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
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