Graphics Programs Reference
In-Depth Information
Incorrect Contours
FiGuRE 9.17
Contours displayed for the newly
created corridor surface. Note the incorrect contours in the
center of the site.
FiGuRE 9.18
Selecting the corridor extents as the basis
for creating a surface boundary
10.
Save and close the drawing.
You can view the results of successfully completing this exercise by opening
Creating a Corridor Surface - Complete.dwg
.
Alternate Corridor Surfaces
In this example, you created a surface that represents the top (finished) ground
elevations of the corridor. You could have selected any one of the codes contained
within the corridor, such as pave, datum, curb, and so on. Although most of these
codes aren't particularly useful for creating surfaces, several are. The datum
code, for example, is used to represent links that form the underside of the
materials that make up the road. Why is this important? These links represent
the trench, or
roadbed
, that must be excavated to accept road materials such as
stone, concrete, and asphalt. The excavation of the roadbed often represents
one of the most important aspects of constructing the project: earthmoving.
