RV Investigator Voyage IN2024_T01 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2024_T01, 'Transit Voyage: Fremantle to Hobart.' The primary objective of the voyage was the safe and timely transit of RV Investigator from Fremantle to Hobart in preparation for the following research voyage. During the transit various research projects were conducted, along with outreach, familiarisation and training activities. The voyage departed Fremantle on the 09 March and returned to Hobart on the 20 March.The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter between Fremantle and 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 592 files totalling 36.8 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）IN2024_T01航次（“过境航次：弗里曼特尔至霍巴特”）期间采集的多波束回声测深仪（multibeam echosounder）数据。该航次的首要目标是确保调查者号安全、及时地从弗里曼特尔航行至霍巴特，为后续研究航次做准备。过境期间开展了多项研究项目，同时进行了科普推广、设备熟悉及培训活动。航次于3月9日从弗里曼特尔启航，3月20日返回霍巴特。研究人员使用Kongsberg EM122多波束回声测深仪采集了弗里曼特尔至霍巴特海域的海底测深数据、反向散射信息及水体反向散射数据。EM122的角分辨率为1°×1°。该回声测深仪的标称频率为12 kHz。CSIRO存储的数据中，测深和反向散射数据采用*.all原始格式，水体反向散射数据采用*.wcd格式。本数据集包含592个文件，原始数据总量达36.8 GB。数据采集过程中已应用声速剖面。*.all格式中的测深数据已进行运动和位置校正。研究人员采用EGM2008模型计算GPS潮汐，并将其应用于处理后的数据。处理后的数据已剔除异常值。处理后的测线数据以*.gsf和ASCII格式提供，处理后的测深网格数据以GeoTIFF格式提供。关于本数据集的更多信息（包括处理流程的详细说明），请参见GSM数据采集与处理报告。更多数据产品可根据需求提供。