[R-sig-Geo] GRASS with R and distances between polygon edges
dgoliche at sclc.ecosur.mx
Mon Oct 30 17:09:49 CET 2006
I have a follow up question regarding moving old (R <2.4) sp objects to
R 2.4. It is indeed easy using GRASS as an intermediary with spgrass6.
But one of my students has installed GRASS with the QGIS interface
rather than running GRASS under Cygwin. He wanted to do the same.
I tried with him and quickly got R to communicate with GRASS by simply
changing the first lines of system to read .....
function (command, intern = FALSE, wait = TRUE, input = NULL,
show.output.on.console = TRUE, minimized = FALSE, invisible = FALSE)
But we still couldn't get spgrass6 to import and export raster layers
even after fiddling with the code to get rid of cygpath etc. Perhaps
Roger has a fix? It would be useful.
Also while posting, can anyone suggest a way of measuring the closest
distance between disjunct polygons in R (forest fragments)? Its easy to
use centroids in spdep, but we were interested in the distances between
Dr Duncan Golicher
Ecologia y Sistematica Terrestre
Conservación de la Biodiversidad
El Colegio de la Frontera Sur
San Cristobal de Las Casas,
Email: dgoliche at sclc.ecosur.mx
Tel: 967 674 9000 ext 1310
Fax: 967 678 2322
United Kingdom Skypein; 020 7870 6251
Skype name: duncangolicher
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