Identification

Title

British Geological Survey (BGS) Geophysical and Multibeam Survey 2005/4: Summer Isles / East Minch (04/Jul/2005 to 23/Jul/2005)

Alternative title(s)

Summer Isles

Abstract

This British Geological Survey (BGS) marine geophysical and multibeam survey took place in July 2005 in the Summer Isles region and Loch Broom and Little Loch Broom aboard the RV Calanus. The survey was a part of the BGS Offshore Mapping and Modelling Project, North Atlantic Correlation. Subsurface seismic data were gathered using a Surface Tow Boomer. Multibeam bathymetry data was collected using a Geoacoustics GeoSwath system supplied and operated by Fathoms Ltd. All of the data were recorded digitally, but paper records were generated also. The data are archived by BGS. Backscatter and geophysical data are available for download. Technical details of the survey are contained in BGS Report IR/05/139 (http://nora.nerc.ac.uk/id/eprint/11140/). GeoIndex Offshore - https://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=2005/4&.

Resource type

dataset

Resource locator

http://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=2005/4

protocol: HTTP

name: BGS Offshore Geoindex

description: GeoIndex allows users to search for information about BGS data collections covering the UK and other areas world wide. Access is free, the interface is easy to use, and it has been developed to enable users to check coverage of different types of data and find out some background information about the data. More detailed information can be obtained by further enquiry through the website.

function: search

Unique resource identifier

code

BGS_CMD_REF311

codeSpace

British Geological Survey

Dataset language

eng

Spatial reference system

authority code

OGP

code identifying the spatial reference system

urn:ogc:def:crs:EPSG::4326

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

revision

effective date

2010-05-18

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

revision

effective date

2011-07-27

Geographic location

West bounding longitude

-5.7294

East bounding longitude

-5.0587

North bounding latitude

58.0865

South bounding latitude

57.8194

Extent

Extent group

authority code

title

reference date

date type

revision

effective date

2024-04-11

code identifying the extent

Great Glen

Extent group

authority code

title

reference date

date type

revision

effective date

2024-04-11

code identifying the extent

Sutherland

Extent group

authority code

title

reference date

date type

creation

effective date

2009-06-18

code identifying the extent

Minches & Western Scotland

Extent group

authority code

title

reference date

date type

creation

effective date

1954-01-01

code identifying the extent

INNER SEAS OFF THE WEST COAST OF SCOTLAND

Temporal reference

Temporal extent

Begin position

2005-07-04

End position

2005-07-23

Dataset reference date

date type

publication

effective date

2005-07-23

Frequency of update

notPlanned

Quality and validity

Lineage

Geophysical equipment types used included: Surface Tow Boomer. The survey was undertaken by British Geological Survey. NAVIGATION: Differential GPS, all position data are referred to the WGS 84 datum. For the swath bathymetry survey the DGPS receiver was supplied by Fathoms and input directly to the Geoswath system. For the surface tow boomer operations the ship’s DGPS system was used. SURFACE TOW BOOMER:Source: EG&G plate in Applied Acoustics catamaran. High Voltage Power Supply: 2 x Applied Acoustic Engineering CSP3000 capacitor charging units, (1 plus a spare). This unit was powered from the ship’s mains and with a switchable output up to a maximum of 2.2 KJ, maximum used for the S.T.Boomer was 300J at a repetition interval of 0.3 seconds. Hydrophone: 2 x Teledyne, 10 m, 7 channels with all summed to give a single output, (1 plus a spare). The summing amplifier used was a newly developed BGS unit, which also included low pass and anti-alias filters. The new unit proved to be significantly less noisy than the previous version, a feature which was particularly noticeable in deep water when very high gain levels were required. Recording: CODA DA200 four channel digital recording and processing system, with the data being recorded on harddisk in CODA format and backup to Exabyte tape in both SEGY and CODA formats. The data were recorded with a sampling frequency of 12kHz, record length of 200mseconds and a bandpass filter of 450-4500Hz. The start of recording was delayed in deep water to maximise the usable data record below the sea bed. Position was recorded with every shot. On-line processing: CODA system. SWATH BATHYMETRY: Geoacoustics GeoSwath system, contractor Fathoms Ltd. A TSS DMS25 Motion Sensor, a mini-SV probe and a Tritech single beam echosounder, to measure the depth directly below the transducers, were all mounted in the transducer head assembly. Additionally, input from a gyrocompass and differential GPS were also required and these were supplied by a TSS Meridian gyrocompass and a Trimble DGPS receiver. All positions were corrected to the transducer location so that the processed bathymetry data was correctly located. Data processing: Fathoms personnel used a GeoSwath Plus processing package on a second PC. Bathymetry data is in UTM zone 30N and the backscatter was in UTM zone 29N. Backscatter data: ARCGRID; TIF images. Fledermaus (.sd) available on request. For more detailed information on the acquisition equipment and data collection techniques, operational standards, data processing methods and quality control procedures used on this survey see the Report of Survey/Cruise Report and associated documentation where available. The information available may vary depending on the age of the survey. Data are checked and loaded to the BGS Coastal and Marine data management system following BGS marine data management procedures.

Conformity

Conformity report

specification

title

reference date

date type

publication

effective date

2011

degree

false

explanation

See the referenced specification

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Constraint set

Use constraints

unrestricted use, copyright acknowledgement - Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced British Geological Survey materials "Contains British Geological Survey materials ©UKRI [year]"

Limitations on public access

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Responsible organisations

Responsible party

organisation name

British Geological Survey (BGS)

full postal address

The Lyell Centre, Research Avenue South

Edinburgh

EH14 4AP

UK

telephone number

+44 (0)131 667 1000

facsimile number

+44 (0)131 668 4140

email address

enquiries@bgs.ac.uk

responsible party role

custodian

Responsible party

organisation name

British Geological Survey (BGS)

full postal address

The Lyell Centre, Research Avenue South

Edinburgh

EH14 4AP

UK

telephone number

+44 (0)131 667 1000

facsimile number

+44 (0)131 668 4140

email address

offshoredata@bgs.ac.uk

responsible party role

originator

Metadata on metadata

Metadata point of contact

organisation name

British Geological Survey (BGS)

full postal address

The Lyell Centre, Research Avenue South

Edinburgh

EH14 4AP

UK

telephone number

+44 (0)131 667 1000

facsimile number

+44 (0)131 668 4140

email address

enquiries@bgs.ac.uk

responsible party role

pointOfContact

Metadata date

2024-04-11

Metadata language