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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