vSmartMOM Module Methods & Types

Given a path to a YAML parameters file, load all the parameters into a vSmartMOM_Parameters struct

Generate default set of parameters for Radiative Transfer calculations (from ModelParameters/)

Take the parameters specified in the vSmartMOMParameters struct, and calculate derived attributes into a vSmartMOMModel

rt_run(pol_type, obs_geom::ObsGeometry, τ_rayl, τ_aer, quad_points::QuadPoints, max_m, aerosol_optics, greek_rayleigh, τ_abs, brdf, architecture::AbstractArchitecture)

Perform Radiative Transfer calculations using given parameters

rt_run(model::vSmartMOM_Model, i_band::Integer = -1)

Perform Radiative Transfer calculations using parameters passed in through the vSmartMOM_Model struct

struct vSmartMOM_Parameters

A struct which holds all initial model parameters (before any computations)

Fields

• spec_bands

  Spectral bands (nBand)

• brdf

  Surface (Bidirectional Reflectance Distribution Function)

• quadrature_type

  Quadrature type for RT streams (RadauQuad/GaussQuadHemisphere/GaussQuadFullSphere)

• polarization_type

  Type of polarization (I/IQ/IQU/IQUV)

• max_m

  Hard cutoff for maximum number of Fourier moments to loop over

• Δ_angle

  Exclusion angle for forward peak [deg]

• l_trunc

  Truncation length for legendre terms (scalar for now, can do nBand later)

• depol

  Depolarization factor

• float_type

  Float type to use in the RT (Float64/Float32)

• architecture

  Architecture to use for calculations (CPU/GPU)

• sza

  Solar zenith angle [deg]

• vza

  Viewing zenith angles [deg]

• vaz

  Viewing azimuthal angles [deg]

• obs_alt

  Altitude of observer [Pa]

• T

  Temperature Profile [K]

• p

  Pressure Profile [hPa]

• q

  Specific humidity profile

• profile_reduction_n

  Length of profile reduction

• absorption_params

  Optional struct that holds all absorption-related parameters

• scattering_params

  Optional struct that holds all aerosol scattering-related parameters

struct vSmartMOM_Model

A struct which holds all derived model parameters (including any computations)

Fields

• params

  Struct with all individual parameters

• aerosol_optics

  Truncated aerosol optics

• greek_rayleigh

  Greek coefs in Rayleigh calculations

• quad_points

  Quadrature points/weights, etc

• τ_abs

  Array to hold cross-sections over entire atmospheric profile

• τ_rayl

  Rayleigh optical thickness

• τ_aer

  Aerosol optical thickness

• obs_geom

  Observational Geometry (includes sza, vza, vaz)

• profile

  Atmospheric profile to use

Abstract Type for Surface Types

Lambertian Surface (scalar per band)

Defined as Array (has to have the same length as the band!)

Quadrature Types for RT streams

struct RadauQuad

Use Gauss Radau quadrature scheme, which includes the SZA as point (see Sanghavi vSmartMOM)

struct GaussQuadHemisphere

Use Gauss quadrature scheme, define interval [-1,1] within an hemisphere (90⁰), repeat for both

struct GaussQuadFullSphere

Use Gauss quadrature scheme, define interval [-1,1] for full sphere (180⁰), take half of it (less points near horizon compared to GaussQuadHemisphere)

Struct for an atmospheric profile