SSA
xs
ssa
XML Schema used to describe the capabilities of a service instance
conforming to the Simple Spectral Access (SSA) protocol.
An abstract capability that fixes the standardID to the
IVOA ID for the SSA standard.
See vr:Capability for documentation on inherited children.
The capabilities of an SSA service implementation.
The category indicating the level to which
this instance complies with the SSA standard.
Allowed values are "minimal", "query", and "full".
See definitions of allowed values for details.
The category specifying where the data originally
came from.
Allowed values are "survey", "pointed", "custom",
"theory", "artificial"
The category that describes the process used to
produce the dataset.
Typically this describes only the processing
performed by the data service, but it could
describe some additional earlier processing as
well, e.g., if data is partially precomputed.
Allowed values are "archival", "cutout", "filtered",
"mosaic", "projection", "spectralExtraction",
"catalogExtraction"
The largest search radius, in degrees, that will be
accepted by the service without returning an error
condition.
Use 180.0 if there is no restriction.
The hard limit on the largest number of records that
the query operation will return in a single response
The largest number of records that the service will
return when the MAXREC parameter not specified
in the query input.
The largest aperture that can be supported upon
request via the APERTURE input parameter by a
service that supports the special extraction
creation method.
A value of 180 (the default) means there is no
theoretical limit.
A URI identifier for a world coordinate system
frame supported by this service.
The value SHOULD be an IVOA Identifier (with an
appended URI fragment) for a currently
registered standard frame.
lists optional named features that that the
server supports. The vocabulary of the content
The maximum image file size in bytes.
a set of query parameters that is expected to
produce at least one matched record which can be
used to test the service.
The allowed values for indicating the level at which a
service instance complies with the SSA standard.
The service supports all of the capabilities and features
of the SSA protocol identified as "must" in the
specification.
In brief, this includes:
* implementing the GET interface,
* support the parameters POS, SIZE, TOME, BAND, and
FORMAT
* includes all mandatory metadata fields in query
response
* supports getData method retrieval in at least one
SSA-compliant format
* supports the "FORMAT=METADATA" metadata query.
The service supports all of the capabilities and features
of the SSA protocol identified as "must" in the
specification, except that it does not support returning
data in at least one SSA-compliant format.
The service supports all of the capabilities and features
of the SSA protocol identified as "must" or "should" in the
specification.
The defined categories that specify where the spectral data
originally came from.
A survey dataset, which typically covers some region of
observational parameter space in a uniform fashion, with
as complete as possible coverage in the region of parameter
space observed.
A pointed observation of a particular astronomical object
or field.
Typically, these are instrumental observations taken as
part of some PI observing program. The data quality and
characteristics may be variable, but the observations of
a particular object or field may be more extensive than
for a survey.
Data which has been custom processed, e.g., as part of
a specific research project.
Theory data, or any data generated from a theoretical
model, for example a synthetic spectrum.
Artificial or simulated data.
This is similar to theory data but need not be based on
a physical model, and is often used for testing purposes.
The entire archival or project dataset is returned.
Transformations such as metadata or data model mediation
or format conversions may take place, but the content of
the dataset is not substantially modified (e.g., all the
data is returned and the sample values are not modified).
The dataset is subsetted in some region of parameter
space to produce a subset dataset. Sample values are not
modified, e.g., cutouts could be recombined to reconstitute
the original dataset.
The data is filtered in some fashion to exclude portions
of the dataset, e.g., passing only data in selected regions
along a measurement axis, or processing the data in a way
which recomputes the sample values, e.g., due to
interpolation or flux transformation.
Filtering is often
combined with other forms of processing, e.g., projection.
Data from multiple non- or partially-overlapping datasets
are combined to produce a new dataset.
Data is geometrically warped or dimensionally reduced by
projecting through a multidimensional dataset.
Extraction of a spectrum from another dataset, e.g.,
extraction of a spectrum from a spectral data cube
through a simulated aperture.
Extraction of a catalog of some form from another dataset,
e.g., extraction of a source catalog from an image, or
extraction of a line list catalog from a spectrum (not
valid for a SSA service).
A query to be sent to the service
the center position the search cone given in
decimal degrees.
the size of the search radius.
the spectal band to search, given in the format supported
by the BAND input parameter.
the size of the search radius.
any extra (particularly non-standard) parameters that must
be provided (apart from what is part of base URL given by
the accessURL element).
this value should be in the form of name=value
pairs delimited with apersands (&).
a position in the sky to search.
The longitude (e.g. Right Ascension) of the center of the
search position in decimal degrees.
The latitude (e.g. Declination) of the center of the
search position in decimal degrees.
the coordinate system reference frame name indicating
the frame to assume for the given position. If not
provided, ICRS is assumed.
a bandpass or an approximate range of frequency to search.
The minimum wavelength in the bandpass to search. If not
provided, all frequencies less than maxWavelength will be
searched.
The minimum wavelength in the bandpass to search. If not
provided, all frequencies less than maxWavelength will be
searched.
the spectral rest frame to assume while searching.
the rest frame of the emitting source object
the rest frame of the observer.
the name of a supported bandpass to search.
A range of time values that can be formed into a legal value
for the TIME input parameter.
The earliest date and time (inclusive) to search. If
not provided,no lower limit should be applied.
The value may either be just a date or a full ISO 8601,
compliant string (using the "T" data-time delimiter
with no timezone specifier).
The latest date and time (inclusive) to search. If
not provided, no lower limit should be applied.
The value may either be just a date or a full ISO 8601,
compliant string (using the "T" data-time delimiter
with no timezone specifier).