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Ground Model (or Model)

This is a .kgm file representing a surface (existing, proposed or for analytical purpose such as cut and fill and visibility) as a number of triangles. Most models are created from 3D drawing entities.

 

Drape

Convert 2D drawing entities (usually 2D Polylines) into 3D by projecting them onto or draping over a model. Also used in a powerful design setting to convert 2D Polylines into 3D Polylines by menu items Design, Vertical, Drape onto Uniform surface and Design, Strings, Drape onto Road surface.

 

Interface

Where an embankment intersects a Ground Model – usually represented as a 3D Polyline.

 

Uniform surface

A plane that may or may not be horizontal. Contours from a tilting Uniform surface model (technically this will have two triangles) will all be parallel. A horizontal uniform surface may be used to represent water at a specific level. See menu items Ground Modelling, Create model, Uniform surface and Design, Vertical, Drape onto Uniform surface.

 

ZTV

Zones of Theoretical Visibility (aka ZVI Zones of Visual Impact).