> > 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
