Also be aware that if using this to map things, the projection of the map plays a very important role. Not all projections preserve angle or distance as you'd expect.
On 25/05/2009, Bill Ricker <[email protected]> wrote: >> > Given this information, can I tell the positions of A, B, and C? > >> Yes: > > correct. each of your three measured angles determines a circle > through the two known points. Where the three circles intersect, is > where you are. > > Typically the three arcs don't quite intersect in an exact point, so > the triangle formed by the three intersections is the probable region. > The slightest error in angular measure shifts both the center and > radius of the circle produced, so this requires high precision for > precise results. > > This probable triangle is a more obvious uncertainty than taking > bearings TO X from A and B, whence the region of uncertainty resulting > from the error of measurements is non-obvious, and balloons in range > behind the most likely point as baseline shrinks in comparison to > range. > > > -- > Bill > [email protected] [email protected] > > _______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies > -- Regards, Thomas Wood (Edgemaster) _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
