azimuthgeocode(geocode1, geocode2 [, method])
azimuthgeocode function calculates the directional heading
going from one geocode to another. It returns a number between 0-360
where 0 is north, 90 east, etc., up to 360 being north again.
The third, optional
method parameter can be used to specify
which mathematical method is used to calculate the direction. There
are two possible values:
greatcircle (default) - The "Great Circle" method
is a highly accurate tool for calculating distances and directions on
a sphere. It is used by default.
pythagorean - Calculations based on the pythagorean
method can also be used. They're faster, but less accurate as the
core formulas don't take the curvature of the earth into
consideration. Some internal adjustments are made, but the values are
less accurate than the
greatcircle method, especially over long
distances and with paths that approach the poles.
For examples of using
azimuthgeocode, see the
script in the