268447f05f771ff96e4d23852cb96139 English dataset Ben Smith Bibby HydroMap Ltd CAD/GIS Technician Ben.Smith@bibbyhydromap.com pointOfContact 2018-11-27 MEDIN Discovery metadata standard 2.3.8 urn:ogc:def:crs:EPSG::25831 2018_023_HOW03_Lot8_Sample_B01_SSS_data 2018-11-16 publication 2018_023 Bibby HydroMap were commissioned in May 2018 by Orsted to carry out Geophysical and Benthic surveys at Horsea 03 Lots 5 and 8. The survey across the Lot 8 export route was completed under Bibby HydroMap's terms and conditions using MV Bibby Tethra, between 16th August and 3rd September 2018 with a 40m line spacing. The main objectives of the surveys were as follows: â?¢ Cable route engineering â?¢ Geo-hazard assessment â?¢ Consenting requirements o Identifying archaeological restrictions o Identifying protected ecological habitats â?¢ Planning of Geotechnical investigations â?¢ UXO clearance for Geotechnical investigations This dataset comprises of the SSS data across the survey area. Theo Gaussen Bibby HydroMap Ltd Senior Geophysicist dassh.enquiries@mba.ac.uk originator Theo Gaussen Bibby HydroMap Ltd Senior Geophysicist dassh.enquiries@mba.ac.uk custodian notPlanned Geographic Information System Marine Environmental Data and Information Network Geology Land cover GEMET - INSPIRE themes, version 1.0 2008-01-06 revision Side-scan sonar SeaDataNet P021 parameter discovery vocabulary 2009-11-16 revision Not suitable for use in navigation otherRestrictions Not for public distribution English geoscientificInformation imageryBaseMapsEarthCover 0.7557 1.1402 52.9341 53.1619 2018-08-16 2018-09-03 Theo Gaussen Bibby HydroMap Ltd Senior Geophysicist dassh.enquiries@mba.ac.uk distributor dataset Vertical Datum: Data not reduced to Datum Vessel: MV Bibby Tethra Equipment: Edgetech 4200 Side Scan Sonar 300/900kHz, Kongsberg 2040-04, 400kHz, multi-detect Software: SonarWiz, ArcGIS, Global Mapper Positional uncertainty: 0.09m average uncertainty for contacts, calculated from CUBE surface at 1m grid resolution. 3.00m for mosaic using offsets and map corrections Ping Rate: 13 Range: 60m Along Track Resolution: 0.15m Across Track Reolution: 0.01m Contact Listing Side scan sonar mosaic used to identify sonar contacts equal to or greater than 0.5m in any measurement. Bathymetry and Residual Mag grids used to aid interpretation of targets shape and determine their confidence interval according to the levels defined in the scope of work. Trackplots The raw *.cods are recorded in CODA DA4G. The raw xtfs are created using Sonar Wiz- *.cod files are imported into SonarWiz. Navigation and map offsets are applied to the data. This navigation information is exported out and injected into raw *.xtfs using NavInjectorPro. Xtfs were loaded in to Coda Survey Engine to export a trackplot report, which was formatted in ArcGIS. Line shp file includes positioning for every ping (ping rate 33.5pps) Point shp files includes a point every 200th ping" Navigation Processing summary Navigation files produced in QINSY and QINSy Validator. Applied to SSS files using NavInjectorPro and minor map corrections applied in SonarWiz if required. The final navigation files are exported out of SonarWiz Mosaic Mosaic resolution: 0.1 mpp / 1 mpp Background Value: No data value is white and was set to transparent during clipping and exporting in Global Mapper HF/LF Mosaic: *.cod files are imported into SonarWiz. Navigation and map corrections and offsets are applied to the data. EGN gain table is built and applied to the data. The files order is optimised for cover up. No average or shine through is used. The mosaic is then exported and then clipped to survey boundary and tiled in Global Mapper SBF Processing Summary: Side scan sonar mosaic and bathymetric XYZ are used to identify and measure the heights, wavelength and orientation of any seabed morphology. Side scan sonar and backscatter is used to identify the classification of the seabed sediments.