siflat: Calculates the solar index for a flat surface

In ilyamaclean/microclima: microclimate modelling with R

Calculates the solar index for a flat surface

Description

Calculates the solar index for a flat surface

Usage

siflat(localtime, lat, long, julian, merid = round(long/15, 0) * 15, dst = 0)

Arguments

localtime	local time (decimal hour, 24 hour clock).
lat	latitude of the location for which the solar altitude is required (decimal degrees, -ve south of the equator).
long	longitude of the location for which the solar altitude is required (decimal degrees, -ve west of Greenwich meridian).
julian	Julian day expressed as an integer as returned by julday().
merid	an optional numeric value representing the longitude (decimal degrees) of the local time zone meridian (0 for GMT). Default is round(long / 15, 0) * 15
dst	an optional numeric value representing the time difference from the timezone meridian (hours, e.g. +1 for BST if merid = 0).

Value

a numeric value representing the solar altitude (º).

Examples

# solar index at noon GMT on 21 June 2010, Porthleven, Cornwall
jd <- julday (2010, 6, 21) # Julian day
siflat(12, 50.08, -5.31, jd)

ilyamaclean/microclima documentation built on Oct. 31, 2023, 11:41 p.m.