RV Investigator Voyage IN2019_V03 EM710 MKII Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2019_V03, 2nd Indian Ocean Expedition Line which departed Fremantle on the 14/05/2019 and returned to Fremantle on the 14/06/2019.The Kongsberg EM710 MKII multibeam echosounder was used to acquire seafloor bathymetry and backscatter information watercolumn backscatter in the area of the Indian Ocean, 110° E.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.Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 825 files totalling 94.8 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.Tide corrections were not applied to the processed data. Processed data has had outliers removed. Processed line data are available in *.gsf and ascii format, and processed bathymetry and backscatter 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）IN2019_V03航次（第二次印度洋考察航线）采集的多波束回声测深仪（multibeam echosounder）数据，该航次于2019年5月14日从弗里曼特尔启航，6月14日返回弗里曼特尔。使用康士伯EM710 MKII多波束回声测深仪在东经110°的印度洋海域采集海底地形、反向散射信息及水体反向散射数据。EM710 MKII的发射角分辨率和接收角分辨率分别为0.5°和1°。该测深仪的标称频率范围为40至100千赫兹（kHz）。CSIRO将地形和反向散射的原始数据存储为*.all格式，水体反向散射数据存储为*.wcd格式。本数据集包含825个文件，原始数据总大小为94.8吉字节（GB）。数据采集期间已对数据应用了声速剖面（sound velocity profile）校正。*.all格式中的地形数据已进行运动和位置校正。处理后的数据未进行潮汐校正，且已去除异常值。处理后的测线数据以*.gsf和ASCII格式提供，处理后的地形和反向散射栅格数据以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）见GSM数据采集与处理报告。其他数据产品可根据需求提供。