How to achieve the boundary of a polygon?

Thank you very much. It works for me now. Previously I only looked at the
spatstat package.

Shaofei

-----Original Message-----
From: Edzer Pebesma [mailto:edzer.pebesma at uni-muenster.de] 
Sent: Tuesday, September 08, 2009 1:09 AM
To: Shaofei Chen
Cc: r-sig-geo at stat.math.ethz.ch
Subject: Re: [R-sig-Geo] How to achieve the boundary of a polygon?

Have you had a look at spsample in package sp?

Hi,

I want to randomly sample some points within a polygon. After reading the

bounday file to the SpatialPolygonsDataFrame, I found that I can only sample
them in the rectangular containing the polygon based on bbox.

bound <- readShapePoly("bound.shp") 
plot(bound)
rand.points=rpoint(100,

win=as.owin(c(bound at bbox[1],bound at bbox[3],bound at bbox[2],bound at bbox[4])))

Can you help me sample them inside the boundary?
Thanks!

Best,
Shaofei
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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.springer.com/978-0-387-78170-9 e.pebesma at wwu.de