Creating new faces

If, for a network object, you want to specify a boundary polygon, which consists of several faces, you can create further faces (Fundamentals: The surface data model in Visum).

1. Mark the desired network object (Marking network objects in the network).

2. Right-click in the network display.

3. From the context menu, choose New face.

4. Create a new face with consecutive mouse-clicks (Creating a boundary).

The edges of the boundary polygon are displayed as a rubber band. The hatching and the arrows indicate the direction of the face.

Note: Depending on the direction in which you create the polygon points, the face either belongs to the total surface or is cut out off another face (hole).

If you insert the polygon points in a counterclockwise direction, the face is part of the total surface, i.e. a so-called positive face is created (Fundamentals: The surface data model in Visum).
If you insert the polygon point in a clockwise direction, the face is subtracted from the other face, i.e. a so-called negative face is created. You can only create a negative face within an existing face (Fundamentals: The surface data model in Visum).

5. To confirm the definition of the face, press Enter.

The new face is created.

6. Create further faces, if required.

7. Confirm with OK.

Depending on the network object type, the following applies:

In case of zones, territories, and polygonal POIs, the new boundary is created and the step ends here.
For main nodes, main zones and restricted traffic areas a query opens in some cases. Proceed with the next step.

8. Confirm with Yes.

The partial network objects (nodes, zones or links) that lie within the boundary are allocated to the higher-level network object (main node, main zone, or restricted traffic area) and the new boundary is applied.

Note: If you want to create the main node, the main zone, or the restricted traffic area with a boundary but without allocated partial network objects, click No in the query. You can also allocate the partial network objects later (Allocating nodes to one or multiple main nodes and Editing main node attributes in the list view).