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 > _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
