Dataset: MSM14/1 - Simrad EM120 Data | HOME Imprint |
Archive | unpublished |
Dataset citation | unpublished |
Metadata of dataset | ISO 19115/19139, FGDC |
Cruise | MSM14/1 |
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 listing | 58 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.