GeoTIFF image of the 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，科研团队依托加拿大海岸警卫队“弗雷德里克·G·克里德”号科考船搭载的Simrad EM1000多波束测深仪，开展了纽约长岛以南海域的海底水深与反向散射强度勘测。本次多波束测深勘测的核心目标为探查长岛南部沿岸沿20米等深线分布的多处海域的海底地形与反向散射强度特征。火岛河口、莫里奇斯河口、申尼科克河口外海以及蒙托克角西南的各勘测区域，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，加拿大海道测量局与新不伦瑞克大学提供支持。