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Chapter 3 Working with Profiles and Vertical Alignments
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Defining the Finished Ground Centerline as a
Vertical Alignment
After drawing the tangents and vertical curves for the finished ground
centerline, you must define the finished ground centerline as a vertical
alignment. When you define the finished ground centerline, the elevational
data is saved to a database that is used for creating cross sections.
To define the finished ground centerline as a vertical alignment
1 From the Profiles menu, choose FG Vertical Alignments ä Define
FG Centerline.
The command turns off all layers except the finished ground layer. If the
vertical alignment objects are not visible after you select this command, then
cancel the command and move the objects to the correct layer. The correct
layer is the layer you defined for finished ground objects when using the FG
Layers command. By default, this layer name is PFGC.
You can set the correct layer current based on your settings by selecting the Set
Current Layer command from the FG Centerline Tangents menu.
2 Select the starting point of the alignment.
This should be the point with the lowest station value. For a left to right profile,
it is the left end of the vertical alignment. For a right to left profile, it is the
right end. The command sets the object snap to END automatically.
3 Select the objects that make up the alignment. Use a window or crossing to
select the entire alignment.
4 Press ENTER.
The command displays the number of PVIs included in the selection set. The
layers are then restored to their original state.
NOTE
If the Define FG Centerline command displays the message No vertical
exists, then you cannot reference the finished and existing ground
information to the same station or location. Use the Set Current Profile
command to verify the location of the existing ground data, then define
the vertical alignment again.
The following illustration shows the points required to define the finished
ground alignment:
Defining finished ground