[gdal-dev] nodata value assigned via script

[Klokan Petr Přidal]

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
> --------------------------------------------
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> --------------------------------------------
>
>
> 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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