This is the beta version of CAOM documentation generated from the VO-DML description of the data model. It is currently missing some classes and descriptions and does not perfectly match the existing implementations.
| Authors | : | Patrick Dowler, Canadian Astronomy Data Centre |
| Date | : | 2017-01-26T15:00:00 |
| Version | : | 2.2 |
| Abstract | : | a general purpose data model for use as the core data model of an astronomical data centre |
The following sub-sections present all packages in the model with their types. The packages are listed here in alphabetical order. Each sub-section contains a description of the package and a table containing its various features.
| Model | caom2 | |
| child package(s) | caom2 | |
| Primitive types | uuid | |
| vodml-id | uuid |
| description | represents a 128-bit binary ID in the canonical ascii UUID format |
| vodml-id | caom2 | |
| description | this package contains the CAOM object types and enumerations | |
| parent | caom2 | |
| Object types | Algorithm Artifact CaomEntity Chunk CompositeObservation DataQuality Energy Environment Instrument Metrics Observation Part Plane Polarization Position Proposal Provenance Requirements SimpleObservation Target TargetPosition Telescope Time | |
| Enumerations | CalibrationLevel DataProductType EnergyBand ObservationIntentType PolarizationState ProductType Quality ReleaseType Status TargetType | |
| child package(s) | types wcs | |
| vodml-id | Algorithm | |||||||||||||||||||||
| description | TODO: describe this | |||||||||||||||||||||
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| vodml-id | Artifact | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | a physical product (typically a file) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | CalibrationLevel | ||
| description | the degree to which data has been calibrated to remove instrumental effects; issue: there is no way to convey the integer serialised values here | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| RAW_INSTRUMENTAL | vodml-id | CalibrationLevel.RAW_INSTRUMENTAL | |
| description | raw data in some opaque instrument-specific format | ||
| RAW_STANDARD | vodml-id | CalibrationLevel.RAW_STANDARD | |
| description | raw data in a common format | ||
| CALIBRATED | vodml-id | CalibrationLevel.CALIBRATED | |
| description | standard calibration steps have been applied | ||
| PRODUCT | vodml-id | CalibrationLevel.PRODUCT | |
| description | additional non-standard calibration steps have been applied | ||
| vodml-id | CaomEntity | |||||||||||||||||||||||||||||||||||||||||||
| description | base entity class to support persistence; entity attributes are generally set or updated by persistence implementations | |||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | Chunk | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | a quantitatively defined subsection of a data array; the part contains the whole array | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | CompositeObservation | |||||||||||||||||||||||||
| description | an observation made by combining other observations | |||||||||||||||||||||||||
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| vodml-id | DataProductType | ||
| description | a general description of the type or structure of the data; work-around: using the name of the literal to convey the serialised value | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| image | vodml-id | DataProductType.IMAGE | |
| description | TODO | ||
| spectrum | vodml-id | DataProductType.SPECTRUM | |
| description | TODO | ||
| timeseries | vodml-id | DataProductType.TIMESERIES | |
| description | TODO | ||
| visibility | vodml-id | DataProductType.VISIBILITY | |
| description | TODO | ||
| eventlist | vodml-id | DataProductType.EVENTLIST | |
| description | TODO | ||
| cube | vodml-id | DataProductType.CUBE | |
| description | TODO | ||
| catalog | vodml-id | DataProductType.CATALOG | |
| description | TODO | ||
| vodml-id | DataQuality | |||||||||||||||||||||
| description | description of the data quality | |||||||||||||||||||||
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| vodml-id | Energy | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | description of the energy coverage and sampling of the data | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | EnergyBand | ||
| description | a general set of energy regions that span the electromagnetic spectrum; work-around: using the name of the literal to convey the serialised value | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| Radio | vodml-id | EnergyBand.RADIO | |
| description | wavelength greater than ~10mm | ||
| Millimeter | vodml-id | EnergyBand.MILLIMETER | |
| description | wavelength from 0.1 to 10mm | ||
| Infrared | vodml-id | EnergyBand.INFRARED | |
| description | wavelength from 1um to 0.1mm | ||
| Optical | vodml-id | EnergyBand.OPTICAL | |
| description | wavelength from 300nm to 1um | ||
| UV | vodml-id | EnergyBand.UV | |
| description | wavelength from 100 to 300nm | ||
| EUV | vodml-id | EnergyBand.EUV | |
