Now available on CRAN is a revised version of the shapefiles package for
reading and writing shapefiles in R.  New additions, courtesy of others,
include the ability to convert a simple R data frame of points,
polylines or polygons to a shp format list, which can then be written
out to a shapefile with write.shp.  There is also a function to convert
the read.shp shp format list to a simple data frame as well.  In
addition, there is a basic implementation of the Douglas-Peucker
polyline (and polygon) simplification routine.  Also, through the help
of others, there is now the ability to read and write polyline Z and
polygon Z format shapefiles.  The read.dbf and write.dbf functions in
the foreign library are now used for dbf I/O, which significantly
improves the speed.  There are probably a few bugs in there that I did
not catch, so please email me if you find them.  Thanks.

Ben Stabler
Project Manager
PTV America, Inc.
1128 NE 2nd St, Suite 204
Corvallis, OR 97330
541-754-6836 x205
541-754-6837 fax
 <http://www.ptvamerica.com/> www.ptvamerica.com

 

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