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Element Description
The science keyword elements enable the specification of Earth science keywords related to the data set. The science keywords are chosen from a controlled keyword hierarchy maintained in the Keyword Management System (KMS). A list of valid science keywords can be found here: https://gcmdservices.gsfc.nasa.gov/static/kms/sciencekeywords/sciencekeywords.csv?
Best Practices
Science keywords are important for the precise search and retrieval of data, and should accurately represent the data set being described. As a rule of thumb, science keywords should represent the scientific parameters being provided in the data as well as any broader conceptual terms that may aid in describing the data. At a minimum, one science keyword hierarchy must be provided, and this hierarchy must go down to the 'Term' level of detail. The 'Detailed Variable' element is the only science keyword element that is not controlled by the KMS. The 'Detailed Variable' keyword should only be used if there is a very specific parameter provided in the data which is not adequately described by keywords in the KMS. If a particular science 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.
All positions in the science keyword hierarchy must be populated until the desired level of detail is reached. Skipping or leaving blank a position in the keyword hierarchy will render the keyword invalid. The only exception to this is the 'Detailed Variable' element; a Detailed Variable keyword may be provided as long as it is preceded by the required Category, Topic and Term keywords. Science keywords are not case sensitive.
Examples:
ScienceKeywords/Category: "EARTH SCIENCE"
ScienceKeywords/Topic: "ATMOSPHERE"
ScienceKeywords/Term: "CLOUDS"
ScienceKeywords/VariableLevel1: "TROPOSPHERIC/LOW LEVEL CLOUDS (OBSERVED/ANALYZED)"
ScienceKeywords/VariableLevel2: "STRATOCUMULUS"
ScienceKeywords/VariableLevel3: "STRATOCUMULUS CUMILIFORMIS"
ScienceKeywords/DetailedVariable: "STRATOCUMULUS VESPERALIS"
ScienceKeywords/Category: "EARTH SCIENCE"
ScienceKeywords/Topic: "BIOSPHERE"
ScienceKeywords/Term: "ECOLOGICAL DYNAMICS"
ScienceKeywords/VariableLevel1: "FIRE ECOLOGY"
ScienceKeywords/VariableLevel2: "FIRE MODELS"
Element Specification
An unlimited amount of science keywords may be listed (Cardinality: 1..*)
Model | Element | Type | Constraints | Required? | Cardinality |
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UMM-C | ScienceKeywords/Category | String | KMS controlled | Yes | 1 |
UMM-C | ScienceKeywords/Topic | String | KMS controlled | Yes | 1 |
UMM-C | ScienceKeywords/Term | String | KMS controlled | Yes | 1 |
UMM-C | ScienceKeywords/VariableLevel1 | String | KMS controlled | No | 0..1 |
UMM-C | ScienceKeywords/VariableLevel2 | String | KMS controlled | No | 0..1 |
UMM-C | ScienceKeywords/VariableLevel3 | String | KMS controlled | No | 0..1 |
UMM-C | ScienceKeywords/DetailedVariable | String | 1 - 80 characters (Uncontrolled/Free-Text) | No | 0..1 |
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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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 10 An unlimited amount of science keywords may be listed (Cardinality: 1..*)
Example Mapping
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ECHO 10 An unlimited amount of science keywords may be listed (Cardinality: 1..*)
Example Mapping
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ISO 19115-2 MENDS An unlimited amount of science keywords may be listed (Cardinality: 1..*)
Example Mapping
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ISO 19115-2 SMAP An unlimited amount of science keywords may be listed (Cardinality: 1..*)
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UMM Migration
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Future Mappings
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ISO 19115-1
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History
UMM Versioning
Version | Date | What Changed |
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1.0.0 | Initial Release |
ARC Documentation
Version | Date | What Changed | Author |
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1.0 | 5/4/18 | Recommendations/priority matrix transferred from internal ARC documentation to wiki space | Jeanne' le Roux |