CAPENORTH_GEO4M_XYZ.TXT: ASCII formatted file of the 4-m bathymetry from the northern half of USGS survey 98015 of the Sea Floor off Eastern Cape Cod (Geographic)

This data set includes bathymetry of the sea floor offshore of eastern Cape Cod, Massachusetts. The data were collected with a multibeam sea floor mapping system during USGS survey 98015, conducted November 9 - 25, 1998. The surveys were conducted using a Simrad EM 1000 multibeam echosounder mounted aboard the Canadian Coast Guard vessel Frederick G. Creed. This multibeam system utilizes 60 electronically aimed receive beams spaced at intervals of 2.5 degrees that insonify a strip of sea floor up to 7.5 times the water depth (swath width of 100 to 200 m within the survey area). The horizontal resolution of the beam on the sea floor is approximately 10% of the water depth. Vertical resolution is approximately 1 percent of the water depth.

本数据集涵盖美国马萨诸塞州科德角以东近海海底的测深数据。该数据由多波束海底测绘系统（multibeam sea floor mapping system）采集，采集工作依托1998年11月9日至25日开展的美国地质调查局（USGS）98015号勘测项目完成。本次勘测使用安装于加拿大海岸警卫队“弗雷德里克·G·克里德”号科考船上的西姆拉德（Simrad）EM 1000型多波束测深仪（multibeam echosounder）。该多波束系统配备60个电子定向接收波束，波束间距为2.5度，可声扫覆盖宽度达水深7.5倍的海底条带，本次勘测区内条带宽度为100至200米。海底波束的水平分辨率约为水深的10%，垂直分辨率约为水深的1%。