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For read access the easiest way to get ECW support is through the OSGeo4W installer. Do an Advanced install, and in the libs section enable the gdal-ecw library.


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I gather from a few articles that support for ECW (a highly proprietary format) heavily favours Windows installations: http://www.surfaces.co.il/qgis-on-windows-with-ecw/ I'm not sure how to get the ERDAS support files for Linux, but that's what you'll have to do as noted in the blog post referenced above.


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You are selecting your image in the tool dialogbox (not just in the layer TOC? I ask because, unlike other Grass tools, it is not quite so obvious. Alternatively you could use gdalinfo. You get to this tool via Raster->Miscellaneous->Information. Select your raster and then click the little yellow pencil to edit the gdalinfo commandline options. It ...


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It's highly inefficient to merge mosaic using gdal merge. Instead, make a VRT (Virtual Dataset) and convert it to your favourite format.



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