URI*
https://gcmd.earthdata.nasa.gov/kms/concepts/root
https://gcmd.earthdata.nasa.gov/kms/concepts/root
Abstract
An integral part of GCMD’s mission is the development and maintenance of GCMD keywords. These keywords ensure that metadata are described in a consistent manner and allow for precise searches of metadata records and subsequent retrieval of data and services. GCMD keywords are also used in other applications within the broader scientific community. Given the wide adoption of GCMD keywords within the broader community, it is critically important to document the processes NASA employs to ensure keywords continue to be relevant to the user and provider communities and evolve with their changing needs. The GCMD keywords are organized into 12 sets, (including Earth science keywords, platforms, instruments, data centers, locations, projects, services, and data resolution) described in Section 4. The term controlled refers to keywords that are predefined in a precise manner and continually evaluated for their usefulness and logical consistency in relation to the other keywords. Initiated over 20 years ago, these controlled GCMD keywords will be periodically analyzed for relevancy and will continue to be refined and expanded in response to user needs following the governance process defined in this document. Unless otherwise stated, the terms GCMD keywords and keywords should be understood to mean the controlled keywords that comprise the keyword vocabularies defined and maintained specifically by GCMD. A citation should be referenced when using GCMD keywords in scientific literature, websites, software tools, etc. Citation guidance and text is available on the GCMD Keyword Forum. See more...
Audience
Earth observation scientists See more...
Contact*
Earth Data Team (support@earthdata.nasa.gov)
Object creation date property
http://purl.org/dc/elements/1.1/created
http://purl.org/dc/elements/1.1/created
Submission date
March 28, 2025
Deprecated
false See more...
Description*
NASA's Global Change Master Directory (GCMD) holds more than 34,000 Earth science data set and service descriptions that cover subject areas within the Earth and environmental sciences. The mission of GCMD is to help researchers, policy makers, and the public find and access data and related services relevant to global change and Earth science research. Within this mission, GCMD offers online tools for providers of data and services to facilitate its use by the Earth science community. In addition, citation information to properly credit data set contributions is offered, along with direct links to data and services. See more...
Designed for task (as defined by OMV).
http://omv.ontoware.org/2005/05/ontology#AnnotationTask
http://omv.ontoware.org/2005/05/ontology#AnnotationTask
Documentation
https://wiki.earthdata.nasa.gov/display/ED/KMS+User%27s+Guide
https://wiki.earthdata.nasa.gov/display/ED/KMS+User%27s+Guide
Funded or sponsored by
NASA
Creator
NASA
Subject
Earth science See more...
Formality level
http://w3id.org/nkos/nkostype#terminology
http://w3id.org/nkos/nkostype#terminology
Representation language*
SKOS See more...
Syntax
http://www.w3.org/ns/formats/RDF_XML
http://www.w3.org/ns/formats/RDF_XML
Homepage
https://gcmd.earthdata.nasa.gov/
https://gcmd.earthdata.nasa.gov/
Generic type
http://omv.ontoware.org/2005/05/ontology#Vocabulary
http://omv.ontoware.org/2005/05/ontology#Vocabulary
Logo
https://www.earthdata.nasa.gov/themes/custom/project/hds_earthdata/nasa-logo.svg
https://www.earthdata.nasa.gov/themes/custom/project/hds_earthdata/nasa-logo.svg
Mailing list
ceos-idn-interop-join@lists.nasa.gov See more...
Object modification date property
http://purl.org/dc/elements/1.1/modified
http://purl.org/dc/elements/1.1/modified
Natural language
Preferred namespace prefix
gcmd See more...
Publisher
NASA
Access URL
https://raw.githubusercontent.com/EarthPortal/SA_integration/refs/heads/main/semantic_artefacts/gcmd_full.ttl
https://raw.githubusercontent.com/EarthPortal/SA_integration/refs/heads/main/semantic_artefacts/gcmd_full.ttl
Creation date*
March 28, 2025
Repository
https://gcmd.earthdata.nasa.gov/KeywordViewer/
https://gcmd.earthdata.nasa.gov/KeywordViewer/
Source
https://gcmd.earthdata.nasa.gov/kms/capabilities?format=html See more...
Status*
production See more...
URI Lookup Endpoint
https://earthportal.eu/search?ontologies=GCMD&require_exact_match=true&q=
search?ontologies=GCMD&require_exact_match=true&q=
Identifier pattern
https://gcmd.earthdata.nasa.gov/kms/ See more...

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