Hi, I'm new to gdal, geotiffs & stuff, so sorry if this all seems obvious. I've been trying to reproject a geotiff from "+proj=utm +zone=29 +ellps=intl +units=m +no_defs" (European 1950, zone 29 - Portugal) to WGS84.
gdalwarp -s_srs "+proj=utm +zone=29 +ellps=intl +units=m +no_defs" -t_srs "+proj=latlong +datum=WGS84" map.tif map3.tif The original file is 5366 x 3387 but ... the reprojected file is 5695 x 2863 With the naked eye I can't see much change. Is this behaviour normal? Concerning the original file, it was built with gcp's in gdal_translate and then warped in the original projection. Maybe this isn't enough? In the ozi2geotiff.py script I see he does a second translate with several creation options (-co) for tiled, block(x,y)size, compress and predictor. As well as some other stuff with convert, listgeo and geotifcp. Thanks, Erik.
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