In short
With RTK/PPK ground control, drone mapping typically achieves 2 to 5 cm horizontal accuracy, tight enough for quantities, layout checks, and progress documentation. Accuracy depends on ground control, flight altitude (image resolution), camera, and conditions, so it should be controlled and verified on each site, not assumed from a brochure.
What the numbers actually mean
Accuracy comes in two flavors. Relative accuracy is how consistent measurements are within the map (good for comparing areas and volumes). Absolute accuracy is how well the map lines up with real-world coordinates (what you need to tie into a site datum or design). Flown with control, both land in the few-centimeter range for typical site work.
A useful rule: a map is only as accurate as it's controlled and verified. A pretty map with no ground control can be off by a lot while looking perfect on screen.
What RTK/PPK and checkpoints do
RTK and PPK tag each photo with a precise position at capture, which anchors the whole model. Ground control points and independent checkpoints then verify the result, the checkpoints are how we prove the accuracy rather than just claim it.
When a provider can show you checkpoint residuals for your site, that's the difference between measured accuracy and marketing accuracy.
What drives accuracy on your site
Flight altitude sets the ground resolution (lower flights, sharper detail, better accuracy). Ground control quality and distribution matter. So do conditions: wind, lighting, and featureless surfaces (fresh snow, smooth water) all make reconstruction harder. A good provider plans the flight around your accuracy requirement instead of flying everything the same way.
Frequently asked
What is the typical accuracy of drone mapping?
With RTK/PPK ground control, typical horizontal accuracy is 2 to 5 cm for site-scale work. This supports quantities, layout checks, and progress documentation. Accuracy varies with control, altitude, and conditions, so it's verified per site.
How is drone mapping accuracy verified?
Independent checkpoints, surveyed points not used to build the model, are compared against the map to measure the actual error (residuals). That's how accuracy is proven rather than assumed.
Is drone mapping accurate enough for a legal boundary?
Accuracy is not the issue, legal authority is. Drone mapping is not a legal survey; boundaries require a licensed surveyor. We coordinate with a partnered licensed surveyor when survey-grade certification is needed.
Still not sure what you need?
Tell us about your site and we'll point you to the right approach, then send a fixed quote.