| description | wavelength from 10 to 100nm | ||
| Xray | vodml-id | EnergyBand.XRAY | |
| description | energy from 0.12 to 120keV | ||
| Gammaray | vodml-id | EnergyBand.GAMMARAY | |
| description | energy greater than ~120keV | ||
| vodml-id | Environment | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | collection of measured quantities that characterise the environment at the time of observation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | Instrument | ||||||||||||||||||||||||||||||
| description | description of the instrument used to acquire the data | ||||||||||||||||||||||||||||||
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| vodml-id | Metrics | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | collection of measured quantities that describe the content of the data | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | Observation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | an observation is a single top-level entry in an astronomy data centre | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | ObservationIntentType | ||
| description | the intent of the original observer in acquiring this observation; work-around: using the name of the literal to convey the serialised value | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| science | vodml-id | ObservationIntentType.SCIENCE | |
| description | the intent of this observation was to create science data | ||
| calibration | vodml-id | ObservationIntentType.CALIBRATION | |
| description | the intent of this observation was to create calibration data | ||
| vodml-id | Part | |||||||||||||||||||||||||||||||||||||||||||||||||||
| description | format-specific name of this part; this is typically something like a FITS extension or a file within a container | |||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | Plane | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | a component of an observation that describes one product of the observation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | Polarization | ||||||||||||||||||||||||||||||
| description | description of polarization measurements included in the data | ||||||||||||||||||||||||||||||
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| vodml-id | PolarizationState | ||
| description | a classification of polarization (Stokes states plus other related quantities); work-around: using the name of the literal to convey the serialised value | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| I | vodml-id | PolarizationState.I | |
| description | TODO | ||
| Q | vodml-id | PolarizationState.Q | |
| description | TODO | ||
| U | vodml-id | PolarizationState.U | |
| description | TODO | ||
| V | vodml-id | PolarizationState.V | |
| description | TODO | ||
| RR | vodml-id | PolarizationState.RR | |
| description | TODO | ||
| LL | vodml-id | PolarizationState.LL | |
| description | TODO | ||
| RL | vodml-id | PolarizationState.RL | |
| description | TODO | ||
| LR | vodml-id | PolarizationState.LR | |
| description | TODO | ||
| XX | vodml-id | PolarizationState.XX | |
| description | TODO | ||
| YY | vodml-id | PolarizationState.YY | |
| description | TODO | ||
| XY | vodml-id | PolarizationState.XY | |
| description | TODO | ||
| YX | vodml-id | PolarizationState.YX | |
| description | TODO | ||
| POLI | vodml-id | PolarizationState.POLI | |
| description | TODO | ||
| FPOLI | vodml-id | PolarizationState.FPOLI | |
| description | TODO | ||
| POLA | vodml-id | PolarizationState.POLA | |
| description | TODO | ||
| EPOLI | vodml-id | PolarizationState.EPOLI | |
| description | TODO | ||
| CPOLI | vodml-id | PolarizationState.CPOLI | |
| description | TODO | ||
| NPOLI | vodml-id | PolarizationState.NPOLI | |
| description | TODO | ||
| vodml-id | Position | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | description of the position coverage and sampling of the data | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | ProductType | ||
| description | a general classification of the content of data files or parts thereof; work-around: using the name of the literal to convey the serialised value | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| science | vodml-id | ProductType.SCIENCE | |
| description | this is the science data; data values come from extraterrestrial photons | ||
| calibration | vodml-id | ProductType.CALIBRATION | |
| description | this is calibration data; | ||
| info | vodml-id | ProductType.INFO | |
| description | the content provides additional information: explanations, logs, etc | ||
| preview | vodml-id | ProductType.PREVIEW | |
| description | this is non-science preview data | ||
| thumbnail | vodml-id | ProductType.THUMBNAIL | |
| description | this is a small non-science preview data; small means that this preview is suitable to display in a popup window or with multiple displayed together | ||
| noise | vodml-id | ProductType.NOISE | |
| description | this is auxiliary data with some measure of the noise; to be used when analysing the science data | ||
