Polygonal accompanying axis

Polygonal accompanying axis are created in reference to an existing axis like accompanying axis.

The distances in the ground plan are defined in form of a table which describes the respective distances to the reference axis for the local stations of the accompanying axis.

The geometry in the elevation plane follows the selected or defined profile (e.g., profile of the reference axis, own profile, or profile from the terrain model.

Based on this geometric data, the polygonal axis is calculated as 3D spline.

Polygonal accompanying axes are especially suitable for defining accompanying structures like noise protection walls and similar.

Different from “normal” accompanying axes, the stationing of polygonal accompanying axis is referred to the accompanying axis itself.

When defining the table, the column X defines the local station on the accompanying axis and the column Y the distance (orthogonally) to the reference axis at this station. The third column (transition) has no relevance in this case. The local station in the column X of the table always starts at zero (=starting station of the accompanying axis). That means, the local stations correspond to the summed lengths of the particular sections of the polygonal accompanying axis (measured in the ground plan).

To create a polygonal accompanying axis

1. Right-click on the entry of the axis which should serve as reference for the accompanying axis and select New Polygonal Accompanying Axis from the context menu.

   A new polygonal accompanying axis is created in the menu Axis in the navigation tree.

2. Optionally, edit the name and confirm with the enter key.
3. Move the mouse in the View window to specify the desired first station (begin or end) of the accompanying axis related to the reference axis, and confirm it with a mouse click.
4. Move the mouse in the View window to specify the desired second station (begin or end) of the accompanying axis related to the reference axis, and confirm it with a mouse click.
5. Define the following parameters for the accompanying axis in the opening input window or later in the Property window:

Profile

Select an existing profile of the referenced main axis from the drop-down list or leave the field empty for now to define a profile afterwards.

Start Station

If applicable, adapt the previously selected start station.

End Station

If applicable, adapt the previously selected end station.

Offset Table

Select the table from the drop-down list in which the stations and distances of the accompanying axis are defined. You can as well leave this field empty for the moment and perform the assignment of the table afterwards in the property window.

Mirror Offset Table

The defined Y-values of the assigned offset table are considered with opposite sign (e.g., to use an existing table also for the other side of the reference axis).

Stations of Polygonal Axis / Stations of Reference Axis (Output)

Output the stations of the polygonal axis (abscissa) with the corresponding stations on the reference axis (ordinate) and vice versa into a table (which is also created in the menu Variations).

The names of the tables must be defined here or (if they already exist) selected from the drop-down list. In case the tables don't exist yet, they are automatically created during the calculation.