In un messaggio del Friday 03 September 2010, Giovanni Manghi ha scritto: > Hi, > > > I'm forwarding our correspondence with Vaclav, maybe someone could have > > any thoughts. In the situation presented on the screenshots, there was > > three bearings building a triang. Then adding the fourth bearing (the > > point on the nord) doesn't change the polygon geometry, but moves the > > location as it's computed as a center of gravity. For me it's the best > > solution, but maybe anyone have better ideas? > > the math (for three or more bearings) can be pretty complicated, see for > example the paragraph "3 or more receiving stations" in White and Garrot > "Analysis of Wildlife Radio-Tracking Data". So I guess that in this > early stage of development of the plugin the centre of gravity is > acceptable.
_that_ math has been already been implemented in an R script to be added i) in
AniMove wiki, ii) perhaps in QGis plugin...
If anyone wants to reinvent it, I can supply my draft wheel ;)
I also did (for a master thesis here) a partial porting of Gary White's
TRIANG.
I vaguely remember that a year ago or more this subject was discussed with
Clément (adehabitat)...
IMHO the problem is: write code for QGis only, or stick with an architecture
based on R for the calculation engine and QGis for a GUI?
This is because HR calculations either are "single shot" (i.e., few animals,
experimenting with methods, etc, and is better to habdle them from inside
QGis) or "batch" (i.e. thousand of fixes and hundreds of animals handled
automatically inside R).
Any ideas (say, Paolo, Anne, Cleḿent, Boris?)
--
Diplomacy is about surviving until the next century. Politics is about
surviving until Friday afternoon.
-- Sir Humphrey Appleby
-----------------------------------------------------------
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: [email protected] skype: prea.net
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