Date (Creation)

2020-09-21

Identifier

http://data.bgs.ac.uk/id/dataHolding/13607673

Maintenance and update frequency

notApplicable notApplicable

GEMET - INSPIRE themes, version 1.0

• Geology

BGS Thesaurus of Geosciences

• Multibeam
• Bathymetry
• NGDC Deposited Data

dataCentre

• NGDC Deposited Data

Keywords

• NERC_DDC

Access constraints

otherRestrictions Other restrictions

Other constraints

licenceOGL

Other constraints

Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Use constraints

otherRestrictions Other restrictions

Other constraints

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.

Other constraints

Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Metadata language

EnglishEnglish

Topic category

• Geoscientific information

Geographic identifier

TONGA TRENCH [id=935500]

Date (Creation)

1979

Begin date

2019-05-29

End date

2019-06-06

Unique resource identifier

WGS 84 (EPSG::4326)

Distribution format

• BAG file ()

• xml ()

• XYZ file ()

• PDF ()

• tif ()

OnLine resource

Data

OnLine resource

Digital Object Identifier (DOI)

Hierarchy level

dataset Dataset

Other

dataset

Statement

All hydrographic surveys were executed aboard the DSSV Pressure Drop built in 1985 (68.28 m long by 13.11 m wide), fitted with a 1° x 2° Kongsberg EM 124 multibeam echosounder (MBES). All MBES data acquisition was undertaken at a typical vessel speed of 8 knots, with a swath width typically 2-3 times water depth or ~ 15-20 km. Survey lines were spaced between 6-7 km to ensure 100% overlap over areas of interest. All raw bathymetry data were processed in QPS Qimera and gridded to 75 m using CUBE algorithms. CUBE algorithms use the surrounding depth information and advanced statistical practices to determine the best estimate of depth while simultaneously calculating the uncertainty of those estimates. The total propagated uncertainty (TPU) was calculated for each dataset.

File identifier

b0269aad-0897-3583-e054-002128a47908 XML

Metadata language

EnglishEnglish

Hierarchy level

dataset Dataset

Date stamp

2024-10-03

Metadata standard name

UK GEMINI

Metadata standard version

2.3

Dataset URI

http://data.bgs.ac.uk/id/dataHolding/13607673