| weight | vodml-id | ProductType.WEIGHT | |
| description | this is auxiliary data which provides weight values; to be used when analysing the science data | ||
| auxiliary | vodml-id | ProductType.AUXILIARY | |
| description | this is auxiliary data; to be used when analysing the science data | ||
| vodml-id | Proposal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | description of the science proposal or programme that initiated the observation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | Provenance | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | description of how this data was produced | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | Quality | ||
| description | a general indicator of data quality; work-around: using the name of the literal to convey the serialised value | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| junk | vodml-id | Quality.JUNK | |
| description | this data cannot be used for anything | ||
| vodml-id | ReleaseType | ||
| description | a flag indicating how an artifact is classified to determine access permissions; work-around: using the name of the literal to convey the serialised value | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| data | vodml-id | ReleaseType.DATA | |
| description | access permission checks assume the protected item is data | ||
| meta | vodml-id | ReleaseType.META | |
| description | access permission checks assume the protected item is metadata | ||
| vodml-id | Requirements | |||||||||||||||||||||
| description | description of the observational requirements specified by the proposal | |||||||||||||||||||||
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| vodml-id | SimpleObservation | ||||||||||
| description | an observation created directly by operating an instrument or process | ||||||||||
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| vodml-id | Status | ||
| description | a status flag indicating degree of success; work-around: using the name of the literal to convey the serialised value | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| fail | vodml-id | Status.FAIL | |
| description | TBD | ||
| vodml-id | Target | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | description of the target of an observation | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | TargetPosition | |||||||||||||||||||||||||||||||||||||||
| description | description of the intended position of the observation (not the position of the intended or actual target) | |||||||||||||||||||||||||||||||||||||||
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| vodml-id | TargetType | ||
| description | the type of target being observed; qualifies target name; work-around: using the name of the literal to convey the serialised value | ||
| package | caom2 | ||
| literals | |||
| name | feature | value | |
| object | vodml-id | TargetType.OBJECT | |
| description | the target of the observation is an astronomical object | ||
| field | vodml-id | TargetType.FIELD | |
| description | the target of the observation is a defined region on the sky | ||
| vodml-id | Telescope | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | description of the telescope where an observation was created | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | Time | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | description of the time coverage and sampling of the data | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | types | |
| description | data types | |
| parent | caom2 | |
| Data types | Circle Interval Point Polygon Shape SubInterval | |
| Parent package | caom2 | |
| vodml-id | Circle | |||||||||||||||||||||||||
| description | [TODO add description!] | |||||||||||||||||||||||||
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| vodml-id | Interval | ||||||||||||||||||||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | Point | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | Polygon | |||||||||||||||||||||||||
| description | [TODO add description!] | |||||||||||||||||||||||||
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| vodml-id | Shape | |||||||||||||||||||||||||||||||||||||||||||
| description | [TODO add description!] | |||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | SubInterval | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | wcs | |
| description | World Coordinate System (WCS) data types | |
| parent | caom2 | |
| Object types | ObservableAxis PolarizationWCS SpatialWCS SpectralWCS TemporalWCS | |
| Data types | Axis Coord2D CoordAxis1D CoordAxis2D CoordBounds1D CoordBounds2D CoordError CoordFunction1D CoordFunction2D CoordRange1D CoordRange2D Dimension2D EnergyTransition RefCoord Slice | |
| Parent package | caom2 | |
| vodml-id | Axis | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | Coord2D | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | CoordAxis1D | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | [TODO add description!] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | CoordAxis2D | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | [TODO add description!] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | CoordBounds1D | |||||||||||||||||||||
