On Mon, 21 Mar 2011 16:51:21 +0100 (CET), Roger Bivand <Roger.Bivand at nhh.no>
wrote:
On Mon, 21 Mar 2011, Roger Bivand wrote:
With some trepidation, rgeos - an interface to Geometry Engine - Open
Source (GEOS) for topology operations on sp geometries - is now released
on CRAN as a source package. A Windows binary package should follow within
a couple of days. If an OSX binary package is offered on CRAN extras,
information will be given, otherwise use the Kyngchaos framework and
install from source. Contributions of bug reports, code patches, and
extensions are welcome, especially via R-Forge. Congratulations to Colin
Rundel for a very thorough implementation during GSoC 2010!
The fresh maptools 0.8-* release now on CRAN suggests rgeos. It can
use rgeos in checkPolygonHoles(), unionSpatialPolygons() and
elsewhere, but can still use gpclib if the user prefers. The rgeos
version of checkPolygonHoles() adds a comment to each Polygons object,
showing whether the member Polygon objects are exterior rings in the
OGC "Simple Features" sense, and if they are interior rings, which
exterior ring contains them. This maptools release addresses many of
the issues raised over recent weeks, but which have been waiting for
rgeos to be released.
Roger
1. It looks like it's propagating slowly to US mirrors -
http://cran.cnr.berkeley.edu seems to have it, though.
2. The last time I installed the Spatial task view from source, quite a few
routines seemed to have the option of using rgeos but I was never able to get
that to work. Is there anything I need to do to make that "automatic", or
does just installing rgeos from CRAN now make it happen?