I have an example of a GridCoverage2D that I am trying to create with an signed byte data type. This seems like it should be possible...I create a GridSampleDimension with a SampleDimensionType of SampleDimensionType.SIGNED_8BITS. I then use that GridSampleDimension in the GridCoverageFactory.create call, which for some reason sets the type to SampleDimensionType.UNSIGNED_8BITS.
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On Tue, May 31, 2016 at 11:49 PM, Rob Emanuele <[hidden email]> wrote:
> I have an example of a GridCoverage2D that I am trying to create with an
> signed byte data type. This seems like it should be possible...I create a
> GridSampleDimension with a SampleDimensionType of
> SampleDimensionType.SIGNED_8BITS. I then use that GridSampleDimension in the
> GridCoverageFactory.create call, which for some reason sets the type to
> Tracing through the code, when I originally create the GridSampleDimension,
> a call to TypeMap.getSampleDimensionType is made
> which evaluates to the correct dimension type, based on the range of values.
> During the creation of the GridCoverage2D, the range of values is ignored,
> and we end up at this call of TypeMap.getSampleDimensionType
> which assumes any DataBuffer of TYPE_BYTE must mean unsigned bytes.
> I see this behavior also when reading in GeoTiffs that have unsigned byte
> types; it reads the SampleDimenisonType as a unsigned byte.
> This seems like a bug, can someone please confirm? Or am I missing how to
> detect signed bytes?
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