Secchi depth dataset

Source: R/secchi.R

Measurements of Secchi depth in the North and Baltic Seas.

data(secchi, package="ocedata")

Details

The data were downloaded as a file named Secchi_Ships.csv that was available from Reference 1 in October 2013 and then formed into a data frame with new variable names, for use in R. See Thorkild (2002) for more information on the data.

References

  1. https://ocean.ices.dk/Project/SECCHI/ (noticed to be a broken link on March 13, 2022).

  2. Thorkild Aarup 2002, Transparency of the North Sea and Baltic Sea--a Secchi Depth data mining study, Oceanologia, 44(3), 323-337.

Examples

data(coastlineWorldMedium, package="ocedata")
data(secchi, package="ocedata")
if (FALSE) {
logdepth <- log10(secchi$depth)
cm <- colormap(logdepth, col=oceColorsTurbo)
par(mar=c(3, 3, 2, 1))
oce::drawPalette(colormap=cm)
oce::plot(coastlineWorldMedium, clongitude=10, clatitude=60, span=3000,
    mar=par("mar"))
points(secchi$longitude, secchi$latitude, pch=20, col=cm$zcol)
title("log10 of secchi depth in m")
}