Hi Bruce and Giovanni, we used the same method for radio tracking of tarsiers. While "triangulation" plugin is good for mass processing of the data, it was not usable for our project - due to very difficult terrain and other constraints we obtained a limited number of measurements, some of them apparently wrong (e.g. reflection of the radio signal, weak singal, etc.).
To process such data I developed a plugin which let you plot the bearings (lines) one by one and place the estimated location of the animal manually. It is not actively maintained at the moment and not yet ported to qgis 2.0 but I plan to do it in the comming months. If you find such plugin useful, see http://www.tarsiusproject.org/download/ Vaclav 2013/10/30 Giovanni Manghi <giovanni.man...@faunalia.pt> > Hi Bruce, > > a while ago we made a plugin for QGIS that does exactly what you need, > is called "triangulation". I thas not been ported (yet) to qgis 2.0, > but will work on qgis 1.8. > > It does not require R > . > > Cheers > > -- Giovanni -- > > On Wed, Oct 30, 2013 at 9:10 PM, Bruce Miller <batsnc...@gmail.com> wrote: > > Hi all, > > > > I need to derive new points or a line from a given angle. > > > > My data points will be from radio tracking bats at night. > > The 3 ground crews (also an additional one in the sky on a plane) > recording > > radio tag values and signal strengths.. > > What I need to do is use a GPS point (location of the survey crew radio > > receiver that is tracking) when they detect a transmitter on a bat and > add > > the direction of that signal. > > > > So if Team 1 is a point X-Y and has a location of the transmitter > recorded > > at ± 211° I need to be able to draw a line from the base point where they > > were X-Y (via GPS) and set a new point out some 10-20 km at that > 211°angle. > > > > As I will have the tracks from all survey crews these lines from each > base > > location when signals are detected with the direction angle determined > > I can "triangulate" where the three lines intersect to estimate the > location > > of the bat (transmitter). > > Apparently Near will work but only with an ArcInfo license and I do not > have > > that license only Arc Editor. > > Is there a way to do this using R. I assume so but do not know where to > > fdind it. > > > > Bruce > > _______________________________________________ > > AniMov mailing list > > AniMov@faunalia.it > > http://lists.faunalia.it/cgi-bin/mailman/listinfo/animov > > > > -- > Giovanni Manghi > Faunalia.pt > Sistemas de Informação Geográfica Open Source > Portugal > > Web: http://www.faunalia.pt > Email & Jabber: giovanni.man...@faunalia.pt > PGP Key available > Tel. + 351 96 7058216 > -- > _______________________________________________ > AniMov mailing list > AniMov@faunalia.it > http://lists.faunalia.it/cgi-bin/mailman/listinfo/animov >
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