981acf7d1e90a8d7eb0235a252c37251
English
dataset
David Gordon
Gardline Limited
Principle Client Reporting Manager
dassh.enquiries@mba.ac.uk
pointOfContact
2018-10-10
MEDIN Discovery metadata standard
2.3.8
urn:ogc:def:crs:EPSG::4258
11209 HOW03 GP1B Lot 4 Geophysical UHR Survey 2018 - SSS
2018-09-19
publication
11209
Wind Farm Identifier: HOW03 LOT4; Survey Details: Geophysical 1b pre-geotechnical UXO survey acquiring magnetometer array, bathymetry, side scan sonar, sub bottom profiler, ultra-high resolution multichannel seismic and environmental grab sample data across wind farm and along export cable corridor. Acquired by Gardline Limited. Geophysical Acquisition Dates 2018-05-01 to 2018-09-07. Projection: Horizontal datum: ETRS89 (2018.0) Ellipsoid name: GRS 1980 Coordinate system: UTM 31N Vertical Datum LAT
David Gordon
Gardline Limited
Principle Client Reporting Manager
dassh.enquiries@mba.ac.uk
originator
David Gordon
Gardline Limited
Principle Client Reporting Manager
dassh.enquiries@mba.ac.uk
custodian
continual
Marine Environmental Data and Information Network
Elevation
Hydrography
GEMET - INSPIRE themes, version 1.0
2008-01-06
revision
Bathymetry and Elevation
SeaDataNet P021 parameter discovery vocabulary
2009-11-16
revision
Use of this data requires approval from Orsted
otherRestrictions
Use of this data requires approval from Orsted
English
elevation
inlandWaters
2.2100
2.7900
53.6900
54.0000
2018-05-01
2018-09-07
26.9800
72.9100
David Gordon
Gardline Limited
Principle Client Reporting Manager
dassh.enquiries@mba.ac.uk
distributor
dataset
Raw sidescan sonar XTF and JSF, low frequency (300kHz), medium frequency (600kHz) and high frequency (900kHz), Vessel: M.V. Ocean Endeavour. Equipment Type: Edgetech Side Scan Sonar FS4200 600/300kHz and 900/300kHz. Ping Rate: 10 per second for 600/300kHz and 30 per second for 900/300kHz. Range Setting: 80m for 600/300kHz and 25m for 900/300kHz. Data Resolution Along Track: 0.4m for 600/300kHz and 0.1m for 900/300kHz. Data Resolution Across Track: 0.03m for 300kHz, 0.015m for 600kHz and 0.01m for 900kHz. All USBL navigation has been processed using Gardline in-house Voyager5 software. Data processing has not been carried out on this dataset. Heading corrections were carried out using Gardline in-house Geofusion software using a rolling heading based on course over ground with further manual adjustments as required. Data was recorded in both jsf and xtf format using Edgetech Discover software Version 33.0.1.109. Deliverable created using: Gardline in-house Geofusion software. Total Positional Uncertainty derived from the USBL data - 0.4% at 1DRMS.
Sidescan Sonar Navigation File, Vessel: M.V. Ocean Endeavour Equipment Type: Edgetech 4200 Sonar Fish and Sonardyne Ranger USBL System. Navigation Data Processing were carried out using Voyager5 and deliverables were created using Gardline in House Voyager5 Software. USBL data were processed and raw data were opened in Voyager5 and manually checked and corrected for any spikes or erroneous points. Once data cleaning has been carried out a light smooth filter of 11 points was added to the data which was then exported in a cnv format. Total Positional Uncertainty derived from the USBL data - 0.4% at 1DRMS.
Sidescan Sonar Mosaic, high frequency (600kHz) and low frequency (300kHz), Vessel: M.V. Ocean Endeavour Equipment Type: Edgetech Side Scan Sonar FS4200 600/300kHz. All USBL navigation has been processed using Gardline in-house Voyager5 software. Data has been cleaned and a smooth filter applied to the track. Data processing has been carried out using Gardline in-house Geofusion software. Raw XTF files are read in, corrected navigation is applied, the seabed is tracked, TVG's are applied and data is mosaiced using the cover-up method. Targets are then compared with final bathymetry. Total Positional uncertainty calculated from the USBL data is 0.4% 1DRMS although additional uncertainties are introduced due to the variable nature of the actual sonar fish heading. Data Resolution: 10cm and 1.0m. Along Track Resolution - 0.1m, Across Track Resolution - 0.01m. Background Value: 255,255,255.
