custom focal function on rasterstack

Ruben:

Give rasterEngine, within the spatial.tools package a whirl.  Here's
the tutorial for it (some things are bit out of date, but this does
cover the focal analyses):

http://publish.illinois.edu/jgrn/software-and-datasets/rasterengine-tutorial/

Note there are examples of focal windows towards the end of the
tutorial.  If you use a parallel engine (e.g. sfQuickInit() ) it will
run your process in parallel -- I've found a significant speedup using
focal windows in parallel mode.

--j

On Fri, Mar 14, 2014 at 10:10 AM, Ruben Van De Kerchove

Hi,

I have rasterstack consisting out of 252 rasters (hyperspectral image) for
which I want to calculate the mean distance to the centroid in a 3*3(*252)
moving window. As the focal function (from the raster package) only works
for rasters, I am currently using the getValuesBlock function (in a loop),
but this seems rather slow. Therefore, I was wondering, if there is a more
efficient way to tackle this problem.

Best,
Ruben

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