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.

本记录描述的是“调查者”号（RV Investigator）科考航次IN2022_T01采集的多波束测深仪（multibeam echosounder）数据，该航次主题为"Transit: Cairns to Darwin 2022"（2022年凯恩斯至达尔文航渡）。本航次于澳大利亚东部标准时间（AEST）2022年9月11日至9月17日执行，从凯恩斯启航并终抵达尔文。

本航次使用康斯伯格（Kongsberg）EM710 MKII型多波束测深仪，采集凯恩斯至达尔文航线上的海底测深地形（bathymetry）、反向散射（backscatter）信息以及水柱反向散射数据。

该EM710 MKII型测深仪的发射与接收角分辨率分别为0.5°×1°；其标称频率范围为40~100 kHz，本航次实际设置的频率范围为70~100 kHz。

本数据集的水深地形与反向散射原始数据存储为*.all格式，水柱反向散射数据存储为*.wcd格式，所有数据均存放于澳大利亚联邦科学与工业研究组织（CSIRO）。本数据集包含155个*.all格式文件，总大小为94.8 GB的原始水深地形/反向散射数据；以及129个*.wcd格式文件，总大小为399 GB的水柱数据。

数据采集阶段已针对该数据集应用声速剖面修正；*.all格式存储的水深地形数据已完成运动与位置校正。

已采用地球重力场模型EGM2008计算GPS潮位，并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条测线采用预报潮位进行校正。预处理数据已剔除异常值；预处理后的测线数据可通过*.gsf与ASCII格式获取，预处理后的水深地形网格数据则以GeoTIFF格式提供。

有关本数据集的更多信息（包括处理流程的详细说明）收录于《GSM数据采集与处理报告》中；额外的数据产品可按需申请获取。