[Qgis-user] Cell Statistics in QGIS

[Leo Kris Palao]

Hi Micha and Victor,

Thanks for your reply. I will try R.Series module of GRASS. I think this is
what I am looking for...

-Leo
On Apr 14, 2014 5:57 PM, "Victor Olaya" <volayaf at gmail.com> wrote:

> Using the Processing raster calculator to sum up layers should
> correctly handle no-data values, and leave a no-data value in those
> cells for which one of such values appears in the sum.
>
> 2014-04-14 11:29 GMT+02:00 Micha Silver <micha at arava.co.il>:
> >
> > On 14/04/2014 06:19, Leo Kris Palao wrote:
> >
> > Hi ALL QGIS users,
> >
> > Good day!
> >
> > I want to calculate the sum of the raster layers, but I want to ignore
> the
> > no data values in the calculation. This is similar to cell statistics
> > (spatial analyst) enable the Ignore NoData in calculations (optional) in
> > ArcGIS.
> >
> >
> > You can choose the GRASS module "r.series". Regarding no data cells, they
> > are handled as follows (from the manual page):
> >
> > Without -n flag, the complete list of inputs for each cell (including
> NULLs)
> > is passed to the aggregate function. Individual aggregates can handle
> data
> > as they choose. Mostly, they just compute the aggregate over the non-NULL
> > values, producing a NULL result only if all inputs are NULL.
> >
> > So if you use "method=sum" you'll get an output raster which sums all non
> > null input cells.
> >
> >
> >
> > So far I am doing all my process in QGIS (batch processing is great in
> the
> > processing toolbox). This is the only step that I am using ArcGIS
> because I
> > cannot find the right tool in QGIS.
> >
> > Thanks in advance for any help.
> >
> > -Leo
> >
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> >
> >
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