Grid of the sea-floor bathymetry southwest of Montauk Point, New York, in 1998 (3-m resolution Esri binary grid, 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，研究团队搭乘加拿大海岸警卫队“弗雷德里克·G·克里德”号（Canadian Coast Guard ship Frederick G. Creed）科考船，搭载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测深与反向散射强度开展了系统性调查。本次多波束测深调查的核心目标为：探明长岛南部沿岸多个沿20米等深线（isobath）分布的近海区域的海底地形与反向散射强度特征。其中，火岛航道（Fire Island Inlet）、莫里奇斯航道（Moriches Inlet）、申尼科克航道（Shinnecock Inlet）近海区域，以及蒙托克角西南侧海域的调查范围均为宽约1千米、长约10千米。本次海底测绘工作由美国地质调查局（U.S. Geological Survey）主导实施，加拿大海道测量局（Canadian Hydrographic Service）与新不伦瑞克大学（University of New Brunswick）提供了协作支持。