[R-sig-Geo] contourline as border between cells containing numbers and those containing NA of ASCII grid
jansc at gmx.net
Fri Jul 28 01:58:41 CEST 2006
Hi R spatial experts,
From an ASCII grid I have made a couple of filled.contour - plots.
All cells outside the area of interest are set to NA. The cells inside
the area of investigation are numbers(real).
In my plots - both NA's and values smaller than 0.5 are "transparent".
To show the border of the area of investigation I would like to generate
a contourline or something similar in between cells containing numbers and
those containing NA.
Is there any possibile way to do that?
If not: -> How could I overlay a filled.contour-plot with a shape file
(the border of the area)?
Thanks a lot.
More information about the R-sig-Geo