GCPs Explained
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.
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Software & Processing
WebODM vs Pix4D vs Agisoft Metashape vs RealityCapture: 2026 Verdict
RealityCapture vs Agisoft Metashape vs Pix4D vs WebODM — pricing, speed, accuracy, and GCP workflow compared, and which one wins for survey-grade work in 2026.
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Survey Accuracy & GCPs
RTK vs PPK Drone Mapping: Which Should You Use?
RTK vs PPK for drone surveys: both hit 1-3cm accuracy. RTK corrects in real time, PPK processes post-flight. Failure modes, costs, when to use each.
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Featured Article
Survey Accuracy & GCPs
Ground Control Points for Drone Surveys: How Many, Where, and Why
How many ground control points does a drone survey need? 5 GCPs for under 5 acres, 8–12 for 50–500. Distribution beats density — and always include independent checkpoints.
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