surface_scalar_reflectivityFromGriddedField4

Workspace.surface_scalar_reflectivityFromGriddedField4(self: pyarts.arts._Workspace, surface_scalar_reflectivity: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Vector]] = self.surface_scalar_reflectivity, stokes_dim: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Index]] = self.stokes_dim, f_grid: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Vector]] = self.f_grid, atmosphere_dim: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Index]] = self.atmosphere_dim, lat_grid: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Vector]] = self.lat_grid, lat_true: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Vector]] = self.lat_true, lon_true: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Vector]] = self.lon_true, rtp_pos: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Vector]] = self.rtp_pos, rtp_los: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Vector]] = self.rtp_los, r_field: Union[pyarts.arts.WorkspaceVariable, pyarts.arts.GriddedField4], verbosity: Optional[Union[pyarts.arts.WorkspaceVariable, pyarts.arts.Verbosity]] = self.verbosity) → None

Extracts scalar surface reflectivities from a field of such data.

This method allows to specify a field of surface reflectivity for automatic interpolation to points of interest. The position and direction for which the reflectivity shall be extracted are given by rtp_pos and rtp_los. The reflectivity field is expected to be stored as:

  • GriddedField4:

    • Vector “Frequency” [N_f]

    • Vector “Incidence angle” [N_ia]

    • Vector “Latitude” [N_lat]

    • Vector “Longitude” [N_lon]

    • Tensor4 data[N_f][N_ia][N_lat][N_lon]

Grids for incidence angle, latitude and longitude must have a length of >= 2 (ie. no automatic expansion). If the frequency grid has length 1, this is taken as the reflectivity is constant, following the definition of surface_scalar_reflectivity.

The interpolation is done in steps:

  1. Linear interpolation for lat and lon (std. extrapolation).

  2. Interpolation in incidence angle (std. extrapolation). If the grid has a length of >= 4, cubic interpolation is applied. Otherwise linear interpolation.

  3. Linear interpolation if frequency (if input data have more than one frequency).

Author(s): Patrick Eriksson

Parameters:

  • surface_scalar_reflectivity (Vector, optional) – Surface reflectivity, assuming it can be described as a scalar value. See surface_scalar_reflectivity, defaults to self.surface_scalar_reflectivity [OUT]

  • stokes_dim (Index, optional) – The dimensionality of the Stokes vector (1-4). See stokes_dim, defaults to self.stokes_dim [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]

  • lat_grid (Vector, optional) – The latitude grid. See lat_grid, defaults to self.lat_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]

  • rtp_pos (Vector, optional) – Position of a radiative transfer point. See rtp_pos, defaults to self.rtp_pos [IN]

  • rtp_los (Vector, optional) – Line-of-sight at a radiative transfer point. See rtp_los, defaults to self.rtp_los [IN]

  • r_field (GriddedField4) – A field of scalar surface reflectivities. [IN]

  • verbosity (Verbosity) – ARTS verbosity. See verbosity, defaults to self.verbosity [IN]