As far as I know, drones use GPS satellite systems to obtain their position. They usually have associated some degree of error at least you use differential GPS equipment. What other sources do the drone must use to ensure accurate measurement of land surface area?
Regards
Hi Mauricio
I am agree with Jens. But be careful, if you use a GPS to measure Ground Control Points (GPC) be careful and be sure about it can provide centimeter accuracy. On the other hand, I will recommend you at least a 60% overlap on the photograph (vertical and horizontal) taken to obtain the ortho on which you are going to measure, otherwise you could not reach the desired results.
Best,
Antonio J.
The precision and accuracy are going to be influenced at every stage, from planning through post-processing and cartography. And crudely divided into two categories, internal and external consistency. I recently did an experiment on a friend's property using a consumer grade DJI drone. And I was very fortunate to have a really good lidar dataset and cadastral GIS and property surveys to compare to. The precision and accuracy are not uniform across the data, especially over several flights. In very general terms, having well distributed ground control points had the most influence in the end. Having any sort of DSM is way helpful for flight planning to ensure coverage and inter-visibility of the drone and GCP's. Elevation variance over the flight matters, as well as calibrating the drones altimeter. Vegetation is the greatest interference, and bites during post processing. Overall, I wish the drone operator had far greater understanding of the algorithms and especially the setting of initial parameters before flying. I found that the attitude data of where the camera was point had more influence on the photogrammetry than positional and altitude data.
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