gseason_day: gseason_day: Determine daytime hours

In ilyamaclean/climvars: Functions for calculating biologically meaningful climate variables

Description

gseason_day is used to calculate daytime (1) and non-daytime (0) hours.

Usage

gseason_day(tme, lat, long, merid = 0, dst = 0)

Arguments

tme	a POSIXlt object.
lat	latitude of the location for which gseason_day is required.
long	longitude of the location for which gseason_day is required.
merid	an optional numeric value representing the longitude (decimal degrees) of the local time zone meridian (0 for GMT). Default is 0.
dst	an optional numeric value representing the time difference from the timezone meridian (hours, e.g. +1 for BST if merid = 0). Default is 0.

Value

a vector of binary values indicating day (1) or night (0).

See Also

the tmecreate() function can be used to create a POSIXlt object.

Requires wrapper function sisimple to be loaded.

Examples

Daytime hours in Porthleven, Cornwall for 2010.
tme <- tmecreate(2010, 1)
gseason_day(tme, 50.08, -5.31)

ilyamaclean/climvars documentation built on June 19, 2019, 2:22 p.m.