Grid of the sea-floor bathymetry offshore of Moriches Inlet, 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），对纽约长岛以南海域开展海底地形测深（bathymetry）与反向散射强度（backscatter intensity）调查作业。本次多波束测深调查的目的为探明长岛南部沿海沿20米等深线（20-meter isobath）分布的多个区域的海底地形与反向散射特征。其中，费尔岛水道（Fire Island Inlet）、莫里奇斯水道（Moriches Inlet）、申尼科克水道（Shinnecock Inlet）近海及蒙托克角（Montauk Point）西南侧的测量区域，单块范围均为宽约1千米（km）、长约10千米。本次调查由美国地质调查局（U.S. Geological Survey）牵头实施，加拿大海道测量局（Canadian Hydrographic Service）与新不伦瑞克大学（University of New Brunswick）提供协作支持。