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Workspace Method ppath_stepGeometric

Description

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
ppath_step_agenda.

Authors: Patrick Eriksson

Synopsis

ppath_stepGeometric(

ppath_step, atmosphere_dim, lat_grid, lon_grid, z_field, refellipsoid, z_surface, ppath_lmax )

Variables

OUT+IN	ppath_step	(Ppath)	A propagation path step.
IN	atmosphere_dim	(Index)	The atmospheric dimensionality (1-3).
IN	lat_grid	(Vector)	The latitude grid.
IN	lon_grid	(Vector)	The longitude grid.
IN	z_field	(Tensor3)	The field of geometrical altitudes.
IN	refellipsoid	(Vector)	Reference ellipsoid.
IN	z_surface	(Matrix)	The surface altitude.
IN	ppath_lmax	(Numeric)	Maximum length between points describing propagation paths.