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Table Of Contents
Chapter 4 Working with Cross Sections
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To define a ditch or transition as a vertical alignment
1 From the Cross Sections menu, choose Ditch/Transition ä Define Profile
Alignment.
The following prompt is displayed:
Select profile (Center/Left/Right) <Center>:
2 Select the type of profile alignment you want to define by typing the
appropriate letter.
Type R or L for Right or Left to display a prompt similar to the following:
Select left profile (Ditch/1/2/3/4/5/6/7/8) <1>:
3 Type D for Ditch, or enter the appropriate number for a transition.
Next, the command turns off all layers except the finished ground layer,
showing just the profile alignment line you specified.
NOTE
From the Profiles menu, choose DT Tangents
ä
Set Current Layer
command to set the correct layer. If any of the entities are drawn on the
incorrect layer, use the AutoCAD CHANGE command to fix them.
4 Pick the starting point of the alignment. This should be the point with the
lowest station value on the finished ground alignment. The command sets the
AutoCAD object snap to END automatically. The command then prompts for
the objects that make up the alignment.
5 Select the entire alignment using window or crossing to complete the
definition.
6 At the next Select objects prompt, press ENTER when all the entities that make
up the alignment have been selected. The command connects the entities and
writes the data to an external database.
Editing a Ditch or Transition Profile Alignment
You can use the Edit Profile Alignment command to enter the finished ground
for the alignment, or to view and edit existing ground data created graphically
with the Sample From Surface command in the Cross Sections menu.
1 From the Cross Sections menu, choose Ditches/Transitions ä Edit Profile
Alignment.
The following prompt is displayed:
Select profile (Center/Left/Right) <Center>:
2 Select the type of profile alignment you want to define by typing the
appropriate letter to display the select profile prompt.
The type of prompt that is displayed depends on which profile is selected (right
or left). For example, the following prompt is displayed if the left profile is
selected:
Select left profile (Ditch/1/2/3/4/5/6/7/8) <1>:
3 Select appropriate profile number or ditch option. The Vertical Alignment
Editor is displayed.
4 Click OK to exit the dialog box.