resourcecode (version 0.5.3)

get_1d_spectrum: Download the 1D spectrum data from IFREMER ftp

Description

Download the 1D spectrum data from IFREMER ftp

Usage

get_1d_spectrum(point, start = "1994-01-01", end = "1994-02-28")

Value

A list with 12 elements:

longitude

Longitude

latitude

Latitude

frequency1

Lower frequency

frequency2

Upper frequency

ef

Surface elevation variance spectral density

th1m

Mean direction from first spectral moment

th2m

Mean direction from second spectral moment

sth1m

Mean directional spreading from first spectral moment

sth2m

Mean directional spreading from second spectral moment

freq

Central frequency

forcings

A data.frame with 14 variables:

time

Time

dpt

Depth, positive downward

wnd

Wind intensity, at 10m above sea level

wnddir

Wind direction, comes from

cur

Current intensity, at the surface

curdir

Current direction, going to

hs

Significant wave height

fp

Peak wave frequency

f02

Mean wave frequency

f0m1

Mean wave frequency at spectral moment minus one

th1p

Mean wave direction at spectral peak

sth1p

Directional spreading at spectral peak

dir

Mean wave direction

spr

Mean directional spreading

station

Station name

Arguments

point

the location name (string) requested. Alternatively, the node number. The consistency is checked internally.

start

the starting date (as a string). The consistency is checked internally.

end

the ending date as a string

Examples

spec1D <- get_1d_spectrum("SEMREVO", start = "1994-01-01", end = "1994-02-28")
if(!is.null(spec1D)){
  r <- as.POSIXct(round(range(spec1D$forcings$time), "month"))
  image(spec1D$forcings$time, spec1D$freq, t(spec1D$ef),
    xaxt = "n", xlab = "Time",
    ylab = "Frequency (Hz)"
  )
  axis.POSIXct(1, spec1D$forcings$time,
    at = seq(r[1], r[2], by = "week"),
    format = "%Y-%m-%d", las = 2
  )
}