metadata,
data and processingLog.pt[["time"]], where the
string could also be "latitude" or "longitude". The profile
data are available in "salinity", "temperature" and
"pressure", each of which is a matrix with first index corresponding
to depth and second index corresponding to profile number. Assignment to
these can be made with e.g. drifter[["latitude"]] <- value, etc.
Indeed, any quantity in the metadata slot or the data slot
can be retrieved or updated in this way.drifter object may be read with read.drifter or
created with as.drifter. Plots can be made with
plot.drifter, while summary.drifter produces
statistical summaries and show produces overviews.