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Chapter 3 Working with Profiles and Vertical Alignments
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If multiple surfaces are off, then the Sample From Surface commands do not use
the surfaces.txt file.
Creating a File of Multiple Surfaces for Sampling
the Existing Ground Profile Data
If you want to create a profile definition with existing ground subsurface
information, then use the Select Multiple Surfaces command. This command
creates a file named surfaces.txt that contains the list of surfaces to sample.
This command is intended for use in situations when you want to sample
subsurface data as well as the top existing ground surface from multiple terrain
surfaces. When you sample a profile from multiple surfaces, the profile contains
separate existing profile definitions for each surface. When you create a full
profile in the drawing, the command prompts you which existing ground
surface to use as the primary existing ground surface. You typically import the
top surface first to get the correct profile elevation labels. After that, you can run
the Surface Profile command to import the subsurfaces onto the profile.
However, subsurfaces are not given elevation labels.
To create a file of multiple surfaces for sampling the existing ground profile
data
1 From the Profiles menu, choose Surfaces ä Select Multiple Surfaces to display
the Multiple Surface Selection dialog box.
2 In the Select from list box on the left, hold down the CTRL key and click the
names of the surfaces you want to sample.
The surface name now appears in the Current list box on the right.
3 You can remove a surface from the Current list by holding down the CTRL key
and selecting the highlighted surface name from the Select from list box on the
left.
4 Click OK to use all the surfaces listed in the Current list.
Now when you sample the existing ground profile data, the data from all of the
selected surfaces is sampled if you used the Toggle Multiple Surfaces command.