Matrice 4E RTK height issue

[jaja6009]

If this is the case it should be noticed in the values just looking at them. The OP stated that the ground values and image values are what they expected. If the ground was ortho and the images ellipsoid, it should be obvious looking at the values as the image values would be too low compared to the ground if the ground was using ortho. But we are kind of shooting in the dark here.

My thinking was this.

He stated that the GPS heights (Assuming he meant GNSS Rover) were 58m, which is the orthometric elevation for that area shown on the RC Plus 2.

All DJI mapping drones with RTK use an ellipsoid elevation when receiving corrections, so that's what's in his image metadata.

He says his drone data (dem I assume) is reporting the ground as ~ 10 meters. The geoid undulation in that area is ~ 46 meters.

But like you said, a csv and some sample images would answer any question.

OP Dave or myself could help out with 6 images from 2 flight lines overlapping each other and the csv with rover data.

 

[Dave Pitman]

It's a good guess as apparently the difference between ellipsoid and geoid ranges from 45-55 meters. However, if the rover and the drone are receiving the same correction stream, then it should not be possible to have that offset. If the OP is telling the processor that the images are referencing ellipsoid and the ground points, orthometric, then maybe so? I never used Terra, so I have no idea if it would be easy to get crossed up like that. But, off the bat, the 2 devices receiving the same correction stream should be good.

 

[jaja6009]

It's a good guess as apparently the difference between ellipsoid and geoid ranges from 45-55 meters. However, if the rover and the drone are receiving the same correction stream, then it should not be possible to have that offset. If the OP is telling the processor that the images are referencing ellipsoid and the ground points, orthometric, then maybe so? I never used Terra, so I have no idea if it would be easy to get crossed up like that. But, off the bat, the 2 devices receiving the same correction stream should be good.

I guess we are just guessing until he figures it out or maybe shares some images and the csv file.