Excellent! Thanks very much for the info, and links to the docs. -- On Sat, Oct 18, 2008 at 12:40 AM, Klokan Petr Přidal <[EMAIL PROTECTED]>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 <[EMAIL PROTECTED]> > 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 > >> -- > >> > >> > >> ------------------------------------------------------------------------ > >> > >> _______________________________________________ > >> gdal-dev mailing list > >> [email protected] > >> http://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > _______________________________________________ > > gdal-dev mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/gdal-dev > > >
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