Earthdata

Introduction

NASA's Global Change Master Directory (GCMD) provides access to more than 34,000 Earth science data set and service descriptions (stored in NASA's Common Metadata Repository [CMR]) which cover subject areas within Earth and environmental sciences. GCMD's mission is to assist researchers, policy makers, and the public in the discovery of and access to data and related services relevant to global change and Earth science research. The project also serves as one of NASA’s contributions to the Committee on Earth Observation Satellites (CEOS) International Directory Network (IDN).

To aid in the search and discovery effort, controlled keywords have been developed and are regularly being refined and expanded. These keywords are also used in other applications within the broader scientific community. Users may perform searches through the GCMD website using the controlled keywords, free-text searches, map/date searches, or any combination of the above; and may also search or refine a search by data center, instrument, platform, project, or temporal/spatial resolution.

GCMD also supports docBUILDER, a metadata authoring tool, and portals, virtual subset of the complete content of the directory.

GCMD Keyword Information

The information provided on this page defines how GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.

Contact Information

Valerie Dixon, NASA Official, Code 400
Valerie.W.Dixon@nasa.gov

URL: https://gcmd.nasa.gov/