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I'm looking to convert a unsigned integer grid to a short integer grid for use in TauDEM. The unsigned integer grid has values ranging from 0 - 4.

  • What have you tried so far? If there's only 5 discrete values, a 4-bit image would hold it, in addition to 8-bit and 16-bit. ("short integer" is 16-bit", "integer is 32-bit"; "8-bit is "byte", and 4-bit is "nibble") – Vince Mar 7 '16 at 16:48
  • There is actually only 2 discrete values now (0 and 1). This particular analysis tool within TauDEM specifies the input needs to be a short integer grid, although i've used this 8 bit unsigned integer and it seems to have worked. Is there a way to convert it to short integer 16 bit to see if i get the same results? Thanks – Steven Mar 7 '16 at 22:13
  • Again, what have you tried? If you haven't tried a Save As or Export, then you weren't ready to post a question. – Vince Mar 7 '16 at 22:43
  • Doing Data > Export Data > Format: GRID gives a 32bit pixel depth. – Steven Mar 7 '16 at 22:59
  • From Catalog, right-clicking on the image offers Export -> Raster as Different Format, which pulls up the Copy Raster UI, which has a "Pixel Type (optional)" pull-down – Vince Mar 8 '16 at 1:12
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TauDEM uses three grid data types internally. These are

  • FLOAT_TYPE, corresponding to GDAL GDT_Float32
  • SHORT_TYPE, corresponding to GDAL GDT_Int16
  • LONG_TYPE, corresponding to GDAL GDT_Int32

It uses the method GDALRasterIO to read from whatever grid the user provides into the type that corresponds to the variable being used. According to http://www.gdal.org/gdal_tutorial.html this method automatically takes care of data type conversions (which is why it was chosen). So you should not need to convert an unsigned integer grid into a short integer grid to use in TauDEM.

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