Thanks for the suggestions so far regarding the use of GRASS or SAGA.
We have considered those options but SAGA doesn't appear available for
MacOS. My understanding is that spgrass6 is more for accessing R
code/functions from within GRASS vs accessing GRASS functions from
within R. We have all our other analysis coded up in R, and just need
these functions to do one part of a bigger process. Maybe I'm
misunderstanding how to use R and GRASS together. I'll do some further
research.
Thanks again
Josh
Josh London 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.
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