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Compute incoming radiation (J day-1 m-2 ) at the top of the atmosphere and photoperiod (daylength, sunshine duration).
ExtraTerrestrialRadiation(doy, latitude, sc=1367.7, FAO=FALSE)
matrix with incoming radiation (J/day) and
integer. Day of the year
numeric. Latitude
numeric. The solar constant
logical. If TRUE the algorithm described by Allen et al (1998) is used. If FALSE the approach by Goudriaan and Van Laar (1995) is used
TRUE
FALSE
Robert Hijmans, based on Python meteolib by Maarten J. Waterloo and J. Delsman http://python.hydrology-amsterdam.nl/
Goudriaan and Van Laar, 1995.
R.G. Allen, L.S. Pereira, D. Raes and M. Smith (1998). Crop Evaporation - Guidelines for computing crop water requirements. Irrigation and drainage paper 56. FAO, Rome, Italy. https://www.fao.org/3/x0490e/x0490e07.htm
ExtraTerrestrialRadiation(50, 60) ExtraTerrestrialRadiation(50, 60, FAO=TRUE)
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