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RV Investigator Voyage IN2021_E01 EM122 Multibeam Echosounder Data

Created 25/06/2025

Updated 25/06/2025

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This record describes multibeam echosounder data collected on RV Investigator voyage IN2021_E01 (Trials and Calibration) which departed Hobart on the 10th November 2021 and returned to Hobart on the 14th November 2021. The purpose of this voyage was to undertake post port-period equipment calibrations and commissioning, sea trials and personnel training. The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter in Storm Bay and offshore to the southeast of Tasman Peninsula. The EM122 provides a 1 degree by 1 degree angular resolution. The echosounder's nominal frequency is 12 kHz. A patch test calibration was performed to determine the angular offsets of the system. Data are stored in .all raw format for bathymetry and backscatter and .wcd format for watercolumn backscatter at CSIRO. There are 39 files totalling 1.31 GB of raw bathymetry (.all) data and 39 files totalling 1.82 GB of raw watercolum (.wcd) 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 corrections were applied to the processed data using the EGM2008 model (EGM_2008_1Min_Aust_WGS84.csar). 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.

Files and APIs

Additional Info

Field Value
Title RV Investigator Voyage IN2021_E01 EM122 Multibeam Echosounder Data
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/2b7654b8-e0b0-4072-ba0e-17621a194ece
Contact Point
CSIRO Marlin Data Catalogue
NCMIGeophysicalSurveyMapping@csiro.au
Reference Period 08/12/2021
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        147.35,
        -43.59
      ],
      [
        148.72,
        -43.59
      ],
      [
        148.72,
        -42.89
      ],
      [
        147.35,
        -42.89
      ],
      [
        147.35,
        -43.59
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal CSIRO Marlin

Data Source

This dataset was originally found on CSIRO Marlin "RV Investigator Voyage IN2021_E01 EM122 Multibeam Echosounder Data". Please visit the source to access the original metadata of the dataset:
https://marlin.csiro.au/geonetwork/srv/eng/csw/dataset/rv-investigator-voyage-in2021_e01-em122-multibeam-echosounder-data