NOAA's National Oceanographic Data Center (NODC) is an organization that provides scientific and public stewardship for national and international marine environmental and ecosystem data and information. With its regional branch assets and divisions, NODC is 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.