| description | [TODO add description!] | |||||||||||||||||||||
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| vodml-id | CoordBounds2D | |||||||||||||||||||||
| description | [TODO add description!] | |||||||||||||||||||||
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| vodml-id | CoordError | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | CoordFunction1D | |||||||||||||||||||||||||||||||||||||||
| description | [TODO add description!] | |||||||||||||||||||||||||||||||||||||||
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| vodml-id | CoordFunction2D | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | CoordRange1D | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | CoordRange2D | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | Dimension2D | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | EnergyTransition | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | ObservableAxis | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | PolarizationWCS | |||||||||||||||||||||
| description | [TODO add description!] | |||||||||||||||||||||
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| vodml-id | RefCoord | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | Slice | ||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||
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| vodml-id | SpatialWCS | ||||||||||||||||||||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | SpectralWCS | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | TemporalWCS | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| description | [TODO add description!] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| vodml-id | feature type | description |
| vo-dml:model | a general purpose data model for use as the core data model of an astronomical data centre | |
| uuid | primitiveType | represents a 128-bit binary ID in the canonical ascii UUID format |
| caom2 | package | this package contains the CAOM object types and enumerations |
| Algorithm | objectType | TODO: describe this |
| Algorithm.name | attribute | |
| Artifact | objectType | a physical product (typically a file) |
| Artifact.contentLength | attribute | the size of the resolved artifact; typically file size in bytes) |
| Artifact.contentType | attribute | label specifying the format of the resolved artifact; typically a MIME-type |
| Artifact.parts | composition | the component parts of this artifact |
| Artifact.productType | attribute | TODO: define this |
| Artifact.releaseType | attribute | field indicating how access permissions for this artifact are determined |
| Artifact.uri | attribute | an identifier that resolves to the storage location of the artifact |
| CalibrationLevel | enumeration | the degree to which data has been calibrated to remove instrumental effects; issue: there is no way to convey the integer serialised values here |
| CalibrationLevel.CALIBRATED | literal | standard calibration steps have been applied |
| CalibrationLevel.PRODUCT | literal | additional non-standard calibration steps have been applied |
| CalibrationLevel.RAW_INSTRUMENTAL | literal | raw data in some opaque instrument-specific format |
| CalibrationLevel.RAW_STANDARD | literal | raw data in a common format |
| CaomEntity | objectType | base entity class to support persistence; entity attributes are generally set or updated by persistence implementations |
| CaomEntity.id | attribute | globally unique identifier (primary key) |
| CaomEntity.lastModified | attribute | timestamp of last modification of this entity |
| CaomEntity.maxLastModified | attribute | maximum timestamp of last modification of this entity and all child entities |
| Chunk | objectType | a quantitatively defined subsection of a data array; the part contains the whole array |
| Chunk.energy | composition | spectral WCS description of the data array or subsection thereof |
| Chunk.energyAxis | attribute | index of the energy axis |
| Chunk.naxis | attribute | number of axes in the data array |
| Chunk.observable | composition | observable description of the data array or subsection thereof |
| Chunk.observableAxis | attribute | index of the observable axis |
| Chunk.poslarization | composition | polarization WCS description of the data array or subsection thereof |
| Chunk.polarizationAxis | attribute | index of the polarization axis |
| Chunk.position | composition | spatial WCS description of the data array or subsection thereof |
| Chunk.positionAxis1 | attribute | index of the first position axis |
| Chunk.positionAxis2 | attribute | index of the second position axis |
| Chunk.productType | attribute | product type where it differs from the parent part |
| Chunk.time | composition | temporal WCS description of the data array or subsection thereof |
| Chunk.timeAxis | attribute | index of the time axis |
| CompositeObservation | objectType | an observation made by combining other observations |
