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Workspace Method ppath_fieldFromDownUpLimbGeoms


Computes ppath_field from "standalone" sensors looking upwards from
0 m altitude with zenith angles range [0, 90], downwards from the top
of the atmosphere covering the zenith angle range from 180 degrees to
the surface tangent minus 1e-4 degrees, and through the limb covering
at the same position as the downwards looking sensor covering the zenith
angle range from the surface tangent plus 1e-4 degrees to 90 degrees minus
1e-4 degrees.

The top of the atmosphere is from z_field (-1, 0, 0) [python range notation].

The field will consist of 3 * nz arrays structured as [up, limb, down]

The intent of this function is to generate a field so that calculations
of ppvar_iy of all the fields will cover the zenith angle space
of all positions in z_field.

Only works for atmosphere_dim 1, spherical planets, and ppath_lmax < 0

Authors: Richard Larsson


ppath_fieldFromDownUpLimbGeoms( ppath_field, ppath_agenda, ppath_lmax, ppath_lraytrace, atmgeom_checked, z_field, f_grid, cloudbox_on, cloudbox_checked, ppath_inside_cloudbox_do, rte_pos, rte_los, rte_pos2, refellipsoid, atmosphere_dim, nz )


OUTppath_field(ArrayOfPpath)An array meant to build up the necessary geometries for radiative field calculations.
INppath_agenda(Agenda)Calculation of complete propagation paths.
INppath_lmax(Numeric)Maximum length between points describing propagation paths.
INppath_lraytrace(Numeric)Maximum length of ray tracing steps when determining propagation paths.
INatmgeom_checked(Index)OK-flag for the geometry of the model atmosphere.
INz_field(Tensor3)The field of geometrical altitudes.
INf_grid(Vector)The frequency grid for monochromatic pencil beam calculations.
INcloudbox_on(Index)Flag to activate the cloud box.
INcloudbox_checked(Index)OK-flag for variables associated with the cloudbox.
INppath_inside_cloudbox_do(Index)Flag to perform ray tracing inside the cloudbox.
INrte_pos(Vector)A geographical position for starting radiative transfer calculations.
INrte_los(Vector)A line-of-sight for (complete) radiative transfer calculations.
INrte_pos2(Vector)A second geographical position to define the geometry for radiative transfer calculations.
INrefellipsoid(Vector)Reference ellipsoid.
INatmosphere_dim(Index)The atmospheric dimensionality (1-3).
GINnz(Index, Default: 3)Number of zenith angles per position