2.0

Creating Existing Ground Cross Sections
257
At the prompt to overwrite the existing cross section, accept the default option
No. This adds the new existing ground cross sections to the file without
overwriting any that had previously been sampled. The other option is to use
the Edit Sections command and insert the new cross sections by entering offset
and elevation information.
When resampling from a surface, you can also enter Yes at the prompt to
overwrite the previously sampled cross sections if you want to change the swath
width and/or the station sampling options, and/or the surface definition was
changed. This option completely deletes the previously sampled cross sections
and re-samples the cross sections.
6 Click OK to close the Section Sampling Settings dialog box.
The command prompts you to enter the range of stations along the current
alignment you want to sample.
7 Type the station of the alignment at which to start sampling the existing
ground.
8 Type the station of the alignment at which to end sampling the existing
ground. 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.
9 Do one of the following:
n
Type an additional station to sample. If you must sample more than one
station, press ENTER and type the additional station.
n
Type Point, and then on the plan view of the alignment, use your pointing
device to select the additional station locations you want to sample.
If the existing ground cross section information already exists, then the
following prompt is displayed:
Overwrite existing section data (Yes/No) <Yes>:
10 Type Yes or No:
n
Type Yes to delete the existing ground cross section information then
resample it based on the current settings.
n
Type No to keep the existing ground information and merge the new
information into the cross sections that were created previously (from a
different surface). However, existing ground section data is overwritten if you
are sampling the same surface that was sampled previously.
n
The command samples the terrain data from the surface. When it is finished
sampling, the command displays the amount of the alignment that has been
sampled.