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Author Topic: Issue processing rtk corrected imagery and GCPs  (Read 1279 times)

dsmapping

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Issue processing rtk corrected imagery and GCPs
« on: November 01, 2024, 06:38:45 AM »
I have a set of data Im working on and I have noticed that after I try to align a few of the control points I am unable to shift the data (update/ transform) to the gcp markers. The sparse cloud does not move at all.  Is this because the rtk data is better than the gcps or vice versa? If I turn off all cameras I am able to shift the data to the gcps, if I turn the cameras back on the residuals are off to the tune of 20 - 30 feet.  Any ideas of what I might should do? Is there an issue with camera or marker references? It was flown with a DJI Mavic 3E.


dsmapping

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Re: Issue processing rtk corrected imagery and GCPs
« Reply #2 on: November 01, 2024, 09:07:58 PM »
Yes I am, that guide is great.  But I cannot for the life of me get the data to transform.

olihar

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Re: Issue processing rtk corrected imagery and GCPs
« Reply #3 on: November 01, 2024, 10:49:15 PM »
Are you converting the drone data to the correct GEOid before processing?

When using RTK GCP should not be more then couple of cm off. Ifs its a lot more than that, the drone images are probably not in the correct height. (GEOid)

DayGeckoArt

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Re: Issue processing rtk corrected imagery and GCPs
« Reply #4 on: November 02, 2024, 10:17:08 AM »
Use the icon that looks like a recycling symbol to refresh the GCPs. Then use the star icon to realign your photos. Check all the boxes.


The program doesn't know which is more accurate except by the weighting. That's where you set the accuracy. Default for GCPs is 0.001 meters and default for photos is 0.1 meters I think. You can adjust those and it will change how much each gets weighted. I try to set those to the rough accuracy of each. In my case I set photos 100 meters and GCPs to 0.1 meters