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Found it: Choose "Metada" (right click -> Metadata) Enter the no data value in Edit -> Set/Clear No Data Values -> Set no data (my case -9999) Enter the no data value in Edit -> Compute Pyramid Layers/Statiscs -> Ignore Value (my case -9999) and change to 1 in Max Skip Factor X/Y (because I use UTM and meters) Right click in 2D View ...


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20Gb is not that big, have a read through Paul Ramsey's GeoTiff Compression for Dummies and see if that answers your question.


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