Incidence: Solar Incidence Angle

In bnasr/solrad: Calculating Solar Radiation and Related Variables Based on Location, Time and Topographical Conditions

Description

This function returns solar incidence angle (in degrees) for a given day of year and location and site slope and aspect. The solar incidence angle is the angle between sun's ray and the normal on a surface.

Usage

Incidence(DOY, Lat, Lon, SLon, DS, Slope, Aspect)

Arguments

DOY	Day of year
Lat	Latitude (in degrees)
Lon	Longitude in degrees
SLon	Standard longitude (based on time zone) in degrees
DS	Daylight saving in minutes
Slope	Site slope in degrees
Aspect	Site aspect with respect to the south in degrees

Examples

#Calculating solar incidence angle for two consecutive days on 45 degree latitude and
# 10 degree longitude

DOY <- seq(0, 2, .05)

theta <- Incidence(DOY, Lat = 45, Lon=10, SLon=10, DS=0, Slope = 10, Aspect = 0)
#Note: only the difference between Lon and SLon matters not each value

plot(DOY, theta)

bnasr/solrad documentation built on May 20, 2019, 3:05 p.m.