RV Investigator Voyage IN2015_C01 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator research charter IN2015_C01, 'GAB deep water geological and benthic ecology program,' which departed Hobart on the 25 October and returned to Port Lincoln on the 28 November. A short sea trial voyage (October 22 - 25, Hobart - Hobart) was undertaken prior to the charter. Data for those days is also included in this data set.The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter.The EM122 provides a 1 degree by 1 degree angular resolution. The echosounder's nominal frequency is 12 kHz.Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 1658 files totalling 58.5 GB of raw data in this dataset.Sound velocity profiles were applied to this data during data acquisition. Bathymetry data contained in *.all format are corrected for motion and position.Tide corrections were not applied to the processed data. Processed data had outliers removed. Processed line data are available in *.gsf and ascii format.Additional information regarding this dataset, including information on processing streams, is contained in the GSM data acquisition and processing report. Additional data products may be available on request.

本记录描述的是搭载于“调查者号”（RV Investigator）科考船的科研租船航次IN2015_C01所采集的多波束测深声呐（multibeam echosounder）数据，该航次的项目为“GAB深水地质与底栖生态计划”，于10月25日从霍巴特出发，11月28日返回林肯港。在该航次正式开展前，还进行了一次短途海上试航（10月22日-25日，霍巴特往返霍巴特），试航期间采集的数据也已纳入本数据集。本数据集采用康斯伯格（Kongsberg）EM122多波束测深声呐采集海底地形测深数据、后向散射信息以及水体柱反向散射数据。该EM122声呐的角分辨率为1°×1°，标称工作频率为12千赫（kHz）。海底地形测深与后向散射数据以*.all原始格式存储，水体柱反向散射数据以*.wcd格式存储，相关数据托管于澳大利亚联邦科学与工业研究组织（CSIRO）。本数据集共包含1658个文件，原始数据总容量达58.5吉字节（GB）。数据采集阶段已对数据集应用声速剖面校正；存储于*.all格式中的海底测深数据已完成运动与位置校正，但经处理的数据未进行潮汐校正。经处理的数据已剔除异常值，处理后的测线数据可通过*.gsf格式与ASCII格式获取。关于本数据集的更多信息（包括处理流程相关内容）均收录于《GSM数据采集与处理报告》中。其他额外数据产品可根据申请提供。