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Author Topic: align photos default settings  (Read 6435 times)

DCK

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align photos default settings
« on: March 13, 2021, 12:45:36 AM »
Can someone tell me the general AND advanced default settings for the align photos portion of the workflow. I was messing around and now I'd like to go back to the default. Thank you.

GrinGEO

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Re: align photos default settings
« Reply #1 on: March 13, 2021, 06:10:48 PM »
DCK, this is what I use

   1. Import Images
   In Camera Groups
   
   2. Check Camera Calibration + Rolling Shutter
   Tools > Camera Calibration
   
   3. Convert GPS coordinates of your geotagged images (WGS84) to match the coordinate system of your ground control poins (GCPs) which will be imported later
   
   4. Estimate image quality
   View -> Photos -> Detailed View -> Menu -> Estimate Image Quality
   Disable all images that have an image quality below 0.7
   
   5. Generate masks (Optional)
   if for example, you don't want to include cars or other moving objects. Optional.
   
   6. Align photos HIGH
   Pair preselection: REFERENCE
   Key point limit: 40,000
   Tie point limit: 4,000
   Adaptive camere model fitting: YES
   Note that you do not need to run the image alignment process twice if you follow this workflow.
   
   7. Import list of Ground Control Points
   also include the X/Y/Z accuracy values
   
   8. Refine GCP
   Select single markers & filter fotos
   
   9. Verify and link markers to images (use FILTER BY MARKERS). Because the acquired images and the markers now have the same coordinate reference system, it should be easy to find and mark your GCPs in your images. Mark each GCP in 3-6 images. That should be sufficient. When finished, press the UPDATE button in the reference pane.
   
   10. Assuming that you have a sufficient number of high accuracy ground control points, uncheck all images in the reference pane and also uncheck a few GCPs in order to use them as check points instead of control points. This will give you a better measure of the 'real accuracy' of your dataset.
   
   11. Clean Sparse Point Cloud
   > Model > Gradual Selection
   Remove all points with high reprojection error of >1
   Remove all points with high reconstruction uncertainty >100
   
   12. Adjust your bounding box
   
   13. Optimize camera alignment
   All settings
   
   14. Build Dense Cloud
   High

DCK

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Re: align photos default settings
« Reply #2 on: March 14, 2021, 03:39:33 AM »
GrinGEO,

Thank you for putting so much thought into you response. There is definitely information I can use. However, my question is much, much simpler...

After importing photos, the next step in a basic workflow is to align them. When you select "Align Photos" from workflow, the option menu shown in the attached image appears. I had been playing with the values and toggles in that menu. Now I'd like it to be set back to the default. Perhaps it is. I have no idea. I would like to know the software default for this menu.


Alexey Pasumansky

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Re: align photos default settings
« Reply #3 on: March 14, 2021, 01:11:08 PM »
Hello DCK,

Use High accuracy and 40 000 / 4 000 for key / tie point limits.
Best regards,
Alexey Pasumansky,
Agisoft LLC

DCK

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Re: align photos default settings
« Reply #4 on: March 14, 2021, 05:48:54 PM »
Thanks, Alex.

Adam_de_Kaminski

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Re: align photos default settings
« Reply #5 on: December 27, 2022, 02:28:53 PM »
Great explanation of the setup!
Photogrammetry with Nikon D610 and DJI Mini 2 and sometimes laser.
Website with projects: https://www.dekaminski.com