Specifying settings for reading in additional network data

1. Open a version or network file.

2. Click the black triangle of the menu button.

The Select file type window opens.

3. Select Network and click OK.

The Open network window opens.

4. Select the file whose network data you want to read in.

5. Click the Open button.

The Read network window opens.

6. Make the desired settings for reading in files.

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. Then the loading is quicker. 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).
Display 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. Then the loading is quicker.
Show the 'Completing line routes' window	Select this option to open the window Read network (completing the courses of line routes/system routes) when reading in a file. Here you specify how Visum shall read incomplete line or system routes (Reading a network file with incomplete line routes or system routes).

7. Select the Read network file additively option.

More options will be available.

8. Make the desired changes.

Element	Description
Determine existing tables in advance	Select this option to check the network file you want to read in. Only the tables of this file are then displayed for table selection. If this option is not selected, all tables are available for selection.
Create warnings for conflicts in the "Ignore" mode	Select this option to show warnings about existing network objects when reading in files in the "Ignore" mode (Selecting data tables you want to read in). Deactivate this option if you do not want to show warnings about existing network objects when reading in files in the "Ignore" mode. Then the loading is quicker. Note To save warnings to a message file, in the warning settings, select Save warnings and details to the message file and in the log file settings, select Create new file (Specifying settings for protocol files).
Permit the deletion of objects	If this option has been selected, network objects in tables labeled $-<name of object type> will be deleted from the network. If this option has not been selected, tables that are labeled $-<Object type name> will be ignored.
Show statistics of modifications	Select this option to have Visum create a model transfer file while reading in a new file. The model transfer file contains all changes that are made according to the new file. The file is saved to the project directory specified for model transfer files, under the name <Current version name> - ReadNetwork.tra. It is automatically opened when it is read in.

9. Make the settings of your choice under Polygon handling after import.

Element	Description
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	Select this option to merge polygon points with the same coordinates. If this option is not selected, the polygon points are not merged. Notes 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 on (Merging all polygon points with identical co-ordinates).

Element

Description

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

Select this option to merge polygon points with the same coordinates.

If this option is not selected, the polygon points are not merged.

Notes

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 on (Merging all polygon points with identical co-ordinates).

10. Confirm with OK.

The Read network data additionally window opens. Select the data tables you want to read in.