Hi Matthew, It would be useful to see what your source image looks like. I have an image that covers essentially global extents, and which is in EPSG:4326. I did a reprojection using gdalwarp in GDAL 1.6.1:
$ gdalwarp -s_srs "EPSG:4326" -t_srs "+proj=moll +lon_0=0" infile outfile The results that look reasonable, or at least I see no horizontal flipping or other artifacts in the result. Any chance you could share a reduced resolution version of the data with the list? Roger -- On Sun, Jul 5, 2009 at 11:04 AM, Matthew Vavrek <mattvav...@hotmail.com>wrote: > I have just started trying to use gdalwarp and gdal_translate to reproject > some world maps. I have managed to achieve some limited success with some > projections, but I seem to get strange results with my images, especially > with Mollweide. The Molleweide gives a horizontally flipped image, sometimes > with an unreversed strip in the middle, and the top and bottom of the image > seem stretched rather than compressed as I would expect. The code I used to > translate is: > > gdalwarp -of GTiff -s_srs EPSG:4326 -t_srs EPSG:54009 input.tif > moll-output.tif > > I also tried with -t_srs '+proj=moll +lon_0=0'. > My initial image was a plain jpg, and I have tried creating a world file > and using gdal_translate to georeference the image. I also tried using: > > gdalwarp s_srs EPSG:4326 t_srs EPSG:4326 input.tif output.tif > > to see if that would help, which it oddly did for some of the other > projections I was trying (like polyconic). I have even tried different world > map images, yet still get these strange results. I can't figure out what I'm > doing wrong to get these totally bizarre images, so any help would be > appreciated. > > Thanks > Matthew > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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