563d60b3-84c0-a649-e063-3050940ac3dc English dataset British Geological Survey +44 131 667 1000 The Lyell Centre, Research Avenue South EDINBURGH LOTHIAN EH14 4AP United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-08-25 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13608741 OSGB 1936 / British National Grid (EPSG::27700) Superficial Deposit Thickness Model (SDTM) version 8 2025 creation http://data.bgs.ac.uk/id/dataHolding/13608741 The Superficial Deposit Thickness Model (SDTM) is a package of datasets which demonstrate the regional variation in superficial deposits thickness across Great Britain. These deposits are unconsolidated sediments which lie on top of bedrock and may include river channel and floodplain deposits, beach sands, talus gravels and glacial drift and large areas of peat. Superficial deposits are of importance for geologists, civil engineers, hydrogeologists and environmental scientists as they are often unconsolidated and, together with other processes, form pathways for groundwater to travel along. Their thickness over much of the country relates to the glacial history of the UK over the Quaternary period. SDTM datasets combine borehole data records and mapped superficial and artificial geology (at 1: 50 000 scale). SDTM comprises four raster layers; • the Terrain Adjusted Model (TAM) • the Observation Driven Model (ODM) • the Rockhead Elevation Model (RHEM) • the Data Distance (DataDist) uncertainty layer These component layers provide the user with 50m x 50m cell size rasterised surfaces of potential superficial sediment thickness distribution across Great Britain as well as information on the distribution of the input data sources. The intended scale of use of this dataset is 1:100,000 with a vertical modelled precision of +/-5m elevation. The dataset is intended for use at national, regional and local scales but not site scales where specific ground investigation works should be undertaken to determine superficial thickness and / or rockhead elevation. An accompanying User Guide (OR25087) can be downloaded from the product webpage https://www.bgs.ac.uk/datasets/superficial-deposit-thickness-model/ Enquiries British Geological Survey 0115 936 3142 0115 936 3276 The Lyell Centre, Research Avenue South EDINBURGH LOTHIAN EH14 4AP United Kingdom enquiries@bgs.ac.uk distributor Enquiries British Geological Survey 0115 936 3142 0115 936 3276 The Lyell Centre, Research Avenue South EDINBURGH LOTHIAN EH14 4AP United Kingdom enquiries@bgs.ac.uk pointOfContact notPlanned https://resources.bgs.ac.uk/images/geonetworkThumbs/563d60b3-84c0-a649-e063-3050940ac3dc.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Boreholes Surficial geology Quaternary Sediments BGS Thesaurus of Geosciences 2022 revision UK Location (INSPIRE) Citable Data BGS Data Products dataCentre NERC_DDC otherRestrictions license Either : (i) the dataset has not been formally approved by BGS for access and use by external clients under license; and / or (ii) the dataset contains 3rd party data or information obtained by BGS under terms and conditions that must be consulted before the dataset can be provided to, or accessed by, BGS staff or external clients. 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 access restrictions. This staff member should revert to the IPR Section (IPR@bgs.ac.uk) for advice, should the position not be clear. otherRestrictions 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. 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. The dataset is made available to external clients under BGS Digital Data Licence terms and conditions. Revert to the IPR Section (iprdigital@bgs.ac.uk) if further advice is required with regard to permitted usage. vector English geoscientificInformation ISO 3166_2 2009 revision GBN British Geological Survey Gazetteer: Geographical hierarchy from Geosaurus 1979 creation GREAT BRITAIN [id=139600] -7.4829 2.6955 49.8165 60.7850 2024-12 GeoTIFF Enquiries British Geological Survey 0115 936 3142 0115 936 3276 The Lyell Centre, Research Avenue South EDINBURGH LOTHIAN EH14 4AP United Kingdom enquiries@bgs.ac.uk distributor https://www.bgs.ac.uk/datasets/superficial-deposit-thickness-model/ WWW:LINK-1.0-http--link information https://doi.org/10.5285/136bacd3-5074-4370-ad82-e8c06d0719bb WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) British Geological Survey. (2026). Superficial Deposit Thickness Model (SDTM) version 8. British Geological Survey. (Dataset). https://doi.org/10.5285/136bacd3-5074-4370-ad82-e8c06d0719bb information dataset dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology 2011 publication See the referenced specification false 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 2010-12-08 publication See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF false SDTM v8 is the fifth iteration of this BGS data product and is preceded by v5, v2.1, v2 and v1. These version numbers refer to the version of the BGS Geology 50k superficial maps used as inputs to the model. The BGS Borehole Geology database which contains the interpreted borehole logs used as inputs to the model was queried on 03/12/2024 therefore any borehole interpretations added to this database after this date have not been considered by this model. The Ordnance Survey Terrain 50m DTM dataset used to create SDTM v8 was last updated in July 2024.