PTV Visum - Frequently Asked Questions (FAQs)

(#VIS12685)

How can I merge neighboring Zones or Territories?

1) Export the Zones or Territories as network file. Use 'frequent cases' to select all necessary tabels.
2) Open this network file with an editor and delete one of the Zones or Territories. In the table 'Surface items' the respective Faces have to refer to the same Surface. Opening this network file, Visum will merge the Zones or Territories. The points and edges of the common border will be removed by the 'normalizing' process.

Two adjacent Zones or Territories (with a common boundary) are defined in the network file as follows:

*
* Table: Surface items
*
$SURFACEITEM:SURFACEID;FACEID;ENCLAVE
1;1;0
2;2;0

*
* Table: Zones
*
$ZONE:NO;XCOORD;YCOORD;SURFACEID
1;98.9542;93.1333;1
2;140.7583;73.8187;2

If you simply delete the second zone and specify in the table Surface items that both Faces belong to the same Surface item, PTV Visum will merge both zones after opening the network file.

*
* Table: Surface items
*
$SURFACEITEM:SURFACEID;FACEID;ENCLAVE
1;1;0
1;2;0

*
* Table: Zones
*
$ZONE:NO;XCOORD;YCOORD;SURFACEID
1;98.9542;93.1333;1