foursail: 4SAIL model of canopy reflectance
In ashiklom/rrtm: Implementations of radiative transfer models in R

foursail

R Documentation

4SAIL model of canopy reflectance

Description

4SAIL model of canopy reflectance

Usage

foursail(
  leaf_refl,
  leaf_trans,
  soil_refl,
  LAI,
  hot_spot = 0,
  LIDFa = -0.35,
  LIDFb = -0.15,
  solar_zenith = 0,
  instrument_zenith = 0,
  azimuth = 0
)

Arguments

`leaf_refl`	Leaf reflectance spectrum
`leaf_trans`	Leaf transmittance spectrum
`soil_refl`	Soil reflectance spectrum
`LAI`	Leaf area index
`hot_spot`	Hot spot effect (default = 0)
`LIDFa`	Leaf angle distribution function, parameter 1 (default = -0.35)
`LIDFb`	Leaf angle distribution function, parameter 2 (default = -0.15)
`solar_zenith`	Incident solar zenith angle, in degrees (default = 0)
`instrument_zenith`	Instrument/observer zenith angle, in degrees (default = 0)
`azimuth`	Sun-instrument azimuth angle, in degrees (default = 0)

Value

List containing four reflectance streams: bi-hemispherical (diffuse in, diffuse out; BHR), directional-hemispherical (direct in, diffuse out; DHR), hemispherical-directional (diffuse in, direct out; HDR), and bi-directional (direct in, direct out; BHR).