Plot tide height and daylight hours

plot_tide_sun() Creates a plot with vertical background stripes indicating daylight hours and a line indicating tide height. Due to a limitation in rtide it doesn't work with most of the Buzzards Bay tide stations.

Usage

plot_tide_sun(d, station, lat, lon, tz)

Arguments

d

A data frame containing the DO and other data for which a companion Daylight and Tide height plot is needed. Only the column Date_Time is used BUT it is assumed that the interval between observations is consistent in the file.

station

The tide station name for which the plot should be made

lat, lon

The latitude and longitude of the site - used for daylight hour calculations.

tz

The HOBOware style "timezone" associated with the Date_Time column e.g. "GMT-4:00". Note, in general in the BuzzardsBay package Date Time objects are stored as a string "2024-05-31 6:00:00" or converted to a POSIX object WITHOUT a defined timezone. The "Timezone" as used by HOBOware is saved in the metadata object and is an offset from GMT/UTC and NOT a TRUE timezone. Passing this offset as tz allows the local date times to to be converted to their UTC equivalent and the UTC timezone to be set such that they represent an accurate time + timezone for use with tide chart and daylight hour lookup.