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#' Res_soil - Calculates soil resistance on an hourly basis
#' @param x A data frame containing hourly data of weather and other variables (e.g. Hum (\%), Pres (kPa), Precip (mm), Rad (W m-2), Temp (C), Wind (m s-1), Daylight (Night or Daylight), BAI, LAI)
#' @param r_soil_inleaf Resistance value during in-leaf season
#' @param r_soil_outleaf Resistance value during in-leaf season
#' @return Hourly data of soil resistance (s m-1)
#' @export
#'
#' @examples
#'
#' data(Bizkaia_data)
#' Res_soil(x = Bizkaia_data, r_soil_inleaf = 2941, r_soil_outleaf = 2941)
Res_soil <- function(x,
r_soil_inleaf = 2941,
r_soil_outleaf = 2941){
db <- x
#r_soil_inleaf <- 2941 # s/m
#r_soil_outleaf <- 2941 # 2000 # s/m
LAI_Total <- db$BAI + db$LAI
if((max(LAI_Total, na.rm=T) == min(LAI_Total, na.rm=T)) &
(r_soil_inleaf == r_soil_outleaf)){
r_soil0 <- rep(r_soil_inleaf, nrow(db))
r_soil <- cbind.data.frame(Dates = db$Dates, Resist_soil = r_soil0)
}else{
fit_r_soil <- lm(c(r_soil_inleaf,r_soil_outleaf)~c(max(LAI_Total, na.rm=T),min(LAI_Total, na.rm=T)))
r_soil0 <- fit_r_soil$coefficients[1]+fit_r_soil$coefficients[2]*LAI_Total
r_soil <- cbind.data.frame(Dates = db$Dates, Resist_soil = r_soil0)
}
return(r_soil)
}
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