VISSIM 5.30-05 User Manual

6.2.1.5 Adaptive ANM Import
Data Import/Export
The adaptive ANM Import should be called only for a VISSIM network that
has been originally created by means of an initial ANM Import.
In contrast to the initial ANM Import, the Adaptive ANM Import works as
follows:
The initial ANM data which was saved by VISSIM during the initial ANM
import is kept independently of manual refinements in the VISSIM network.
During an adaptive ANM Import VISSIM compares the new ANM data with
the saved initial ANM data and uses only the differences between the two
data sets to adapt the VISSIM network accordingly. If a node has been
changed in the ANM file only this node and the connected edges are created
from scratch by the adaptive import, thus only manual geometry
improvements in this (small) part of the network will get lost. All manual
modifications of the VISSIM network in nodes (and edges) that are not
affected by the changes in the ANM file remain intact, however, as do
VISSIM network objects that have been added only in the VISSIM network
editor.
Adaptive ANM Import allows for:
► Exporting changes to the original VISUM network into a previously
exported VISSIM network which has been refined manually in the
meantime without losing much of the work in the VISSIM network editor.
► Loading a different demand scenario (matrix and assignment result) from
VISUM - in this case the VISSIM network remains completely unchanged
(unless a necessary parking lot or route need to be added).
Routing data is imported adaptively only if the routes to be imported have
been changed, i.e. if the *.ANMROUTES file has been changed.
If the routes have been changed manually in VISSIM and the original
*.ANMROUTES files shall be imported again, initial ANM import has to
be used: Select only routing for import. Then, the network will remain
unchanged.
Starting the adaptive import also runs an additional check of the VISSIM
nodes. If a VISSIM node matches with an ANM zone it will be checked
whether the current edge structure complies with the internal ANM
attributes (IDs of the ANM zone connector) of the node.
The node geometry cannot be restored if only node name or/and the link
name and/or the link behavior type have changed.
In case of changes to name or type, the reconstruction of the node
geometry is forced on purpose in case of two parallel links between two
nodes.
Starting the Adaptive ANM Import
Call FILE – IMPORT… - ANM ADAPTIVE to open the ANM Import Adaptive
window.
User Manual © PTV AG 2011 173