| section-class {oce} | R Documentation |
This class stores data from oceanographic section surveys.
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.
dataAs with all oce objects, the data slot
for section objects is a
list containing the main data for the object.
metadataAs 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.
processingLogAs 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.
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.
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.
Dan Kelley
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
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)