Without an external GNSS/RTK device, vGIS relies on the vGIS calibration for the initial positioning and then on the optical tracking when moving around. Although optical tracking provides the stability and accuracy suitable for most field deployments, it also has a 1–4% margin of error in normal light and 3–8% in low-light conditions1. What this means is that for every 10m traveled, the system may miscalculate the travel distance by as much as 0.4m in normal light or up to 0.8m under the worst circumstances.
Understanding this error margin and the ways to minimize it will help you make the most of the system.
Note: In over 95% of cases1, the error applies only to objects away from the starting point. Typically, the starting point remains locked in the same physical position regardless of the distance traveled, even if the distance to the endpoint has been miscalculated and the endpoint appears closer or farther than it is.
1Study conducted by Meemim Inc. from November 2017 to March 2018 to measure the distance-tracking margin of error by HoloKit, ArKit and ArCore. All rights reserved.