Dataset: MSM14/1 - Simrad EM120 Data

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Archive unpublished
Dataset citation unpublished
Metadata of dataset ISO 19115/19139, FGDC
CruiseMSM14/1
Navigation system Merian - Seapath 200
Horizontal reference system (EPSG) WGS84 geographic (4326)
Sonar system Simrad EM120
Sonar type multibeam
Depth definition true depths
Depth datum (EPSG) MeanSeaLevel depth (5715)
File format Simrad multibeam processing format
File listing58 files, as XML file
Tracklength [km] 410
Generalised track ¹ KML file
Gross coverage [km²] (unedited - no warranty) 3936
Usage Primary data are generally not depth-edited and should not directly be used for final product compilations.
Maintenance Update frequency of dataset: notPlanned
Constraints Access: onDemand
Use: copyright
Status completed
Purpose The Eratosthenes Seamount area has been mapped in the past with multibeam bathymetry, but the data are not freely available in high resolution. Using the KONGSBERG EM120 multibeam echosounder of MARIA S. MERIAN, we started a new, detailed mapping survey of the seamount. Since the limited time did not allow for a complete coverage of the area, we decided to focus the survey on the deeper parts of the seamount with the option to sample the shallower areas during the next legs of cruise MSM 14.
Abstract During Cruise MSM04 the hull-mounted Kongsberg Simrad system EM120 was used for bathymetric mapping. The existing bathymetric maps of the study areas were complemented with the shipboard multibeam echosounder. CTD profiles of temperature, salinity and oxygen were used, in combination with the hull- mounted ADCP, to characterize the water masses and the current field. The EM120 system is a multibeam echosounder (with 191 beams) providing bathymetric mapping up to depths exceeding 11000 m. It operates on 11.25 to 12.6 kHz. A total of two multibeam tracks were performed. Due to the depth-dependent width of the swath, a regular (rectangular) survey grid over abrupt topography would result in gaps in the shallow areas and overlapping swaths in the deep parts. Instead, we choose a track following roughly the 2000 m and 1500 m contours, respectively (Fig. 5.5), and covering the lower slopes and the base of the seamount.
Sonar system operators B. Christiansen, F. Peine
(MaNIDA) data level 0
Data quality / Lineage
Point of contact MARUM bathymetry data responsible party
Aggregation


 (¹): KML file is created online from database applying track generalization ±50 meter.