Hi Josh,

How about you play R with GRASS (spgrass6 package) or SAGA (RSAGA package)?
May be you will get better results, mainly you can do other geoprocessing on
your data.

Cheers

milton
brazil=toronto

On Thu, Jul 9, 2009 at 1:20 PM, Josh London <josh.london@noaa.gov> wrote:

> Hello
>
> We are looking to mimic, in R, the slope (max magnitude difference between
> a cell and its neighbors) and aspect (direction of maximum magnitude
> difference) functions found in ESRI's Spatial Analyst package. We were just
> about to code up the slope function but thought I would make sure we weren't
> re-inventing any wheels already out there.
>
> Thanks
> Josh
>
> --
> Josh M. London, PhD
>
> Wildlife Biologist
> Polar Ecosystem Program
> National Marine Mammal Lab
> Alaska Fisheries Science Center, NOAA Fisheries
> Seattle, WA
>
> The contents of this message are mine personally and do not
> necessarily reflect any position of the Government or the
> National Oceanic and Atmospheric Administration.
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo@stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>

	[[alternative HTML version deleted]]

