Rso | R Documentation |
Clear-sky solar radiation for daily and shorter periods.
Rso( x, lat.rad = NULL, lat.deg = NULL, long.deg = NULL, elev, tl, control = list(Lz = 345) )
x |
date-time object or day of the year (must be date-time object if calculation period is shorter than a day) |
lat.rad |
latitude [rad]. Use either lat.rad or lat.deg. Latitude is positive for the northern and negative for the southern hemisphere |
lat.deg |
latitude [degree]. Use either lat.deg or lat.rad. Latitude is positive for the northern and negative for the southern hemisphere |
long.deg |
longitude of the measurement site (degrees east of Greenwich) (only needed for periods < 1 day) |
elev |
station elevation above sea level [m] |
tl |
length of calculation period [hour] (1 for hourly period, 0.5 for a 30-minute period or 24 for daily period). |
control |
list for control parameters and empirical factors defined in
|
must be provided as.numeric (1-366) or as a common date-time object (e.g, POSIXct, POSIXlt, and Date objects). All formats for which is.timepoint from the lubridate package returns TRUE can be used
Lz:
longitude of the centre of the local time zone (degrees west of Greenhich)
- 0 for Greenwich
- 345 for Germany
- 330 for Cairo (Egypt)
- 255 for Bangkok (Thailand)
- 75, 90, 105 and 120 for Eastern, Central, Rocky Mountain and Pacific time zones (United States)
Lz is only needed if calculation period is shorter 1 day.
for day, hour and shorter periods
eq. 37; Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56. FAO, Rome, 300(9).
# -------------------------------------------- # Daily period # -------------------------------------------- Rso(x = 135, elev = 1, lat.deg = -22.9) # -------------------------------------------- # Hourly period # -------------------------------------------- Rso(x = as.POSIXct('2018-10-01 12:30'), tl = 1, elev = 8, lat.deg = 16.2, long.deg = 343.75, control = list(Lz = 15))
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