Digital Terrain Models (DTMs) are formed by linking a triangulated irregular network (TIN) of points.

Breaklines are automatically applied, even around curves where an arc-to-chord tolerance can be specified.

Nominate which surface features are to be included in the model.

Check for crossing breaklines or duplicate points with height differences.

Model Boundaries can be applied limit the extent of contours, perspective views, long sections and cross sections or volumes. These boundaries can include arcs.

DTM volume reports include the total horizontal and surface areas of the triangles, and also check the horizontal area against the boundary.

Contour extracted from a DTM can be displayed or plotted, with differentiated index contours, and with user-controlled smoothing. Contour label placement can be automatic or manual.

Accurate net prismoidal volumes can be calculated between:

• • • • • • • • • • • • The modelled surface and a datum plane, or

                      • Two modelled surfaces.

Show thicknesses by isopachs and height differences.

Heights, and height differences, can be interpolated from a DTM and shown by reports, height labels, contours and volumes.