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Thread: Converting map projections

  1. #1

    Default Converting map projections

    Hello

    I am new here. I have, in the past, loved drawing maps for RPG settings. I recently found a maps of a water covered Venus, which I think would make a great map for an RPG setting, as well as it being semi-real.

    http://ahstat.free.fr/2-topography/a...0/venus965.png

    To my ignorant eyes it looks like a equidistant cylindrical projection, and I would rather have a pseudocylindrical projection.

    Does anyone know of any software or online service that could do this?

    Cheers


    Padster

  2. #2
    Guild Novice Guild Supporter Chip's Avatar
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    Default

    The most powerful program you could probably use for this is ArcMap by ESRI, but most likely you don't have access to that program. You could try an open source GIS like Grass GIS or QGIS. It's not going to be perfect, as transforming an image is a lot jankier and confusing than projecting a set of coordinate data.

    Maybe that helps,
    your friendly neighborhood GIS student

  3. #3
    Guild Artisan
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    Yes that is a cylindrical projection.
    Wilbur and Fractal Terrain can both transform a cylindrical projection in any other projection.

  4. #4
    Software Dev/Rep Hai-Etlik's Avatar
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    G.Projector is probably the easiest software to do this in. It only works with normal equidistant cylindrical input, which you seem to have. As Fuzzycellos pointed out though, reprojecting a symbolized map will produce distortion of the symbols. In this case coastline will vary in width.

  5. #5

    Default

    That is great. Thanks for the feedback.

    I suppose it is a monster job to convert an image into a set of coordinates? How would I go about that?

    Cheers


    Padster

  6. #6
    Guild Expert johnvanvliet's Avatar
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    gdal +proj4
    http://www.gdal.org/gdal_utilities.html

    or
    just proj 4
    http://trac.osgeo.org/proj/


    or if you do not mind something that is not very accurate
    and you need to guess on settings
    ( BUT it dose have it's uses and is GOOD in a pinch)
    MMPS
    http://www.users.globalnet.co.uk/~arcus/mmps/

    My self , seeing as i already use some rather specialized software . I use that
    ISIS3
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