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Author Topic: Tie points checkbox disabled in Merge chunk workflow  (Read 1970 times)

aniket@aus.co.in

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Tie points checkbox disabled in Merge chunk workflow
« on: October 30, 2023, 11:43:16 AM »
Merge Tie Points checkbox is disabled even when chunks have tie points. My understanding of it is that Merge Tie Points option requires key points to be present in the chunks that you are planning to merge.
I have tried with the following:
Merging chunks that were processed till Align Photos
Merging chunks that were processed till Dense Cloud
In both cases, Merge Tie Points checkbox was disabled.
Why is this happening and how to enable it?

Alexey Pasumansky

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Re: Tie points checkbox disabled in Merge chunk workflow
« Reply #1 on: October 31, 2023, 02:52:01 PM »
Hello Aniket,

Merge Tie Points option is not available if there are no key points stored in the chunks being merged, as it wouldn't be possible to match tie points in different chunks.
Best regards,
Alexey Pasumansky,
Agisoft LLC

aniket@aus.co.in

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Re: Tie points checkbox disabled in Merge chunk workflow
« Reply #2 on: November 02, 2023, 06:16:26 PM »
Hi Alexey, thanks for the quick response.
I have tie points & key points in both the chunks I'm trying to merge, even then the Merge Tie Point checkbox is disabled.

Alexey Pasumansky

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Re: Tie points checkbox disabled in Merge chunk workflow
« Reply #3 on: November 02, 2023, 07:05:58 PM »
Hello Aniket,,

What version of Metashape you are using? I will check then, maybe the behavior was different in older versions.

Also please specify, what is the point of merging tie points for your task?
Best regards,
Alexey Pasumansky,
Agisoft LLC

surya-aereo

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Re: Tie points checkbox disabled in Merge chunk workflow
« Reply #4 on: January 09, 2024, 11:08:36 AM »
Hi Alexey,


Continuing on what was said in the previous post, we found out the reason that metashape was not showing the option of merging tie points. It was because, in our settings we had not enabled the `Keep Key Points` options checked.

What I want to know is for what reasons would one actually select the option to merge tie points?
Is there any benefit to using that while merging?

From my understanding merging chunks automatically adds the two tie points together, and on generating a dense cloud -> dem -> ortho from this, (for 2 chunks with 100 images each), there doesn't seem to be any visual difference. However, there is a difference in number of points which i assume is due to the removal of any duplicate tie points?


Thanks!
« Last Edit: January 09, 2024, 11:10:38 AM by surya-aereo »