On Thu, 5 Nov 2009, Felipe Carrillo wrote:
Hi all: I'm brand new to GRASS and this list and just wanted to see if
someone could point out to what I need to synchronize R and GRASS. I
already downloaded GRASS 6.3, spgrass6 and dependencies and at my first
attempt something is happening but I can't quite see a way to import
data into R or run commands from R. I ran into the code below yesterday
but I can't figure out how to run it from R.
I replied offlist to a mail directly to me suggesting to Felipe that he
post (done), that he read the PDFs shipped with spgrass6 (he hasn't), and
to decide which mode he needs - R within GRASS or R freestanding using
GRASS in a temporary location (hasn't done that either), then read the
help pages (unknown).
system.file("doc", package="spgrass6")
shows where the PDFs live in an installed package.
He could also watch:
http://spatial.nhh.no/wun09/wun_grass.swf
which shows the use of the interface in a GRASS 6.3 Windows setting, but
before the important update to replace the direct use of system() with
execGRASS() at the user level.
I think that until these recommendations are followed, he's unlikely to
gain from any further advice. I don't have time to handhold. He has only
said that he is using GRASS 6.3, but not his system, or R's sessionInfo().
Roger
I tried: system("g.region rast=elevation.dem") but I get an error
message. Thanks
# set region:
g.region rast=elevation.dem
# extract some random points from an elevation dataset
v.random out=rs n=300
# create attribute table:
v.db.addtable map=rs columns="elev double"
# extract raster data at points
v.what.rast vect=rs rast=elevation.dem column=elev
# simple display:
d.rast elevation.dem
d.vect rs size=4
# start R
R
Felipe D. Carrillo
Supervisory Fishery Biologist
Department of the Interior
US Fish & Wildlife Service
California, USA
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [email protected]
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