Im getting an antenna height error in all my images using a dji phantom 4 rtk.
Rs2+ as my base over a known point. No matter what I try, when processing, there is an error and this error is the exact height of the base antenna.
I found a thread with this issue but it wasnt solved via the drone, only post processing.
What height is recorded on an image with the drone sitting on the ground right next to the known point?
Its recording the height of the ground marker, so roughly the antenna height of the base less.
I guess I’m not understanding. The drone, when sitting on the ground next to the known point, is recording the elevation of the known point in the image exif? If so, that is perfect. What are you wanting it to show?
Yes. When processing in propeller, there is a height error. And that height error is the antenna height. The first time I set it up on a tripod at around 1.2m and we had a 1.2m error. The 2nd time I used the emlid 1.8m pole and we had a 1.9m error.
The processing software must be automatically accounting for the Antenna Height (pole height to ARP of receiver) and maybe the small amount of APC too???
In your receiver base settings, you specify your pole height so that the coordinate you enter is the height on the ground, not the height of the receiver at the top of the pole.
Then, you send corrections to the drone. And, if you set the drone on the ground at basically the same height as the know point, it records that elevation to the image exif.
If the above is accurate, then everything is perfect. Something is going off the rails in your Propeller workflow. I do not use Propeller, so I can’t help much there, sorry. If the error is the pole height, then it must have something to do with settings in Propeller. You might be telling Propeller the pole height when maybe you should just be telling it the height of the base point. Guessing here.
Hi Kieran,
When you set up the Reach as a base for the drone, for example, using a GCP with 1 meter elevation and a 1 meter pole. The drone will show the base elevation as 2.134 meters. This is not a mistake, since the base sends correction data from the Antenna Phase Center, which adds to the height:
Hope that clears things up! If you have more questions, feel free to ask here. Other users and I will be happy to help.
Correct, I think the error is with the propeller processing team. Thanks
