Citation:

bg-17-1463-2020

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Abstract:

The latest expedition to the DISCOL experimental area (DEA, www.discol.de) was conducted in 2015 during cruise SO242 with the German RV SONNE. The entire disturbance area was extensively mapped with the ship-mounted Multibeam Echosound (MBES) System. An AUV has been deployed several times in different modes for the acquisition of high resolution MBES, Side Scan Sonar (SSS) and optical data. Even with state-of-the-art positioning technology the remaining navigation uncertainties in the deep sea and the use of a variety of acoustical and optical sensors at different resolutions require detailed post-processing in terms of absolute geographic positioning to improve the overall accuracy of the data. The ship-based bathymetric map of the survey area was used as absolute geographic reference and the AUV-acquired high resolution-data sets available here were geo-referenced and aligned to each other (see the respective assigned PANGEA-links for the different data sets and Gausepohl et al., in review, for details) resulting in the most accurate geo-referenced dataset of the DEA to date.

The plough tracks from the disturbance experiment in the DEA in 1989 are visible in all of the acquired high resolution data sets, which enabled digitizing, geo-referencing and age-sequencing of the disturbance tracks (Gausepohl et al., in review).

This dataset includes the gridded MBES data from the Kongsberg EM122 mounted in RV SONNE (https://doi.pangaea.de/10.1594/PANGAEA.905579) and the geo-referenced AUV ABYSS-acquired MBES (https://doi.pangaea.de/10.1594/PANGAEA.905580) and SSS (https://doi.pangaea.de/10.1594/PANGAEA.905617) datasets. Furthermore it includes two georeferenced photo mosaics generated from two AUV photo transects (https://doi.pangaea.de/10.1594/PANGAEA.905581). The identified, digitized and georeferenced plough marks are available as GIS-readable shape files here. We further provide the Matrix that was used for the age succession evaluation of the plough marks (Gausepohl et al., in review) in .xlsx and .csv format.

Further details:

DISCOL Disturbance Tracks Age Determination Matrix [dataset]. DISCOL_Disturbance-Tracks_Age-Determination_Matrix.zip

Georeferenced plough marks as shape files [dataset]. Plough_Marks.zip

Project(s):

JPI Oceans - Ecological Aspects of Deep-Sea Mining (JPIO-MiningImpact)

Coverage:

Median Latitude: -7.073648 * Median Longitude: -88.439364 * South-bound Latitude: -7.118867 * West-bound Longitude: -88.515550 * North-bound Latitude: -6.984767 * East-bound Longitude: -88.332533

Date/Time Start: 2015-07-31T08:29:00 * Date/Time End: 2015-08-17T14:53:00

Change history:

2020-07-22T12:16:54 – corrected version of georeferenced plough marks as shape files (further details)

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)