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The Center for Coastal and Ocean Mapping [1] (CCOM) / NOAA-UNH Joint Hydrographic Center (JHC) was founded in 2000 by Dr. Larry Mayer to find ways to process the massive amounts of data coming from sonar systems at rates commensurate with data collection; that is, to make the data ready for chart production as rapidly as the data could be collected.
A global relief model, sometimes also denoted as global topography model or composite model, combines digital elevation model (DEM) data over land with digital bathymetry model (DBM) data over water-covered areas (oceans, lakes) to describe Earth's relief. A relief model thus shows how Earth's surface would look like in the absence of water or ...
The models show two possibilities side-by-side: the results if emissions are reduced and the Earth warms only by 1.5C, and the results if emissions continue to increase and the Earth warms to 3C ...
Environmental data are collected from many sources, including satellites, land-based stations, ocean buoys, ships, remotely operated underwater vehicles, weather balloons, radar, forecasting and climate models, and paleoclimatological research. Once transmitted to NCEI, data are archived and made available for use by researchers and others in ...
The Office of Coast Survey employs about 250 United States Government employees and about 50 contractor personnel. [3] It is organized into four components: [3] The Marine Chart Division, responsible for processing nautical data, producing raster, paper, and electronic charts, and making critical corrections to charts.
The result of this process is an orthoimage, a scale image which includes corrections made for feature displacement such as building tilt. These corrections are made through the use of a mathematical equation, information on sensor calibration, and the application of digital elevation models. [20]
Topographic maps display elevation above ground and are complementary to bathymetric charts. Bathymetric charts showcase depth using a series of lines and points at equal intervals, called depth contours or isobaths (a type of contour line). A closed shape with increasingly smaller shapes inside of it can indicate an ocean trench or a seamount ...