Description Usage Arguments Details Author(s) References See Also Examples
Calculates Daily Extraterrestrial radiation (DER) according to the formules indicated by FAO and Daily Potential Evapotranspiration (ET) according to Hargerves' formula and Drought Daily Index (DDI) and Daily Dew Point Temperature (TDEW)
1 2 3 4 5 6 7 8 9 10 11 12 13 | DER(doy = 1, lat = 46, unit = "MJ_per_square_meter_per_day",
vaporization_latent_heat = 2.45, divide_by_latent_heat = FALSE)
ET(doy = 1, lat = 46, vaporization_latent_heat = 2.45, Tn = 10,
Tx = 20, Tmean = 14)
DDI(doy = 1, lat = 46, vaporization_latent_heat = 2.45, Tn = 10,
Tx = 20, Tmean = 14, prec = 0, lag = 6, DDI_lim = c(0, 0.5, 1, 3),
ops = "/")
TDEW(doy = 1, lat = 46, vaporization_latent_heat = 2.45, Tn = 10,
Tx = 20, Tmean = 14, prec = 0, lag = 6, valmin_prec = 0.5,
intercept_prec, intercept_noprec, coeff_prec, coeff_noprec, DDI_lim = NULL)
|
doy |
day of the year |
lat |
latitude expressed in degrees North |
unit |
output measurement unit |
vaporization_latent_heat |
water vaporization latent heat expressed in MJ per Kg. Default is 2.45. |
divide_by_latent_heat |
logical values. If
|
prec |
daily precipitation expressed in mm |
Tx,Tn,Tmean |
Daily Maximum, Minimun and Mean Temperature expressed in Celsius Degrees |
DDI_lim |
a vector in case |
ops |
operation used for |
lag |
number of days used for calculation of DDI. See reference. |
valmin_prec |
precipitation threshold value under which no daily precipitation is considered. Default is 0.5 mm. |
intercept_prec,intercept_noprec,coeff_prec,coeff_noprec |
values for piecewise linear function for dew temperature correctio. See FAO method in the Reference. |
These functions implement the theory illustrated in the following paper: from http://onlinelibrary.wiley.com/doi/10.1002/met.258/abstract
Emanuele Cordano
See the URLs in DESCRIPTION files
1 | # See examples in "air_humidity" function
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