0b66b1edfdc8905c5f88bf89addc9a99 English dataset Data Manager Gardline Geosurvey Limited Data Manager +44 (0)1493 845 600 +44 (0)1493 852 106 Endeavour House, Admiralty Road Great Yarmouth NR30 3NG geosurvey@gardline.com pointOfContact 2016-11-15 MEDIN Discovery metadata standard 2.3.8 urn:ogc:def:crs:EPSG::32630 GIS Shapefile of Bathymetry Contours (1 metre intervals) 2013-07-25 publication 2013-02-21 creation 2013-02-21 revision Gardline_9372 Processed from raw multibeam data, Gardline created 1 metre bathymetric contours as a shapefile for use on desktop GIS. For more information on the datasets, please refer to the Gardline report. Data Manager Gardline Geosurvey Limited Data Manager +44 (0)1493 845 600 +44 (0)1493 852 106 Endeavour House, Admiralty Road Great Yarmouth NR30 3NG geosurvey@gardline.com originator Data Manager Gardline Geosurvey Limited Data Manager +44 (0)1493 845 600 +44 (0)1493 852 106 Endeavour House, Admiralty Road Great Yarmouth NR30 3NG geosurvey@gardline.com custodian continual Database Marine Environmental Data and Information Network Elevation Geology Hydrography GEMET - INSPIRE themes, version 1.0 2008-01-06 revision Bathymetry and Elevation Geotechnics SeaDataNet P021 parameter discovery vocabulary 2009-11-16 revision Oceanographic geographical features INSPIRE THEMES 2011-02-16 creation Restricted public access otherRestrictions Restricted public access English elevation geoscientificInformation inlandWaters Charting Progress 2 Sea Areas 2009-06-18 creation Eastern Channel International Hydrographic Bureau, Limits of Oceans and Seas 1954-01-01 creation English Channel SeaDataNet vertical extent keywords 2010-01-01 revision soil and sediment ICES Statistical Areas 2014-05-16 creation VIId -0.3725 -0.0497 50.6121 50.8165 2012-11-20 2013-02-21 dataset For all surveys, after navigation was applied to the data, they were processed and interpreted using Geosoft Oasis Montaj. Quality Control checks were carried out on the data, before filters were applied to fit a background to the data set. When this is subtracted from the original magnetometer data, the residual or magnetic anomaly is left. This residual is gridded using the minimum curvature gridding method, and then the derivative grids are calculated to define the final Analytic Signal (AS) grid. This represents the gradient of an anomaly in nT/m. Oasis Montaj automatically picks targets from the AS grid, measuring the anomaly size by calculating the distance from the peak of an anomaly to its first inflection point. Magnetometer targets were reviewed in conjunction with the bathymetry and sidescan sonar data in order to identify any potential hazards at the seabed such as wrecks, boulders, debris, UXO and infrastructures. All anomalies were tabulated with location and anomaly amplitudes listed. These were subsequently given identification numbers and plotted on the seabed features chart and checked against sonar and swathe datasets.