GeoTIFF image of shaded-relief bathymetry, colored by backscatter intensity, of the sea floor southwest of Montauk Point, New York, in 1998 (3-m resolution, Mercator, WGS 84)

Surveys of the bathymetry and backscatter intensity of the sea floor south of Long Island, New York, were carried out in November 1998 using a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The purpose of the multibeam echosounder surveys was to explore the bathymetry and backscatter intensity of the sea floor in several areas off the southern coast of Long Island along the 20-meter isobath. Survey areas offshore of Fire Island Inlet, Moriches Inlet, Shinnecock Inlet, and southwest of Montauk Point were about 1 kilometer (km) wide and 10 km long. The area was mapped by the U.S. Geological Survey with support from the Canadian Hydrographic Service and the University of New Brunswick.1998年11月，研究团队依托搭载于加拿大海岸警卫队“弗雷德里克·G·克里德”号（Canadian Coast Guard ship Frederick G. Creed）科考船的Simrad EM1000多波束测深仪（multibeam echosounder），对美国纽约长岛以南海域的海底地形（bathymetry）与反向散射强度（backscatter intensity）开展了系统性测量作业。本次多波束测深调查的核心目标为，沿长岛南部海岸的20米等深线（20-meter isobath），对长岛近海多个区域的海底地形与反向散射强度进行探查与测绘。本次调查覆盖的区域包括火岛水道（Fire Island Inlet）、莫里奇斯水道（Moriches Inlet）、申尼科克水道（Shinnecock Inlet）近海区域，以及蒙托克角西南侧海域，上述区域宽度约1千米，长度约10千米。本次海域测绘工作由美国地质调查局（U.S. Geological Survey）主导完成，加拿大水文局（Canadian Hydrographic Service）与新不伦瑞克大学（University of New Brunswick）提供了技术支持。