| CompositeObservation.members | attribute | members are the observations grouped together by the algorithm that defines the composite |
| DataProductType | enumeration | a general description of the type or structure of the data; work-around: using the name of the literal to convey the serialised value |
| DataProductType.CATALOG | literal | TODO |
| DataProductType.CUBE | literal | TODO |
| DataProductType.EVENTLIST | literal | TODO |
| DataProductType.IMAGE | literal | TODO |
| DataProductType.SPECTRUM | literal | TODO |
| DataProductType.TIMESERIES | literal | TODO |
| DataProductType.VISIBILITY | literal | TODO |
| DataQuality | objectType | description of the data quality |
| DataQuality.flag | attribute | flag indicating the data quality |
| Energy | objectType | description of the energy coverage and sampling of the data |
| Energy.bandpassName | attribute | telescope- and instrument-specific name for the energy band included |
| Energy.bounds | attribute | energy bounds that include the data |
| Energy.dimension | attribute | number of measurements (pixels) on the energy axis |
| Energy.emBand | attribute | standard name of the energy regime included in the data |
| Energy.freqSampleSize | attribute | median pixekl size expressed in frequency |
| Energy.freqWidth | attribute | width of the bounding interval expressed in frequency |
| Energy.resolvingPower | attribute | median spectral resolving power per pixel |
| Energy.restwav | attribute | rest wavelength of the target energy transition |
| Energy.sampleSize | attribute | median pixel size |
| Energy.transition | attribute | target energy transition for this data |
| EnergyBand | enumeration | a general set of energy regions that span the electromagnetic spectrum; work-around: using the name of the literal to convey the serialised value |
| EnergyBand.EUV | literal | wavelength from 10 to 100nm |
| EnergyBand.GAMMARAY | literal | energy greater than ~120keV |
| EnergyBand.INFRARED | literal | wavelength from 1um to 0.1mm |
| EnergyBand.MILLIMETER | literal | wavelength from 0.1 to 10mm |
| EnergyBand.OPTICAL | literal | wavelength from 300nm to 1um |
| EnergyBand.RADIO | literal | wavelength greater than ~10mm |
| EnergyBand.UV | literal | wavelength from 100 to 300nm |
| EnergyBand.XRAY | literal | energy from 0.12 to 120keV |
| Environment | objectType | collection of measured quantities that characterise the environment at the time of observation |
| Environment.ambientTemp | attribute | ambient temperature (outside or inside the telescope?) |
| Environment.elevation | attribute | angular elevation (alt in alt-azimuth?) above horizon |
| Environment.humidity | attribute | humidity [0,1] |
| Environment.seeing | attribute | typical atmospheric distortion (full-width-half-max of point source) |
| Environment.photometric | attribute | indicator that flux and/or color calibration is stable/feasible? |
| Environment.tau | attribute | TODO |
| Environment.wavelengthTau | attribute | TODO |
| Instrument | objectType | description of the instrument used to acquire the data |
| Instrument.keywords | attribute | additional keywords that describe the instrument or instrument configuration at the time of observation |
| Instrument.name | attribute | common name for the instrument |
| Metrics | objectType | collection of measured quantities that describe the content of the data |
| Metrics.background | attribute | background level |
| Metrics.backgroundStddev | attribute | standard deviation in the background level |
| Metrics.fluxDensityLimit | attribute | flux density with a signal:noise ratio of 10 |
| Metrics.magLimit | attribute | magnitude with a signal:noise ratio of 10 |
| Metrics.sourceNumberDensity | attribute | number of sources detected per unit area |
| Observation | objectType | an observation is a single top-level entry in an astronomy data centre |
| Observation.algorithm | composition | the algorithm or process that created this observation |
| Observation.collection | attribute | the name of the data collection this observation belongs to |
| Observation.environment | composition | the environmental conditions at the time of observation |
| Observation.instrument | composition | the instrument or detector used to acquire the data |
| Observation.intent | attribute | the intent of the original observer in acquiring this data |
| Observation.metaRelease | attribute | timestamp after which metadata for the observation instance is public |
| Observation.observationID | attribute | the collection-specific identifier for this observation |
| Observation.planes | composition | the component planes belonging to this observation |
| Observation.Proposal | composition | the science proposal underwhich this observation was created |
| Observation.requirements | composition | the observational requirements specified by the observer or proposal |
| Observation.sequenceNumber | attribute | a collection-specific sequence number for observations; re-use or reset is collection specific |
