Usage
calcH(anchors, method = "mean", Ts, Z.om, WeatherStation, ETp.coef = 1.05, Z.om.ws = 0.03, mountainous = FALSE, DEM, Rn, G, verbose = FALSE, maxit = 20)
Arguments
anchors
anchors points. Can be the result from calcAnchors() or
a spatialPointDataframe o Dataframe with X, Y, and type. type should be
"cold" or "hot"
method
Method when using more than 1 pair of anchors pixels.
method = "mean" will use the mean value for the cold pixels vs the mean value
for the hot pixels.
Ts
Land surface temperature in K. See surfaceTemperature()
Z.om
momentum roughness lenght. See momentumRoughnessLength()
WeatherStation
WeatherStation data at the satellite overpass.
Can be a waterWeatherStation object calculated using read.WSdata and MTL file
ETp.coef
ETp coefficient usually 1.05 or 1.2 for alfalfa
Z.om.ws
momentum roughness lenght for WeatherStation. Usually
a value of 0.03 might be reasonable for a typical agricultural weather station
sited over vegetation that is about 0.3 m tall. For clipped grass, use 0.015 m
mountainous
Logical. If TRUE heat transfer equation will be
adjusted for mountainous terrain
DEM
Digital Elevation Model in meters.
Rn
Net radiation. See netRadiation()
G
Soil Heat Flux. See soilHeatFlux()
verbose
Logical. If TRUE will print information about every
iteration to console
maxit
Maximun number of iteration. Default 20.