Creating a DTM

Creating a DTM

The create options allow you to create the triangles that form a DTM. There are two
options which use the model points in slightly different ways.

Normal:

This option will create triangles using the points and line features of
the model. The algorithm used is a constrained Delaunay algorithm
where triangles are formed to be as near equilateral as possible.
After each point on a line feature is introduced, n4ce will try and
force it into the DTM. This ensures that triangles follow surface
features, such as tops and bottoms of banks.

Unconstrained:

This option will create triangles using only the points of the model.
The algorithm used is a pure Delaunay algorithm where triangles
are formed to be as near equilateral as possible.

Note: That the Delaunay triangulation algorithm only works with the plan
position of the points and height values are ignored and that it is not possible to
model vertical faces.