RV Investigator Voyage IN2017_V01 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2017_V01, 'Interactions of the Totten Glacier with the Southern Ocean through multiple cycles. ‘Sabrina Seafloor Survey' which departed Hobart on the 14th January 2017 and returned to Hobart on the 5th March 2017.

The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information between Hobart and Totten Glacier.

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 1310 files totalling 32.9 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, 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.

本记录描述的是RV Investigator（探索者号）科考航次IN2017_V01所采集的多波束测深数据（multibeam echosounder），该航次主题为"托滕冰川与南大洋的多循环相互作用"，别称"萨布丽娜海底调查"，于2017年1月14日从霍巴特启航，2017年3月5日返回霍巴特。

本次调查使用康士伯（Kongsberg）EM122多波束测深仪，采集霍巴特至托滕冰川海域的海底地形（水深）数据与反向散射（backscatter）信息。

EM122的角分辨率为1°×1°，该测深仪的标称工作频率为12 kHz。

本数据集的水深与反向散射原始数据以*.all格式存储，水柱反向散射（watercolumn backscatter）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）。本次数据集共包含1310个文件，总原始数据量达32.9 GB。

数据采集阶段已应用声速剖面（sound velocity profiles）校正。*.all格式存储的水深数据已完成运动与位置校正。

处理后的数据未进行潮汐校正（tide corrections），且已剔除异常值。处理后的测线数据以*.gsf与ASCII格式提供，处理后的水深与反向散射格网数据采用GeoTIFF格式存储。

有关本数据集的更多信息（包括处理流程）详见GSM数据采集与处理报告。额外的数据产品可应申请提供。