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I'm trying to reproject a DWG file from AGD 1966 ISG 56 (EPSG:102077) to GDA2020 Zone 56 (EPSG:7856). I'm using the original DWG as a template to preserve layers, colours, line styles, etc.

I've set up a workbench to handle the reprojection and all the data looks good and in the correct location when viewed at the final step in the inspector:

However, when I open the output DWG, most of the data is correctly reprojected (matching what I see in the Inspector) but some features remain in the original coordinate system, thus showing up in Antarctica:

Zoomed in at the portion in Antarctica:

I've tried several troubleshooting steps:

  • A simple read/write workbench
  • Writing to DXF instead of DWG
  • Using the RealDWG reader/writer
  • Using default DWG reader settings (no customisation)

I saw this question is similar to mine, but I didn’t have any luck writing to dxf instead:

None of these things have fixed the issue. It seems to mostly affect text features, although some text is reprojected correctly, so I'm really not sure what is causing it! I haven’t been able to identify a consistent pattern or reason why certain features remain in the wrong CRS. I've also experienced this with a few CAD files now, so it's not limited to just this one.

Has anyone encountered this before or have suggestions on what might be causing it?

hmmmm - it could be there are some hidden autocad_* attributes which are being used instead of the geometry or in conjunciton with the geometry. Also check this link out, looks like there are a few gotchas you might need to look out for

https://docs.safe.com/fme/html/FME-Form-Documentation/FME-ReadersWriters/acad/Text_Entities.htm

Thank you ​@virtualcitymatt - I’ve got it working now!

I looked into docs and initially removed just the autocad_alignment attributes after seeing the note about these causing incorrect placement when projecting. That fixed most of the text, however some was still not projecting correctly.

I then ended up bulk removing all of the autocad_* attributes as the final step in workbench before writing out and it worked! The output still looks correct due to the dwg template and is now all in the right place 🙂

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