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Table Of Contents
Chapter 4 Working with Cross Sections
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10 Press ENTER after picking all the datum points. The command prompts you to
save the subassembly.
11 Type Yes to save the subassembly, and then type the subassembly name.
The command stores the subassembly definition in the folder set using the Set
Template Path command. It is saved with a file extension of .sub. If the
subassembly already exists, then you can either overwrite the existing
subassembly or rename the subassembly.
12 Type Y or N:
n
Type Y to overwrite the existing subassembly definition.
n
Type N to enter a new subassembly name.
After the subassembly has been saved, a prompt is displayed asking if you would
like to define another subassembly.
13 Type Y or N:
n
Type Y to define another subassembly.
n
Type N to exit the command.
The following illustration shows places to pick the curb and shoulder
connection points:
Subassembly definition
Datum Lines and Top Surface Definitions for
Templates and Subassemblies
Subassemblies and templates require a definition for a datum line and a top
surface. Both the datum line and the top surface are defined similarly, but differ
in how they are used.
The datum line defines the boundary along a cross section template from which
cut and fill volumes are calculated. When a subassembly is attached to a cross
section template, the datum lines from all subassemblies are combined with the
datum line of the cross section template to create a continuous datum line
across the entire template assembly.
When the template assembly is applied at a cross section, the datum line is
automatically extended along any ditch or design slopes out to the daylight
point where the design slope meets the existing ground surface. The entire
datum line is then compared against the existing ground surface to generate cut
and fill areas for each section, which are used to generate a total volume along
the alignment. If the datum line is not defined, then a datum line is
automatically generated by connecting the two connection points with a
straight line.