Frequency to Apply Assemblies Dialog Box

Use this dialog box to add stations to a corridor.

You can specify the frequency and placement settings for stations along the corridor.

Note: You can change the default values for the frequency and placement settings from the Edit Feature Settings dialog box for the CreateCorridor and CreateSimpleCorridor commands.

The properties table displays the following settings:

Corridor Information

Displays general information about the corridor.

Corridor Name: Displays the corridor name.
Baseline Name: Displays the corridor baseline (alignment) name.
Start Station: Displays the value for the first station for the current assembly region.
End Station: Displays the value for the last station for the current assembly region.

Alignment

Along Tangents

Specifies the assembly insertion frequency along the tangent portion of an alignment. Enter a value or click and select a distance in the drawing.

Along Curves

Specifies how the frequency for inserting assemblies along curves is determined.

By Curvature: Baseline alignment curves are tessellated using the Mid-Ordinate Distance To Define Curvature value. Stations are created along the tessellated curve at each point where the tessellation touches the curve, as shown in the following illustration:
At An Increment: Stations are placed along the curve at the value specified in the Curve Increment field.
Both: Uses both the By Curvature option and the At An Increment option.

Curve Increment

Specifies the assembly insertion frequency along the curve portion of an alignment. Enter a value or click and select a distance in the drawing. This field is not editable if By Curvature is selected as the Along Curves setting.

Mid-Ordinate Distance To Define Curvature

Specifies the value to define the mid-ordinate distance by which to tessellate baseline alignment curves. This field is not editable if At An Increment is selected as the Along Curves setting.

Along Spirals

Specifies the assembly insertion frequency along the spiral portion of an alignment. Enter a value or click and select a distance in the drawing.

At Alignment Geometry Points

Specifies whether the assembly should be inserted at alignment geometry points where the horizontal alignment geometry changes (such as the start of a curve).

At Superelevation Critical Points

Specifies whether the assembly should be inserted at superelevation critical points (such as ‘end normal crown,’ ‘level crown,’ ‘reverse crown,’ and ‘begin full super’).

Profiles

Along Profile Curves: Specifies the assembly insertion frequency along curve portions of the profile geometry. Enter a value or click and select a distance in the drawing.
At Profile Geometry Points: Specifies whether the assembly should be inserted at profile geometry points where the profile geometry changes.
At High/Low Points: Specifies whether the assembly should be inserted at the high and low points of the profile geometry.

Offset Target

At Offset Target Geometry Points

Specifies whether or not to automatically add assemblies based on offset target objects (feature lines, alignments, or polylines).

Note: If both an assembly frequency setting that references horizontal geometry and a setting that references vertical geometry apply to a portion of a corridor, the setting that results in a smaller interval is used. For example, if a segment is both a horizontal tangent and a vertical curve, and the vertical curve frequency adds assemblies at more frequent intervals, the frequency specified for vertical curves is used.

Adjacent To Offset Target Start/End

Specifies whether the assembly should be inserted adjacent to the offset target start and end. This setting creates stations at a small distance before the offset target start and after the offset target end, rather than creating the stations exactly at the offset target start and end. For more information, see About Changing the Frequency of Stations in a Corridor Region.

Along Offset Target Curves

Specifies how the frequency for inserting assemblies along offset target curves is determined.

By Curvature: Offset target curves are tessellated using the Mid-Ordinate Distance To Define Curvature value. Stations are created along the tessellated curve at each point where the tessellation touches the curve.
At An Increment: Stations are placed along the curve at the value specified in the Curve Increment field.

Curve Increment

Specifies the assembly insertion frequency along the curve portion of an offset target. Enter a value or click and select a distance in the drawing. This field is not editable if By Curvature is selected as the Along Offset Target Curves setting.

Mid-Ordinate Distance To Define Curvature

Specifies the value to define the mid-ordinate distance by which to tessellate offset target curves. This field is not editable if At An Increment is selected as the Along Offset Target Curves setting.

Options for Adding and Deleting Stations

: Adds a station. You are prompted to select a station location in the drawing. The station is added to the table of stations.
: Deletes the station selected in the table of stations.

Stations Table

The stations table displays the following columns:

Station: Displays the station value on the baseline.
Description: Specifies a description for the station. Click to enter a description.