Introduction
The National Oceanographic Data Center (NODC) is one of the national environmental data centers operated by the National Oceanic and Atmospheric Administration (NOAA) of the U.S. Department of Commerce. The main NODC facility is located in Silver Spring, Maryland and is made up of five divisions (see the NODC organizational chart). The NODC also has field offices collocated with major government or academic oceanographic laboratories in Stennis Space Center, MS; Miami, FL; La Jolla, CA; Seattle, WA, and Honolulu, HI.

Besides the NODC, NOAA operates two other data centers:
National Climatic Data Center (NCDC), Asheville, North Carolina National Geophysical Data Center (NGDC), Boulder, Colorado

Also, the National Snow and Ice Data Center* (NSIDC) in Boulder, Colorado is operated for NGDC by the University of Colorado through the Cooperative Institute for Research on Environmental Sciences (CIRES).

These discipline-oriented centers serve as national repositories and dissemination facilities for global environmental data. The data archives amassed by the NODC and the other centers provide a record of Earth's changing environment and support numerous research and operational applications. Working cooperatively, the centers provide data products and services to scientists, engineers, resource managers, policy makers, and other users in the United States and around the world.

NODC History and Mission
Established in 1961, the NODC was originally an interagency facility administered by the U.S. Naval Hydrographic (later Oceanographic) Office. The NODC was transferred to NOAA in 1970 when NOAA was created by Executive Order. In the words of its charter, the NODC serves to "acquire, process, preserve, and disseminate oceanographic data." Its primary mission is to ensure that global oceanographic data sets collected at great cost are maintained in a permanent archive that is easily accessible to the world science community and to other users.

Core Mission Description
The National Oceanographic Data Center (NODC) is an enterprise organization that provides scientific and public stewardship for national and international marine environmental and ecosystem data and information. The National Oceanographic Data Center, National Coastal Data Development Center (NCDDC) and NOAA Central Library, with its regional branch assets, are integrated to provide access to the world's most comprehensive sources of marine environmental data and information. NODC maintains and updates a national ocean archive with environmental data acquired from domestic and foreign activities and produces products and research from these data which help monitor global environmental changes. These data include physical, biological and chemical measurements derived from in situ oceanographic observations, satellite remote sensing of the oceans, and ocean model simulations. NODC manages and operates the World Data Center (WDC) for Oceanography, Silver Spring. Its personnel directly interact with Federal, state, academic, and industrial oceanographic activities, represent NESDIS on various interagency domestic panels, committees and councils, and represent the United States in various international organizations, such as the International Oceanographic Data Exchange. The Data Center represents NESDIS and NOAA to the general public, government agencies, private institutions, foreign governments, and the private sector on matters involving oceanographic data.

NODC Data Holdings
The NODC manages the world's largest collection of publicly available oceanographic data. NODC holdings include in situ and remotely sensed physical, chemical, and biological oceanographic data from coastal and deep ocean areas. These were originally collected for a variety of operational and research missions by U.S. Federal agencies, including the Department of Defense (primarily the U.S. Navy); by State and local government agencies; by universities and research institutions; and private industry. NODC data holdings extend back over one hundred years, and the volume is expected to grow exponentially as new ocean observing systems are deployed.

Through NODC archive and access services these ocean data are being reused to answer questions about climate change, ocean phenomena, and management of coastal and marine resources, marine transportation, recreation, national security, and natural disasters. Another significant user community is Education, where these data and information products help teach each new generation of students about the oceans. Requests for oceanographic data and information have increased each year since the Center was established in 1961.

International Cooperation and Data Exchange
A significant percentage of the oceanographic data held by NODC is foreign. NODC acquires foreign data through direct bilateral exchanges with other countries, and through the facilities of the World Data Center for Oceanography, Silver Spring, which is collocated with and operated by NODC.

There are three World Data Centers for Oceanography:
World Data Center, Silver Spring, Maryland, United States,
World Data Center, Moscow, Russia, and
World Data Center, Tianjin, People's Republic of China.
They are part of the World Data Center System initiated in 1957 to provide a mechanism for data exchange, and they operate under guidelines issued by the International Council of Scientific Unions (ICSU).

Under NODC leadership, the Global Data Archeology and Rescue (GODAR) project has grown into a major international program sponsored by the Inter-governmental Oceanographic Commission. GODAR is a comprehensive effort to locate, rescue, quality control, and disseminate historical global ocean profile data for use by the climate and global change research community. For more information, check out NODC's International Activities page.

Data Management for Global Change Studies
The NODC provides data management support for major ocean science projects such as TOGA (Tropical Ocean-Global Atmosphere), WOCE (World Ocean Circulation Experiment), and JGOFS (Joint Global Ocean Flux Study). To promote improved working relations with the academic ocean research community, the NODC established three joint centers with university research groups.
1. Joint Environmental Data Analysis Center (with Scripps Institution of Oceanography, University of California at San Diego)
2. Joint Archive for Sea Level (with the University of Hawaii)
3. Joint Center for Research in the Management of Ocean Data
(with the University of Delaware)

NOAA Library and Information Network
The NODC also manages the NOAA Library and Information Network, which includes the NOAA Central Library in Silver Spring, MD; regional libraries in Miami, FL and Seattle, WA; and field libraries or information centers at about 30 NOAA sites throughout the United States. The combined libraries contain millions of volumes including books, journals, CD-ROMs, DVDs, audio, and video tapes.

User Services
Each year the NODC responds to thousands of requests for oceanographic data and information. Copies of specified data sets or data selected from the NODC's archive databases can be provided to users on various media types, or online. NODC data products are provided at prices that cover the cost of data selection and retrieval. Most data provided on the NODC Web site is free of charge.

Requests for further information about the NODC and its data holdings, products and services should be directed to:

National Oceanographic Data Center
User Services
NOAA/NESDIS E/OC1
SSMC3, 4th Floor
1315 East-West Highway
Silver Spring, Maryland 20910-3282
Telephone: 301-713-3277
Fax: 301-713-3302
E-mail: NODC.Services@noaa.gov