g1sst-class: Class to Store G1SST Satellite-model Data

Description Details Slots Modifying slot contents Retrieving slot contents Author(s) References See Also

Description

This class stores G1SST model-satellite products.

Details

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.

Slots

data

As with all oce objects, the data slot for g1sst objects is a list containing the main data for the object.

metadata

As with all oce objects, the metadata slot for g1sst objects is a list containing information about the data or about the object itself.

processingLog

As 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.

Modifying slot contents

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.

Retrieving slot contents

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.

Author(s)

Dan Kelley

References

1. JPO OurOcean Portal http://ourocean.jpl.nasa.gov/SST/ (link worked in 2016 but was seen to fail 2017 Feb 2).

See Also

Other things related to satellite data: plot,satellite-method, read.g1sst, satellite-class, summary,satellite-method


oce documentation built on Oct. 4, 2018, 5:04 p.m.