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| Terrington, R L, Thorpe, S. 2018. Post-calculation checks of GSI3D Models V2. British Geological Survey Open Report, OR/18/010.
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| Envelope
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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. May include an area of outcrop, subcrop or a combination of both
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| Grid
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An exported surface or thickness as a gridded object with a specified cell size
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| GSI3D
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The Geological Surveying and Investigation in 3-D software and methodology
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| Helper
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A sections used to constrain the calculation in areas of few sections or thin units such as Alluvium or Head
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| Section
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Defined here as a vertical x, z plane attributed with correlation lines
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| Surface
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Base or top of a geological unit exported as a grid or TIN
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| TIN
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Triangular Irregular Network. GSI3D exports TINs in Indexed Triangle Mesh format (VRML97)
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| Triangulation
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A form of interpolation (Delauney) that uses TINS in GSI3D to form the base and top surfaces of a unit
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| Unit
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A geological unit is a particular geological deposit that has been identified and mapped out during a GSI3D project. A unit is defined by its basal surface in sections and an envelope of its lateral extent. The top of the unit is back calculated during
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