In this exercise, you will add contour data from existing contours in the drawing.
In the Terrain Model Explorer, select Contours, and then right-click and click Add Contour Data to display the Contour Weeding dialog box.
Accept the defaults for Weeding and Supplementing factors by clicking OK.
Press ENTER to accept the default, Layer, for contour selection, and then select a contour line in the drawing.
Press ENTER to continue, and then press ENTER to process the contour data.
The contour data is displayed in the right pane of the Terrain Model Explorer.