2-m Bathymetric Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H11997 Offshore in Eastern Long Island Sound (H11997_2M_UTM, UTM Zone 18, NAD83)

The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration (NOAA), is producing detailed geologic maps of the coastal sea floor. Bathymetry and sidescan-sonar imagery, originally collected by NOAA for charting purposes, provides a fundamental framework for research and management activities in Long Island Sound, shows the composition and terrain of the seabed, and provides information on sediment transport and benthic habitat. During October 2008 NOAA completed hydrographic survey H11997 offshore in eastern Long Island Sound, and during May 2010 bottom photographs and surficial sediment data were acquired as part of a ground-truth reconnaissance survey of this area. Two interpretive data layers were derived from the multibeam echo-sounder and the ground-truth data used to verify them. For more information on the ground-truth survey see http://quashnet.er.usgs.gov/data/2010/10015/美国地质调查局（U.S. Geological Survey, USGS）与美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）合作，正在编制沿海海底的详细地质图。原本由NOAA为海图绘制目的采集的水深测量（Bathymetry）数据与侧扫声呐图像（sidescan-sonar imagery），为长岛海湾（Long Island Sound）的科研与管理活动提供了基础框架，可展示海底的组成与地形，并提供有关泥沙运移（sediment transport）与底栖生境（benthic habitat）的相关信息。2008年10月，NOAA完成了长岛海湾东部近海的水文测量H11997（hydrographic survey H11997）；2010年5月，该团队为开展该区域的实地验证踏勘调查（ground-truth reconnaissance survey），采集了海底摄影（bottom photographs）数据与表层沉积物数据（surficial sediment data）。研究人员从多波束测深仪（multibeam echo-sounder）采集的数据以及用于验证该解释性图层的实地验证数据中，提取得到两个解释性数据图层。如需了解该实地验证调查的更多信息，请访问http://quashnet.er.usgs.gov/data/2010/10015/