| Observation.target | composition | the intended target of the observation |
| Observation.targetPosition | composition | the intended target position for this observation |
| Observation.telescope | composition | the telescope or facility where this observation was created |
| Observation.type | attribute | TODO: define this |
| ObservationIntentType | enumeration | the intent of the original observer in acquiring this observation; work-around: using the name of the literal to convey the serialised value |
| ObservationIntentType.CALIBRATION | literal | the intent of this observation was to create calibration data |
| ObservationIntentType.SCIENCE | literal | the intent of this observation was to create science data |
| Part | objectType | format-specific name of this part; this is typically something like a FITS extension or a file within a container |
| Part.chunks | composition | component chunks that belong to this part |
| Part.name | attribute | the name of this part of the artifact; this is typically something like a FITS extension name or number or a filename |
| Part.productType | attribute | product type of this part when it differs from the parent artifact |
| Plane | objectType | a component of an observation that describes one product of the observation |
| Plane.artifacts | composition | the component artifacts belonging to this plane |
| Plane.calibrationLevel | attribute | standard classification of the degree to which the data is calibrated |
| Plane.dataProductType | attribute | standard classification of the type of data product; describes the logical data type for the main artifacts |
| Plane.dataRelease | attribute | timestamp after which data for the plane is public; this dataRelease timestamp applies to all children of the plane and to artifacts with releaseType=data |
| Plane.energy | composition | descritpion of the energy(ies) included in the data |
| Plane.metaRelease | attribute | timestamp after which metadata for the plane is public; this metaRelease timestamp applies to all children of the plane and to artifacts with releaseType=meta |
| Plane.metrics | composition | collection of measured quantities that describe the content of the data |
| Plane.polarization | composition | description of the polarization(s) included in the data |
| Plane.position | composition | description of the position(s) included in the data |
| Plane.productID | attribute | collection- and observationID-specific identifier for this product |
| Plane.provenance | composition | description of the provenance of the data |
| Plane.quality | composition | flag indicating the quality of the data |
| Plane.time | composition | description of the time(s) included in the data |
| Polarization | objectType | description of polarization measurements included in the data |
| Polarization.dimension | attribute | number of polarization states included |
| Polarization.states | attribute | standard polarization states included |
| PolarizationState | enumeration | a classification of polarization (Stokes states plus other related quantities); work-around: using the name of the literal to convey the serialised value |
| PolarizationState.CPOLI | literal | TODO |
| PolarizationState.EPOLI | literal | TODO |
| PolarizationState.FPOLI | literal | TODO |
| PolarizationState.I | literal | TODO |
| PolarizationState.LL | literal | TODO |
| PolarizationState.LR | literal | TODO |
| PolarizationState.NPOLI | literal | TODO |
| PolarizationState.POLA | literal | TODO |
| PolarizationState.POLI | literal | TODO |
| PolarizationState.Q | literal | TODO |
| PolarizationState.RL | literal | TODO |
| PolarizationState.RR | literal | TODO |
| PolarizationState.U | literal | TODO |
| PolarizationState.V | literal | TODO |
| PolarizationState.XX | literal | TODO |
| PolarizationState.XY | literal | TODO |
| PolarizationState.YX | literal | TODO |
| PolarizationState.YY | literal | TODO |
| Position | objectType | description of the position coverage and sampling of the data |
| Position.bounds | attribute | spatial boundary that includes the data |
| Position.dimension | attribute | number of separate measurements (pixels) along each axis |
| Position.resolution | attribute | median spatial resolution (full-width-half-max) per pixel |
| Position.sampleSize | attribute | median pixel size |
| Position.timeDependent | attribute | indicates that the observation was taken with non-siderial tracking so the resulting position is time-dependent; this usually explains why no bounds is available |
| ProductType | enumeration | a general classification of the content of data files or parts thereof; work-around: using the name of the literal to convey the serialised value |
| ProductType.AUXILIARY | literal | this is auxiliary data; to be used when analysing the science data |
| ProductType.CALIBRATION | literal | this is calibration data; |
| ProductType.INFO | literal | the content provides additional information: explanations, logs, etc |
| ProductType.NOISE | literal | this is auxiliary data with some measure of the noise; to be used when analysing the science data |
