[gdal-dev] NODATA value in rasters

[Frank Warmerdam]

David,

Some formats support identifying a particular pixel value as nodata
and some do not.
When they don't and you write nodata, we usually try to store the
information in an
.aux.xml file (auxilary metadata) which at least GDAL based applications would
recognise.

Best regards,
Frank

On Fri, Apr 13, 2012 at 12:07 PM, David Strip <gdal at stripfamily.net> wrote:
> What data formats besides geotiff  support a NODATA value? Is there a
> uniform GDAL approach to determining the NODATA value or otherwise
> determining if a pixel is a NODATA pixel? I know that this value is stored
> in a geotiff tag, but that won't work for other formats.
>
>
>
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