RV Investigator Voyage IN2023_V07 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2023_V07, [FOCUS] which departed Hobart on the 15/11/23 and returned to Hobart on the 20/12/23.The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter around the Antarctic Circumpolar Current in the Southern Ocean, South of Hobart.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 1834 files totalling 105 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. GPS tide was computed using the EGM2008 model and applied to the processed data. Processed data has had outliers removed. Processed line data are available in *.gsf and ascii format, and processed bathymetry 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）科考航次IN2023_V07【FOCUS】所采集的多波束测深数据，该航次于2023年11月15日从霍巴特启航，2023年12月20日返回霍巴特。本航次使用康斯伯格EM122型多波束测深仪（Kongsberg EM122 multibeam echosounder），采集了霍巴特以南南大洋南极绕极流（Antarctic Circumpolar Current）海域的海底地形、反向散射信息以及水体柱反向散射数据。该EM122测深仪的角分辨率为1°×1°，标称频率为12千赫兹（kHz）。
数据由澳大利亚联邦科学与工业研究组织（CSIRO）存储：海底地形与反向散射原始数据采用*.all格式，水体柱反向散射原始数据采用*.wcd格式。本数据集共计1834个文件，总原始数据量达105吉字节（GB）。
数据采集阶段已对数据集应用声速剖面校正；*.all格式存储的海底地形数据已完成运动与位置校正。采用EGM2008模型计算GPS潮汐校正量，并应用于已处理数据；已处理数据已剔除异常值。
已处理的测线数据可获取为*.gsf格式与ASCII格式，已处理的海底地形栅格数据则采用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）均收录于《GSM数据采集与处理报告》中。其他数据产品可根据申请提供。