[R] Delaunay triangles with LONG/LAT + biomass

MacQueen, Don macqueen1 at llnl.gov
Mon Jun 30 21:32:42 CEST 2014

One place to start would be the "Spatial" task view on CRAN.
The other would be to ask on R-sig-geo, where people who specialize in
spatial data "hang out".

Delaunay triangulation is available in several packages. A simple search
for "delaunay" on the CRAN packages page will easily find at least one.
You will also need the sp package for sure.

Assigning a value to each triangle may or may not be easy, it will depend,
probably among other things, on the data structure returned by whatever
function you end up using to create the triangles.

Based on a quick look at your acon web page, you might be happy with
   akima::interp   Gridded Bivariate Interpolation for Irregular Data


Don MacQueen

Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550

On 6/30/14 9:31 AM, "Trevor Davies" <davies.trevor at gmail.com> wrote:

>I was hoping someone could point me in the direction towards a package
>where I can use delaunay triangulation to create a polygon set where the
>inside of the triangles are tagged with an estimate of a mean value of the
>points making up the points of the triangle.  This is fisheries trawl data
>if that helps add context.
>For those familiar with the system, it's to make plots similar to those
>made by the Dept of Fisheries and Oceans Canada in ACON (which has now
>stopped being maintained).  Although freely available, I'm on a mac and it
>would be nice to just get it sorted out in R going forward.
>Ref here:
>Thanks for the help.
>	[[alternative HTML version deleted]]
>R-help at r-project.org mailing list
>PLEASE do read the posting guide
>and provide commented, minimal, self-contained, reproducible code.

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