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Found 57 results.

Multibeam bathymetry processed data (NORBIT WBMS entire dataset) from 2021, Laacher See, Germany

This dataset contains processed bathymetric data of the volcanic crater lake Laacher See in Germany recorded on 13-14 September 2021, acquired for the purpose of describing the lake sedimentary infill and volcanic degassing processes occurring in the crater. It has a coverage of 2.81 km², which corresponds to ca. 84% of the total lake surface area. The nearshore zone was not mapped due to vegetation growth limiting the data quality. Depths are expressed in meters below lake level, ranging from 2.4 m to 50.5 m. The bathymetric data was acquired using a Norbit WBMSe Wideband Multibeam Sonar from the Flanders Marine Institute (Vlaams Instituut voor de Zee, VLIZ) and the system was operated at a source frequency of 400 kHz with a maximum swath angle of 150°, transmitting 512 beams with a beam width of 0.9° x 1.9°. Sound velocity profiles were collected throughout the survey to account for temporal variations in water-column sound velocity. Processing of the raw data was done using Qimera 2.5.1 (QPS) and included correction for pitch, roll and heading offsets during acquisition, and manual removal of artefacts such as gas bubbles, vegetation and inconsistent soundings in overlapping swaths. From the processed data, a bathymetric grid with a ~1m cell size was constructed.

Water column raw data (Kongsberg EM712 entire dataset) of RV MARIA S. MERIAN during cruise MSM128

Raw water column data were collected aboard RV MARIA S. MERIAN during the cruise MSM128 (TRAPA) using a 40-100kHz Kongsberg EM 712 multibeam echosounder. The expedition took place during 02.05.2024 – 20.05.2024 from Emden to Rostock (Germany) in the North Sea. The main aim of MSM128 (TRAPA) was to reconstruct the Late Pleistocene and Early Holocene landscape in the present day North Sea area north of Helgoland that was once extensively exploited by Late Palaeolithic hunter-gatherer groups. Data were recorded inside the German EEZ. Sound velocity profiles (SVP) were applied on the data for calibration. Please see environmental data and the cruise report for details. The data are unprocessed and can therefore contain incorrect depth measurements (artifacts) if not further processed. Note that refraction errors may occur when no proper SVP is applied. Data acquisition was done by CAU Kiel. Data provision is supported by the DAM Underway Project and is according to the FAIR principles.

Sound velocity profiles (AML-3 LGR entire dataset) of SV DVOCEAN, Rhine River, Germany

This dataset comprises the sound velocity profiles (.csv) which were collected along a high-resolution multibeam echosounder (MBES) bathymetry and backscatter survey campaign in a 7.5 km segment of the River Rhine (km 747.0–754.5, Düsseldorf, Germany) between July 24th and 31st, 2024. The survey, conducted with a Kongsberg EM2040P MKII multibeam echosounder operated at a frequency of 300 kHz, achieved a point density of ≥ 160 points/m² and met the IHO Special Order standards (horizontal uncertainty ≤ 15 cm, vertical uncertainty ≤ 3 cm). The dataset comprises the raw sound velocity profiles which were collected with an AML-3 LGR device from AML Oceanographic. The sound velocity profiles were taken every 4 hours. Since the probe can be equipped with three sensors simultaneously, the provided files to not only contain the measured sound velocity values at the respective depths, but also turbidity and pressure information for each record. The collected profiles were directly imported to the multibeam acquisition software. During the import process, the profile was reviewed, outliers were removed and the measured profile was applied to be recognized for the multibeam data acquisition. However, the provided files refer to the raw data which means that outliers etc. are still present and must be removed before applied to hydrographic surveys to ensure a refraction correction and thus accurate depth information.

Multibeam bathymetry processed data (Kongsberg EM2040P MKII entire dataset, Generic sensor format) of SV DVOCEAN, Rhine River, Germany

This dataset comprises high-resolution multibeam echosounder (MBES) data collected in a 7.5 km segment of the River Rhine (km 747.0–754.5, Düsseldorf, Germany) between July 24th and 31st, 2024. The survey, conducted with a Kongsberg EM2040P MKII multibeam echosounder operated at a frequency of 300 kHz, achieved a point density of ≥ 160 points/m² and met the IHO Special Order standards (horizontal uncertainty ≤ 15 cm, vertical uncertainty ≤ 3 cm). The dataset comprises filtered and cleaned data which was exported in QPS Qimera as .gsf files. Those files can be used for backscatter processing in i.e. QPS FMGT. Since the survey area is characterized by the occurrence of boulders, the data are suited for hazard mapping, geomorphological studies and AI/ML model training (e.g., semantic segmentation of the boulders).

