[6] For the Earth Observing System (EOS) satellite missions, EOSDIS provides capabilities for command and control, scheduling, data capture and initial (Level 0) processing.
The Distributed Active Archive Centers serve a large and diverse user community (as indicated by EOSDIS performance metrics) by providing capabilities to search and access science data products and specialized services.
Part of the congressional approval of the EOS mission in 1990[10] included the NASA Earth Science Enterprise, which supported the development of a long-term data and information system (EOSDIS).
This system would be accessible to both the science research community and the broader public, built on a distributed open architecture.
[12][13] In addition to the search-and-order capabilities provided by the Global Change Master Directory (GCMD) and the Common Metadata Repository (or CMR, which has replaced the former EOS Clearinghouse, or ECHO), the Distributed Active Archive Centers have individual online systems that allow them to provide unique services for users of a particular type of data.
Earthdata Search replaced Reverb as EOSDIS's web-based client for discovering and ordering cross-discipline data from all of CMR's metadata holdings in January 2018.
DAACs process, archive, document, and distribute data from NASA's past and current Earth Observing System (EOS) satellites and field measurement programs.