GeoTIFF image of shaded-relief bathymetry of the sea floor offshore of Fire Island Inlet, 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水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：沿20米等深线（20-meter isobath），探测长岛南部近海多个区域的海底地形与反向散射强度特征。此次调查覆盖的区域包括火岛航道（Fire Island Inlet）、莫里奇斯航道（Moriches Inlet）、申尼科克航道（Shinnecock Inlet）近海海域，以及蒙托克角（Montauk Point）西南海域，各调查区块宽度约1千米，长度约10千米。本次海底测绘工作由美国地质调查局（U.S. Geological Survey）牵头实施，并获得加拿大海道测量局（Canadian Hydrographic Service）与新不伦瑞克大学（University of New Brunswick）的技术支持。