flim {ccrtm}

Forest Light Interaction Model (FLIM)

Description

The FLIM model was first described by Rosema et al (1992). In FLIM forests are assumed a discontinous mix of tree crowns and gaps. Reflectance is modelled in terms of the probabilty to observe either a gap (background) or a tree crown. Both gaps and crowns may be shaded.

Usage

flim(Rc, Rg, To = NULL, Ts = NULL, params, area = 10000)

Arguments

Rc

Canopy reflectance at infinite depth

Rg

soil/background reflectance

To

transmission in viewing direction

Ts

transmission in sun direction

params

a named vector of parameters:

• [1] = D, stand density (confounded with cd)

• [2] = cd, crown diameter (confounded with D)

• [3] = h, mean crown height

• [6] = Solar zenith angle (tts)

• [7] = Observer zenith angle (tto)

• [8] = Sun-sensor azimuth angle (psi)

area

area of stand

Details

Confounded parameters pairs cannot be inversely estimated, one of the pairs should be set to 1.

Value

a list with reflectance, and the fractions of shaded and sunexplosed crowns, shaded and sun exposed open space.

References

Rosema, A., Verhoef, W., Noorbergen, H., Borgesius, J.J. (1992). A new forest light interaction model in support of forest monitoring. Remote Sens. Environ. 42, 23-41.