1-m interval contours of smoothed multibeam bathymetry in western Massachusetts Bay map Quadrangle 1 (Q1_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）开展了地质填图工作，旨在表征马萨诸塞州近海的海底特征。本次填图作业依托"弗雷德里克·G·克里德"号（Frederick G. Creed）科考船，于1994年至1998年间的四次巡航任务中完成，所用设备为Simrad Subsea EM 1000多波束测深仪。本次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，并得到加拿大水文局与新不伦瑞克大学的支持。 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，该项目将呈现本次勘测获取的水深数据、晕渲水深数据与反向散射强度数据的影像及栅格数据，以满足科研、管理与公众的相关需求。