1-m interval contours of smoothed multibeam bathymetry in western Massachusetts Bay map Quadrangle 3 (Q3_1MCTR.SHP)

The U.S. Geological Survey has conducted geologic mapping to characterize the sea floor offshore of Massachusetts. The mapping was carried out using a Simrad Subsea EM 1000 Multibeam Echo Sounder on the Frederick G. Creed on four cruises conducted between 1994 and 1998. The mapping was conducted in cooperation with the National Oceanic and Atmospheric Administration (NOAA) and with support from the Canadian Hydrographic Service and the University of New Brunswick. The long-term goal of this mapping effort is to produce high-resolution geologic maps and a Geographic Information System (GIS) project that presents images and grids of bathymetry, shaded relief bathymetry, and backscatter intensity data from these surveys that will serve the needs of research, management and the public.美国地质调查局（U.S. Geological Survey）已开展海底地质填图工作，以表征马萨诸塞州近海的海底特征。本次填图作业搭载于“弗雷德里克·G·克里德号”科考船，使用Simrad Subsea EM 1000型多波束测深仪，于1994年至1998年间完成四次科考航次。该填图工作与美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）合作开展，并获得加拿大水文局（Canadian Hydrographic Service）与新不伦瑞克大学（University of New Brunswick）的支持。 本次填图工作的长期目标是制作高分辨率地质图，以及一套地理信息系统（Geographic Information System，GIS）项目，该项目将展示本次勘测获取的水深地形、晕渲海底地形及反向散射强度数据的图像与网格数据，以满足科研、管理与公众的需求。