GeoTIFF image of shaded-relief bathymetry, colored by backscatter intensity, 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水深与反向散射强度开展了系统调查。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（20-meter isobath）分布的多个海域的海底水深与反向散射强度特征。调查区域覆盖火岛水道（Fire Island Inlet）、莫里切斯水道（Moriches Inlet）、申奈科克水道（Shinnecock Inlet）外侧海域以及蒙托克角（Montauk Point）西南海域，各单块调查区域宽度约1千米，长度约10千米。本次海底测绘制图作业由美国地质调查局（U.S. Geological Survey）主导实施，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。