Annotated boulder occurrence dataset using quartzite block detection derived from multibeam bathymetry processed data (Kongsberg EM2040P MKII) of SV DVOCEAN, Rhine River, Germany

This dataset comprises annotated boulders within were manually digitized within a high-resolution multibeam echosounder (MBES) dataset. The entire multibeam echosounder survey campaign covers a 7.5 km long segment of the River Rhine (km 747.0–754.5, Düsseldorf, Germany) and the data acquisition was conducted between July 24th and 31st, 2024. The survey, conducted with a Kongsberg EM2040P MKII multibeam echosounder operated at a frequency of 300 kHz, achieved a point density of ≥ 160 points/m² and met the IHO Special Order standards (horizontal uncertainty ≤ 15 cm, vertical uncertainty ≤ 3 cm). Since the survey area is characterized by the occurrence of boulders, a manual annotation of those boulders was carried out for each 500 m section of the survey area. An overall annotation consistency was supported by applying common interpretation criteria and by cross-referencing potential boulders within the bathymetry, hillshade and backscatter datasets during the digitization. Thus, characteristic indicators of quartzite blocks, including elevated bathymetric structures, high backscatter intensity and associated morphological features such as scour marks, were jointly assessed. Subsequently, the provided dataset comprises the 2053 manually digitized polygon annotations as .shp file as well as their diameter, position, shape area, highest point and height in a .csv file. The data are suited for AI/ML model training (e.g., semantic segmentation) as well as the validation of automated boulder detection methods.

Multibeam bathymetry raw data (Kongsberg EM712 entire dataset) of RV MARIA S. MERIAN during cruise MSM99

Multibeam bathymetry raw data using the ship's own Kongsberg EM 712 multibeam echosounder was not continuously recorded during RV MARIA S. MERIAN cruise MSM99. Data was recorded on 16 days between 2021-02-26 and 2021-03-19. This dataset contains 13x survey lines (occasionally with some line crossing perpendicular to the track) in the Baltic Sea and Gulf of Bothnia. The approximate average depth of the entire dataset is around 150m, ranging from 280m to 22m. No ancillary sound velocity profiles (SVP) files from the cruise are added to this dataset. Data analysis of the multibeam raw data revealed that SVP has been changed several during the survey. This publication is conducted within the efforts of the German Marine Research Alliance in the core area 'Data management and Digitalization' (Deutsche Allianz Meeresforschung, DAM). Data are unprocessed and therefore contains incorrect depth measurements (artifacts) without further processing. Note that refraction errors can be expected due to the lack of proper SVP. Overall, it appears that the data quality is rather good since the gridded hillshade data showed relatively few obstacles. Data can be processed e.g. with the open source software package MB-System (Caress et al. 2024, https://doi.org/10.5281/zenodo.6302801).

Multibeam bathymetry raw data (Atlas Hydrosweep DS 3 echo sounder entire dataset) of RV POLARSTERN during cruise PS151

Multibeam data were collected with RV Polarstern along the route of cruise PS151 and data acquisition was almost continuously monitored during the survey. Multibeam sonar system was Teledyne/Atlas Hydrosweep DS3. SVPs were retrieved from CTD data and synthetic profiles from World Ocean Atlas 23. SVPs were processed with HydrOffice SoundSpeedManager (https://www.hydroffice.org/soundspeed/main) and extended with World Ocean Atlas 23 (https://www.ncei.noaa.gov/archive/accession/NCEI-WOA23). SVP data were applied during acquisition. Multibeam data are unprocessed and may contain outliers and blunders and should not be used for grid calculations and charting projects without further editing. The raw multibeam sonar data in Teledyne Reson multibeam processing format (.s7k) were recorded with Teledyne PDS software. Raw data files can be processed using software packages like CARIS HIPS/SIPS. For updated vessel configuration files check further details.

