contour labelling [was "Re: [R] image ()"]

[Thomas Lumley]

On Thu, 3 Dec 1998, Bill Simpson wrote:

> > include upgrading contour, image, persp etc.  In addition I hope that
> > he will also add some mapping facilities along the lines of GMT (using
> > their shoreline database).
> > 
> > Now would be a good time to make suggestions about desirable features.
> 
> OK this may be a long shot.
> I often have to make a plot of like this: the heights (z) of trees in a
> forest (whose locations are unif rand x,y) are recorded. Now we make a 3D
> shaded surface plot of the (x,y,z) data. A triangular mesh is made by
> finding the Delaunay triangulation (nearest neighbours are connected).
> 
> I am not talking about doing some form of interpolation (hence forcing the
> data onto a regular grid).

There is GPLed Delaunay triangulation code in Java (including a fast
approximate algorithm) as part of Visad
(http://www.ssec.wisc.edu/~billh/visad.html). There is an old C
implementation which may well have the same algorithms.

	-thomas

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