Raw multibeam bathymetry data from the Kongsberg EM712 was acquired during the RV Heincke cruise HE659 in the German Bight in April 2025. The data was generally acquired during calm seas in water depths between 20 and 50 m. Primarily three different regions were surveyed (Borkumer Reef Ground, Sylt Outer Reef, and Helgoland). Generally the data is comprehensive and overlapping swaths creating a continuous bathymetry were archived. In some areas the data was acquired complementary to sidescan sonar surveys and individual tracks do not overlap. Data are unprocessed and therefore may contain some incorrect depth measurements (artifacts) without further processing. No tide variations are applied. Sound velocity profiles were acquired regularly. Overall, it appears that the data quality is rather good. The gridded data showed relatively few obstacles.
Multibeam snippet raw data were recorded using a Norbit STX WBMS multibeam echosounder mounted to the side of the 6.5 m-long aluminum catamaran KLAASHAHN. Data were recorded using frequencies200, 400, 550 and 700 kHz. Files are stored in the s7k-format, and sorted by date of acquisition and frequency. The 200 and 400 kHz frequency data were manufacturer-calibrated. Correct absorption values have been applied during the export. Data can be processed, e.g., with the open source software package MB-System (Caress, D.W., and D.N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2021). No SVP files exist, due to the low water depths (4-7 m), the values of the inbuild sound velocity sensor can be used throughout the water column. The investigation site was located in the Southern Baltic Sea close to the city of Rostock (Germany) and includes three habitat types: seagrass meadows, a mussel covered reef, and coarse sand and gravel areas. Distance to the shoreline was 500 to 1000 m, and water depth varied between 4.5 and 6.5 m.
Multibeam snippet raw data were recorded using a Norbit STX WBMS multibeam echosounder mounted to the side of the 6.5 m-long aluminum catamaran KLAASHAHN. Data were recorded using frequencies 200, 400, 550 and 700 kHz. Files are stored in the s7k-format, and sorted by date of acquisition and frequency. The 200 and 400 kHz frequency data were manufacturer-calibrated. Correct absorption values have been applied during the export. Data can be processed, e.g., with the open source software package MB-System (Caress, D.W., and D.N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2021). No SVP files exist, due to the low water depths (4-7 m), the values of the inbuild sound velocity sensor can be used throughout the water column. The investigation site was located in the Southern Baltic Sea close to the city of Rostock (Germany) and includes three habitat types: seagrass meadows, a mussel covered reef, and coarse sand and gravel areas. Distance to the shoreline was 500 to 1000 m, and water depth varied between 4.5 and 6.5 m.
Multibeam snippet raw data were recorded using a Norbit STX WBMS multibeam echosounder mounted to the side of the 6.5 m-long aluminum catamaran KLAASHAHN. Data were recorded using different frequencies in three months in 2019: May (200, 400 kHz), August (200, 400, 550, 700 kHz), and October (200, 400, 550, 700 kHz). Files are stored in the s7k-format, and sorted by date of acquisition and frequency. The 200 and 400 kHz frequency data were manufacturer-calibrated. Correct absorption values have been applied during the export. Data can be processed, e.g., with the open source software package MB-System (Caress, D.W., and D.N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2021). The investigation site was located in the Southern Baltic Sea close to the city of Rostock (Germany) and includes three habitat types: seagrass meadows, a mussel covered reef, and coarse sand and gravel areas. Distance to the shoreline was 500 to 1000 m, and water depth varied between 4.5 and 6.5 m. The same area (500 x 500 m) was covered at all times, but profile direction (N-S or E-W) was adapted to weather conditions. Acoustic backscatter strength can be used to identify the seafloor composition. The aim of this study was to investigate the impact of seasonal habitat changes on backscatter strength of different frequencies.
Multibeam snippet raw data were recorded using a Norbit STX WBMS multibeam echosounder mounted to the side of the 6.5 m-long aluminum catamaran KLAASHAHN. Data were recorded using frequencies 200 and 400 kHz. Files are stored in the s7k-format, and sorted by date of acquisition and frequency. The 200 and 400 kHz frequency data were manufacturer-calibrated. Correct absorption values have been applied during the export. Data can be processed, e.g., with the open source software package MB-System (Caress, D.W., and D.N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2021). No SVP files exist, due to the low water depths (4-7 m), the values of the inbuild sound velocity sensor can be used throughout the water column. The investigation site was located in the Southern Baltic Sea close to the city of Rostock (Germany) and includes three habitat types: seagrass meadows, a mussel covered reef, and coarse sand and gravel areas. Distance to the shoreline was 500 to 1000 m, and water depth varied between 4.5 and 6.5 m.