Message-ID: <CAErHZW07B0tjR_GjAxsAKkFq1hvp=dWwB19A6ZcysF6wo-_AMQ@mail.gmail.com>
Date: 2011-12-28T12:13:14Z
From: Ana
Subject: 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 = "p",pch=21,col="red")
how can I add transparency to one of the point graphics, for example
points(observation1999,type = "p",pch=21,col="blue") ?