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Element Description
The archive and distribution information main element allows data providers to provide users information of what is available for downloading when they initially looking at a collection. The end users get information such as the average downloadable file size, format, mime type, checksum, etc., an estimate of the collections entire downloadable file size, etc.
Best Practices
Instrument keywords are important for the discovery of data. All relevant instruments should be listed for each dataset, and each instrument listed should be provided under its associated platform. It is preferred that more specific instrument keyword terms be chosen from the KMS when available. For example, if data were collected from the AMSR-E instrument, it is preferred that "AMSR-E" be listed as the instrument as opposed to the more generic "RADIOMETERS" keyword. If a particular instrument keyword is missing from the KMS, it is possible to put in a request to have it added. The KMS is managed by the Global Change Master Directory (GCMD) and new keyword requests may be made through the GCMD Keywords Community Forum.
The Instruments/Technique field is optional. It can be used to further describe the technique utilized by the instrument for data collection. For example, the technique for a laser altimeter instrument on board a satellite could read "Measures the distance of the satellite from the Earth's surface by taking a precise measurement of the time it takes a transmitted laser pulse to hit the ground and then return to the instrument."
The Instruments/NumberOfInstruments field is optional. It can be used to indicate the number of instruments (i.e. sensors) used on the instrument while acquiring data. For example, the Terra satellite carries the ASTER instrument. The ASTER instrument is made up of 3 instrument subsystems (VNIR, SWIR, and TIR). In this example, the Instruments/NumberOfInstruments field would read "3".
The Instruments/OperationalModes field is optional and may be repeated. This field can be used to specify the mode(s) in which an instrument collects data. For example, the Sentinel-1 satellite collects data in four different modes. If a collection were to contain data acquired in all four modes, the OperationalModes field could be repeated four times and read "Stripmap (SM)", "Interferomic Wide swath (IW)", "Extra-Wide swath (EW)", "Wave (WV)"
Examples (ShortName > LongName):
SMMR > Scanning Multichannel Microwave Radiometer
OLI > Operational Land Imager
UAVSAR > Uninhabited Aerial Vehicle Synthetic Aperture Radar
LIS > Lightning Imaging Sensor
XPOL > NOAA/ETL X-band Polarimetric Doppler Radar
Element Specification
Instrument is an optional metadata element, however, it is strongly recommended that it be provided when possible. Multiple Instruments may be listed if necessary (Cardinality: 0..*).
Providing instrument characteristics is optional. An unlimited amount of instrument characteristics may be specified for a particular instrument (Cardinality: 0..*). If instrument characteristics are provided, all 5 sub-fields (Name, Description, DataType, Unit, Value) are required.
Model | Element | Type | Usable Valid Values | Constraints | Required? | Cardinality | Notes |
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UMM-Common | Platforms/Instruments/ShortName | String | Instrument Short_Name Keywords | KMS controlled | Yes, if applicable | 1 | |
UMM-Common | Platforms/Instruments/LongName | String | Instrument Long_Name Keywords | KMS controlled | No | 0..1 | |
UMM-Common | Platforms/Instruments/Technique | String | n/a | 1 - 2048 characters | No | 0..1 | |
UMM-Common | Platforms/Instruments/NumberOfInstruments | Integer | n/a | n/a | No | 0..1 | |
UMM-Common | Platforms/Instruments/Characteristics/Name | String | n/a | 1 - 80 characters | Yes, if applicable | 1 | Only required if a characteristic is listed. Providing characteristics is optional. |
UMM-Common | Platforms/Instruments/Characteristics/Description | String | n/a | 1 - 80 characters | Yes, if applicable | 1 | Only required if a characteristic is listed. Providing characteristics is optional. |
UMM-Common | Platforms/Instruments/Characteristics/DataType | Enumeration | STRING FLOAT INT BOOLEAN DATE TIME DATETIME DATE_STRING TIME_STRING DATETIME_STRING | n/a | Yes, if applicable | 1 | Only required if a characteristic is listed. Providing characteristics is optional. |
UMM-Common | Platforms/Instruments/Characteristics/Unit | String | n/a | 1 - 20 characters | Yes, if applicable | 1 | Only required if a characteristic is listed. Providing characteristics is optional. |
UMM-Common | Platforms/Instruments/Characteristics/Value | String | n/a | 1 - 80 characters | Yes, if applicable | 1 | Only required if a characteristic is listed. Providing characteristics is optional. |
UMM-Common | Platforms/Instruments/OperationalModes | String | n/a | 1 - 20 characters | No | 0..* |
Value needed for translations:
The following value is needed by the CMR to translate older non UMM compliant records to and from the UMM and other supported specifications where non required elements are considered required but no valid is given. This is needed partly because the CMR still allows a non UMM compliant record to be ingested with warnings.
