[Qgis-user] Writing Python loop for Raster calculator

[Swapnil Chaudhari]

Hi Nathan,

Thanks for your response. In fact I was reading your blog yesterday itself.
gdal_calc.py may be of my help. I will explore that option.

I would be happy to receive a little more elaboration on how to write shell
script for automating this calculation for entire directory? I am aware
that you have already written it in on your blog at DEM generation.
However, if you can suggest how to write shell script specific to once need
would be really great.

Thanks a ton!

Swapnil
  o__
 _> /__
(_) \(_)....... live healthy



On Fri, Apr 6, 2012 at 12:58 PM, Nathan Woodrow <madmanwoo at gmail.com> wrote:

> You can try gdal_calc.py
>
>
> http://smathermather.wordpress.com/2011/12/01/gdal_calc-py-raster-calculator-using-numby-functions/
>
> - Nathan
>
> On Fri, Apr 6, 2012 at 4:35 PM, Swapnil Chaudhari <swapsslan at gmail.com>wrote:
>
>> Dear QGIS User Team,
>>
>> I have sets of grid files, corresponding to monthly mean temperature for
>> few years.
>>
>> I am working on scaling the raw data and modifying the extent of output
>> file from -180,180,-90,90 to -180,180,-60, 90.
>>
>> The process of doing this with Raster Calculator is straight and very
>> simple, where you have to give raster calculation expression, output extent
>> and name of output with its format.
>> The scaling equation for doing so e.g. is, (cru_tmp_clim_1961-1970_05 at 1
>> *0.51)-85
>>
>> Although very simple, its very time consuming since I have data for
>> around 6 to 7 dacads.
>>
>> I would be very glad if some one can help me find the python script for
>> doing this in loop. So that I can process whole directory in single go.
>>
>> In addition to that, I would also request you to inform mannaul, guide to
>> learn python scripting for simple raster and vector operations.
>>
>> You efforts in helping with this is much appreciated.
>>
>> Thank you very much.
>>
>> Best,
>>
>> Swapnil
>>   o__
>>  _> /__
>> (_) \(_)....... live healthy
>>
>>
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20120406/71eacda5/attachment.html>