iyIndependentBeamApproximation

Samples atmosphere along ppath and make 1D-type RT calculation.

The main application of this method should be to apply 1D scattering solvers on 2D or 3D atmospheres. The 1D calculation is set up inside iy_independent_beam_approx_agenda.

The method calculates the ppath until reaching the surface or the top-of-the atmosphere. If the sensor is inside the atmosphere the ppath is extended from the sensor vertically to cover the remaining part of the atmosphere. All atmospheric fields are interpolated to the obtain ppath, to form a 1D view of the atmosphere. This 1D atmosphere forms the input to iy_independent_beam_approx_agenda

lat_true and lon_true for the 1D view is set to the intersection with the surface of the ppath described above.

The function accepts that the input atmosphere is 1D, as well as that there is no active cloudbox.

The constructed 1D atmosphere is exported if the GIN return_atm1d is set to 1. The default then is to include all atmospheric fields, but vmr_field and pnd_field can be deselected by two of the GIN-s. The order of the fields is specified by the first grid in the structure member grids. If atm_fields_compact is denoted as A, then A.grids{0}{i} gives the name of field with index i. Each book in vmr_field and pnd_field is stored separately. For example, the first book in pnd_field is stored with the name “Scattering element 0”.

Author(s): Patrick Eriksson

Parameters:

iy (Matrix, optional) – Monochromatic pencil beam radiance spectrum. See iy, defaults to self.iy [OUT]
iy_aux (ArrayOfMatrix, optional) – Data auxiliary to iy. See iy_aux, defaults to self.iy_aux [OUT]
ppath (Ppath, optional) – The propagation path for one line-of-sight. See ppath, defaults to self.ppath [OUT]
diy_dx (ArrayOfTensor3, optional) – Derivative of iy with respect to retrieval quantities. See diy_dx, defaults to self.diy_dx [INOUT]
atm_fields_compact (GriddedField4, optional) – A compact set of atmospheric fields on a common set of grids. See atm_fields_compact, defaults to self.atm_fields_compact [OUT]
iy_id (Index, optional) – Identification number of iy. See iy_id, defaults to self.iy_id [IN]
f_grid (Vector, optional) – The frequency grid for monochromatic pencil beam calculations. See f_grid, defaults to self.f_grid [IN]
atmosphere_dim (Index, optional) – The atmospheric dimensionality (1-3). See atmosphere_dim, defaults to self.atmosphere_dim [IN]
p_grid (Vector, optional) – The pressure grid. See p_grid, defaults to self.p_grid [IN]
lat_grid (Vector, optional) – The latitude grid. See lat_grid, defaults to self.lat_grid [IN]
lon_grid (Vector, optional) – The longitude grid. See lon_grid, defaults to self.lon_grid [IN]
lat_true (Vector, optional) – Latitudinal geolocation for 1D and 2D data. See lat_true, defaults to self.lat_true [IN]
lon_true (Vector, optional) – Longitudinal geolocation for 1D and 2D data. See lon_true, defaults to self.lon_true [IN]
t_field (Tensor3, optional) – The field of atmospheric temperatures. See t_field, defaults to self.t_field [IN]
z_field (Tensor3, optional) – The field of geometrical altitudes. See z_field, defaults to self.z_field [IN]
vmr_field (Tensor4, optional) – VMR field. See vmr_field, defaults to self.vmr_field [IN]
nlte_field (EnergyLevelMap, optional) – The field of NLTE temperatures and/or ratios. See nlte_field, defaults to self.nlte_field [IN]
wind_u_field (Tensor3, optional) – Zonal component of the wind field. See wind_u_field, defaults to self.wind_u_field [IN]
wind_v_field (Tensor3, optional) – Meridional component of the magnetic field. See wind_v_field, defaults to self.wind_v_field [IN]
wind_w_field (Tensor3, optional) – Vertical wind component field. See wind_w_field, defaults to self.wind_w_field [IN]
mag_u_field (Tensor3, optional) – Zonal component of the magnetic field. See mag_u_field, defaults to self.mag_u_field [IN]
mag_v_field (Tensor3, optional) – Meridional component of the magnetic field. See mag_v_field, defaults to self.mag_v_field [IN]
mag_w_field (Tensor3, optional) – Vertical component of the magnetic field. See mag_w_field, defaults to self.mag_w_field [IN]
cloudbox_on (Index, optional) – Flag to activate the cloud box. See cloudbox_on, defaults to self.cloudbox_on [IN]
cloudbox_limits (ArrayOfIndex, optional) – The limits of the cloud box. See cloudbox_limits, defaults to self.cloudbox_limits [IN]
pnd_field (Tensor4, optional) – Particle number density field. See pnd_field, defaults to self.pnd_field [IN]
particle_masses (Matrix, optional) – The mass of individual particles (or bulks). See particle_masses, defaults to self.particle_masses [IN]
ppath_agenda (Agenda, optional) – Calculation of complete propagation paths. See ppath_agenda, defaults to self.ppath_agenda [IN]
ppath_lmax (Numeric, optional) – Maximum length between points describing propagation paths. See ppath_lmax, defaults to self.ppath_lmax [IN]
ppath_lraytrace (Numeric, optional) – Maximum length of ray tracing steps when determining propagation. See ppath_lraytrace, defaults to self.ppath_lraytrace [IN]
iy_agenda_call1 (Index, optional) – Flag to handle recursive calls of iy_main_agenda. See iy_agenda_call1, defaults to self.iy_agenda_call1 [IN]
iy_unit (String, optional) – Selection of output unit for radiative transfer methods. See iy_unit, defaults to self.iy_unit [IN]
iy_transmittance (Tensor3, optional) – Transmittance to be included in iy. See iy_transmittance, defaults to self.iy_transmittance [IN]
rte_pos (Vector, optional) – A geographical position for starting radiative transfer calculations. See rte_pos, defaults to self.rte_pos [IN]
rte_los (Vector, optional) – A line-of-sight for (complete) radiative transfer calculations. See rte_los, defaults to self.rte_los [IN]
rte_pos2 (Vector, optional) – A second geographical position to define the geometry for. See rte_pos2, defaults to self.rte_pos2 [IN]
jacobian_do (Index, optional) – Flag to activate (clear-sky) Jacobian calculations. See jacobian_do, defaults to self.jacobian_do [IN]
iy_aux_vars (ArrayOfString, optional) – Selection of quantities for iy_aux and when applicable also y_aux. See iy_aux_vars, defaults to self.iy_aux_vars [IN]
iy_independent_beam_approx_agenda (Agenda, optional) – Agenda dedicated to iyIndependentBeamApproximation(). See iy_independent_beam_approx_agenda, defaults to self.iy_independent_beam_approx_agenda [IN]
return_atm1d (Index, optional) – Flag to trigger that atm_fields_compact is filled. . Defaults to 0 [IN]
skip_vmr (Index, optional) – Flag to not include vmr data in atm_fields_compact. Defaults to 0 [IN]
skip_pnd (Index, optional) – Flag to not include pnd data in atm_fields_compact. Defaults to 0 [IN]
return_masses (Index, optional) – Flag to include particle category masses in atm_fields_compact.Conversion is done by particle_masses. Defaults to 0 [IN]
verbosity (Verbosity) – ARTS verbosity. See verbosity, defaults to self.verbosity [IN]