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）的Simrad EM1000多波束测深仪（multibeam echosounder），开展了纽约长岛以南海底水深与反向散射强度勘测工作。本次多波束测深勘测的核心目标为探索长岛南部沿岸沿20米等深线分布的多处海域的海底水深与反向散射强度特征。本次勘测涵盖火岛航道（Fire Island Inlet）、莫里奇斯航道（Moriches Inlet）、申尼科克航道（Shinnecock Inlet）外海以及蒙托克角西南侧共四处海域，单块区域宽度约1千米，长度约10千米。本次海底测绘项目由美国地质调查局（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）提供技术支持。