RV Investigator Voyage IN2021_E02 EM710 MKII Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2021_E02, 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 for this voyage were testing the Deep Corer winch stream and respool, Trawling winch calibration, CTD winch 1 & 2 calibrations, HOTS commissioning and Heave Compensation testing, and Deep Towed Camera trial and calibration. The voyage took place between November 20 and November 28, 2021, departing from Hobart (TAS) and returning to Hobart.

The Kongsberg EM710 MKII multibeam echosounder was used to acquire seafloor bathymetry and backscatter information and watercolumn backscatter around east of Tasmania and around Freycinet Marine Park.

The EM710 MKII provides a 0.5° by 1° transmit and receive angular resolution respectively. The echosounder's nominal frequency range is from 40 to 100 kHz.

Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 32 files totalling 12.2 GB of raw data in this dataset and 30 files totalling 39.7 GB of watercolumn data.

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 data has 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 further 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）科考船IN2021_E02航次采集的多波束测深声呐（multibeam echosounder）数据，本次航次旨在对该船搭载的新型、升级及现有关键设备进行校准与调试（含海上试验与人员培训），以保障2021年既定航次及后续任务的顺利开展。本次航次的核心任务包括：深孔取样绞车缆绳与重新绕缆测试、拖网绞车校准、温盐深仪（CTD）1号与2号绞车校准、HOTS系统调试与升沉补偿测试，以及深拖相机系统的试验与校准。本次航次于2021年11月20日至11月28日执行，从塔斯马尼亚州霍巴特港启航并返回该港。

本次航次采用Kongsberg EM710 MKII型多波束测深声呐，在塔斯马尼亚岛东部海域及弗雷西内特海洋公园周边海域，采集了海底地形（bathymetry）、反向散射信号以及水体柱反向散射数据。

EM710 MKII型声呐的发射与接收角分辨率分别为0.5°×1°，其标称工作频率范围为40 kHz至100 kHz。

本数据集的海底地形与反向散射原始数据以*.all格式存储，水体柱反向散射数据以*.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）。本数据集包含32个原始数据文件，总容量为12.2 GB；另有30个水体柱数据文件，总容量为39.7 GB。

数据采集阶段已对数据集施加声速剖面校正。*.all格式存储的海底地形数据已完成运动校正与位置校正。

处理后的数据已通过Caris软件，基于实时动态差分定位（RTK）/GPS高程数据与EGM2008地球重力场模型完成潮汐校正。已对处理后的数据剔除异常值。处理后的测线数据可获取为*.gsf格式与ASCII格式，处理后的海底地形与反向散射网格数据可获取为GeoTIFF格式。

有关本数据集的更多信息（包括处理流程的详细说明）收录于GSM数据采集与处理报告中。额外的数据产品可根据申请提供。