Il giorno mer, 09/09/2009 alle 20.07 +0200, Breitbach, Nils ha scritto: > Hi Community, > > I am new to this forum and I am starting to analyse my telemetry data trying > to be independent from commercial software. So far all I wanted to do was > possible with R. Now I am looking for a function that is able to do > triangulation. The structure of my data is as follows: > > - two consecutive rows with coordinates (lat and long in separate columns; at > the moment in WGS1984 and decimal degrees) and in a further column a > corresponding direction in degrees from 0 to 359 > - each of the two consecutive rows has an identifier (T1 and T2) > > I now want to calculate the intersection point of these two consecutive rows > (T1 and T2) getting one coordinate in long and lat of the intersection point > in WGS1984 and decimal degrees. > > Do you know of any function/package that is able to perform such a > triangulation or at least one that does a similar operation?
Hello Nils, a triangulation function has been recently ported to R and is available on SVN: svn co svn://home.prea.net/svn/triang/trunk triang.R is the script containing the algorithm, do.triang.R is a test based on data in fix.dbf. The code is in a very alpha state, further testing and hopefully development is welcome :) For animal movement software in general, keep an eye also on Animove list (in copy). Hope this helps, Anne Ghisla > Thank you! > > Nils > _______________________________________________ > R-sig-Geo mailing list > [email protected] > https://stat.ethz.ch/mailman/listinfo/r-sig-geo
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