Alignment Station Equation Options

Use these options to define an alignment's station equation values. They are available on the Station Eqn tab of the Alignment Editor.

Note: The input modes are defined in Project Settings, which can be accessed by clicking the Project Settings icon in the editor.


Options
Station Equations
Back	Type a station back/downstation value.
Ahead	Type a station ahead/upstation value.
Station Zones (computed)
Zone	Denotes the section from one station to the next. The zone number also appears after the colon in the Start Station and End Station values.
Start Station	Shows the station at which the zone begins. The first station segment's value is derived from the Horizontal tab's POB station. To base alignment stationing on a different alignment: Use reference alignment stationing to apply stationing based on the stationing of another alignment (usually where a design alignment is slightly different from the as-built alignment). Specify the station value at the end of the POB segment. For other segment types, this either displays the computed station or requires a station to be entered, depending on the input mode. To base alignment stationing on a different alignment: Use reference alignment stationing to apply stationing based on the stationing of another alignment (usually where a design alignment is slightly different from the as-built alignment). Select the main alignment and press [F11] to open the Properties pane. Find the Appearance section and select the reference alignment that has the stationing you want to use in the Reference Alignment list. Note: The stationing shown in the Alignment Editor does not change when based on a reference alignment. Tip: You can confirm the use of a reference alignment's stationing by selecting the main alignment, right-clicking in any Coordinate control (such as used, e.g., in Pan Precise), selecting Offset > Offset Line snap, picking the main alignment, and moving your cursor along the main alignment. The rubber-band line will be perpendicular to the alignment based on the stationing of the reference line, not its own stationing. In this simplified example, notice how the rubberband line is perpendicular to the lower reference alignment, not the main alignment above it.
End Station	Shows the station at which the zone ends.
Progression	Indicates whether the station value increases or decreases after the station equation.