Tracklines of a multibeam survey of the sea floor offshore of Shinnecock Inlet, New York, in 1998 (polyline shapefile, geographic, 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测深与反向散射强度开展了系统性调查测量。本次多波束测深调查的核心目标，是探明长岛南部沿岸沿20米等深线（isobath）分布的多处海域的海底地形与反向散射强度特征。调查区域覆盖火岛水道（Fire Island Inlet）、莫里奇斯水道（Moriches Inlet）、申尼科克水道（Shinnecock Inlet）近岸海域，以及蒙托克角（Montauk Point）西南海域，各单个调查区块宽约1千米、长约10千米。本次海底制图工作由美国地质调查局（U.S. Geological Survey）牵头完成，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。