Element Description
The Science Keywords element allows relevant Earth science keywords to be associated with a dataset to better enable data search and discovery. 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/kms/concepts/concept_scheme/sciencekeywords?format=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
One Science Keyword is required and more Science Keywords may be provided (Cardinality: 1..*). For every science keyword that is provided the sub elements of Category, Topic, and Term are required.
Model | Element | Type | Usable Valid Values | Constraints | Required? | Cardinality |
---|---|---|---|---|---|---|
UMM-C | ScienceKeywords/Category | String | Science Category Keywords | KMS controlled | Yes | 1 |
UMM-C | ScienceKeywords/Topic | String | Science Topic Keywords | KMS controlled | Yes | 1 |
UMM-C | ScienceKeywords/Term | String | Science Term Keywords | KMS controlled | Yes | 1 |
UMM-C | ScienceKeywords/VariableLevel1 | String | Science Variable_Level_1 Keywords | 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).
Please see the expandable sections below for flowchart details.
Dialect Mappings
UMM Migration
None
Future Mappings
History
UMM Versioning
Version | Date | What Changed |
---|---|---|
1.13.0 | Future | No changes were made for Science Keywords during the transition from version 1.12.0 to 1.13.0 |
1.12.0 | 01/22/2019 | No changes were made for Science Keywords during the transition from version 1.11.0 to 1.12.0. |
1.11.0 | 11/28/2018 | No changes were made for Science Keywords during the transition from version 1.10.0 to 1.11.0. |
1.10.0 | 05/02/2018 | No changes were made for Science Keywords during the transition from version 1.9.0 to 1.10.0. |
ARC Documentation
Version | Date | What Changed | Author |
---|---|---|---|
1.0 | 5/4/18 | Recommendations/priority matrix transferred from internal ARC documentation to wiki space |