Converting map projections

[Padster]

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

[Chip]

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

[Deadshade]

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

[Hai-Etlik]

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.

[Padster]

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

[johnvanvliet]

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