Hi, Another option is make a subset by mask with GDAL using three algorithms: gdal_translate, gdal_rasterize and gdalwarp.
1 - Original Full Raster + ROI in shapefile format: http://osgeo-org.1803224.n2.nabble.com/file/n5954709/ftolls0.png 2 - Generate a Raster Black with gdal translate: In Ftools prompt, past a code below to generate a black raster (replace de subdirectories): gdal_translate D:\GDAL\LS5_20100208_216_075_RGB.tif D:\GDAL\LS_SCALE.tif -scale 0 255 0 0.01 http://osgeo-org.1803224.n2.nabble.com/file/n5954709/ftools4.png * LS5_20100208_216_075_RGB.tif is the original raster. * LS_SCALE.tif is the name I gave to the opaque raster. 3 - Create a Raster Mask with gdal_rasterize: Paste new commandline in Ftools prompt: gdal_rasterize -b 1 -b 2 -b 3 -burn 255 -burn 255 -burn 255 -l VETOR_SHP D:/GDAL/VETOR_SHP.shp D:/GDAL/LS_SCALE.tif http://osgeo-org.1803224.n2.nabble.com/file/n5954709/ftools2.png 4 - Finally, generate the image subset with gdalwarp: gdalwarp D:/GDAL/LS_SCALE.tif -srcnodata "255" D:\GDAL\LS5_20100208_216_075_RGB.tif http://osgeo-org.1803224.n2.nabble.com/file/n5954709/ftools3.png The NoDATA value is zero. Since the algorithm gdalwarp not generate a third image, you must delete any .AUX and .RRD files after unning this command. This prevents the GIS (ArcGIS, Quantum GIS, etc) remains continuously displaying the entire image in the editing area. Full article in my blog Processamento Digital: http://processamentodigital.blogspot.com/2011/01/recorte-irregular-em-arquivos-raster.html http://processamentodigital.blogspot.com/2011/01/recorte-irregular-em-arquivos-raster.html Regards, _________________ Jorge Santos Téc. em Geodésia e Cartografia http://processamentodigital.blogspot.com/ http://processamentodigital.blogspot.com/ http://twitter.com/jpsantos2002 http://twitter.com/jpsantos2002 Skype: jorgepsantos2002 -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/Cropping-raster-by-vector-files-tp5271977p5954709.html Sent from the GDAL - Dev mailing list archive at Nabble.com. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
