On Wed, 18 Nov 2009, Michael Friendly wrote:
The Guerry package contains two maps of france (gfrance, gfrance85) which are
quite detailed and large in size (~900K).
In writing a vignette for the package, there are quite a few figures that use
the map multiple times in a layout, and
consequently result in huge file sizes for the .PDF files created. For these
purposes, the map need not be nearly
so detailed.
I'm wondering if there is a facility to "thin" the map by drawing it at a
lower density of lines in the polygon regions.
When I was working with SAS, there was a GREDUCE procedure that did this
nicely.
Not yet - the interface to JTS in the cshapes package only uses line
generalisation on the built-in data set. I'm looking at ways of
interfacing GEOS, which does offer this, but it will take a little time to
complete. For a quicker solution, there are facilities in GRASS in
v.generalize.
Roger
thanks,
-Michael
--
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
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