RV Investigator Voyage IN2021_E03 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2021_E03, to calibrate and commission new, upgraded and existing critical equipment (with sea trials and personnel training) onboard RV Investigator for upcoming voyages in the 2021 schedule and beyond. The primary objectives were testing the Giant Piston and Kasten Corer as well as the Deep Towed Camera. The voyage departed Hobart PW04 on the 30/11/2021 and returned to Hobart PW04 on the 08/12/2021.

The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter in the region of South East Tasmania.

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 161 files totalling 11.96 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 applied to the processed data using RTK/GPS height and the EGM2008 geoid model in Caris. 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_E03所采集的多波束测深声呐（multibeam echosounder）数据，该航次旨在为“调查者号”船载关键设备开展新研、升级及现役设备的校准与试航作业（含海上试验与人员培训），以支撑2021年年度计划及后续航次任务。本次航次的核心目标为验证巨型活塞取样器与凯斯顿采泥器，以及深海拖曳摄像系统。该航次于2021年11月30日从霍巴特PW04码头起航，于2021年12月8日返回霍巴特PW04码头。

本次作业使用康士伯（Kongsberg）EM122多波束测深声呐，在塔斯曼尼亚东南部海域采集了海底地形测深数据、反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 kHz。

本数据集的测深与反向散射原始数据以*.all格式存储，水体柱反向散射原始数据以*.wcd格式存储，均存放于澳大利亚联邦科学与工业研究组织（CSIRO）。本数据集共包含161个文件，原始数据总容量达11.96 GB。

数据采集阶段已对该数据应用声速剖面校正。*.all格式存储的测深数据已完成运动与位置校正。

处理后的数据已通过Caris软件，结合实时动态差分（Real-Time Kinematic, RTK）/GPS高程数据与EGM2008大地水准面模型完成潮汐校正。处理后的测线数据以*.gsf与ASCII格式提供，处理后的测深与反向散射网格数据以GeoTIFF格式提供。

本数据集的相关补充信息（包括处理流程说明）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获取。