lidf: Leaf inclination distribution function models s3 method for...

In MarcoDVisser/ccrtm: Coupled Chain Radiative Transfer Models

Leaf inclination distribution function models s3 method for calling leaf models.

Description

Leaf inclination distribution function models s3 method for calling leaf models.

Usage

lidf(pars)

Arguments

pars

a parameter vector c(angles, LIDFa, LIDFb) with a class lidf.modelnumber. Models include: 1 = Dlagden distribution (1, lidf.1) 2 = Ellipsoid (Campebll) distribution (2, lidf.2) 3 = Beta distribution (3, lidf.3) 4 = One parameter beta distribution (4, lidf.4) Models 1 and 2 are the standard models from the SAIL model. Two parameter models use parameters LIDFa and LIDFb, while single parameter models use only LIDFa (ignoring any supplied LIDFb). More information on the Dlagden and Ellipsoid parameter is given in Verhoef, W. (1998),theory of radiative transfer models applied in optical remote sensing of vegetation canopies (PhD thesis). The beta distribution is the typical beta distribution as often implemented (as in dbeta(x,LIDFa, LIDFb)). Where x is a value between 0 and 90, that gives the angular density over 0 and 90 degrees (rescaled to 0 and 1). The one parameter beta distribution is given by LIDFa*x^(LIDFa-1). Where x is a value between 0 and 90, that given the angular density over 0 and 90 degrees (rescaled to 0 and 1).

Value

a vector of proportions for each leaf angle calculated from each leaf inclination model.

MarcoDVisser/ccrtm documentation built on Feb. 19, 2025, 1:15 p.m.