RV Investigator Voyage IN2021_E01 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2021_E01 (Trials and Calibration) which departed Hobart on the 10th November 2021 and returned to Hobart on the 14th November 2021. The purpose of this voyage was to undertake post port-period equipment calibrations and commissioning, sea trials and personnel training. The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter in Storm Bay and offshore to the southeast of Tasman Peninsula. The EM122 provides a 1 degree by 1 degree angular resolution. The echosounder's nominal frequency is 12 kHz. A patch test calibration was performed to determine the angular offsets of the system. Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 39 files totalling 1.31 GB of raw bathymetry (.all) data and 39 files totalling 1.82 GB of raw watercolum (.wcd) 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. GPS tide corrections were applied to the processed data using the EGM2008 model (EGM_2008_1Min_Aust_WGS84.csar). Processed data had outliers removed. Processed line data are available in *.gsf and ascii format, and processed bathymetry and backscatter grids in geotiff 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.

本记录描述了‘调查者号’（RV Investigator）航次IN2021_E01（试验与校准）采集的多波束测深仪（multibeam echosounder）数据。该航次于2021年11月10日从霍巴特启航，11月14日返回霍巴特。本次航次旨在开展港口停靠后的设备校准与调试、海上试验及人员培训。本数据集采用康斯伯格（Kongsberg）EM122多波束测深仪，在风暴湾（Storm Bay）及塔斯曼半岛东南近海海域获取了海底地形、后向散射信息及水体后向散射数据。该EM122测深仪的角分辨率为1°×1°，标称频率为12 kHz。本次作业开展了贴块试验校准（patch test calibration），以确定系统的角度偏移量。数据分别以*.all原始格式存储水深与后向散射数据、以*.wcd格式存储水体后向散射数据，存储于澳大利亚联邦科学与工业研究组织（CSIRO）。本数据集包含39个原始水深（.all）数据文件，总容量1.31 GB；以及39个原始水体后向散射（.wcd）数据文件，总容量1.82 GB。数据采集阶段已对数据集应用声速剖面校正。*.all格式存储的水深数据已完成运动与位置校正。处理后的数据采用EGM2008模型（EGM_2008_1Min_Aust_WGS84.csar）进行了GPS潮汐校正。已对处理后的数据剔除异常值。处理后的测线数据可通过*.gsf及ASCII格式获取，处理后的水深与后向散射网格数据可通过GeoTIFF格式获取。有关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。额外数据产品可根据需求提供。