OR/14/044 Glossary

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Terrington, R L, Shelley, C, and Ramos Cabrera, L. 2014. Model metadata report for the Leeds-Aire Valley 3D geological model. British Geological Survey Internal Report, OR/14/044.
DTM Digital Terrain Model — 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 ‘bald earth’ models
Envelope Defined here as the extent of a geological deposit in plan view (2D): forming a distribution map of the particular unit, a presence — absence map
GSI3D Geological Surveying and Investigation in 3D geological modelling software