Great to hear a GSOC project will work on this! http://socghop.appspot.com/gsoc/student_proposal/show/google/gsoc2010/rundel/t127052456783
On 05/06/2010 10:27 AM, Ben Madin wrote: > Thanks Roger, > > Congratulations on the GSOC project - I had read about it, but my antipodean > mind-set (Summer is over down here!) meant I thought it might be well > underway or nearly over already! > > cheers > > Ben > > > On 06/05/2010, at 16:08 , Roger Bivand wrote: > >> On Thu, 6 May 2010, Ben Madin wrote: >> >>> G'day all, >>> >>> Please excuse my not finding this, but having just upgraded maptools, there >>> appears to be some issue over gpclib - not looking for trouble, I installed >>> rgeos from r-forge, and it seems to be loadable, but loading maptools I >>> still get the following message. >>> >>>> library(rgeos) >>> Loading required package: sp >>> GEOS runtime version: 3.2.0-CAPI-1.6.0 >>>> library(maptools) >>> Loading required package: foreign >>> Loading required package: lattice >>> >>> Note: polygon geometry computations in maptools >>> depend on the package gpclib, which has a >>> restricted licence. It is disabled by default; >>> to enable gpclib, type gpclibPermit() >>> >>> Checking rgeos availability as gpclib substitute: >>> FALSE >>>> >>> >>> Have I missed something on installation?(I'm using William Kyngesbury's >>> GEOS Frameworks) >> >> No, thanks for taking this up, and for attention to detail. Both maptools >> and spatstat now warn explicitly about the license problems with gpclib. We >> had hoped to have rgeos ready by now, but interfacing GEOS has turned out to >> be harder than anticipated. >> >> The maptools development code had been modified to use rgeos if available - >> by a call to require(), and the inclusion of rgeos in the Suggests: field in >> the package metadata. Before rgeos had been advanced to release status, a >> serious problem was spotted (by Brian Ripley) in the maptools C code for >> reading GSHHS files, triggering a premature release. In this premature >> release, as can be seen in the ChangeLog: >> >> http://cran.r-project.org/web/packages/maptools/ChangeLog >> >> rgeos was hidden, and all links were commented out. Until rgeos is ready for >> returning to Suggests: status, use of the "drop in" rgeos functions has to >> be manual, so instead of say unionSpatialPolygons() in maptools, use >> unionSpatialPolygonsGEOS() in rgeos (and look at the examples on the help >> page, trying them out to see that the rounding problem has now been >> resolved). >> >> R has (once again) had deserved success in the Google Summer of Coding, and >> rgeos is one of the projects that has been adopted. Some of the original >> difficulties have now been resolved, and I hope that the package will be >> greatly improved compared with my "muddling through" first cut at the GEOS >> interface. >> >> Hope this clarifies things a little, >> >> Roger >> >>> >>> cheers >>> >>> Ben >>> >>> >>> >>> sessionInfo() >>> R version 2.10.1 Patched (2010-02-01 r51089) >>> x86_64-apple-darwin9.8.0 >>> >>> locale: >>> [1] en_AU.UTF-8/en_AU.UTF-8/C/C/en_AU.UTF-8/en_AU.UTF-8 >>> >>> attached base packages: >>> [1] stats graphics grDevices utils datasets methods base >>> >>> other attached packages: >>> [1] maptools_0.7-34 lattice_0.18-3 foreign_0.8-40 rgeos_0.0-9 >>> sp_0.9-62 >>> >>> loaded via a namespace (and not attached): >>> [1] grid_2.10.1 tools_2.10.1 >>> >>> _______________________________________________ >>> R-sig-Geo mailing list >>> R-sig-Geo@stat.math.ethz.ch >>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo >>> >> >> -- >> Roger Bivand >> Economic Geography Section, Department of Economics, Norwegian School of >> Economics and Business Administration, Helleveien 30, N-5045 Bergen, >> Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 >> e-mail: roger.biv...@nhh.no >> > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo -- Edzer Pebesma Institute for Geoinformatics (ifgi), University of Münster Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251 8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de http://www.52north.org/geostatistics e.pebe...@wwu.de _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
