Hi all,
2011/4/4 Felipe Carrillo <mazatlanmex...@yahoo.com>:
> Manuel:
> As far as I know one needs gpclibPermit() in order to fortify
> see this:
> 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()
> I am going to guess that ahmadou dicko doesn't show gpclibPermit() on his
> code
> because he loaded it with Rprofile or some other way. I tried to run his
> code without
> gpclibPermit() and it wouldn't let me fortify, so not sure how he did it.
On that specific point, Colin Arundel and Roger Bivant released the
rgeos package on CRAN a few days [1]. This is a great achievement as
it brings bindings to the GEOS C++ lib [2] - long story short, it
makes the job the non-free [3] gpclib used to do.
In its later release, maptools has an option to check if rgeos if
present - if it is the case it is used instead of gpclib:
> library(maptools)
Loading required package: foreign
Loading required package: sp
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:
TRUE
> ?gpclibPermit
Pierre
[1] http://cran.r-project.org/web/packages/rgeos/
[2] http://trac.osgeo.org/geos/
[3] https://stat.ethz.ch/pipermail/r-sig-geo/2010-January/007400.html
--
Scientist
Landcare Research, New Zealand
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