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I just installed QGIS and am new to it. I want to use the raster calculator, but after assigning a name to the output layer QGIS tells me "Invalid Data Source" and "filename.tif is not a valid or recognized raster data source". What's wrong?

Jan

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What is your OS and which version is GDAL and QGIS? What is the format of the input raster? –  SS_Rebelious Aug 29 '12 at 9:33
    
If possible please also link a sample of your input data. –  Giovanni Manghi Aug 29 '12 at 13:21
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