[R] any good way to convert sp class objects to splancs object
Dylan Beaudette
dylan.beaudette at gmail.com
Wed Oct 25 23:12:00 CEST 2006
On Wednesday 25 October 2006 12:02, Roger Bivand wrote:
> On Wed, 25 Oct 2006, Dylan Beaudette wrote:
> > Greetings:
> >
> > are there any simple ways to convert an sp class object to a splancs ppp
> > class object, outside of reading the coordinates and computing a
> > bounding box?
>
> Aren't ppp class objects from the spatstat package? Have you tried the
> spspatstat wrapper package on the R-spatial sourceforge repository? The
> as() coerce method should get you there.
>
> If you really mean splancs, there are not wrappers yet, but are on their
> way.
>
> (Consider posting on R-sig-geo for specific questions like this).
>
> Roger
>
> > cheers,
Thanks for the reply Roger.
I made a slight mistake. I meant to say:
convert sp class object (point / polygon) to a *spatstat* ppp class object.
in the mean time i had come up with the following hack:
# extract data from sp coords slot
# extract data from sp bbox slot
#manually build ppp class object with the ppp() function.
#note that in spatstat the ordering of vertices in a polygon must be in
counter-clockwise direction, so i had to reverse my vertex vectors.
i will post the worked up examples with data in a bit.
thanks!
--
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341
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