On Mon, 30 Apr 2007, Pedro Mardones wrote:
Dear R users;
Is there any way to intersect a filled contour image and a polygon? My
problem is that I want to create a kriging map and the boundaries of
my map are given by the coordinates of the polygon.
So far I can superompose the polygon in the filled.contour image but I
don't know how to get rid of the contour image outside of the polygon
boundaries.
Two possibilities seem to be present: define your polygon as a hole inside
the bounding box of the image, with a link between the polygon and the
bounding box, and fill it; or, perhaps better, only make kriging
predictions for the polygon. Since you haven't given a code example, it
isn't obvious how you are making the kriging predictions, but the choice
of the newdata locations ought to decide - and they do not need to be a
full grid, or even a regular grid at all.
If you need to follow this up, please consider using the R-sig-geo list.
Any hint will be appreciated
PM
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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [EMAIL PROTECTED]
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