azimuthlatlon(lat1, lon1, lat2, lon2, [, method])

The azimuthlatlon function calculates the directional heading going from one latitude-longitude point to another. It operates identically to azimuthgeocode, except azimuthlatlon takes its parameters in a pair of latitude-longitude points instead of geocode values.

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.

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