The contents are as follows; other items in the original data file are ignored.
time
: time of observation, in POSIXct()
format.
wind
: wind speed in m/s.
direction
: direction from which the wind is blowing, measured in degrees clockwise of true North.
gust
: gust speed in m/s.
height
: wave height in metres.
period
: wave period in seconds.
pa
: atmospheric pressure in kPa.
Ta
: air temperature in degC.
Tw
: water temperature in degC.
The data were downloaded as a file named 44258.txt
in April 2014 from
Reference 1, and made into a data frame.
See References 2 and 3 for information on the data in such buoys, and 4 for more
on this particular buoy.
The code to create the dataset is given below.
d <- read.table("44258.txt", stringsAsFactors=FALSE, skip=2)
t <- ISOdatetime(d[,1], d[,2], d[,3], d[,4], d[,5], 0, tz="UTC")
o <- order(t)
# handle missing data
d[d == "MM"] <- NA
# put oldest first
t <- t[o]
d <- d[o,]
direction <- as.numeric(d[,6])
wind <- as.numeric(d[,7])
gust <- as.numeric(d[,8])[o]
height <- as.numeric(d[,9])
period <- as.numeric(d[,10])
pa <- as.numeric(d[,13])
Ta <- as.numeric(d[,14])
Tw <- as.numeric(d[,15])