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As this documentation – Coordinate systems, especially this section – Handling tracking errors said, how accurately the headset locates itself depend on the detailed sensors data. The accuracy will fluctuate as the environment changes. Currently, there is no official documentation shows the specific range of the accuracy of the sensors. According to some cases and experiments, if the environment meets the requirements, the accuracy of the position data can reach ± a few centimeters. For more information, you can consult related literature, such as Evaluation of HoloLens Tracking and Depth Sensing for Indoor Mapping Application on your own.
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