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Author Topic: Cylindrical UAV Mapping (or Unwrap)  (Read 797 times)

Photo

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Cylindrical UAV Mapping (or Unwrap)
« on: January 06, 2023, 05:47:09 PM »
Hello everyone,

I would be very happy if someone could help me. I've been trying to unwrap the reveal of a bridge for days. Unfortunately without success. :'(
My model needs to stay georeferenced, so I'm not allowed to rotate the model (need scale). I have attached a few screenshots. could someone tell me the best way to do this or where can I put my markers so that I can do it correctly. Thanks in advance.

Cheers
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Kiesel

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Re: Cylindrical UAV Mapping (or Unwrap)
« Reply #1 on: January 09, 2023, 12:35:56 PM »
Hallo photo,

According to the Metashape help:
Quote
Metashape allows using one of the following projection types: Geographic, Planar or Cylindrical

Metashape can unroll cylinders only.
Your brigde looks more like a three-part basket arch so you have three cylindrical parts. If you can manage to split it in three parts (2 with the same smaller radius and one with a bigger radius in the middle part) it should be possible to get orthomosaics of them and mount them afterwards.

Another possibility is to do it in CloudCompare with "Unfolding a cloud along a polyline"
http://www.cloudcompare.org/doc/wiki/index.php?title=Extract_Sections#Unfolding_a_cloud_along_a_polyline
and then reimport it in Metashape and make the orthomosaic out of it.

Hope it helps

Kiesel
« Last Edit: January 09, 2023, 12:38:07 PM by Kiesel »