Thanks, i might try looking at the R packages and if I get frustrated I'll check out the book.
2012/7/18 Robert J. Hijmans <[email protected]> > > There is a triangulation example in the geosphere vignette: > http://cran.r-project.org/web/packages/geosphere/vignettes/geosphere.pdf > This is for spherical (longitude/latitude) coordinates, but perhaps it is > useful to look at when developing something similar for xy coordinates. > > Robert > > On Wed, Jul 18, 2012 at 2:09 PM, Barry Rowlingson < > [email protected]> wrote: > >> On Wed, Jul 18, 2012 at 7:24 PM, Robby Marrotte <[email protected]> >> wrote: >> > Hello everyone, >> > >> > I have data where for every tracked individual we have 3 >> radio-telemetry xy >> > locations with an orientation (0-360 deg). What I want to do is create >> > triangles which represent the possible locations of each individual. It >> > seems quite simple, but I haven`t found a script which does this yet. I >> > tried Hawth`s tools but it doesn't have anything like this. >> >> Hawth? Who that? >> >> I'm no expert in this, but I've had a good search for anything that >> might do this in R, but can't find anything either. Found some >> literature (Russell V. Lenth appears to be quite the man for this) and >> some of the techniques in "On Finding The Source Of A Signal" in >> Technometrics 1981 by him should be easy to implement in R if anyone >> has a spare day... >> >> The naive method of intersecting the lines should be doable with >> high-school geometry, but Lenth warns: >> >> """ >> A simple method for estimating (x, y) would be to use the >> componentwise average of the n(n - 1)/2 bearing intersections >> (assuming the observation points are distinct and that each bearing >> intersects all other bearings). However, these points of intersection >> are not stochastically independent. Moreover, their error structures >> depend on the distances from the corresponding observation points as >> well as the angle of intersection. Thus it would be difficult to >> determine the statistical properties of such an estimator.""" >> >> Barry >> >> _______________________________________________ >> R-sig-Geo mailing list >> [email protected] >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo >> > > [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo
