beamrad: Calculate short-wave solar irradiances
In rforge/microclim: Microclimate predictions

Description Usage Arguments Details Value Author(s) References Examples

View source: R/beamrad.R

Calculates clear-sky direct beam solar irradiance, and diffuserad diffuse radiation, for specified conditions.

1 2	beamrad(day, alt, elevation = 0, linke = 3) diffuserad(day, alt, linke = 3)

`day`	day of the year, from 1 to 365 (366 in leap years)
`alt`	angle of sun above horizon in degrees
`elevation`	height above sea level of site (default is sea level)
`linke`	the Linke turbidity factor - an index of atmospheric turbidity. If in doubt, leave it at the default of 3.

If any of the arguments comprise more than a single value, they should be equal to each other in dimensions and extent and the output will be of the corresponding size. In particular, alt could be a raster.

Short-wave radiation values in Watts per square metre.

Jon Bennie

Suri, M. & Hofierka, J. (2007) Transactions in GIS, 8: 175-190

beamrad(day=197, alt=74, elevation=0, linke=3)
beamrad(day=197, alt=0, elevation=0, linke=3)
diffuserad(day=197, alt=74, linke=3)
diffuserad(day=197, alt=0, linke=3)