8973b44c8fb3fc88259ec03f44ff265c 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_Backscatter_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 backscatter 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 Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2008-01-06 revision Acoustic backscatter in the water column SeaDataNet P021 parameter discovery vocabulary 2009-11-16 revision Not suitable for use in navigation otherRestrictions Not for public distribution English oceans 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 Datum = VORF LAT Vessel = MV Bibby Tethra Equipment = Kongsberg EM2040-04, 400kHz, multi-detect Gridded CUBE surface created in QPS Qimera 1.7.0-1.7.3. Bathymetry survey line files manually checked for standard deviation (2 sigma), prior to undergoing CUBE filtering. Features manually inspected/cleaned and hit counts checked. Data acquired using GNSS 'accurate heights' method and reduced using VORF LAT geoid-ellipsoid separation model. Backscatter mosaic tiles created from .GSF files, exported from Qimera clean database files and then imported in FMGT 7.8.4. Tiled mosaic created using FMGT's 0%-10% line blending, mosaicing style of 'Blend', filter type 'dB Mean', and subsequently reviewed for consistent acoustic normalisation between lines prior, to tile exports in FME. Gridded 0.25m x 0.25m mosaic tiles exported from QPS FMGT 7.8.4 for .FLT, .XYi and .TIFF. These exports imported into FME to create .OVR files, .PRJ files and STX files. Resolution of exported mosaics = 0.25m x 0.25m