Greetings from Balochistan!

I have ground control points ( including elevation data) data taken with  total station. When I entered adjusted coordinates in RC of Matrice  300, saving data failed due variation of about 21 metter in elloposoidal  height. I checked ellevation with use of two different handheld GPSs:  both the GPSs showed almost same elevation  but the difference between  elloposoidal height of D-RTk-mobile station and elevation of GPSs was  more than 20 m. Since I'm not a surveyor, I can't figure out the issue.  Any guidance please? Are elliposoidal height and ellevation shown in  GPSs same  type or some sort of conversion required?

Hello, there. Sorry for your inconvenience. We would recommend you change the ground control point to another open field. The height should adopt the ellipsoidal height of the WGS 84 model. Then enter the height into the device.