Multibeam bathymetry processed data (Kongsberg EM 2040 working area dataset) of RV ALKOR during cruise AL628, east of Little Belt, Baltic Sea

Multibeam bathymetry processed data (EM 2040 multibeam echosounder) of RV ALKOR during cruise AL628 in the Baltic Sea. The raw data (.kmall) were processed using QPS Qimera software (v 2.6), based on the following workflow: 0.Raw data > 1.Apply correct Sound Velocity Profiles -> 2.Create dynamic surface (shallow Mode) -> 3.Apply Spline Filter (Medium/Strong) > 4. Finalize with manual 2D and 3D editing, -> 5.Export in GeoTIFF format and projected in the UTM32N coordinate system (EPSG:32632). The produced rasters are named AL628_EM2040_'working area'_'resolution in cm'. The bathymetry dataset here is gridded at 0.25 m and 0.50 m resolution. The data products were created in the context of the DAM (German Marine Research Alliance), CONMAR research project.

Munition pile inventory in the German Baltic Sea, 2017 to 2024

The dataset is a spreadsheet of munition piles, their properties (e.g., number of objects, variability, burial state), and the parameters characterizing their environmental (e.g., munition compound concentrations and current velocity) and maritime (e.g., distance to various maritime uses and traffic density) surroundings in the German Baltic Sea. Data were collected over numerous cruises from 2017 to 2024. All munition piles in the dataset are located at Kolberger Heide (close to Kiel Fjord) or in the Lübeck Bay. The purpose of data acquisition was to understand the distribution and properties of dumped munitions in German waters as well as the hazards and risks they pose to maritime uses. Munition piles were annotated in multibeam echosounder data, assessed in detail in photomosaics, and analyzed using an array of geospatial analysis methods.

Multibeam bathymetry processed data (EM 1002 echosounder entire dataset) of RV MARIA S. MERIAN during cruise MSM32

Bathymetry data was acquired during R/V MARIA S. MERIAN cruise MSM32 in the northeastern Atlantic between 25.09.2013 and 30.10.2013. The cruise aimed to gain a better understanding of the Agadir Canyon. To investigate why some submarine landslides remain as coherent blocks of sediment throughout their passage downslope, while others mix and disintegrate almost immediately after initial failure MSM32 combined seismic, hydroacoustic and sidescan surveys [DOI: 10.2312/cr_msm32]. CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval. During the MSM32 cruise, the moonpooled KONGSBERG EM1002 multibeam echosounder (MBES) was utilized to perform bathymetric mapping in shallow depths. 111 beams are formed for each ping while the seafloor is detected using amplitude and phase information for each beam sounding. For further information on the system, consult https://www.km.kongsberg.com/. During the cruise, the swath width was adjusted manually to get the best compromise between coverage and data quality with changing water depth and sea state [DOI: 10.2312/cr_msm32]. Responsible person during this cruise / PI: P. Feldens. Postprocessing and products were conducted by the Seafloor-Imaging & Mapping group of MARUM/FB5, responsible person Paul Wintersteller (seafloor-imaging@marum.de). The open source software MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, https://www.mbari.org/products/research-software/mb-system, 2017) was utilized for this purpose. A sound velocity correction profile was applied to the MSM32 data; there were no further corrections for roll, pitch and heave applied during postprocessing. A tide correction was applied, based on the Oregon State University (OSU) tidal prediction software (OTPS) that is retrievable through MB-System. CTD measurements during the cruise were sufficient to represent the changes in the sound velocity throughout the study area. Using Mbeditviz, artefacts were cleaned manually. NetCDF (GMT) grids of the edited data as well as statistics were created with mbgrid. The published bathymetric EM1002 grid of the cruise MSM32 has a resolution of 35 m. No total propagated uncertainty (TPU) has been calculated to gather vertical or horizontal accuracy. A higher resolution is, at least partly, achievable. The grid extended with _num represents a raster dataset with the statistical number of beams/depths taken into account to create the depth of the cell. The extended _sd -grid contains the standard deviation for each cell. The DTMs projections are given in Geographic coordinate system Lat/Lon; Geodetic Datum: WGS84.

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