Map Projection Question

[Sapiento]

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.

[waldronate]

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
polea.jpg

And this is a 4096x2048 export from those settings.
POLE1.png

Other projections are pretty straightforward.

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

[Sapiento]

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.