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...rt 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. Th...