create_daylength_df: Create a data frame of day lengths

In barrks: Calculate Bark Beetle Phenology Using Different Models

Create a data frame of day lengths

Description

Generate a data frame of day lengths for given latitudes. The package geosphere is required to use this function.

Usage

create_daylength_df(lat, dates, .quiet = FALSE)

Arguments

lat	Data frame with the fields station and lat. Defines the latitude for the respective stations.
dates	Dates that should be processed.
.quiet	If TRUE, messages are suppressed.

Value

A data frame with the columns date, station and daylength.

See Also

create_daylength_rst()

Examples

# dates of interest
date_start <- as.Date('2020-01-01')
date_end <- as.Date('2020-12-31')


# calculate day length
dl <- create_daylength_df(barrks_data('station_coords'),
                          seq(date_start, date_end, by = 'day'),
                          .quiet = TRUE)

# print day lengths of station 'Freiburg'
dl[dl$station == 'Freiburg',]

barrks documentation built on April 3, 2025, 9:47 p.m.