OR/14/029 Glossary
BGS Lexicon
The Lexicon of Named Rock Units is a list of geological units that appear on all BGS geological maps, with details on their lithologies. This is accessible via the BGS website at: http://www.bgs.ac.uk/Lexicon
Bid file GSI3D borehole identity file derived from the SOBI database (see below), which stores the locations of boreholes as eastings, northings and start heights
Blg file GSI3D borehole log file, which stores the interpretation downloaded from the Borehole Geology database
BoGe BGS Borehole Geology database for the standardised entry of data recorded on borehole logs
DiGMapGB-50 Digital 1:50 000 geological map data
DTM Digital Terrain Model – a model of surface of the solid Earth (generally the boundary between geosphere and atmosphere or hydrosphere). This is traditionally derived from OS contours and spot heights and should therefore exclude all buildings, trees, hedges, crops, animals etc. Sometimes also referred to as a ‘bald earth’ model
Envelope Defined here as the extent, or coverage, of a geological unit in plan view, forming a 2D distribution map of the particular unit, or presence/absence map
Fence 'Diagram The completed framework of cross-sections
GDI Geoscience Data Index, an ArcGIS platform for displaying BGS data, including boreholes, with links to scans, and geological map polygons
Georeferenced ArcGIS process where a scanned image is registered to British National Grid
GOCAD'® 3d geological modelling package utilised mainly for bedrock modelling.
GOCAD® Consortium web site: http://www.gocad.org/w4/index.php/consortium/consortium
GSI3D Geological Surveying and Investigation in 3D, a geoscience modelling software package. GSI3D Research Consortium web site: http://www.gsi3d.org.uk
SOBI Single Onshore Borehole Index, a database where location details of borehole logs are stored, giving positional information in x, y and z with respect to British National Grid
TIN Triangular Irregular Network – a digital elevation surface with triangle- shaped cells, rather than grid squares