On May 23, 2011, at 5:55 AM, Pierre Bruyer wrote:
Hello everybody,
I search a function which returns the contour of map with levels
like contourLines, but I would like this function return the border
of the map too, because the function contourLines cannot consider
the corner of the map and it is not adapted to fill polygon after
that.
Frank Harrell has a `perimeter` function in his `rms` package which he
uses to establish (and optionally draw) boundaries around 2D regions
with sufficient data to yield meaningful estimates. The plotting is
handed off to lattice functions. His default plotting function for 2D
plotting is contourplot. It didn't take that long to make the
transition to rms+lattice and I have been very pleased with the
integration of the two.
There is also a chull (convex hull) function although at the moment I
do not remember which package it resides in.
Thanks in advance
Pierre Bruyer
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