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Thread: Changing between Equirectangular and Stereographic projections?

  1. #1
    Guild Member AlexSchacher's Avatar
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    Jun 2013
    United States

    Default Changing between Equirectangular and Stereographic projections? [Solved]

    I am trying to map out the basic landmasses of my geofiction world, from which I can zoom in on parts and go into detail with nicer looking maps. But I've hit a wall the past few months that has demotivated me quite a bit, and every time I come back to it I hit the same wall. So hopefully I can get this settled once and for all.

    What I am trying to do is get my "master base map" in Equirectangular projection, from which I can use G Projector to convert to any other projection and base zoomed in maps from there. It works great for my purposes, but as Im sure you all know, G projector only imports Equirectangular, so converting back and forth doesn't work within the program. I am specifically trying to convert to and from Sterographic, so I am able to wrap my head around what I am drawing while mapping the polar regions, convert it back to Equirectangular and stitch the polar region back on. I have tried to use the program ReprojectImage but it doesn't seem to work right, or I am doing something wrong. Here are my images:

    My world that I am starting with, in Equirectangular:
    Click image for larger version. 

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    After converting this to Sterographic on the north pole:
    Click image for larger version. 

Name:	test1.png 
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ID:	63400

    And after using ReprojectImage to try to bring this back to Equirectangular, and pasting it back on the master image. You can see my problem clearly:
    Click image for larger version. 

Name:	failedattempt.png 
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ID:	63402

    So what it comes down to is: How can I switch back and forth between Equirectangular and Sterographic projections smoothly and accurately? And is there an easier way to map out my "master base map"?

    EDIT: Found a solution myself, now I feel stupid for posting this here. I figured out how to use ReprojectImage correctly to bring a Sterographic back to Equirectangular.
    Last edited by AlexSchacher; 05-01-2014 at 06:27 PM.

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