I am trying to fly a mission on a Coal Surface mine using a DJI Inspire 1 Pro. The area I am trying to fly used to be a valley that they have converted into a Impoundment and fill area. The elevation change is roughly about 80 feet from the surface model in UGCS. I have added a new surface model and made sure the elevation Z order was reflecting the new surface model.
I did notice that when I turn the drone on while setting on the ground it reads an AGL of -20 feet. I selected my update takeoff point altitude and selected the button to read the elevation from the current surface model and it updated it everything looked correct my AGL was reading 0 ft.
However, as soon as I select upload mission to vehicle my Agl changed backed to -20 feet and gave me the error Altitude too high when trying to execute the mission. Like it ignored the update takeoff point altitude.