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Workspace Method ppath_stepGeometric
Calculates a geometrical propagation path step.
This function determines a propagation path step by pure
geometrical calculations. That is, refraction is neglected. Path
points are always included for crossings with the grids, tangent
points and intersection points with the surface. The WSV ppath_lmax
gives the option to include additional points to ensure that the
distance along the path between the points does not exceed the
selected maximum length. No additional points are included if
ppath_lmax is set to <= 0.
For further information, type see the on-line information for
Authors: Patrick Eriksson