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One of the Distributed Active Archive Centers (DAACs) in the Earth Observing System Data and Information System (EOSDIS) of the U.S. National Aeronautics and Space Administration (NASA), the Socioeconomic Data and Applications Center builds and maintains data sets, applications, and services at global, regional, and national levels to support the integration of socioeconomic and Earth science data. SEDAC maintains a catalog of its data holdings, which can be browsed or searched for data discovery and access. Browse and search results are returned in the form of data set pages containing author, purpose, abstract, data format, website, download, maps, and suggested citation, as well as the full FGDC metadata record in .html, .xml, and txt formats.

World Data Center (WDC) for Human Interactions in the Environment

The World Data Center for Human Interactions in the Environment is a portal to a wide range of global data focusing on population, sustainability, poverty, health, hazards, conservation, governance, and climate. The WDC provides browse and search tools for data discovery and access utilizing GeoNetwork, an open source catalog application for managing spatially referenced resources developed by the United Nations Food and Agriculture Organization (FAO). Browse and search results are returned in the form of data set profiles containing author, year of publication, abstract, keyword, suggested citation, full FGDC metadata record, and data set visualization, along with links to data download, data and project Web sites, news, FAQs and citations.

Formerly the Geospatial One Stop (GOS), the portal provides more than 400,000 (primarily geospatial) datasets from 172 agencies across the federal government, along with applications, live data and maps, documents, planned data activites, and communities.

Global Change Master Directory (GCMD)

Unlike the Clearinghouse Activity, which is a distributed system of catalogs that can be searched across one interface, the Global Change Master Directory (GCMD) provides a centralized catalog for more than 24,000 metadata descriptions of data sets and services from over 1,500 national and international organizations. The mission of the GCMD is "to assist the scientific community in the discovery of and linkage to Earth science data (and to related services), as well as to provide data holders a means to advertise their data to the Earth Science Community." It was developed to describe and catalog Earth science and Global Change related datasets from a wide variety of disciplines, and serves the user community in the discovery of Earth science data. As an additional service for the Earth sciences community, GCMD offers descriptive information about commercial and non-commercial data services that assists its user community in analyzing, processing, and evaluating Earth science datasets.

Earth Observing System ClearingHOuse (ECHO)

The Earth Observing System 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. REVERB - The Next Generation Earth Science Discovery Tool is a modernized browse, search, and order tool for the Eos ClearingHOuse, containing more than 2,400 data sets archived at EOSDIS data centers.

United States Geological Survey (USGS) Core Science Clearinghouse

Formerly the National Biological Information Infrastructure (NBII) Metadata Clearinghouse, this resource allows scientists to share and access information about important research in natural resources, containing over 90,000 records from over 80 data providers.

Columbia University Libraries Digital Social Science Center (DSSC) Data Service

Formerly the Electronic Data Service, the Digital Social Science Center Data Service is operated jointly by the Columbia University Libraries and Columbia University Information Technology (CUIT) to support instruction and research that involve numeric and geospatial data resources. EDS maintains a library of data and documentation that covers a wide range of topics, both national and international, including so socio-demographic topics, public opinion polls, politics, health, and economics. The current inventory includes data files from well over a thousand studies, comprising thousands of data files. Much of the data is online and accessible through the web, but Census and other data from governments and international agencies are also available on CD-ROMs. EDS provides GIS and Statistical Data Resources, which includes the CU Spatial Data Catalog utilizing GeoNetwork Opensource, hosted by CIESIN.

Discovery, Access, and Delivery of Data for IPY (DADDI)

Discovery, Access, and Delivery of Data for IPY (DADDI) is a NASA supported project aiming to improve the availability of arctic coastal data by developing a system that can be readily extended to support the International Polar Year (IPY). DADDI is a collaborative project between the National Snow and Ice Data Center (NSIDC), Oak Ridge National Laboratory Distributed Active Archive Center for Biogeochemical Dynamics (ORNL DAAC), Socioeconomic Data and Applications Center (SEDAC) at Columbia University, and the Canadian Cryospheric Information Network (CCIN), in addition to the International Permafrost Association's Arctic Coastal Dynamics (ACD) project and the interagency Study of Environmental Arctic Change (SEARCH).

The project has two phases. The first phase focuses on identification, acquisition, and description of data to facilitate discovery and will build off ORNL's Mercury toolset for metadata harvesting, indexing, and searching. The second phase centers on the advertisement, visualization, and delivery of the data in a manner that facilitates analysis. As the system develops, the site will provide tools for registering and accessing arctic coastal data.


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