3D scanning accuracy varies by equipment and method:
Survey-Grade Terrestrial Scanners: Trimble X12, Leica RTC360, and FARO Focus Premium achieve millimeter-level accuracy at typical working distances. These are used for high-precision applications like industrial metrology, survey control, and engineering documentation.
Mobile Mapping Systems: NavVis publishes 5 mm local accuracy for the VLX 3 and Leica publishes 6–15 mm relative accuracy for the BLK2GO. These trade some precision for far faster capture, ideal for large facility documentation.
Drone Photogrammetry: With proper ground control points, drone mapping achieves ±2-3cm horizontal and vertical accuracy. This is sufficient for topographic mapping, construction monitoring, and volumetric calculations.
Drone LiDAR: Professional systems like the ROCK R3 Pro V2 publish a 2–3 cm system accuracy at 40 m AGL, enabling survey-grade deliverables for large areas including vegetation-covered terrain.
The key is matching equipment to accuracy requirements—over-specifying accuracy increases cost without benefit.