I've used Pix4d Capture on several projects to create a 3d model, including DSM. The elevation values in the DSM seem to be way off of reality.
IE, I did a flight mission at the beach, and the DSM indicated that my elevation was -18 ft at the water's edge.
So, I'm wondering how the Pix4d software generates the elevation data in the DSM--Does it pull information from the drone's GPS's sensors during the flight? Is it calculating Z based based on something else?