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Basic
- Full
metadata
Reference System
referenceSystemIdentifier:
code:
http://www.opengis.net/def/crs/EPSG/0/27700
code:
OSGB 1936 / British National Grid (EPSG::27700)
Identification
Title:
Map based index (GeoIndex) gravity anomalies
code:
http://data.bgs.ac.uk/id/dataHolding/13605466
Abstract:
This low-resolution image has been produced from BGS land and marine gravity data. The colour was generated using the BGS COLMAP software package. Colour levels are defined by histogram equalisation. Combining this image with the grey shaded relief image produces a similar image to the colour shaded relief image. The measured gravity values have been corrected in order to show the anomalies attributable to variations in crustal density. In broad terms the blues are attributable to large volumes of low density rocks, the reds to high density rocks. Significant lows occur, for instance, over areas of thick, low density sedimentary rocks(e.g. Cheshire Basin, Wessex Basin), or large granites (eg Cornwall). For marine data, free-air anomalies have been calculated from observed gravity values along marine survey lines. Line intersection errors between crossing lines and overlapping surveys have been used using network adjustment techniques. Free air anomalies have been calculated for sea-bottom stations. For land data, bouguer anomalies have been calculated from gravity observations at points of known height. In order to minimise the effect of topography, Bouguer corrections for the British Mainland have been applied using a density estimated for each station. Elsewhere a correction density of 2.67 Mg/m3 has been used. Corrections for the gravitational effect of terrain have been made where significant, and in a general extent to a radius of 48.6km. The data have been interpolated onto a 1km x 1km grid using a variable tension technique, and smoothed.
Individual Name:
Enquiries
Organisation Name:
British Geological Survey
Delivery Point:
Environmental Science Centre, Nicker Hill, Keyworth
administrative Area:
NOTTINGHAMSHIRE
e-mail:
enquiries@bgs.ac.uk
Individual Name:
Enquiries
Organisation Name:
British Geological Survey
Delivery Point:
Environmental Science Centre, Nicker Hill, Keyworth
administrative Area:
NOTTINGHAMSHIRE
e-mail:
enquiries@bgs.ac.uk
MD_MaintenanceInformation:
maint. / update frequency:
asNeeded
File Name:
https://resources.bgs.ac.uk/images/geonetworkThumbs/9df8df53-2a94-37a8-e044-0003ba9b0d98.png
keyword:
http://www.eionet.europa.eu/gemet/concept?cp=13&langcode=en&ns=5
Title:
GEMET - INSPIRE themes, version 1.0
keyword:
UK Location (INSPIRE)
keyword:
Gravity anomalies
Title:
BGS Thesaurus of Geosciences
keyword:
http://www.data.gov.uk
keyword:
UK Location (INSPIRE)
keyword:
http://scotgovsdi.edina.ac.uk
Access Constraints:
otherRestrictions
Other Constraints:
http://inspire.ec.europa.eu/metadata-codelist/LimitationsOnPublicAccess/INSPIRE_Directive_Article13_1d
Other Constraints:
The usual BGS licensing terms and conditions apply to external use of the data.
Use Constraints:
otherRestrictions
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:
Either: (i) the dataset is made freely available, e.g. via the Internet, for a restricted category of use (e.g. educational use only); or (ii) the dataset has not been formally approved by BGS for access and use by external clients under licence, but its use may be permitted under alternative formal arrangements; or (iii) the dataset contains 3rd party data or information obtained by BGS under terms and conditions that must be consulted in order to determine the permitted usage of the dataset. Refer to the BGS staff member responsible for the creation of the dataset if further advice is required. He / she should be familiar with the composition of the dataset, particularly with regard to 3rd party IPR contained in it, and any resultant use restrictions. This staff member should revert to the IPR Section (ipr@bgs.ac.uk) for advice, should the position not be clear.
Spatial Representation Type:
grid
topicCategory:
geoscientificInformation
westBoundLongitude:
-7.5600
eastBoundLongitude:
2.0000
southBoundLatitude:
49.7600
northBoundLatitude:
60.8400
Title:
British Geological Survey Gazetteer: Geographical hierarchy from Geosaurus
code:
GREAT BRITAIN [id=139600]
Supplemental Information:
Data is visible at map scales above 1:250 000 scale.
Distribution
Individual Name:
Enquiries
Organisation Name:
British Geological Survey
Delivery Point:
Environmental Science Centre, Nicker Hill, Keyworth
administrative Area:
NOTTINGHAMSHIRE
e-mail:
enquiries@bgs.ac.uk
Digital Transfer Options:
linkage:
https://map.bgs.ac.uk/arcgis/services/GeoIndex_Onshore/geophysics/MapServer/WMSServer?
name:
Geophysics map theme
description:
The wms layer for 'GeoIndex gravity anomalies' is held within the 'Geophysics' theme WMS layer which this URL connects to.
Digital Transfer Options:
linkage:
http://mapapps2.bgs.ac.uk/geoindex/home.html?layer=BGSGravAnom
name:
GeoIndex gravity anomalies
Digital Transfer Options:
linkage:
http://mapapps2.bgs.ac.uk/geoindex/home.html?layer=BGSGravAnomGrey
name:
GeoIndex gravity anomalies (grey shaded)
Digital Transfer Options:
linkage:
http://mapapps2.bgs.ac.uk/geoindex/home.html?layer=BGSGravCol
name:
GeoIndex gravity anomalies (colour shaded)
Data Quality
Title:
INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology
explanation:
See the referenced specification
Title:
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
explanation:
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
statement:
This low-resolution image has been produced from BGS land and marine gravity data. The colour was generated using the BGS COLMAP software package. Colour levels are defined by histogram equalisation. Combining this image with the grey shaded relief image produces a similar image to the colour shaded relief image. The measured gravity values have been corrected in order to show the anomalies attributable to variations in crustal density. In broad terms the blues are attributable to large volumes of low density rocks, the reds to high density rocks. Line intersection errors between crossing lines and overlapping surveys have been dealt with using network adjustment techniques. Free air anomalies have been calculated for sea-bottom stations. For land data, bouguer anomalies have been calculated from gravity observations at points of known height. In order to minimise the effect of topography, Bouguer corrections for the British Mainland have been applied using a density estimated for each station. Elsewhere a correction density of 2.67 Mg/m3 has been used. Corrections for the gravitational effect of terrain have been made where significant, and in a general extent to a radius of 48.6km. The data have been interpolated onto a 1km x 1km grid using a variable tension technique, and smoothed.
Metadata
File Identifier:
9df8df53-2a94-37a8-e044-0003ba9b0d98
Organisation Name:
British Geological Survey
Delivery Point:
Environmental Science Centre,Keyworth
administrative Area:
NOTTINGHAMSHIRE
e-mail:
enquiries@bgs.ac.uk
Metadata Standard Name:
http://vocab.nerc.ac.uk/collection/M25/current/GEMINI/
Metadata Standard Name:
UK GEMINI
Metadata Standard Version:
2.3
Dataset URI:
http://data.bgs.ac.uk/id/dataHolding/13605466