In this exercise, you will add two lines to correct the flat triangulation. Add the first between points 1 and 2.

1. On the Terrain menu, click Edit Surface Add Line.

2. Use Endpoint Osnaps to select the TIN vertex point inside circle 1 for the From point and the TIN vertex point inside circle 2 for the To point, and then press ENTER.

   The line is added between points 1 and 2 and that triangulation lines crossed by the new line are automatically deleted.

   Click here to see an illustration of the added TIN Line.

   Extraneous TIN lines, often long slivers that appear on the outside edges of surfaces should be deleted. Delete the sliver to the left of point 2.

3. On the View menu, click Named Views to display the View dialog box. Under Name, select 2B, click Set Current, and then click OK.

4. On the Terrain menu, click Edit Surface Delete Line.

5. 5Select the sliver TIN line, and then press ENTER.

The sliver TIN line is deleted.