Importing ANM data

You can export from Visum as of Visum 10 data abstracted network models (ANM files) in XML format, or create ANM files with other programs. The abstract network models in ANM files consist of nodes and edges. You have the following options to import ANM data:

• Select ANM file, configure data import and start data import (Selecting ANM file, configuring and starting data import)
• Adaptive import of ANM data (Adaptive import of ANM data)
• In Visum, use the subnetwork generator to generate a subnetwork. Open Visum directly from Vissim and import the subnetwork into Vissim. For further information, refer to the Visum manual.

Properties of the network generated

When you import ANM files into Vissim, a new Vissim network, with the geometry of links and connectors, is generated. Optionally, nodes can contain additional elements, for example, lanes, lane turns, crosswalks, pockets, control types, signalizations and detectors with the determined vehicle classes (Generated network objects from the ANM import).

Notes:   The ANM import only generates segment nodes. For the editing in Vissim, you can convert segment nodes into polygon nodes (Converting segment nodes). You can also import files which have been exported from SITRAFFIC OFFICE.

Volumes and routing are defined in *.anmroutes files and can be imported in Vissim. This allows you to use this data in the dynamic assignment or as static routes.

Projection in ANM data

If a projection is specified in ANM data, the ANM coordinates are converted into Cartesian coordinates.

If no projection is specified:

• A message is displayed, saying that no projection was recognized.
• ANM coordinates are interpreted as Cartesian coordinates.
• ANM coordinates are not converted.

Information on data for dynamic assignment

Origin-destination matrices and a Path file *.weg are generated.

Notes:   The route volumes in a path file, which are generated via an ANM import, must not be in whole numbers because the result of the assignment with Visum can have decimals. During export, the route volumes of the dynamic assignment are located in the path file as volume per ANM time interval. During import, they are recalculated in volumes per evaluation interval of the dynamic assignment. For the dynamic assignment, these values are randomly rounded in Vissim. This rounding is effected depending on the rounded share. For random rounding, the sum of the matrix values remain somewhat constant. Example: There is a 30% chance that 0.3 is rounded to 1 and a 70% chance it is rounded to 0. Node routes are not imported.

Information on data for static routes

• Vehicle inputs and routing decisions with static routes are generated.
• Each routing decision for static routes contain a name, which contains the number of the ANM origin zone.
• The unique IDs of the ANM routes are taken over as routing numbers from static routing decisions. These routes can be found in the *.anmroutes file and the respective OD relation is determined.

Information on data for mesoscopic simulation

To perform a mesoscopic simulation after ANM data import, in the ANM import window, in the Dynamic Traffic Data section, select Dynamic assignment.

You also need to select this option when importing only one *.anm file without any routes and/or matrices. This way you ensure that the zones and/or parking lots as well as nodes of the network object type Node are generated.