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 <[email protected]> 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 > [email protected] > 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: [email protected] PGP Key available Tel. + 351 96 7058216 -- _______________________________________________ AniMov mailing list [email protected] http://lists.faunalia.it/cgi-bin/mailman/listinfo/animov
