leafrfromalb: Derives leaf and ground reflectance from albedo

In ilyamaclean/microclimf: Fast above, below or within canopy gridded microclimate modelling with R

Derives leaf and ground reflectance from albedo

Description

Derives leaf and ground reflectance from albedo

Usage

leafrfromalb(pai, x, alb, ltrr = 0.5)

Arguments

pai	a SpatRaster of plant area index values
x	a SpatRaster of the ratio of vertical to horizontal projections of leaf foliage
alb	a SpatRaster of white-sky albedo
ltrr	an optional numeric value giving an approximate estimate of the ratio of leaf transmittance to leaf reflectance (e.g. value of 1 makes leaf transmittance equal to reflectance). See details

Details

the microclimate model is not unduly sensitive to 'lttr' so if unknown, an approximate value or the default can be used.

Value

a list of the following

leafr

Leaf reflectance (range 0 - 1)

leaft

Leaf transmittance (range 0 - 1)

gref

Ground reflectance (range 0 - 1)

Examples

pai <- rast(vegp$pai)[[9]] # Plant Area Index in Sep (month in which albedo image was flown)
x <- rast(vegp$x)
alb <- rast(albedo)
lgr <- leafrfromalb(pai, x, alb)
plot(lgr$leafr)
plot(lgr$gref)

ilyamaclean/microclimf documentation built on Sept. 28, 2024, 4:55 p.m.