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polygons_area
2011 Dec 28
3
transparency using plot+points with sp classes
How can I make one point graphics with transparency
These are all sp classes:
plot(polygons_area,axes=TRUE,asp=1.5,main="Title",xlab="Latitude",
ylab="Longitude")
points(observations2000,type = "p",pch=21,col="green")
points(observation1999,type = "p",pch=21,col="blue")
points(reference.points,type =