Color Shaded-Relief GeoTIFF Image Showing the 2-m Bathymetry Generated from National Oceanic and Atmospheric Administration (NOAA) Survey H11997 Offshore in Eastern Long Island Sound (H11997_2MMB_UTM18.TIF, 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。最初由NOAA为海图绘制工作采集的水深测量（Bathymetry）数据与侧扫声呐（sidescan-sonar）图像，为长岛海湾（Long Island Sound）内的科研与管理活动提供了核心基础框架，可直观呈现海床的组成与地形特征，并可提供沉积物运移与底栖生境（benthic habitat）相关的研究信息。2008年10月，NOAA完成了长岛海湾东部近海的编号为H11997的水文测量（hydrographic survey）任务；2010年5月，为开展该区域的地面验证（ground-truth）勘察工作，团队同步采集了海底照片与表层沉积物数据。研究人员基于多波束测深仪（multibeam echo-sounder）数据生成了两个解释性数据图层，并通过本次地面验证采集的数据对图层进行了核验。如需了解本次地面验证勘察的更多详情，请访问：http://quashnet.er.usgs.gov/data/2010/10015/