RV Investigator Voyage IN2017_V03 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2017_V03, 'Sampling the abyss: latitudinal biodiversity patterns along the base of Australia’s eastern continental margin' which departed Bell Bay on the 15 May 2017 and returned to Brisbane on the 16 June 2017.The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry and backscatter information at sampling sites along the East Coast of Australia, including several Commonwealth Marine Reserves.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 at CSIRO. There are 675 files totalling 16.6 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 had outliers removed. Processed line data are available in *.gsf and ascii format.Additional information regarding this dataset, including 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’科考船（RV Investigator）IN2017_V03航次期间采集的多波束回声测深仪（multibeam echosounder）数据。该航次的主题为‘深渊采样：澳大利亚东部大陆边缘底部的纬度生物多样性模式’，于2017年5月15日从贝尔湾启航，2017年6月16日返回布里斯班。本次调查使用康士伯（Kongsberg）EM122多波束回声测深仪，在澳大利亚东海岸的采样点（包括多个联邦海洋保护区）采集海底地形和反向散射信息。EM122的角分辨率为1°×1°，标称频率为12千赫兹（kHz）。CSIRO（澳大利亚联邦科学与工业研究组织）存储的地形和反向散射原始数据采用*.all格式。本数据集包含675个文件，原始数据总大小为16.6吉字节（GB）。数据采集过程中已对该数据应用声速剖面。*.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。处理后的测线数据可提供*.gsf和ASCII格式。关于本数据集的更多信息（包括处理流程相关内容）载于GSM数据采集与处理报告中。其他数据产品可根据需求提供。