On-board GPS

Many sUAS and some sensors have an integrated GPS that “tags” the image or sensed information with a GPS location. This is commonly referred to as a geotag. These geotags are helpful because they give a rough location (typical trusted accuracy of 1-3 meters in XY and 3-5 meters in Z) of where the data was captured. This greatly improves processing time for structure from motion workflows. Though technically a form of direct georeferencing, these type of geotags are not referred to in that context because of their low accuracy. For high accuracy geotags, see the next tab for information on direct georeferencing.