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spatstat questions
2 messages · Milton Cezar Ribeiro, Roger Bivand
On Sun, 9 Dec 2007, Milton Cezar Ribeiro wrote:
Hi all, Is there a mailing list for spatstat R package?
The website is http://www.spatstat.org (seems to be down for me, but that's probably me); the maintainers also read this list.
Another question: Can I find some ebooks on Spatial Pattern Analysis to be downloaded? Finally, how can I use a shapefile as "mask" on spatstat? I read the polygon using maptools::read.shape function and now I would like to use this shape as mask to define the boundary of my point pattern data.
Don't use read.shape(), it returns a raw object that is difficult to
handle. An example with readShapePoly:
library(maptools)
library(spatstat)
xx <- readShapePoly(system.file("shapes/sids.shp", package="maptools")[1])
.spatstat_check <- FALSE
NC <- as(as(xx, "SpatialPolygons"), "owin")
plot(NC)
class(NC)
pts <- runifpoint(1000, NC)
plot(pts, pch=16, cex=0.5, add=TRUE)
The .spatstat_check is to turn off topology checking - please use only
when necessary. In general the internal structures expect polygons not to
touch or intersect, but the North Carolina counties do touch, so I have
turned off the check.
There are more notes on Dylan Beaudette's site at:
http://casoilresource.lawr.ucdavis.edu/drupal/node/319
Hope this helps,
Roger
Kind regards Miltinho Brazil.
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: Roger.Bivand at nhh.no