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Chapter 3 Working with Profiles and Vertical Alignments
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Changing the Grade Going into the PVI for the
Finished Ground Centerline
To edit the grade going into the PVI for a finished ground tangent, use the
Change Grade 1 command. The Change Grade 1 command alters the grade of
the tangent coming into the PVI (Point of Vertical Intersection).
To change the grade going into the PVI for the finished ground centerline
1 From the Profiles menu, choose FG CenterlineTangents ä Change Grade 1.
2 Select the tangent that represents the grade coming into the PVI. (This is the
tangent that has its grade modified).
3 Select the tangent that represents the grade coming out of the PVI.
The following prompt is displayed:
Grade coming into PVI:
4 Enter a value for the new grade in percent, but dont enter the % character.
5 Select another tangent to continue the command, or press ENTER to end the
command. The command holds the start point of the first tangent, as well as
the grade and end point of the second tangent. It applies the new grade to the
first tangent, calculating the new intersection point with the second tangent to
determine the location of the location of the PVI.
If you use this command after you have added a vertical curve to the PVI, the
command leaves the vertical curve and any labels in their original positions.
Erase the vertical curve, and then recreate it with the Vertical Curve command.
The following illustration shows the new location of a PVI after you change the
grade in:
Changing the grade in