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.

澳大利亚地质科学局（Geoscience Australia）于2008年至2009年间在塔斯马尼亚东南部开展了两次海洋勘测（项目编号GA0315），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。本次数据采集依托塔斯马尼亚水产与渔业研究所（Tasmania Aquaculture and Fisheries Institute, TAFI）的"挑战者号"研究船（Research Vessel Challenger）完成。本次水深测绘共覆盖7个勘测区域，具体包括：菲欣纳半岛（Freycinet Peninsula，83平方千米，东海岸及陆架区）、塔斯曼半岛（Tasman Peninsula，117平方千米，东海岸及陆架区）、阿瑟港及邻近开放海岸（17平方千米）、修士群岛（The Friars，41平方千米，布鲁尼岛以南海域）、休恩河下游河口（lower Huon River estuary，39平方千米）、德恩特卡斯特罗海峡（D Entrecastreaux Channel，7平方千米，位于布鲁尼岛以北的廷德博克斯区域）以及玛丽亚岛（Maria Island，3平方千米，西侧海域）。海床底栖环境的视频表征工作覆盖所有测绘区域内的岩礁及邻近海床，但德恩特卡斯特罗海峡与玛丽亚岛区域除外。"Challenger"文件夹包含两次勘测的原始多波束反向散射数据（multibeam backscatter data），该数据分别存档于0306_tasman1与0315_se_tasmania两个子目录中。上述原始多波束反向散射数据由澳大利亚地质科学局（GA）搭载于"MV Challenger"的Kongsberg SIMRAD EM3002单探头构型设备沿勘测航线采集获取。