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National Superficial Deposits Thickness Model (SDTM)

A series of tiled models of superficial thickness covering the UK. The models are derived by direct modelling (natural neighbour interpolation) of BGS borehole records and BGS DiGMapGB-50. For the purposes of modelling, superficial deposits include sediments deposited during the Quaternary, subsequent Holocene rivers and coastal systems and also modern anthropogenic material, i.e. deposits that are less than 2.6 million years old. The 50 m x 50 m grids are overprinted with a minimum value so that areas where no bore data is present, but drift is known to occur, are given a minimum 1.5 m thickness. The superficial thickness models have been created as baseline datasets for the BGS Geohazard programme. They represent the first attempt by BGS to create nationwide models of such data and the models provide only a simple, mathematical interpretation of reality. The complexity of superficial deposits in Great Britain is such that it is only possible to model indicative values of thickness and elevation. The models should never be used as a substitute for thorough site investigation. The SDTM comprises three individual datasets; two datasets describe thickness variation and a third dataset details 'proximity' of the modelled data to the original source information. 1. The ASTM (Advanced Superficial Thickness Model) is a model of thickness variation indirectly derived from archive borehole records and map data. 2. The BSTM (Basic Superficial Thickness Model) is a model of thickness variation directly derived from archive borehole records. 3. The DBUFF (distance buffer) dataset is a calculation of spatial distance to the location of any data point used in the model. This provides the user with an indication as to how far the computer has had to interpolate and extrapolate the data from a measured observation point. For more information, refer to the user guide: The National Superficial Deposit Thickness Model (version 5). BGS Open Report OR/09/49. https://webapps.bgs.ac.uk/data/publications/publication.html?id=19867430

Simple

Date (Creation)
2001
Date (Revision)
2008-08
Identifier
http://data.bgs.ac.uk/id/dataHolding/13480413
Distributor
  British Geological Survey - Enquiries
The Lyell Centre, Research Avenue South , EDINBURGH , LOTHIAN , EH14 4AP , United Kingdom
0115 936 3142
0115 936 3276
Point of contact
  British Geological Survey - Enquiries
The Lyell Centre, Research Avenue South , EDINBURGH , LOTHIAN , EH14 4AP , United Kingdom
0115 936 3142
0115 936 3276
Distributor
  British Geological Survey - Enquiries
Environmental Science Centre, Nicker Hill, Keyworth , NOTTINGHAM , NOTTINGHAMSHIRE , NG12 5GG , United Kingdom
0115 936 3143
0115 936 3276
Originator
  British Geological Survey - Enquiries
Environmental Science Centre, Nicker Hill, Keyworth , NOTTINGHAM , NOTTINGHAMSHIRE , NG12 5GG , United Kingdom
0115 936 3143
0115 936 3276
Point of contact
  British Geological Survey - Enquiries
Environmental Science Centre, Nicker Hill, Keyworth , NOTTINGHAM , NOTTINGHAMSHIRE , NG12 5GG , United Kingdom
0115 936 3143
0115 936 3276
Maintenance and update frequency
asNeeded As needed
GEMET - INSPIRE themes, version 1.0
  • Geology
BGS Thesaurus of Geosciences
  • UK Location (INSPIRE)
  • Geological data
  • Geological models
  • Quaternary
  • Surficial geology
dataCentre
  • UK Location (INSPIRE)
Keywords
  • NERC_DDC
Access constraints
otherRestrictions Other restrictions
Other constraints
restricted
Other constraints
The dataset has been formally approved by BGS for access by external clients under a BGS Digital Data Licence, issued via BGS's IPR Section. The dataset must not be provided to, or be accessible by, an external client until the IPR Section confirms that signed licence documentation is in place. Refer to the IPR Section (DigitalLE@bgs.ac.) if further advice is required.
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
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 Grid
Distance
50  urn:ogc:def:uom:EPSG::9001
Metadata language
EnglishEnglish
Topic category
  • Geoscientific information
Geographic identifier
GB

Date (Revision)
2009

Geographic identifier
UK [id=139300]

Date (Creation)
1979

Geographic identifier
UKM

Date (Revision)
2009

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Begin date
2002-09
End date
2017-10
Supplemental Information
All grids have been compiled to the same written standard using the same software, see report "Generation of Superficial Deposits Thickness Models and Rockhead contours for Great Britain", BGS Internal Report IR/04/082R. Cell size or grid spacing is of 50 meters.
Unique resource identifier
OSGB 1936 / British National Grid (EPSG::27700)
Unique resource identifier
WGS 84 (EPSG::4326)
Distribution format
  • ESRI ArcInfo ASCII Grid ()

  • Raster GIS data ()

  • MapInfo (TAB) ()

Distributor
  British Geological Survey - Enquiries
The Lyell Centre, Research Avenue South , EDINBURGH , LOTHIAN , EH14 4AP , United Kingdom
0115 936 3142
0115 936 3276
Distributor
  British Geological Survey - Enquiries
Environmental Science Centre, Nicker Hill, Keyworth , NOTTINGHAM , NOTTINGHAMSHIRE , NG12 5GG , United Kingdom
0115 936 3143
0115 936 3276
OnLine resource
Superficial thickness model ( WWW:LINK-1.0-http--link )
Hierarchy level
dataset Dataset
Other
dataset

Conformance result

Date (Publication)
2011
Explanation
See the referenced specification
Pass
No

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
No
Statement
The data are derived from three primary sources: boreholes, geological map data and a digital terrain model (topography). Borehole data were derived entirely from the BGS Single Onshore Borehole Index (SOBI). All boreholes in SOBI at the time of data creation were assessed, and where possible, some indication of superficial deposit thickness was digitally captured. Geological map data were derived from DiGMapGB-50 version 5. Digital terrain data were derived from the Intermap® NextMap© DTM product. BGS SOBI/BoGE and BGS Digmap v.1.04 and v. 1.05 for the original data set (version 1). The versions of Digmap will change with the versions of the GeoHazarDs superficial thickness models.
File identifier
9df8df51-63de-37a8-e044-0003ba9b0d98 XML
Metadata language
EnglishEnglish
Hierarchy level
dataset Dataset
Date stamp
2025-12-11
Metadata standard name
UK GEMINI
Metadata standard version
2.3
Point of contact
  British Geological Survey
Environmental Science Centre, Keyworth , NOTTINGHAM , NOTTINGHAMSHIRE , NG12 5GG , United Kingdom
+44 115 936 3100
Dataset URI
http://data.bgs.ac.uk/id/dataHolding/13480413
 
 

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