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ccrtm (version 0.1.6)

Coupled Chain Radiative Transfer Models

Description

A set of radiative transfer models to quantitatively describe the absorption, reflectance and transmission of solar energy in vegetation, and model remotely sensed spectral signatures of vegetation at distinct spatial scales (leaf,canopy and stand). The main principle behind ccrtm is that many radiative transfer models can form a coupled chain, basically models that feed into each other in a linked chain (from leaf, to canopy, to stand, to atmosphere). It allows the simulation of spectral datasets in the solar spectrum (400-2500nm) using leaf models as PROSPECT5, 5b, and D which can be coupled with canopy models as 'FLIM', 'SAIL' and 'SAIL2'. Currently, only a simple atmospheric model ('skyl') is implemented. Jacquemoud et al 2008 provide the most comprehensive overview of these models .

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Install

install.packages('ccrtm')

Monthly Downloads

220

Version

0.1.6

License

GPL (>= 2)

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Maintainer

Marco Visser

Last Published

February 26th, 2021

Functions in ccrtm (0.1.6)

flim

Forest Light Interaction Model (FLIM)
fRTM

Forward implementation of coupled Radiative Transfer Models.
KLd

Kullback-Lieber divergence function D(spec1 || spec2) = sum(spec1 * log(spec1 / spec2))
bRTM

Generates an invertable model for backward implementation of Radiative Transfer Models
ccrtm

ccrtm: Coupled Chain Radiative Transfer Models.
cdcum

Leaf inclination distribution function cummulative lagden function from Wout Verhoef's dissertation Extended here for any angle
cambell

Leaf inclination distribution function Ellipsoidal distribution function
data_prospectd

refractive index and specific absorption coefficient for PROSPECT D
data_prospect5

refractive index and specific absorption coefficient for PROSPECT 5
foursail2b

R implementation of the foursail2 model with 2 canopy layers.
soil

soil reflectance
skyl

Sky light model
foursail2

R implementation of the foursail2 model with 2 canopy layers.
foursail

Optimized R implementation of foursail (4SAIL)
getDefaults

S3- methods for Generate defaults settings and parameters for all supported models.
r_foursail

R implementation of foursail (pure R)
lidf

Leaf inclination distribution models s3 method for calling leaf models
prospectd

PROSPECT model version D
prospect5

PROSPECT model version 5 and 5B
solar

direct and diffuse light
print.rtm.spectra

Plot RTM return spectra vs. wavelength
sail_BDRF

The SAIL BDRF function
plot.rtm.spectra

Plot RTM return spectra vs. wavelength