Plotting - holes from shapefile
Hi, Guess this is quite easy when one just knows how, but I have noe been able to dig out how... I have a shape file with water areas with some islands. I want to plot this without the islands. In the shape file, the islands are flagged with a certain value, so I can remove them, but it doesn't seem to work. What I am doing is: reading in the shape file:
norvann=readOGR(mapdir,'fylk-vaf')
then I've tried to flag the holes:
norvann$hole=norvann$FTEMA==0
or I've removed the islands
norvann=norvann[norvann$FTEMA>0,]
Note, Ive done one of these on a new data set I've read from the file. Then I've plotted it:
plot(nordvann, col='blue')
In both cases both water and islands comes out colored blue... guess I've overlooked something... but what? Morten Sickel -- Morten Sickel Norwegian Radiation Protection Authority tel (+47) 6716 2551