convert from spatstat to sp

There is; if your question is about converting an object of class im
(spatstat) to an object of class SpatialGridDataFrame (sp), it is in
package maptools:

library(spatstat)
whitenoise <- im(matrix(rnorm(1200),30,40))
library(maptools)
x = as(as(whitenoise, "SpatialGridDataFrame"), "SpatialPixelsDataFrame")

if your polygons are in SpatialPolygons object pol, then

sel = overlay(x, pol)
x.sel = x[!is.na(sel),]
spplot(x.sel)

should get you there.

Hello all,

Is there any way to convert from spatstat to sp?

Specifically, I am looking to clip a density plot produced in spatstat
to include only points within a polygon boundary in a shapefile. if
there is a way to clip in spatstat, this would also be acceptable.

Any ideas?

Thanks

pete

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Edzer Pebesma
Institute for Geoinformatics (ifgi), University of M?nster
Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de