| ProductType.PREVIEW | literal | this is non-science preview data |
| ProductType.SCIENCE | literal | this is the science data; data values come from extraterrestrial photons |
| ProductType.THUMBNAIL | literal | this is a small non-science preview data; small means that this preview is suitable to display in a popup window or with multiple displayed together |
| ProductType.WEIGHT | literal | this is auxiliary data which provides weight values; to be used when analysing the science data |
| Proposal | objectType | description of the science proposal or programme that initiated the observation |
| Proposal.keywords | attribute | additional keywords that describe the science goals of the proposal |
| Proposal.pi | attribute | proper name of the principal investigator |
| Proposal.project | attribute | common name of the project this proposal belongs to; typically used for larger or long-running projects that include mutliple proposals |
| Proposal.proposalID | attribute | collection-specific identifier for the proposal |
| Proposal.title | attribute | title of the proposal |
| Provenance | objectType | description of how this data was produced |
| Provenance.inputs | attribute | version of the software or process that produced the data |
| Provenance.keywords | attribute | addituional keywords that describe the processing; this may include both general descriptive words and those specific to this particular execution of the processing |
| Provenance.lastExecuted | attribute | timestamp describing when this process last ran and produced data |
| Provenance.name | attribute | collection-specific common name of the process |
| Provenance.producer | attribute | common name of the entity (person, institute, etc) responsible for producing the data |
| Provenance.project | attribute | name of the project that produced the data; data produced in a uniform way are typically labelled with the same project name |
| Provenance.reference | attribute | collection-specific common name of the process |
| Provenance.runID | attribute | collection-specific identifier for the processing instance that produced the data; this identifier can typcially be traced in log files or logging systems |
| Provenance.version | attribute | version of the software or process that produced the data |
| Quality | enumeration | a general indicator of data quality; work-around: using the name of the literal to convey the serialised value |
| Quality.JUNK | literal | this data cannot be used for anything |
| ReleaseType | enumeration | a flag indicating how an artifact is classified to determine access permissions; work-around: using the name of the literal to convey the serialised value |
| ReleaseType.DATA | literal | access permission checks assume the protected item is data |
| ReleaseType.META | literal | access permission checks assume the protected item is metadata |
| Requirements | objectType | description of the observational requirements specified by the proposal |
| Requirements.flag | attribute | flag indicating degree to which requirements were satisfied |
| SimpleObservation | objectType | an observation created directly by operating an instrument or process |
| Status | enumeration | a status flag indicating degree of success; work-around: using the name of the literal to convey the serialised value |
| Status.FAIL | literal | |
| Target | objectType | description of the target of an observation |
| Target.keywords | attribute | additional keywords that describe the target |
| Target.moving | attribute | indicates that the target is a moving object; used for solar system objects but not high proper motion stars |
| Target.name | attribute | proper name of the target |
| Target.redshift | attribute | cosmological redshift of the target |
| Target.standard | attribute | indicates that the target is typically used as a standard (astrometric, photometric, etc) |
| Target.type | attribute | type of target; typically used to figure out what the target name means and where to look for additional information about it |
| TargetPosition | objectType | description of the intended position of the observation (not the position of the intended or actual target) |
| TargetPosition.coordinates | attribute | the coordinates |
| TargetPosition.coordsys | attribute | the coordinate system of the coordinates |
| TargetPosition.equinox | attribute | the equinox of the coordinates |
| TargetType | enumeration | the type of target being observed; qualifies target name; work-around: using the name of the literal to convey the serialised value |
| TargetType.FIELD | literal | the target of the observation is a defined region on the sky |
| TargetType.OBJECT | literal | the target of the observation is an astronomical object |
| Telescope | objectType | description of the telescope where an observation was created |
| Telescope.geoLocationX | attribute | x-coordinate of the geocentric location of the telescope at the time of observation (see FITS WCS Paper III) |
