vSmartMOM Module Methods & Types

Load parameters from a file path using the formats registry

Load parameters from an IOSource using the formats registry

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

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

rt_run(model::vSmartMOM_Model; i_band::Integer = 1)

Perform Radiative Transfer calculations using given parameters if no Raman is used

rt_run(S_type::AbstractRamanType,model::vSmartMOM_Model; i_band::Integer = 1)

Perform Radiative Transfer calculations using given parameters and AbstractRaman type

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