http://bolin.su.se/data/jakobsson-2020-asko-1 Martin Jakobsson Bolin Centre Database 2020 Datafile Marine Bathymetry Multibeam bathymetry Stockholm archipelago RV Electra Groundwater Earth science > Oceans > Bathymetry/seafloor topography Martin Jakobsson 2020-01-02T11:28:29+00:00 English 1 None, but please cite Jakobsson et al. (2020) The bathymetric data is provided as a processed grid at a resolution of 1x1 m in reference to the SWEREF 99 18 00 projection. Data are available in one GeoTIFF (.tif) file (49.5 MB). The geoid model SWEN08_RH2000 has been used to convert the data to the vertical datum RH2000. The multibeam bathymetric data available as a processed grid were acquired between 2012 and 2018 during multiple surveys with RV Electra (24.3 m long) and RV Skidbladner (6.4 m long). A Kongsberg EM2040 0.4°x0.7°, 200-400 kHz, multibeam echo-sounder is hull mounted in RV Electra and RV Skidbladner has a pole-mounted Kongsberg EM2040 0.7°x0.7°, 200-400 kHz multibeam. Both RV Electra and RV Skidbladner receive position, heading and attitude data from Kongsberg-Seatex Seapath 330+ navigation units (GPS and GLONASS) with attached MRU5+ motion and reference sensors. Real-Time Kinematic (RTK) corrections were received from <a href="https://swepos.lantmateriet.se/">SWEPOS</a> over the internet. Positions have horizontal accuracies estimated to be better than ±5 cm and slightly coarser vertical accuracies. A Valeport MiniSVP sound velocity probe was used at discrete stations to acquire sound speed profiles. In addition, both RV Electra and RV Skidbladner have AML sound velocity probes mounted near the transducers for continuous reading of surface sound speed. The data were processed using <a href="https://www.qps.nl/">QPS Qimera</a> (version 1.7.2).