Opening a network file

1. Click the black triangle of the Open button.

2. Select the entry Open file > Network.

The Open: Network window opens.

3. Select the desired file.

4. Click the Open button.

The Read network window opens.

5. Make the desired changes.

Element	Description
Show warnings on screen	Select this option to show warnings when loading files. If this option is not selected, no warnings are shown when you load files. This speeds up the loading process. Note If in the warning settings, you selected Save warnings and details to the message file and in the log files, you selected Message file: Create new file, warnings are saved to a message file (Specifying settings for protocol files).
Show error messages on screen	Select this option to show error messages when loading files. If this option is not selected, no error messages are shown when you load files. This speeds up the loading process.
Read network file additively	Select this option to read the network file in addition to the currently opened network. You can specify further settings (Reading network data additively). If this option is not selected, the network currently opened is closed and the network of the network file is opened.
Show the 'Completing line routes' window	Select this option to open the window Read network (completing the courses of line routes/system routes). Here you specify how Visum shall read incomplete line or system routes (Reading a network file with incomplete line routes or system routes).
Normalize created and modified polygons (self-intersecting test)	Select this option to normalize all newly added polygons and all polygons changed through the import process. If this option is not selected, no polygons are normalized. Notes Polygons have to be normalized if, for example, you require the area or want to intersect the polygons. You do not have to normalize polygons to e.g. only show them in the background (Fundamentals: Multi-part surfaces). You can also normalize polygons later on (Normalizing all surfaces).
Merge points with identical co-ordinates	This option is useful, e.g., when the polygon points represent a municipal border. If two polygons are merged, both polygons automatically change when shifting the polygon point. You can also merge polygon points later (Merging all polygon points with identical co-ordinates). Select this option to merge polygon points with the same coordinates. Number of decimal places Enter the desired number of decimal places. Two points are considered equal and combined if their coordinates are equal after they have been rounded to the specified number of decimal places. Notes The default value for the number of decimal places is the entry set in the network settings for Coordinates (Settings for decimal places, aggregation functions, and connecting journeys) Enter a negative value manually if you want the value from the network settings that exists after importing the network file to be used as a parameter when merging. If this option is not selected, the polygon points are not merged.

6. Confirm with OK.

Notes: If the Show the 'Complete line routes' window option has been checked, the Read network (completing the courses of line routes/system routes) window opens. Here you can specify how you want to add the data (Reading a network file with incomplete line routes or system routes).

Network objects from tables labeled $-<Name of object type> are ignored during the import (Creating a model transfer file).

The network file is opened and the network is displayed in the Network editor window. The name of the network file is shown in the title bar.