You'll notice that I wasn't volunteering.. :-)
I guess my main comment re massive datasets, etc. is that once I learned
about the power of generic programming (we've been adapting the Boost
Graph Library to work with GIS), I always feel a great sense of waste
when I see nice algorithms chained pit
> -Original Message-
> From: Edzer J. Pebesma [mailto:[EMAIL PROTECTED]
> Sent: Friday, April 07, 2006 5:30 AM
> To: Tim Keitt
> Cc: Andy Bunn; r-sig-geo@stat.math.ethz.ch; [EMAIL PROTECTED]
> Subject: Re: [R-sig-Geo] (no subject); Clipping/Subsetting Sp objects
On Fri, 7 Apr 2006, Edzer J. Pebesma wrote:
> Andy, Tim, the magic phrases (following your example) are:
>
> clip.sp = SpatialPolygons(list(Polygons(list(Polygon(clip)), ID="clip")))
> fullgrid(x) = FALSE
> x.clip = x[!is.na(overlay(x, clip.sp)),]
> image(x.clip,col="blue",add=T)
>
> the first c
Andy, Tim, the magic phrases (following your example) are:
clip.sp = SpatialPolygons(list(Polygons(list(Polygon(clip)), ID="clip")))
fullgrid(x) = FALSE
x.clip = x[!is.na(overlay(x, clip.sp)),]
image(x.clip,col="blue",add=T)
the first command creates a SpatialPolygons object from
the coordinates.
