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Workspace Method refellipsoidForAzimuth

Description

Conversion of 3D ellipsoid to 1D curvature radius.

Calculates the curvature radius for the given latitude and azimuth
angle, and uses this to set a spherical reference ellipsoid
suitable for 1D calculations. The curvature radius is a better
local approximation than using the local ellipsoid radius.

The used expression assumes a geodetic latitude, but also
latitudes should be OK as using this method anyhow signifies
an approximation.

Authors: Patrick Eriksson

Synopsis

refellipsoidForAzimuth(

refellipsoid, latitude, azimuth )

Variables

OUT+IN	refellipsoid	(Vector)	Reference ellipsoid.
GIN	latitude	(Numeric)	Latitude.
GIN	azimuth	(Numeric)	Azimuth angle.