The TIN is first created using Vertex Options under the TINs menu bar.
By selecting an elevation, and a location on the background
raster graphic, or DRG), a point is added to the map at
shown in Figure 3.21.
map (such as a digital specified elevation as be imported from a
LIDAR or aerial land survey.
Figure 3.21: Vertex Options in WMS
Once the user is satisfied with the amount of points, TIN breaklines may be added to the model to reflect streams and other terrain features. When breaklines are added, the triangles created conform to these lines. So that the TIN conforms to the terrain, breaklines must be created where the water drains. This is done by selecting the conceptual (map) model icon and turning off the TIN.