get_DayTimeLimits {RchivalTag} | R Documentation |
Estimating the timing of sunrise, sunset, astronomical and nautical twilight events
Description
Estimating the timing of sunrise, sunset, astronomical and nautical twilight events in POSIXct
-format based on geolocations and a similar time vector. The function is a simplified call of the sunriset and crepuscule functions of the maptools-package that are based on algorithms provided by the National Oceanic & Atmospheric Administration (NOAA).
Usage
get_DayTimeLimits(pos)
Arguments
pos |
a data.frame with the columns |
Value
The input data.frame pos
extended by the time vectors sunrise
, sunset
, dawn.naut
, dawn.ast
, dusk.naut
and dusk.ast
.
Author(s)
Robert K. Bauer
References
Meeus, J. (1991) Astronomical Algorithms. Willmann-Bell, Inc.
See Also
sunriset, crepuscule, classify_DayTime
Examples
#### example 1) estimate current times of dawn, sunrise, dusk and sunset in Mainz, Germany:
pos <- data.frame(Lat=8.2667, Lon=50)
pos$datetime <- strptime(Sys.Date(),"%Y-%m-%d")
get_DayTimeLimits(pos)
#### example 1b) classify current ime of the day in Mainz, Germany:
classify_DayTime(get_DayTimeLimits(pos))
[Package RchivalTag version 0.1.9 Index]