86bacba5-44b8-49e3-86a1-f3b62f351de4 English series series 2026-02-05T16:27:15 MEDIN 3.1.2 oceans Sound velocity and travel time in the water column SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Bathymetry and Elevation SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Post-Construction monitoring The Crown Estate Renewable Energy Development Phases 2012-05-15 revision Renewable Energy Lease area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision Hydrography GEMET - INSPIRE themes, version 1.0 2009-07-31 revision 1 2022-07-31T00:00:00 2022-10-16T00:00:00 1.13 1.45 52.95 53.316 1.90 29.06 TCE-3687 Marine Data Exchange 2022, XOCEAN, Dudgeon, Asset Integrity Survey Asset Integrity Survey 2022-10-16T00:00:00 creation 2025-05-30T08:17:49 publication 2023-10-26T00:00:00 revision English During June 2022 XOCEAN were asked by Reach Subsea AS to perform a full site survey on behalf of Equinor within the Dudgeon OWF. Data was acquired over the full area of the Dudgeon OWF and one export cable route. A single survey campaign was conducted from July 31st to October 16th 2022. The survey objective was to use a multibeam echosounder to collect suitable data coverage and density to identify any items larger than 0.5 m. - 1 m Digital Terrain Model (DTM). - Achieve a sounding density of 5 hits per 1 m cell. - Feature picking of objects greater than 0.5 metres. Once published, there will be no limitations on public access. Data must be used in accordance with the Marine Data Exchanges Terms of Use which can be found on the website. otherRestrictions Once published, there will be no constraints on access and use. Data must be used in accordance with the Marine Data Exchanges Terms of Use which can be found on the website. otherRestrictions The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk custodian XOCEAN Data Processor data.processor@xocean.com originator The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk distributor Reach Subsea post@reachsubsea.com owner notPlanned Delimited Text or Plaintext https://www.marinedataexchange.co.uk/details/TCE-3687/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site. Bathymetry 2025-11-27 revision This series has been Quality Assured so that it is compliant with the aforementioned MEDIN Guidelines and thus contains the mandatory components. In some instances, this compliance will not be feasible. True Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08T00:00:00 publication Conformity with the Commission Regulation (EU) No 1089/2010 was either not relevant to this dataset or not a requirement of the Marine Data Exchange for the creation and submission of this dataset ; therefore, conformity has not been assessed and cannot be declared True series 9.1. Online and Offline Quality Assurance The provided windfarm area was used as a base for the survey areas. The sounding density was monitored online in the NavAQ navigational/logging software to accurately meet the survey requirements. After completion of each of the survey areas the data was checked to ensure its quality. If grid nodes with low density were identified, supplementary infill survey lines were run. Hull-mounted Norbit Winghead MBES data was collected in NavAQ and stored in Raw *.bwx files. The Primary Reference Position (online) was provided by an Applanix POS MV system, augmented with Marinestar corrections in real time to establish a horizontal position accurate to less than 0.1 m, and a vertical position accurate to less than 0.15 m. The POS MV combines Global Navigation Satellite System (GNSS) and Inertial Measurement Unit (IMU) data into a tightly coupled integrated navigation solution. Preliminary coverage and data quality checks were made in Beamworx Autoclean software. Data download took place when the USV came back to port, via a Universal Serial Bus (USB) connection. The data was copied onto an external hard drive, and from there it was transferred to the XOCEAN storage servers for processing. The data is not deleted from the USV until the transfer to the servers has been verified. 9.2. MBES Data Processing Method and Quality Assurance A Post Processed Kinematic (PPK) solution was derived for the ship’s navigation using Applanix POSPac MMS (version 8.7) and the Trimble VRS-Now corrections. This uses GPS data logged online and high accuracy reference station based GNSS combined with wide-area coverage global satellite corrections. This network of stations can generate precise orbit, clock, and observation biases, which are transmitted to POSPac and used for tightly coupled inertial processing. This navigation solution was later applied to the sounding data in Autoclean. The data was reduced to MSL using the UKHO VORF MSL geoid model. The data was corrected with the observed sound velocity profiles to adjust for refraction effects. The sound velocity profiles and correlation with the MBES sound velocity sensor can be observed in Figure 11. The data was cleaned utilising the 95% confidence standard deviation layer and then quality checked for any spikes using the shallow, deep, and 3D view The Crown Estate Marine Data Advisor +44 020 7851 5000 enquiries@thecrownestate.co.uk pointOfContact EPSG Geodetic Parameter Registry 2022-12-12 revision WGS 84 / UTM zone 31N