oce (version 1.0-1)

section-class: Class to Store Hydrographic Section Data

Description

This class stores data from oceanographic section surveys.

Slots

data

As with all oce objects, the data slot for section objects is a list containing the main data for the object.

metadata

As with all oce objects, the metadata slot for section objects is a list containing information about the data or about the object itself. Examples that are of common interest include stationId, longitude, latitude and time.

processingLog

As with all oce objects, the processingLog slot for section objects is a list with entries describing the creation and evolution of the object. The contents are updated by various oce functions to keep a record of processing steps. Object summaries and processingLogShow both display the log.

Modifying slot contents

Although the [[<- operator may permit modification of the contents of section objects (see [[<-,section-method), it is better to use oceSetData and oceSetMetadata, because that will save an entry in the processingLog to describe the change.

Retrieving slot contents

The full contents of the data and metadata slots of a section object named section may be retrieved in the standard R way. For example, slot(section, "data") and slot(section, "metadata") return the data and metadata slots, respectively. The [[,section-method operator can also be used to access slots, with section[["data"]] and section[["metadata"]], respectively. Furthermore, [[,section-method can be used to retrieve named items (and potentially some derived items) within the metadata and data slots, the former taking precedence over the latter in the lookup. It is also possible to find items more directly, using oceGetData and oceGetMetadata, but this cannot retrieve derived items.

Details

Sections can be read with read.section or created with read.section or created from CTD objects by using as.section or by adding a ctd station to an existing section with sectionAddStation.

Sections may be sorted with sectionSort, subsetted with subset,section-method, smoothed with sectionSmooth, and gridded with sectionGrid. Gridded sections may be plotted with plot,section-method.

Statistical summaries are provided by summary,section-method, while overviews are provided by show.

The sample dataset section contains data along WOCE line A03.

See Also

Other classes provided by oce: adp-class, adv-class, argo-class, bremen-class, cm-class, coastline-class, ctd-class, lisst-class, lobo-class, met-class, oce-class, odf-class, rsk-class, sealevel-class, topo-class, windrose-class

Other things related to section data: [[,section-method, [[<-,section-method, as.section, handleFlags,section-method, initializeFlagScheme,section-method, plot,section-method, read.section, sectionAddStation, sectionGrid, sectionSmooth, sectionSort, section, subset,section-method, summary,section-method

Examples

# NOT RUN {
library(oce)
data(section)
plot(section[['station', 1]])
pairs(cbind(z=-section[["pressure"]],T=section[["temperature"]],S=section[["salinity"]]))
## T profiles for first few stations in section, at common scale
par(mfrow=c(3,3))
Tlim <- range(section[["temperature"]])
ylim <- rev(range(section[["pressure"]]))
for (stn in section[["station", 1:9]])
    plotProfile(stn, xtype='potential temperature', ylim=ylim, Tlim=Tlim)

# }