Map based index (GeoIndex) gravity anomalies
Simple
- Date ( Creation )
- 2000
+44 115 936 3276
- Maintenance and update frequency
- As needed
- GEMET - INSPIRE themes
- BGS Thesaurus of Geosciences
-
- Geophysics
- Gravity anomalies
- Gravity values
- Keywords
-
- NERC_DDC
- Use 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.
- Access constraints
- Other restrictions
- Other constraints
- otherRestrictions
- Denominator
- 250000
- Metadata language
- Englishen
- Topic category
-
- Geoscientific information
- Geographic identifier
-
GBN
- Date ( Revision )
- 2009
- Geographic identifier
-
GREAT BRITAIN [id=139600]
- Date ( Creation )
- 1979
- End date
- 2014 Before
- Supplemental Information
- Data is visible at map scales above 1:250 000 scale.
- Reference system identifier
-
OGP
/
urn:ogc:def:crs:EPSG::27700
- Date ( Revision )
- 2005
- Distribution format
-
-
Unknown
(
Unknown
)
-
Unknown
(
Unknown
)
+44 115 936 3276
- OnLine resource
- Gravity anomalies
- OnLine resource
-
Geophysics map theme
The wms layer for 'GeoIndex gravity anomalies' is held within the 'Geophysics' theme WMS layer which this URL connects to.
- OnLine resource
-
Geophysics map theme
The user will need to select 'Map layers' from the top left menu and select the 'Gravity anomalies' check box from the drop down menu to view the data.
- Scope
- Dataset
- Other
- dataset
Conformance result
- Date ( Publication )
- 2011
- Explanation
- See the referenced specification
- Pass
Conformance result
- Date ( Publication )
- 2010-12-08
- Explanation
- See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
- Pass
- 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 XML
- Metadata language
- Englishen
- Resource Type
- Dataset
- Date stamp
- 2020-07-08T09:20:11
- Metadata standard name
- NERC profile of ISO19115:2003
- Metadata standard version
- 1.0
- Dataset URI
- http://data.bgs.ac.uk/id/dataHolding/13605466