SIS can read ground models from existing map data, e.g. OS (GB) Land-Form DTM 1:1000, 1:50000. The ground models can consist of DTM-s (Digital Terrain Models, a special kind of Grid item), or TIN items.
SIS can also create new TIN items using Create TIN [Create-3D] and Triangulate [Create-3D]. In addition, TIN items can be created from Grid items using Convert to TIN [Edit-TINs] .
You can use the Contour theme to annotate TIN ground models with contour lines.
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