Raw multibeam backscatter data of the South East Tasmania Shelf

Geoscience Australia carried out marine surveys in southeast Tasmania in 2008 and 2009 (GA0315) to map seabed bathymetry and characterise benthic environments through observation of habitats using underwater towed video. Data was acquired using the Tasmania Aquaculture and Fisheries Institute (TAFI) Research Vessel Challenger. Bathymetric mapping was undertaken in seven survey areas, including: Freycinet Pensinula (83 sq km, east coast and shelf); Tasman Peninsula (117 sq km, east coast and shelf); Port Arthur and adjacent open coast (17 sq km); The Friars (41 sq km, south of Bruny Island); lower Huon River estuary (39 sq km); D Entrecastreaux Channel (7 sq km, at Tinderbox north of Bruny Island), and; Maria Island (3 sq km, western side). Video characterisations of the seabed concentrated on areas of bedrock reef and adjacent seabed in all mapped areas, except for D Entrecastreaux Channel and Maria Island.

The "challenger" folder contains raw multibeam backscatter data from two surveys archived seperately in 0306_tasman1 and 0315_se_tasmania. The raw multibeam backscatter data were collected along survey lines using GAs Kongsberg SIMRAD EM3002 in single head configuration from aboard MV Challenger.

澳大利亚地质调查局（Geoscience Australia）于2008年与2009年在塔斯马尼亚东南部开展了编号为GA0315的海洋调查，旨在通过水下拖曳视频观测生境，绘制海床水深地形图并表征底栖环境。本次调查依托塔斯马尼亚水产与渔业研究所（TAFI）的"挑战者号"研究船开展。此次水深测绘覆盖7个调查区域，具体包括：菲辛纳半岛（83平方千米，东海岸及陆架区域）、塔斯曼半岛（117平方千米，东海岸及陆架区域）、亚瑟港及邻近开放海岸（17平方千米）、修士群岛（41平方千米，布鲁尼岛以南）、休恩河下游河口（39平方千米）、德恩特雷卡斯托海峡（7平方千米，布鲁尼岛以北廷德博克海域）以及玛丽亚岛（3平方千米，西侧区域）。海床视频表征工作覆盖所有测绘区域内的岩礁及相邻海床，但德恩特雷卡斯托海峡与玛丽亚岛除外。

"挑战者号"文件夹存储了两次调查的原始多波束反向散射数据，该数据分别归档于0306_tasman1与0315_se_tasmania两个目录中。原始多波束反向散射数据由搭载于"挑战者号"研究船上的澳大利亚地质调查局（GA）的Kongsberg SIMRAD EM3002单探头构型设备沿测线采集得到。