[AniMov] position estimation from azimuths

Damiano G. Preatoni prea at uninsubria.it
Fri Oct 10 13:42:49 CEST 2008


In un messaggio del Sunday 22 June 2008, Lichti, Nathanael I ha scritto:
> Thanks, Mike.  These look like useful packages - especially the trip
> estimation package - I'm looking forward to trying it out on some of my
> tracking data!  However, I am fairly certain that deldir and ellipse will
> not work for this particular problem.  deldir performs Delauny
> triangulations, whereas we want to triangulate the position of an animal
> from azimuths taken at various observation points.  Fortunately, this is
> pretty straight forward trigonometry, so that's not a big deal.
>
> I'm less certain about ellipse without playing with it, but nothing in my
> initial reading of the documentation leads me to think that it calculates
> confidence ellipses based on the Andrews, Huber, or ML estimators from
> Lenth's 1981 paper. Do you know if there is a way to get it to do this?
>
> Just FYI, I wrote to Gary White and got permission to try porting TRIANG to
> R.  I'll do this over the next month and let you all know how it goes.
>


Any news about TRIANG code?

Here we're about to start a thesis project aimed to create from scratch code 
(either in R or in QGis + Python, we've still to define that), just starting 
from White & Garrot book...

Any suggestion is welcome, of course!


-- 
Barometro, s.m.:
	Un ingegnoso strumento che indica che tipo di tempo stiamo avendo.
		-- Ambrose Bierce, "The Devil's Dictionary"
-----------------------------------------------------------
Damiano G. Preatoni, PhD

Unità di Analisi e Gestione delle Risorse Ambientali
Dipartimento Ambiente-Salute-Sicurezza
Università degli Studi dell'Insubria
Via J.H. Dunant, 3 - 21100 Varese (ITALY)

tel +39 0332421538 fax +39 0332421446
http://biocenosi.dipbsf.uninsubria.it/
ICQ: 78690321 jabber: prea at jabber.org skype: prea.net
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