In un messaggio del Tuesday 15 September 2009, andrea santangeli ha scritto: > Hi all, > > my name is Andrea Santangeli and I´m doing a PhD in Finland on the > Tengmalm´s owl. Hi have a lot of radiotracking data to deal with and am > asking for some practical advice: 1) extract the real position > (coordinates) of the owl from one observer position (in geogr. coord of the > type: lat: 62.98851 and long: 23.06411), distance and bearing (degrees > from 0 to 360), either with a fomula to apply in excel or with another > program; 2) extract the real position (coordinates) of the owl from two > observer positions (in geogr. coord of the type: lat: 62.98851 and long: > 23.06411), and bearing (degrees from 0 to 360), basically a triangulation > issue here.
Hi Andrea first, perhaps diong something to your point locations - such as projecting them into a cartesian coordinate space - should be a first pass. To accomplish that, any GIS software will do, ranging from Quantum GIS to R geographical information system functions. Once you have your location + bearing + distance or pair of location + bearings, then is simple trigonometry. The second case is covered by the code in the triang.R script (still in development, look for the publicly available repository at svn://home.prea.net/svn), the first is a trivial conversion from polar to cartesian systems, again, you can find something in triang.R sourcecode. By the way, choose your number crunching tool (i.e. a true GIS or a GIS- capable data analysis environment) depending on what you have to do _next_, i.e. once your location + bearing + distance or triangulation have been transformed into owls positions... what happens? Home range calculations? (=> R) Buffering and land use clip? ( => QGis with R in the backoffice). Hope this help! -- You plan things that you do not even attempt because of your extreme caution. ----------------------------------------------------------- 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 ----------------------------------------------------------- Please consider the environment before printing this email Please do not send attachments in proprietary formats http://www.gnu.org/philosophy/no-word-attachments.html Use the UNI CEI Standard ISO/IEC 26300:2006 ----------------------------------------------------------- O< stop html mail - http://www.asciiribbon.org
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