Ground Modelling

Comprehensive surface creation, representation and volumes within CAD

KeyTERRA-FIRMA Ground Modelling works entirely within AutoCAD or Bricscad to calculate a series of 3D triangles to accurately represent the existing ground/site, design or other surface. The system is very simple to use but extremely flexible and suitable for a wide range of applications (in addition to typical Development and Road projects) including Coastal erosion studies, Hydrographic Survey, Landfill, Quarries and Airfield approach studies.

Rendered views of the model may be created within AutoCAD or Autodesk VIZ

Most models are created from drawing entities (3D Polylines are recognised as break lines) but very large models are also created rapidly from .xyz files. There is practically no limit to the number of triangles – several million is manageable subject to PC specification etc.

Outputs

Contour drawing (with a range of annotation/label options)
3D Grid for 3D viewing in CAD
Enquire level and gradient at any point within the modelled area
Average area calculation (to help fix slab level)
Create a long section by picking a 2D Polyline (e.g. representing horizontal alignment)*
Create cross sections*
Drape functions to convert 2D information into 3D
Embankments calculated and drawn to user specified gradients etc.
Volume calculations comparing two models (e.g. existing and proposed)
Water volume calculations
A number of model modification and reporting functions
Colour mapping using the true colours to illustrate cut and fill etc.
Slope analysis
Zones of Visual Impact (ZVI)

* Long and cross sections are drawn to high presentation standards with user specified styles
and provide massive time savings compared to “standard” CAD or the drawing board!

Examples

Cross sections instantly drawn to high presentation standards

Embankments drawn after 3D Designs
Colour mapping using true colours to illustrate beach loss and gain.		Contours are rapidly drawn as 2D Polylines to user specified intervals and layers etc.
		Water related features include volume calculation by banding as specified by the Environment Agency, flood area mapping, 3D views and functions to help with river modelling and balancing ponds.