UNDEFINED - DIF 10 records found to be missing instruments by software will be automatically assigned a value of "Not Provided". It should then be confirmed whether an instrument can be assigned or whether "Not Applicable" should be provided. The value "Not Provided" should not be used by metadata providers.
Metadata Validation and QA/QC
All metadata entering the CMR goes through the below process to ensure metadata quality requirements are met. All records undergo CMR validation before entering the system. The process of QA/QC is slightly different for NASA and non-NASA data providers. Non-NASA providers include interagency and international data providers and are referred to as the International Directory Network (IDN).
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ARC Automated Checks
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Dialect Mappings
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DIF 9 (Note: DIF-9 is being phased out and will no longer be supported after 2018) |
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DIF 10Instrument is a required metadata element. At least 1 Instrument Keyword must be provided under each Platform. Multiple Instruments may be listed if necessary (Cardinality: 1..*). Providing instrument characteristics is optional. An unlimited amount of instrument characteristics may be specified for a particular instrument (Cardinality: 0..*). If instrument characteristics are provided, all 5 sub-fields (Name, Description, DataType, Unit, Value) are required.
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ECHO 10Instrument is an optional metadata element, however, it is strongly recommended that it be provided when possible. Multiple Instruments may be listed if necessary (Cardinality: 0..*). Providing instrument characteristics is optional. An unlimited amount of instrument characteristics may be specified for a particular instrument (Cardinality: 0..*). If instrument characteristics are provided, all 5 sub-fields (Name, Description, DataType, Unit, Value) are required.
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ISO 19115-2 MENDSInstrument is an optional metadata element, however, it is strongly recommended that it be provided when possible. Multiple Instruments may be listed if necessary (Cardinality: 0..*). Providing instrument characteristics is optional. An unlimited amount of instrument characteristics may be specified for a particular instrument (Cardinality: 0..*). If instrument characteristics are provided, all 5 sub-fields (Name, Description, DataType, Unit, Value) are required.
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ISO 19115-2 SMAPInstrument is an optional metadata element, however, it is strongly recommended that it be provided when possible. Multiple Instruments may be listed if necessary (Cardinality: 0..*). Providing instrument characteristics is optional. An unlimited amount of instrument characteristics may be specified for a particular instrument (Cardinality: 0..*). If instrument characteristics are provided, all 5 sub-fields (Name, Description, DataType, Unit, Value) are required.
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UMM Migration
None
Future Mappings
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ISO 19115-1Instrument is an optional metadata element, however, it is strongly recommended that it be provided when possible. Multiple Instruments may be listed if necessary (Cardinality: 0..*). Providing instrument characteristics is optional. An unlimited amount of instrument characteristics may be specified for a particular instrument (Cardinality: 0..*). If instrument characteristics are provided, all 5 sub-fields (Name, Description, DataType, Unit, Value) are required.
Example Mapping
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History
UMM Versioning
Version | Date | What Changed |
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1.13.0 | Future | This element was added to the UMM-C specification. |
ARC Documentation
Version | Date | What Changed | Author |
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1.0 | 5/16/18 | Recommendations/priority matrix transferred from internal ARC documentation to wiki space |