RT Parameters Guide
radiative_transfer group
spec_bands: List of spectral bands to be included in the computation, written in the form, ν_start:ν_step:ν_end
. Units in cm⁻¹.
surface: Type of reflectance surface to model at bottom of atmosphere. Currently only supporting Lambertian surface types. Should be written in the form, LambertianSurfaceScalar(albedo)
.
quadrature_type: Quadrature type for RT streams. Should be one among [RadauQuad
, GaussQuadHemisphere
, GaussQuadFullSphere
].
polarization_type: Level of polarization to simulate. Should be one among [I
, IQ
, IQU
, IQUV
].
max_m: Hard cutoff for maximum number of Fourier moments to loop over. Should be a positive integer.
Δ_angle: Exclusion angle for forward peak in phase truncation. Units in degrees
.
l_trunc: Truncation length for legendre terms. Should be a positive integer.
depol: Depolarization factor to use in Rayleigh calculations (unitless).
float_type: Float type to use in the RT simulations. Should be one of [Float64
, Float32
].
architecture: Hardware architecture to use for calculations. Should be one among [CPU
, GPU
].
geometry group
sza: Solar zenith angle, units in degrees
.
vza: List of viewing zenith angles, units in degrees
.
vaz: List of viewing azimuthal angles, units in degrees
. Should be same length as vza.
obs_alt: Altitude of observer, in Pascal
.
atmospheric_profile group
T: Temperature at each layer midpoint, as list from TOA to BOA, in Kelvin
.
p: Pressure at each layer boundary, as list from TOA to BOA, in hPa
. Should be one element greater in length than T.
q (optional): Specific humidity at each layer midpoint. Units in g/Kg
.
profile_reduction: Length of profile reduction to be performed internally. Must be positive integer less than length of T, or -1 for no reduction.
absorption group (optional)
molecules: Which molecules should be used for absorption calculations in each band. Should be a list of lists of molecule names (outer list over number of bands, inner list to hold molecules). Use vSmartMOM.Absorption.show_molecules()
to see a list of valid molecules.
vmr: A dictionary of volume-mixing ratios that match every individual molecule listed in molecules to a vmr. A vmr can be either a single number, or an array to interpolate from TOA to BOA, according to the number of layers specified by the p/T grids.
broadening_function: Type of broadening function to use in absorption calculations. Should be one of [Voigt()
, Lorentz()
, Doppler()
]. Please note the parentheses.
CEF: Complex error function for Voigt calculations. Default should generally be used, HumlicekWeidemann32SDErrorFunction()
. Please see Absorption/complexerrorfunctions.jl for details.
wing_cutoff: Wing cutoff to use in the line-by-line absorption calculations. Should be a positive number in units, cm⁻¹
.
scattering group (optional)
aerosols: A list of scattering aerosols and their properties. Each aerosol should be a dictionary of key-value pairs for the following keys:
- τ_ref: Reference τ, in
µm
- μ: Log mean radius, in
µm
- σ: Log stddev of radius, in
µm
- nᵣ: Real part of refractive index (unitless)
- nᵢ: Imaginary part of refractive index (unitless)
- p₀: Pressure peak, in
Pa
- σp: Pressure peak width, in
Pa
r_max: Maximum aerosol particle radius for quadrature points/weights. Units in µm
.
nquad_radius: Number of quadrature points for aerosol radius. Should be a positive integer.
λ_ref: Reference wavelength. Units in µm
.
decomp_type: Fourier decomposition method to use. Should be one of [NAI2()
, PCW()
]. NAI2 should be used for most cases. Please note the parentheses.