water (version 0.5)

dailyET: Calculates daily ET using Penman Monteith hourly formula for every hour

Description

Calculates daily ET using Penman Monteith hourly formula for every hour

Usage

dailyET(WeatherStation, DOY, height, lat, long, elev, ET = "ETr", long.z = WeatherStation$long, date = "auto", MTL)

Arguments

WeatherStation

a data frame with all the needed fields (see example)

DOY

day of year

height

weather station sensors height in meters

lat

latitude in decimal degrees of the weather station

long

longitude in decimal degrees of the weather station

elev

elevation in meters of the weather station

ET

"ETo" for short crops, similar to clipped, cool-season grass; or "ETr" for tall crops, similar to 0.5 m tall full-cover alfalfa.

long.z

longitude for local time

date

if date == "auto" will use a MTL file provided or present in the working folder to select the date.

MTL

Metadata file. If not provided will look for one on working directory. If provided or present will calculate weather conditions on satellite overpass.

Value

ET daily in mm.h-1

References

Allen 2005 ASCE

Examples

csvfile <- system.file("extdata", "apples.csv", package="water")

WeatherStation <- read.WSdata(WSdata = csvfile, date.format = "%d/%m/%Y", 
lat=-35.42222, long= -71.38639, elev=201, height= 2.2, cf=c(1,0.2777778,1,1))

dailyET(WeatherStation = WeatherStation, lat=-35.422, long=-71.386, elev=124, 
ET="ETo")