Agisoft Metashape
Agisoft Metashape => General => Topic started by: DCK on March 13, 2021, 12:45:36 AM
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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.
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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
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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.
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Hello DCK,
Use High accuracy and 40 000 / 4 000 for key / tie point limits.
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Thanks, Alex.
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Great explanation of the setup!