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Thread: Map Projection Question

  1. #11
      Sapiento is offline
    Professional Artist Gracious Donor Sapiento's Avatar
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    Question

    Ok, the GIS software is more difficult than I had expected.

    This is one of the poles - flat picture, I don't know which projection. How do I turn it into a flat small band at the southern top of the map? I tried G.Projector, but couldn't load it in pole position.
    Attached Thumbnails Attached Thumbnails Map Projection Question-pole.png  

  2. #12
      waldronate is offline
    Software Dev/Rep Gracious Donor waldronate's Avatar
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    Default

    http://www.jhendor.de/tutorials/cc2-ft.pdf describes how Ralf Schemann over at ProFantasy used a little toy I wrote a long time ago to do the sort of thing that you're asking. You would be particularly interested in the "Converting the image to an equirectangular projection" step, I'm guessing.

    I haven't had a pressing need to use one of the projection tools out there, so I can't help you much with those, I'm afraid.

    This image shows what the UI for ReprojectImage would look like to unproject a stereographic image
    Map Projection Question-polea.jpg

    And this is a 4096x2048 export from those settings.
    Map Projection Question-pole1.png

    Other projections are pretty straightforward.

    ReprojectImage is an ancient tool, but it sort of works for this kind of thing.

  3. #13
      Sapiento is offline
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    Excellent! Thank you, waldronate, that's exactly what I needed.
    Another proof of the excellent support and help in this forum. I took the freedom to donate a few bucks to the site.

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