GeoTIFF image of the 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，科研人员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）舰船的Simrad EM1000多波束测深仪（multibeam echosounder），对美国纽约州长岛以南海域的海底地形测量（bathymetry）与后向散射强度（backscatter intensity）开展了勘测工作。本次多波束测深勘测的核心目标，是沿20米等深线（isobath），对长岛南部沿岸的多处近海区域的海底地形与后向散射特征进行探测。火岛水道（Fire Island Inlet）、莫里奇斯水道（Moriches Inlet）、申尼科克水道（Shinnecock Inlet）近海区域以及蒙托克角（Montauk Point）西南侧的勘测区域，宽度约为1千米，长度达10千米。本次勘测的成图工作由美国地质调查局（U.S. Geological Survey）完成，加拿大水文局（Canadian Hydrographic Service）与新不伦瑞克大学（University of New Brunswick）提供了技术支持。