I'm new to this whole mapmaking thing (and the forums!) and ran into a question I'm hoping you all can help me out with. Hopefully this all makes sense, but I've been trying to figure out how to take a large equirectangular world map, export a small region of it for working on details with relatively little distortion, and then reimport that region / reproject it back to equirectangular so it can be reintegrated into the large map. Using a map of Earth to practice, I could successfully take the equirectangular projection, use Wilbur to convert that to an orthographic projection centered on Iceland (a place with lots of distortion in the equirectangular map), and export the much less distorted regional map of Iceland. Where I ran into trouble was on the reverse step of getting Iceland back to equirectangular...

I could open the regional map up in Wilbur and set the latitude and longitude limits to their values for the regional map. My problem is that when I try to project this as an equirectangular projection, the output is a blank screen. Things seem ok if I choose orthographic and the map shows up roughly as expected, but I can't for the life of me get equirectangular to work. Is what I'm doing possible and I'm just messing something up? Or is this whole approach wrong?