The EOS ClearingHOuse (ECHO) is a clearinghouse of spatial and temporal metadata enabling the science community to exchange data and information. ECHO technology can provide services and work as an order broker for Client and Data partners while supporting efficient discovery and access to Earth Science data.
NASA's Earth Science Data and Information System (ESDIS) is building ECHO based on Extensible Markup Language (XML) and Web Service technologies. ECHO interfaces with different clients and users through its series of Application Program Interfaces (APIs). ECHO is an open system with published APIs available to the ECHO Development and User community.
ECHO acts as middleware between data partners and client partners. Data Partners provide information about their data holdings, and client partners develop software to access this information. End users who want to search ECHO's metadata must use one of the ECHO clients.
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WIST, the Warehouse Inventory Search Tool, is a web-based client for searching and ordering earth science data from various NASA and affiliated centers.. Users can submit cross-discipline queries using spatial and temporal criteria, examine search results for relevancy using built-in tools, and submit orders via ECHO to the appropriate data providers. http://wist.echo.nasa.gov
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and Accessibility Certification