This class stores G1SST model-satellite products.
dataAs with all oce objects, the data slot
for g1sst objects is a
list containing the main data for the object.
metadataAs with all oce objects, the metadata slot
for g1sst objects is a list containing
information about the data or about the object itself.
processingLogAs with all oce objects, the processingLog slot
for g1sst 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 g1sst objects (see [[<-,g1sst-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 g1sst
object named g1sst may be retrieved in the standard R way. For example,
slot(g1sst, "data") and slot(g1sst, "metadata") return
the data and metadata slots, respectively. The
[[,g1sst-method operator can also be used to access slots,
with g1sst[["data"]] and g1sst[["metadata"]], respectively.
Furthermore, [[,g1sst-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.
G1SST is an acronym for global 1-km sea surface temperature, a product
that combines satellite data with the model output. It is provided by
the JPO ROMS (Regional Ocean Modelling System) modelling group.
See the JPL website [1] to learn more about the data, and see
the read.g1sst documentation for an example
of downloading and plotting.
It is important not to regard G1SST data in the same category as,
say, amsr-class data, because the two products
differ greatly with respect to cloud cover. The satellite used by
amsr-class has the ability to sense water temperature
even if there is cloud cover, whereas g1sst fills in cloud
gaps with model simulations. It can be helpful to consult
[1] for a given time, clicking and then unclicking the radio button
that turns off the model-based filling of cloud gaps.
1. JPO OurOcean Portal http://ourocean.jpl.nasa.gov/SST/
(link worked in 2016 but was seen to fail 2017 Feb 2).
Other things related to satellite data: plot,satellite-method,
read.g1sst, satellite-class,
summary,satellite-method