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.
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.
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)