Details for calcH by Fernando

R/water_ET.R

@@ -141,6 +141,7 @@ ET24h <- function(Rn, G, H, Ts, WeatherStation, ETr.daily, C.rad=1){
 #' Calculates daily ET using Penman Monteith hourly formula for every hour
 #' @param WeatherStation a data frame with all the needed fields (see example)
 #' @param DOY      day of year
+#' @param height   weather station sensors height in meters
 #' @param lat      latitude in decimal degrees of the weather station
 #' @param long     longitude in decimal degrees of the weather station
 #' @param elev     elevation in meters of the weather station

R/water_sensibleHeatFlux.R

@@ -161,8 +161,17 @@ calcAnchors  <- function(image, Ts, LAI, albedo, Z.om, n=1, aoi,
 #' @param Rn             Net radiation. See netRadiation()
 #' @param G              Soil Heat Flux. See soilHeatFlux()
 #' @param verbose        Logical. If TRUE will print aditional data to console
+#' @details Sensible heat flux is the rate of heat loss to the air by convection 
+#' and conduction, due to a temperature difference.This parameter is computed using the following one-dimensional,
+#'aerodynamic,temperature gradient based equation for heat transport,this method is difficult to solve because 
+#'there are two unknowns, rah and dT. To facilitate this computation, METRIC utilize the two “anchor” 
+#'pixels  and solve for dT that satisfies eq. given the aerodynamic roughness and wind speed at a given height.
+#'Aerodynamic resistance, and heat transfer is impacted by buoyancy of heated, light air at the surface, 
+#'especially when H is large. Therefore, correction to rah is needed to account for buoyancy effects. However, 
+#'H is needed to make this correction. An iterative solution for both H and rah is used.
 #' @author Guillermo Federico Olmedo
 #' @author de la Fuente-Saiz, Daniel
+#' @author Fernando Fuentes Penailillo
 #' @references 
 #' R. G. Allen, M. Tasumi, and R. Trezza, "Satellite-based energy balance for mapping evapotranspiration with internalized calibration (METRIC) - Model" Journal of Irrigation and Drainage Engineering, vol. 133, p. 380, 2007 \cr
 #'

man/calcH.Rd

@@ -44,10 +44,22 @@ adjusted for mountainous terrain}
 \description{
 generates an iterative solution to estimate r.ah and H because both are unknown at each pixel.
 }
+\details{
+Sensible heat flux is the rate of heat loss to the air by convection
+and conduction, due to a temperature difference.This parameter is computed using the following one-dimensional,
+aerodynamic,temperature gradient based equation for heat transport,this method is difficult to solve because
+there are two unknowns, rah and dT. To facilitate this computation, METRIC utilize the two “anchor”
+pixels  and solve for dT that satisfies eq. given the aerodynamic roughness and wind speed at a given height.
+Aerodynamic resistance, and heat transfer is impacted by buoyancy of heated, light air at the surface,
+especially when H is large. Therefore, correction to rah is needed to account for buoyancy effects. However,
+H is needed to make this correction. An iterative solution for both H and rah is used.
+}
 \author{
 Guillermo Federico Olmedo
 
 de la Fuente-Saiz, Daniel
+
+Fernando Fuentes Penailillo
 }
 \references{
 R. G. Allen, M. Tasumi, and R. Trezza, "Satellite-based energy balance for mapping evapotranspiration with internalized calibration (METRIC) - Model" Journal of Irrigation and Drainage Engineering, vol. 133, p. 380, 2007 \cr

man/dailyET.Rd

@@ -12,6 +12,8 @@ dailyET(WeatherStation, DOY, height, lat, long, elev, ET = "ETo",
 
 \item{DOY}{day of year}
 
+\item{height}{weather station sensors height in meters}
+
 \item{lat}{latitude in decimal degrees of the weather station}
 
 \item{long}{longitude in decimal degrees of the weather station}