PPK Post Processing; Inconsistent Results

lidarservicesnw · May 10, 2022, 4:18pm

sample data: SampleDataExtract - Google Drive

Hi - added here into this post is all the data captured in the field. I took 6 total ground control points (PPK Post Processing), and only 3 looked correct in the LiDAR data after PPK Post processing from the ROVER. In the Misalignment GCPs, youll see GCP4 is off by 20 feet. GCP5 is off by 5 feet. GCP3 is off by several feet. Then you will see GCP 1, 2, and BASE are accurate in the expected ground control. all ROVER points from the survey were successfully ‘fixed’, so I dont know why some of them are so off and some of them are exactly on point. please let me know if there’s anything additional i can add. thank you for taking a look at this!

julia.shestakova · May 11, 2022, 6:57pm

Hi Russ,

Thanks for sharing the files!

Please give me a bit of time to check them, and I’ll get back to you with the response.

lidarservicesnw · May 14, 2022, 12:18am

Thank you! I was thinking recently that there may have been an issue due to not changing the default coordinate system in the survey project on the reach RS2 (ROVER). I noticed the default is ‘Global CS’, when it really should be WGS84 / UTM zone 10N (32610). Could this have played a role in the inconsistent GPS Rover Accuracies?