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Author Topic: Wingtra PPK Elevation error  (Read 1905 times)

j_bazer

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Wingtra PPK Elevation error
« on: March 27, 2021, 12:50:50 AM »
Hi all,

I'm having a consistent error (different for different jobs but usually 1-2 meters) in the elevations of my GCP checkpoint compared to my PPK model. Horizontally I'm within 5 centimters. I've checked and it's not the height of my base station. The checkpoints and static file for the ppk are both run off the same base station.

Any ideas on what's causing this or what I can do to eliminate this would be appreciated.


Thanks

Alexey Pasumansky

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Re: Wingtra PPK Elevation error
« Reply #1 on: March 27, 2021, 04:43:54 PM »
Hello j_bazer,

Which alignment parameters are you using? Do you optimize the alignment?

Please check, if using Fit Additional Alignment in the Optimize Cameras dialog helps to improve the resulting accuracy.
Best regards,
Alexey Pasumansky,
Agisoft LLC

j_bazer

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Re: Wingtra PPK Elevation error
« Reply #2 on: March 28, 2021, 12:47:08 AM »
Thanks Alexey,

For alignment parameters I'm using the defaults: accuracy set to high, generic and reference preselection (source) both on. Key and tie point limit set to 40,000 and 4,000 respectively. I optimize the alignment yes, and using Fit Additional Corrections in the Optimize Cameras dialog didn't improve the accuracy.

Alexey Pasumansky

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Re: Wingtra PPK Elevation error
« Reply #3 on: March 28, 2021, 12:48:46 PM »
Hello j_bazer,

Can you please then send the project with the alignment results only (cameras, markers and tie point cloud) to support@agisoft.com?
Best regards,
Alexey Pasumansky,
Agisoft LLC

j_bazer

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Re: Wingtra PPK Elevation error
« Reply #4 on: March 29, 2021, 06:44:16 PM »
Sent, thanks.