On Fri, 28 Oct 2011, toke wrote:
Hi Roger Thank you for your fast responds
Here are the GRASS command. Which works
v.distance from=recrea_h to=area_b1 from_type=centroid to_type=area dmax=1
upload=to_attr column=area_b1 to_column=value
It should be similar to this in R using the spgrass6 package
execGRASS("v.distance",from="recrea_h", to="area_b1",
from_type="centroid", to_type="area", dmax=as.integer(1),
upload="to_attr", column="area_b1", to_column="value")
the "84 categories with no nearest feature found" is to be expected as they
are more than 1 meter away. What I want to do, in this command, is to take
information in one polygon and give it to the other polygon given that they
are less than 1 meter away.
In the latest spgrass6, please set an option to display code going out to
GRASS:
set.echoCmdOption(TRUE)
before running execGRASS(), and report whether the GRASS command shown is
identical with or different from the command line version, quoting both
verbatim with all output.
Your figures are no help at all, I'm afraid.
To make progress, please try to reproduce this in spearfish, so that we
are looking at the same thing. Please also report your GRASS platform and
version for reference.
Roger
here is a map of the polygons:
https://www.dropbox.com/gallery/2874375/1/map?h=25554e
https://www.dropbox.com/gallery/2874375/1/map?h=25554e
Cheers Toke
PS. I also tried doing simple distance calculations from a point feature to
area feature. It did not work.
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Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
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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