[gdal-dev] nodata value assigned via script

[Roger André]

Excellent!  Thanks very much for the info, and links to the docs.
--

On Sat, Oct 18, 2008 at 12:40 AM, Klokan Petr Přidal <klokan at klokan.cz>wrote:

> Hi Roger,
>
> Matt answered the question already...
>
> The official documentation for handling masks and nodata values in GDAL is:
> http://trac.osgeo.org/gdal/wiki/rfc15_nodatabitmask
>
> and the complete python interface is tested in this file:
> http://trac.osgeo.org/gdal/browser/trunk/autotest/gcore/mask.py
>
> Klokan
>
> On Sat, Oct 18, 2008 at 12:57 AM, Matt Wilkie <matt.wilkie at gov.yk.ca>
> wrote:
> > Wow, a python question I actually know the answer too!  :)
> >
> > From python you can use "band.SetNoDataValue( float(null_value) )". For
> this
> > in context see this tiny utility:
> >
> http://maphew.googlecode.com/svn/trunk/gis/gdal_extras/bin/gdalsetnull.py
> >
> > And the doc on this function:
> >
> http://www.gdal.org/classGDALRasterBand.html#c6f081d253dee55c372e54cfdd8f05a6
> >
> > cheers,
> >
> > matt wilkie
> > --------------------------------------------
> > Geographic Information,
> > Information Management and Technology,
> > Yukon Department of Environment
> > 10 Burns Road * Whitehorse, Yukon * Y1A 4Y9
> > 867-667-8133 Tel * 867-393-7003 Fax
> > http://environmentyukon.gov.yk.ca/geomatics/
> > --------------------------------------------
> >
> >
> > Roger André wrote:
> >>
> >> Hi,
> >>
> >> I'm getting raster data written by different people who can't seem to
> use
> >> the same nodata values.  I'm reading the data files via the Python API
> to
> >> GDAL, and doing various calculations on the data values, then writing
> new
> >> rasters with the results of my calculations.  Is there a "nodata" value
> that
> >> I can assign to a pixel that the gdal utilities will recognize as such
> later
> >> on?  All my other values are 32-bit floating point values, so I'm not
> sure
> >> what value to assign.
> >>
> >> Thanks.
> >>
> >> Roger
> >> --
> >>
> >>
> >> ------------------------------------------------------------------------
> >>
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>
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