Seafloor Contact List Combined and Cross Correlated Between SSS, Backscatter and MBES Datasets. Vessel: M.V. Ocean Endeavour. Equipment Type: Fugro Starpack Navigation Package Kongsberg Simrad EM2040D Multi-Beam Echosounder, Edgetech FS4200 300/600kHz, 300/900kHz Side scan sonar and Geometrics G882 magnetometer. Data Processing carried out using Blue Marble Geophysicsâ?? Global Mapper, Geosoftâ??s Oasis Montaj and Gardline in-house Geofusion. Total Positional Uncertainty derived from the Fugro Starpack Navigation System - 0.1m. The minimum thresholds for target analysis were 2nT for magnetometer data and 0.1m in any dimension for side scan sonar data. A confidence scale has been applied based on the number of data sets each target has been seen on: 1 - identified on one data file from one sensor only, 2 â?? Identified on multiple data files from the same sensor, contacts too dense to reconcile individual objects, 3 â?? Identified on multiple data files from one sensor only â?? position reconciled between files, 4 - Identified on data files from multiple sensors â?? position reconciled between files, 5 â?? Position and interpretation verified with background information i.e. a target identified on MBES, SSS and MAG datasets will have a confidence interval of 3. Each dataset was reviewed individually for targets which were then all loaded into Global Mapper along with the DTM, sonar mosaics, and magnetometer grids to asses which targets related to one another. Where targets we identified on different systems they were resolved to a single target, but the information from the other datasets was retained, i.e. an object identified on both MBES data and side scan sonar data will use the MBES position, but the dimensions from the sonar data. Contacts are classified as boulder unless there is an associated magnetic anomaly, in which case the contact is classified as debris. Where there is uncertainty as to the classification of a contact, it is classified as an unknown target. Contacts associated with known infrastructure will be classified as their known name. Other classifications will include wreck and fishing equipment/pots.
Contact images JPG and GeoTIF. Vessel: M.V. Ocean Endeavour. Equipment Type: Fugro Starpack Navigation Package, Edgetech FS4200 300/600kHz, 300/900kHz Side scan sonar and Sonardyne Ranger USBL System. Side scan sonar data were interpreted using Gardline's Geofusion software for potential seabed contacts and where present PDFs produced. Total Positional Uncertainty derived from the Ranger 2 USBL System 0.4% 1DRMS. The minimum thresholds for target analysis were 2nT for magnetometer data and 0.1m in any dimension for side scan sonar data. A confidence scale has been applied based on the number of data sets each target has been seen on: 1 - identified on one data file from one sensor only, 2 â?? Identified on multiple data files from the same sensor, contacts too dense to reconcile individual objects, 3 â?? Identified on multiple data files from one sensor only â?? position reconciled between files, 4 - Identified on data files from multiple sensors â?? position reconciled between files, 5 â?? Position and interpretation verified with background information i.e. a target identified on MBES, SSS and MAG datasets will have a confidence interval of 3. Contacts are classified as boulder unless there is an associated magnetic anomaly, in which case the contact is classified as debris. Where there is uncertainty as to the classification of a contact, it is classified as an unknown target. Contacts associated with known infrastructure will be classified as their known name. Other classifications will include wreck and fishing equipment/pots. Each dataset was reviewed individually for targets which were then all loaded into Global Mapper along with the DTM, sonar mosaics, and magnetometer grids to assess which targets related to one another. Where targets we identified on different systems they were resolved to a single target, but the information from the other datasets was retained, i.e. an object identified on both MBES data and side scan sonar data will use the MBES position, but the dimensions from the sonar data. An image of the sonar data is then exported as a JPG image at a resolution of 0.1m, this is centred on the position of the target on the side scan sonar data rather than the MBES position.