Modis

This is the BRDF model used by MODIS for their BRDF/albedo product. It consists of a linear combination of an isotropic (lambertian) term, a volume scattering term (Ross-thick), and a geometric scattering term (Li-Sparse-Reciprocal).

Example

import sasktranif.sasktranif as skif
import math

brdf = skif.ISKBrdf('MODIS')
mjd            = 52393.3792987115;
location       = [0.0, 0.0, 25000.0, mjd];
[ok,brdfvalue] = brdf.BRDF( 600.0, location, 0.6, 0.7, -0.8)

Properties

BRDFParameters

BRDF_MODIS.BRDFParameters(array param)

A 3 element array containing the 3 parameters of the MODIS distribution.

n	Setting
parameters[0]	isotropic (lambertian) component
parameters[1]	linear weight of volume scattering kernel (Ross-Thick)
parameters[2]	linear weight of geometric scattering kernel (Li-Sparse)

References

Robert J. D. Spurr, “A new approach to the retrieval of surface properties from earthshine measurements”, Journal of Quantitative Spectroscopy & Radiative Transfer, vol. 83, pp. 15-46, Oct. 9, 2002. doi:10.1016/S0022-4073(02)00283-2 url: http://www.sciencedirect.com/science/article/pii/S0022407302002832