RV Investigator Voyage IN2022_T01 EM710 MKII Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2022_T01, titled "Transit: Cairns to Darwin 2022." The voyage took place between September 11, 2022 and September 17, 2022 (AEST), departing from Cairns and returning to Darwin.The Kongsberg EM710 MKII multibeam echosounder was used to acquire seafloor bathymetry and backscatter information and watercolumn backscatter between Cairns and Darwin.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. During this voyage, the frequency range was set to 70 to 100 kHz.Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 155 *.all files totaling 94.8 GB of raw bathymetry/backscatter data and 129 *.wcd files totaling 399 GB of watercolumn 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. Predicted tides were applied to the first 10 lines of the dataset due to lack of accurate GPS heighting available. 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.

本记录记述了搭载于“调查者号”（RV Investigator）科考船的航次IN2022_T01所采集的多波束测深声呐（multibeam echosounder）数据，该航次主题为「往返航行：2022年凯恩斯至达尔文港」。
本次航次于2022年9月11日至2022年9月17日（澳大利亚东部标准时间，AEST）执行，起航点为凯恩斯港，终到港为达尔文港。
本航次使用康斯伯格（Kongsberg）EM710 MKII型多波束测深声呐，采集了凯恩斯港至达尔文港航线上的海底水深地形数据（bathymetry）、反向散射（backscatter）信息以及水体柱反向散射数据。
该EM710 MKII型声呐的发射与接收角分辨率分别为0.5°与1°，标称工作频率范围为40~100 kHz，本次航次中实际设置的频率范围为70~100 kHz。
本数据集的存储格式如下：水深与反向散射原始数据采用*.all格式存储，水体柱反向散射数据采用*.wcd格式存储，相关数据由澳大利亚联邦科学与工业研究组织（CSIRO）托管。
本数据集包含155个*.all格式文件，总数据量达94.8 GB，对应原始水深/反向散射数据；另有129个*.wcd格式文件，总数据量为399 GB，对应水体柱数据。
数据采集阶段已对该数据集应用声速剖面校正。
*.all格式存储的水深数据已完成运动与位置校正。
已采用EGM2008地球重力模型计算GPS潮高校正值，并将其应用于预处理后的数据。
由于缺乏精确的GPS高程数据，本数据集前10条测线采用预报潮汐进行校正。
预处理后的数据已剔除异常值。
预处理后的测线数据可通过*.gsf格式与ASCII格式获取，预处理后的水深网格数据则采用GeoTIFF格式存储。
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。
其他衍生数据产品可根据申请提供。