NOS_5m_INT_HS.tif: 5-meter hillshaded-relief image produced from 23 multibeam hydrographic surveys collected off the Delmarva Peninsula by the National Oceanic and Atmospheric Administration's National Ocean Service between 2006 and 2011 (GeoTIFF, UTM Zone 18N, WGS 84)

Between 2006 and 2011 Science Applications International Corporation (SAIC), under contract by the National Oceanic and Atmospheric Administration's (NOAA) National Ocean Service (NOS), collected twenty-three hydrographic surveys totaling over 4100 square-kilometers of Reson multibeam bathymetric and Klein sidescan-sonar data for the purposes of updating nautical charts. Data extended from the entrance of Delaware Bay south to Parramore Island in water depths from about 3 to 35 meters below mean lower low water. Data were collected at a fixed 40-meter line spacing which provided 40-100 percent seafloor coverage for multibeam bathymetry. NOS releases processed bathymetry via an interactive map interface in bathymetry attributed grid (BAG) format. All twenty-three survey datasets were downloaded, merged, resampled, and interpolated to fill data gaps. Sidescan data products are limited within the Delmarva survey area and there are no multibeam backscatter data products available. The U.S. Geological Survey obtained the raw Reson multibeam data files from SAIC and NOAA for twenty of the hydrographic surveys and extracted the backscatter data using Quality Positioning Service's (QPS) Fledermaus FMGeocoder Toolbox (FMGT) to produce backscatter mosaics for the inner-continental shelf of the Delmarva Peninsula. Backscatter mosaics and regional seamless bathymetric datasets created from NOAA data are a valuable tool for characterizing seafloor geology, sediment transport pathways, and marine resources. Additionally, obtaining this near full seafloor coverage backscatter and bathymetry dataset from an existing source greatly increased project deliverables, geophysical survey efficiency, collaboration among government agencies, and the area over which geologic data interpretations can be conducted by the USGS.

2006年至2011年间，科学应用国际公司（Science Applications International Corporation, SAIC）受美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）下属国家海洋服务局（National Ocean Service, NOS）委托，开展了23项水文测量工作，累计获取超过4100平方千米的Reson多波束测深与Klein侧扫声呐数据，用于更新海图。数据覆盖范围从特拉华湾入口向南延伸至帕拉莫尔岛，水深范围约为平均低潮面以下3米至35米。数据采集采用固定40米的测线间距，可实现多波束测深数据40%至100%的海底覆盖度。国家海洋服务局通过交互式地图界面发布经处理的测深数据，格式为测深属性网格（bathymetry attributed grid, BAG）。全部23项测量数据集均被下载、合并、重采样并插值以填补数据空白。德尔马瓦测量区域内的侧扫声呐数据产品较为有限，且暂无多波束反向散射数据产品可供使用。美国地质调查局从科学应用国际公司与美国国家海洋和大气管理局处获取了其中20项水文测量任务的原始Reson多波束数据文件，并通过优质定位服务（Quality Positioning Service, QPS）的Fledermaus FMGeocoder工具箱（FMGeocoder Toolbox, FMGT）提取反向散射数据，为德尔马瓦半岛的陆架内区域生成了反向散射镶嵌图。由美国国家海洋和大气管理局数据生成的反向散射镶嵌图与区域无缝测深数据集，是表征海底地质特征、沉积物输运路径与海洋资源的重要工具。此外，从现有数据源获取这套近乎全覆盖的反向散射与测深数据集，大幅提升了美国地质调查局的项目交付成果、地球物理勘测效率、政府机构间的协作水平，以及可开展地质数据解译的作业区域范围。