On 06/18/2013 10:42 AM, Jeff Herrin wrote:
I'm trying to get a compass bearing (N,S,NW,etc) using earthdistance.
I can successfully get the distance between 2 points using either the
point or cube method, but I've been struggling with getting the
bearing. Any tips?
PostGIS has some functions that may be of use but might be overkill
depending on your use but I don't see anything in earthdistance.
What are you trying to solve?
It's one thing if you are looking for a one-degree-accurate
magnetic-variation-compensated great-circle heading for a 6,000km flight
using WGS84 projection (initial-heading, of course, as it will vary over
the course of your travel).
If you just want to be accurate to eight compass-points over a few
city-blocks then simple trig is probably more than sufficient.
Cheers,
Steve
