This class stores data from the AMSR-2 satellite.
dataAs with all oce objects, the data slot
for amsr objects is a
list containing the main data for the object.
metadataAs with all oce objects, the metadata slot
for amsr objects is a list containing
information about the data or about the object itself.
Examples that are of common interest include longitude and latitude, which define the grid.
processingLogAs with all oce objects, the processingLog slot
for amsr 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 amsr objects (see [[<-,amsr-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 amsr
object named amsr may be retrieved in the standard R way. For example,
slot(amsr, "data") and slot(amsr, "metadata") return
the data and metadata slots, respectively. The
[[,amsr-method operator can also be used to access slots,
with amsr[["data"]] and amsr[["metadata"]], respectively.
Furthermore, [[,amsr-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.
The Advanced Microwave Scanning Radiometer (AMSR-2) is in current operation on
the Japan Aerospace Exploration Agency (JAXA) GCOM-W1 space craft, launched in
May 2012. Data are processed by Remote Sensing Systems. The satellite
completes an ascending and descending pass during local daytime and nighttime
hours respectively. Each daily file contains 7 daytime and 7 nighttime
maps of variables named as follows within the data
slot of amsr objects: timeDay,
SSTDay, LFwindDay (wind at 10m sensed in
the 10.7GHz band), MFwindDay (wind at 10m sensed at 18.7GHz),
vaporDay, cloudDay, and rainDay, along with
similarly-named items that end in Night.
See [1] for additional information on the instrument, how
to cite the data source in a paper, etc.
The bands are stored in raw form, to save storage. The accessor
function [[,amsr-method can provide these values in raw
form or in physical units; plot,amsr-method, and
summary,amsr-method work with physical units.
1. Information on the satellite, how to cite the data, etc. is
provided at http://www.remss.com/missions/amsr/.
2. A simple interface for viewing and downloading data is at
http://images.remss.com/amsr/amsr2_data_daily.html.
landsat-class for handling data from the Landsat-8 satellite.
Other things related to amsr data: [[<-,amsr-method,
composite,amsr-method,
download.amsr,
plot,amsr-method, read.amsr,
subset,amsr-method,
summary,amsr-method