| Telescope.geoLocationY | attribute | y-coordinate of the geocentric location of the telescope at the time of observation (see FITS WCS Paper III) |
| Telescope.geoLocationZ | attribute | z-coordinate of the geocentric location of the telescope at the time of observation (see FITS WCS Paper III) |
| Telescope.keywords | attribute | additional keywords that describe the telescope or telscope configuration at the time of observation |
| Telescope.name | attribute | common name of the telescope |
| Time | objectType | description of the time coverage and sampling of the data |
| Time.bounds | attribute | time bounds that include the data |
| Time.dimension | attribute | number of measurements (pixels) on the time axis |
| Time.exposure | attribute | median exposure time per pixel |
| Time.resolution | attribute | median temporal resolution per pixel |
| Time.sampleSize | attribute | median pixel size |
| types | package | data types |
| Circle | dataType | |
| Circle.radius | attribute | |
| Interval | dataType | |
| Interval.lower | attribute | |
| Interval.samples | attribute | |
| Interval.upper | attribute | |
| Interval.width | attribute | |
| Point | dataType | |
| Point.cval1 | attribute | |
| Point.cval2 | attribute | |
| Polygon | dataType | |
| Polygon.vertices | attribute | |
| Shape | dataType | |
| Shape.area | attribute | |
| Shape.center | attribute | |
| Shape.size | attribute | |
| SubInterval | dataType | |
| SubInterval.lower | attribute | |
| SubInterval.upper | attribute | |
| wcs | package | World Coordinate System (WCS) data types |
| Axis | dataType | |
| Axis.ctype | attribute | |
| Axis.cunit | attribute | |
| Coord2D | dataType | |
| Coord2D.coord1 | attribute | |
| Coord2D.coord2 | attribute | |
| CoordAxis1D | dataType | |
| CoordAxis1D.axis | attribute | |
| CoordAxis1D.bounds | attribute | |
| CoordAxis2D.error | attribute | |
| CoordAxis1D.function | attribute | |
| CoordAxis1D.range | attribute | |
| CoordAxis2D | dataType | |
| CoordAxis2D.axis1 | attribute | |
| CoordAxis2D.axis2 | attribute | |
| CoordAxis2D.bounds | attribute | |
| CoordAxis2D.error1 | attribute | |
| CoordAxis2D.error2 | attribute | |
| CoordAxis2D.function | attribute | |
| CoordAxis2D.range | attribute | |
| CoordBounds1D | dataType | |
| CoordBounds1D.samples | attribute | |
| CoordBounds2D | dataType | |
| CoordBounds2D.vertices | attribute | |
| CoordError | dataType | |
| CoordError.crder | attribute | |
| CoordError.csyer | attribute | |
| CoordFunction1D | dataType | |
| CoordFunction1D.delta | attribute | |
| CoordFunction1D.dimension | attribute | |
| CoordFunction1D.refCoord | attribute | |
| CoordFunction2D | dataType | |
| CoordFunction2D.cd11 | attribute | |
| CoordFunction2D.cd12 | attribute | |
| CoordFunction2D.cd21 | attribute | |
| CoordFunction2D.cd22 | attribute | |
| CoordFunction2D.dimension | attribute | |
| CoordFunction2D.refCoord | attribute | |
| CoordRange1D | dataType | |
| CoordRange1D.end | attribute | |
| CoordRange1D.start | attribute | |
| CoordRange2D | dataType | |
| CoordRange2D.end | attribute | |
| CoordRange2D.start | attribute | |
| Dimension2D | dataType | |
| Dimension2D.naxis1 | attribute | |
| Dimension2D.naxis2 | attribute | |
| EnergyTransition | dataType | |
| EnergyTransition.species | attribute | |
| EnergyTransition.transition | attribute | |
| ObservableAxis | objectType | |
| ObservableAxis.dependent | attribute | |
| ObservableAxis.independent | attribute | |
| PolarizationWCS | objectType | |
| PolarizationWCS.axis | attribute | |
| RefCoord | dataType | |
| RefCoord.pix | attribute | |
| RefCoord.val | attribute | |
| Slice | dataType | |
| Slice.axis | attribute | |
| Slice.bin | attribute | |
| SpatialWCS | objectType | |
| SpatialWCS.axis | attribute | |
| SpatialWCS.coordsys | attribute | |
| SpatialWCS.equinox | attribute | |
| SpatialWCS.resolution | attribute | |
| SpectralWCS | objectType | |
| SpectralWCS.axis | attribute | |
| SpectralWCS.bandpassName | attribute | |
| SpectralWCS.resolvingPower | attribute | |
| SpectralWCS.restfrq | attribute | |
| SpectralWCS.restwav | attribute | |
| SpectralWCS.specsys | attribute | |
| SpectralWCS.ssysobs | attribute | |
| SpectralWCS.ssyssrc | attribute | |
| SpectralWCS.transition | attribute | |
| SpectralWCS.velang | attribute | |
| SpectralWCS.velosys | attribute | |
| SpectralWCS.zsource | attribute | |
| TemporalWCS | objectType | |
| TemporalWCS.axis | attribute | |
| TemporalWCS.exposure | attribute | |
| TemporalWCS.mjdref | attribute | |
| TemporalWCS.resolution | attribute | |
| TemporalWCS.timesys | attribute | |
| TemporalWCS.trefpos | attribute |
This section lists the external models imported by the current data model. For each imported model we list URLs to the VO-DML and HTML representations and the prefix used for vodml-ids from inside the model.
| Model vodml-id | ivoa |
| url | https://volute.g-vo.org/svn/trunk/projects/dm/vo-dml/models/ivoa/IVOA.vo-dml.xml |
| documentation url | https://volute.g-vo.org/svn/trunk/projects/dm/vo-dml/models/ivoa/IVOA.html |