Share

Creating an Alignment from an Existing Alignment

Product Documentation
Intermediate
View Original

Create an alignment from all or part of an existing alignment.

This command enables you to use a portion of an existing alignment as a starting point for a new alignment. The selected geometry in the source alignment is converted to line, curve, and spiral sub-entities in the new alignment.

This command is useful when you need to perform the following tasks:

  • Extract a portion of a source alignment to use as a baseline to create a secondary alignment that merges with or exits from the primary (source) alignment.

    Select a source alignment (1), and then specify a range of stations (2) to create an alignment (3). Add sub-entities onto the new alignment (4) to create an alignment that merges into or exits from the source alignment.

  • Explore route alternatives between two sections of a source alignment.

    Select a source alignment (1), and then specify sub-entities (2) from which to create an alignment (3). Add sub-entities onto the new alignment (4) to create an alternative design that is based on the source alignment.

Note

You can create the alignment using several, non-contiguous station ranges or alignment sub-entities from the source alignment. By default, the station values of the new alignment match the station values of the source alignment.

To create an alignment from an existing alignment

  1. Click Home tabCreate Design panelAlignment drop-down Create Alignment From Existing Alignment .At the Command prompt, enter CreateAlignFromExisting.
  2. Select an alignment in the drawing, or press Enter to select it from a list.

    The following prompt is displayed:

    Specify split point on alignment or [Entities/Finish] <Entities>:

    You can specify multiple, non-contiguous portions of the source alignment:

    • To add a range of stations from the source alignment, click the desired start and end stations, or enter station numbers at the command line.
      Note

      Some spiral types cannot be partially selected. If the

      Unable to create alignment from partial selection of this spiral type

      prompt is displayed, then you must specify start and end stations that encompass the entire spiral.

    • To add a series of sub-entities from the source alignment, press Enter. Click the desired sub-entities on the source alignment.
  3. Type ‘f’ to finish the selection.
  4. In the Create Alignment from Existing Dialog Box, enter a unique name for the alignment.
  5. Enter an optional description.
  6. Enter a starting station value.

    By default, this value is the lowest station that you specified, or the starting station of the beginning sub-entity that you selected.

  7. On the General tab, specify the following settings:
    • Site

      Specify a site with which to associate the alignment or accept the default <None>. For more information, see Understanding Sites.

    • Alignment Style
    • Alignment Layer
    • Alignment Label Set
  8. On the Design Criteria tab, specify a Starting Design Speed to apply to the alignment starting station.

    This design speed is applied to the entire alignment. Additional design speeds can be applied at other stations after the alignment has been created. For more information, see Alignment Properties.

    Note

    If you do not want to apply design criteria to the alignment, proceed to Step 10.

  9. To associate design standards with the alignment, select the Use Criteria-Based Design check box.

    For more information, see Criteria-Based Alignment Design.

    On the Design Criteria tab, specify the following settings:

    • Use Design Criteria File

      Select this check box to associate a design criteria file with the alignment. The default design criteria file location and the Default Criteria properties becomes available when you select the check box.

      Note

      The first design criteria file found in the C:\Documents and Settings\All Users|Application Data\Autodesk\AutoCAD Civil 3D2013\enu\Data\Corridor Design Standards\<units> directory is used by default when the criteria-based design feature is used.

    • Use Design Check Set

      Select this check box to associate a design check set with the alignment. The design check set list becomes available when you select the check box. Select a design check set from the list.

  10. Click OK.

Ribbon

Home tab Create Design Panel Alignment drop down Create Alignment from Existing Alignment

Command Line

CreateAlignFromExisting

Dialog Box

Create Alignment from Existing Dialog Box


Was this information helpful?