2.0

Chapter 4 Working with Cross Sections
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NOTE
If a cross section does not cross the surface, then the command displays
the following message:
WARNING: Some sections failed to cross the alignment
and will be missing from output.
When a section is completely outside the surface area, the existing ground
information cannot be calculated so that the section is not created.
Sampling the Existing Ground Section Data from
Multiple Surfaces
You can sample existing ground elevations along the current alignment from
multiple surfaces by enabling the using of multiple surfaces, selecting the
surfaces to sample, and using the Sample From Surface command.
This command samples the existing ground data for the entire length of the
current alignment.
To sample existing ground definition from multiple surfaces
1 Create and define the horizontal alignment.
For more information, see the chapter Alignments in the AutoCAD Land
Development Desktop Users Guide.
2 Create the surfaces you want to sample.
3 Enable the use of multiple surfaces.
4 Select the multiple surfaces you want to sample.
5 From the Cross Sections menu, choose Existing Ground ä Sample From Surface
to display the Section Sampling Settings dialog box.
6 Enter the settings.
All of the options and defaults shown in this dialog box are described in detail
in Changing the Cross Section Sampling Settings in this chapter.
NOTE
If you are using the Sample From Surface command to add another surface
definition to the sections, then you may want to make sure that the section
sampling settings are such that the stations and width match the current
existing ground sections. Enter
No
to overwrite the existing cross section file
prompt to add additional surface information.
7 Click OK to close the Section Sampling Settings dialog box.
If you selected the Add specific stations check box in the Section Sampling
Settings, then the following prompt is displayed:
Enter critical station (or Point):
At this prompt you can include additional sections at specific stations that may
not be covered by the intervals specified in the Section Sampling Settings dialog
box.