Hi,<br><br>I'm new to gdal, geotiffs & stuff, so sorry if this all seems obvious.<br>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.<br>
<br>gdalwarp -s_srs "+proj=utm +zone=29 +ellps=intl +units=m +no_defs" -t_srs "+proj=latlong +datum=WGS84" map.tif map3.tif<br><br>The original file is 5366 x 3387<br>but ... the reprojected file is 5695 x 2863<br>
<br>With the naked eye I can't see much change. Is this behaviour normal?<br><br>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. <br>
<br>Thanks, <br>Erik. <br>