surface_perturbation Module Reference

This module contains routines used in the percentile matching algorithm for the albedo and vegetation fraction perturbations.

Functions/Subroutines
subroutine, public	cdfnor (z, cdfz)
	This subrtouine calculates the CDF of the standard normal distribution evaluated at z.
subroutine	cdfgam (x, alpha, eps, iflag, cdfx)
subroutine	dgamln (x, dgamlnout)
subroutine, public	ppfbet (pr, p, q, iflag, x)
	This subroutine computes the beta distribution value that matches the percentile from the random pattern.
subroutine	cdfbet (x, p, q, eps, iflag, cdfx)
	This subroutine computes the value of the cumulative beta distribution at a single point x, given the distribution parameters p,q.
subroutine	gmln (x, y)
	This subroutine computes the natural logarithm of the gamma distribution. Users can set the absolute accuracy and corresponding xmin.