RV Investigator Voyage IN2025_E01 EM2040 MKII Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2025_E01, Trials and calibrations, which departed Hobart on the 19th February 2025 and returned to Hobart on the 1st March, 2025.The EM2040MK2 provides a 0.4 degree by 0.7 degree angular resolution. The echosounder's nominal frequency is 400 kHz (with a range of 200-700 kHz) and it operated in dual swath mode. Data are stored in *.kmall raw format for bathymetry and backscatter and *.kmwcd format for water column backscatter at CSIRO. There are 202 files totalling 41.2 GB of raw data and 202 files totalling 556 GB of water column data in this dataset. Sound velocity profiles were applied to this data during data acquisition. Bathymetry data contained in *.kmall 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. Additional information regarding this dataset, including further information on processing streams, is contained in the GSM data acquisition and processing report.本数据集记录了“调查者号”（RV Investigator）航次IN2025_E01（试验与校准航次）采集的多波束测深声呐数据，该航次于2025年2月19日从霍巴特起航，2025年3月1日返回霍巴特。本次搭载的EM2040MK2型多波束测深系统具备0.4°×0.7°的角分辨率。该声呐的标称工作频率为400 kHz（工作频段范围为200~700 kHz），且以双条带模式运行。相关数据在澳大利亚联邦科学与工业研究组织（CSIRO）内分别以*.kmall原始格式存储测深与反向散射数据，以*.kmwcd格式存储水柱反向散射数据。本数据集包含原始数据文件202个，总容量41.2 GB；水柱数据文件202个，总容量556 GB。数据采集阶段已针对该数据集应用声速剖面校正。*.kmall格式存储的测深数据已完成运动与位置校正。已采用EGM2008地球重力场模型解算GPS潮汐数据，并将其应用于处理后的数据。处理后的数据已剔除异常值。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。