Hi, We recently started using an Autel Evo III RTK v3 UAV for some of our mapping projects. We’re running into some strange issues. First, we had a ~39% relative difference between initial and optimized camera parameters. I thought I had that fixed by reprocessing Step 1, but when I added GCPs and check points, I’m getting pretty bad residuals on my check points. I first ran the project holding 5 of my 9 panels as 3D GCPs, and was getting residuals over 1 ft (0.30m). I added 2 panels as 3D GCPs, using the remaining 2 as check points. I’m still getting residuals of ~0.7’ (0.20m) vertical, although the horizontal is acceptable for the check points (~0.1’/0.03m). I am re-optimizing after each change in picking GCPs and/or choosing which are held as 3D GCPs and which are used as check points.
For my PPK processing of the images, I’m using a RINEX file from a Leica GS16 GNSS receiver, converted using Leica Infinity and Emlid Studio to run the PPK. I had a few float solutions, but only about 14 out of nearly 500 photos. These were at the beginning of each mission.
I noticed when I first ran Step 1, there was a downward curved “banana” shape to the calibrated camera locations. I am using the default camera settings from the Pix4DMapper database for the XL705 camera. This camera does have a rolling shutter, which isn’t ideal I know, but I don’t think that alone should have this large of an effect. We never had this issue with out Phantom 4 Pro, which is also rolling shutter.
I have attached the latest quality report.
Thanks in advance,
David
MSB_TalkeetnaDike_250522_report.pdf (1.1 MB)
