Creating a Network Topology
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Network topology defines the interconnection of links and, optionally, nodes at link junctions. Networks may contain loops. Network segments have a specified direction. Links can be lines, open polylines, or arcs. You can use information from different layers to define a network topology.

If you plan to use the network topology for direction analysis, you can use PEDIT to join a series of objects with the same flow direction into one object with nodes at each vertex. The directions derived from arc objects might be arbitrary; to control and edit these directions easily, use PEDIT to join segments with the same direction.

When you create the network topology with nodes at each intersection, the nodes do not significantly increase file size. You can use the nodes for path traces, best route analysis, and flood traces.

Object Data for Network Topology

Network topology information is stored on the links and nodes as object data. Each element of the network topology has different object data values.

Topology Name Object Data Table Object Data Field
SAMPLE_NET TPMLINK_SAMPLE_NET ID
    START_NODE
    END_NODE
    DIRECTION
    DIRECT_RESISTANCE
    REVERSE_RESISTANCE

By default, each link is bidirectional. Both resistance and direction are stored as object data. You can edit both direction and resistance values.

If you create nodes when you create the network topology, the object data table for each node has the following information.

Topology Name Object Data Table Object Data Field
SAMPLE_NET TPMNODE_SAMPLE_NET ID
    RESISTANCE

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