Network Topology Analysis - Resistance and Direction dialog box

NoteThis functionality applies only to drawing objects.

Use this dialog box to specify how to determine resistance for links and nodes and to specify how to determine the direction of link objects for the network analysis.

 To perform a shortest path traceTo perform a best route analysisTo perform a flood trace Click Analyze tabDrawing Object panelNetwork Analysis. At the Command prompt, enter mapantoponet.
Direction

Specify how to determine the direction of link objects for the analysis.

Enter a value or enter the location of the data to use to determine the direction of the links. To select the location of the data from a list, click Expression Builder. Select the data to use. You can also enter any valid expression. See Expression Evaluator. If you leave the box blank, bi-directional (0) is used.

If the expression evaluates to... Link Direction is...
0 or a character Bi-directional>
A positive number The physical direction
A negative number The reverse of the physical direction
Reverse

Select this option to use the reverse of the direction indicated in the Link Direction field.

Resistance

Specify how to determine resistance for links and nodes. Enter the location of the data to use to determine the direct resistance and reverse resistance of link objects and the resistance of nodes. To use values in an object data table or external database, click Expression Builder. Select the data to use. You can also enter any valid expression.

• Link Direct Resistance — Specify the resistance to travel in the direction that a link was created. If you leave the box blank, the length of the line (.LENGTH) is used.
• Link Reverse Resistance — Specify the resistance in the opposite direction along a link. If you leave the box blank, the length of the line (.LENGTH) is used.
• Node Resistance — Specify the resistance to cross the node, for example, resistance for a valve in a pipe network, or a junction in a road network. If you leave the box blank, zero (0) is used.
• Specify a minimum and maximum resistance for the trace.
TipThe best route cannot be be calculated if the network topology contains negative resistance values or if all resistance values equal zero (or use expressions that evaluate to zero). If all resistance values equal zero, every route is as good as another, and there is no "best route."

Use settings that you previously saved.

Save

Save the current settings so you can use them again.

Cancel

Close the dialog box without performing the network analysis.

Back

Display the previous dialog box.

Next
Finish

Perform the network analysis using the current settings.