Dataset: MSM16/3 - Simrad EM120 Data
Imprint
| HOME Imprint |
| Archive | DOI |
| Dataset citation | HTML, BibTeX, RIS |
| Metadata of dataset | ISO 19115/19139, FGDC, PANGAEA |
| Cruise | MSM16/3 |
| 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 | 149 files, as XML file |
| Tracklength [km] | 693 |
| Generalised track ¹ | KML file |
| Gross coverage [km²] (unedited - no warranty) | 1077 |
| 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 | |
| Abstract | In water depths beyond 800 m the hull-mounted deep-water system EM120 was used. The EM120 system allows an accurate bathymetric mapping up to full ocean depth. Basic components of the system are two linear transducer arrays in a Mills cross configuration with separate units for trans-mitting and receiving. Using the waytravel-time and the beam angle known for each beam, and taking into account the ray bending due to refraction in the water column by sound speed variations, depth is calculated for each beam. A combination of amplitude (for the central beams) and phase (slant beams) is used to provide accuracy practically independent of the beam-pointing angle. Aside from depth values, the EM120 also provides backscatter values and pseudo side-scan images. |
| Sonar system operators | S. Schilling |
| (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.