RV Investigator Voyage IN2018_T02 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2018_T02, 'Harmful Algal Blooms and their long term sediment record in East Coast Tasmanian waters' which departed Brisbane on the 14th May 2018 and returned to Hobart on the 21st May 2018. The overall objective of this transit voyage was aimed at addressing the following research topics:1. Harmful Algal Blooms and their long term sediment record in East Coast Tasmanian waters; 2. Spatial and temporal variability in the distribution and abundance of seabirds and 3. Remote-ROAM: mobile modelling sea trials.

The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information between Brisbane 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 161 files totaling 8.9 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, and processed bathymetry and backscatter grids in geotiff 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"RV Investigator"号科考船IN2018_T02航次采集的多波束测深数据。该航次主题为《塔斯曼尼亚东海岸水域有害藻华及其长期沉积记录》，于2018年5月14日从布里斯班启航，2018年5月21日返回霍巴特。本次过境航次的总体目标旨在解决以下三项研究议题：1. 塔斯曼尼亚东海岸水域有害藻华及其长期沉积记录；2. 海鸟分布与丰度的时空变化特征；3. Remote-ROAM移动建模海上试验。

本次航次采用Kongsberg EM122多波束测深仪（multibeam echosounder）采集布里斯班至霍巴特航线的海底测深与反向散射数据。该EM122测深仪的角分辨率为1°×1°，标称工作频率为12 kHz。

本数据集的原始数据存储于澳大利亚联邦科学与工业研究组织（CSIRO），其中水深与反向散射原始数据采用*.all格式存储，水柱反向散射数据采用*.wcd格式存储。本次数据集共计161个文件，总原始数据量达8.9 GB。

数据采集阶段已应用声速剖面进行校正。*.all格式存储的水深数据已完成运动校正与位置校正。本处理后数据未施加潮汐校正，且已移除异常值。处理后的航线数据以*.gsf与ASCII格式提供，处理后的水深与反向散射网格数据采用GeoTIFF格式发布。

本数据集的更多相关信息（包括处理流程说明）收录于GSM数据采集与处理报告。此外，可根据申请获取额外的数据产品。