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General / Orthomosaic is mirrored when importing it in GIS or CAD
« on: June 24, 2025, 12:25:11 PM »
Hello. I have a problem when importing an orthomosaic in QGIS and AutoCad. I view it perfectly fine in Metashape but it gets mirrored when importing it in other programs.
Metashape Pro Version 2.2.1 (build 20641)
The project is to produce an unwrapped orthomosaic of a tunnel (no need for road surface). See Pic.01
My workflow:
1) Collect photos and CPs on the field.
2) Align photos
3) Enter CPs to georeference the project (local coordinates) CP coordinates are measured in such a way that the produced model has the Tunnel Axis aligned with Metashapes Y axis. It also places the model according to the Chainage of the Tunnel.
4) Apply gradual selection and optimize the alignment.
5) Build a tiled model.
6) Define Axis and Radius of the tunnel with markers.
7) Build Orthomosaic by using Cylindrical Projection and using the Markers to define the axis and Projection Origin. Because it's a Tunnel i check the option "Interior Projection". As surface i choose Tiled Model and transfer model texture. See Pic.02
Export the Orthomosaic
The orthomosaic looks perfect for the needs of this project. See Pic.03
Preview inside windows explorer looks correct.
9) Importing the orthomosaic in Civil 3D and the orthomosaic is mirrored along Y axis. See Pic.04 The same happens when is imported in QGIS.
Why it does that and how can i correctly produce such unwrapped orthomosaic.
Metashape Pro Version 2.2.1 (build 20641)
The project is to produce an unwrapped orthomosaic of a tunnel (no need for road surface). See Pic.01
My workflow:
1) Collect photos and CPs on the field.
2) Align photos
3) Enter CPs to georeference the project (local coordinates) CP coordinates are measured in such a way that the produced model has the Tunnel Axis aligned with Metashapes Y axis. It also places the model according to the Chainage of the Tunnel.
4) Apply gradual selection and optimize the alignment.
5) Build a tiled model.
6) Define Axis and Radius of the tunnel with markers.
7) Build Orthomosaic by using Cylindrical Projection and using the Markers to define the axis and Projection Origin. Because it's a Tunnel i check the option "Interior Projection". As surface i choose Tiled Model and transfer model texture. See Pic.02
Export the OrthomosaicThe orthomosaic looks perfect for the needs of this project. See Pic.03
Preview inside windows explorer looks correct.
9) Importing the orthomosaic in Civil 3D and the orthomosaic is mirrored along Y axis. See Pic.04 The same happens when is imported in QGIS.
Why it does that and how can i correctly produce such unwrapped orthomosaic.