Skip to content

abstract objectType Observation

extends CaomEntity

The observation is the top-level metadata structure that describes astronomical data in a data collection.

Observationivoa:string collectionivoa:anyURI uriivoa:string uriBucketivoa:datetime metaReleaseivoa:integer sequenceNumberivoa:string typecaom2:ObservationIntentType intentivoa:anyURI metaReadGroupsCaomEntityEntitySimpleObservationDerivedObservationAlgorithmTelescopeInstrumentEnvironmentProposalTargetTargetPositionRequirementsPlanealgorithm1telescope0..1instrument0..1environment0..1proposal0..1target0..1targetPosition0..1requirements0..1planes0..*

Members

name type mult description
collection ivoa:string The name of the data collection to which this observation belongs.
uri ivoa:anyURI A unique logical identifier for this observation. (NEW in CAOM-2.5) TODO: limit this to one of two forms that support use cases?
uriBucket ivoa:string This is a short string of hexadecimal digits generated from the uri to support operational use cases (mainly: dividing workload to perform validation in parallel). The value is the first three characters of the hexadecimal representation of SHA-1 of the UTF-8 encoded bytes of the Observation.uri value. (NEW in CAOM-2.5)
metaRelease ivoa:datetime optional This timestamp specifies the point where the metadata for the observation instance is public (can be viewed by anonymous users). A null value means the metadata is nont public.
sequenceNumber ivoa:integer optional a collection-specific sequence number for observations; re-use or reset is collection specific
type ivoa:string optional This describes the general purpose of observation (e.g. FITS OBSTYPE keyword). Existing usage is usually OBJECT for intent = science and other values for intent = calibration.
intent ObservationIntentType This is an enumeration that describes the intent of the original creator of the observation.
metaReadGroups ivoa:anyURI 0 or more This is a set of groups with read permission on observation metadata for cases when the metadata is non-public (see metaRelease above).
algorithm Algorithm This provides information about the algorithm or process that created this observation.
telescope Telescope optional Information about the telescope or facility where this observation was created.
instrument Instrument optional Information about the instrument or detector used to acquire the data.
environment Environment optional Information about the environmental conditions at the time of observation.
proposal Proposal optional Information about the science proposal that motivated the creation of this observation.
target Target optional Information about the intended target of the observation.
targetPosition TargetPosition optional Information about the intended target position for this observation. This may differ from the coordinates of the target object itself.
requirements Requirements optional Information about the observational requirements specified by the observer or proposal and whether this observation satisfies those requirements.
planes Plane 0 or more The planes within an observation are the different data products that are produced from the observation. For SimpleObservation, there are usually different planes for raw data, calibrated data, etc.