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black and white textures for reclassed map in R

On Mon, 31 Aug 2015, Seyed Jalil Alavi via R-sig-Geo wrote:

            
Base graphics use hashing as described in ?polygon; so the plot() method 
for SpatialPolygon objects uses them too, see: ?"Spatial-class". See also:

http://rspatial.r-forge.r-project.org/gallery/#fig15.R

for an example with code.

Roger