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Step 1 Make bit rasters for each of the unique classes. This can be a 1-band rasters for each class, or a single raster with a band for each class (e.g. GeoTIFF). If using GTiff, you can use the creation option NBITS=1 to conserve space. You may also want to consider twobit rasters to store three-valued logic where the third (e.g. 2) is NODATA, which would ...

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