Feature Description

Check whether loops exist in the network dataset.

In facility networks, a loop refers to a closed path formed by two or more arc segments with flow direction value 2 (i.e., undetermined flow direction). A valid loop must satisfy both conditions:

1. Consists of at least two interconnected arc segments forming a closed path.
2. All participating arc segments have flow direction value 2 (undetermined flow direction).

The diagram below shows a portion of a facility network, where different symbols represent flow directions. Two loops (highlighted in red) are detected through loop checking. The single arc with flow direction 2 in the upper right does not form a loop as it lacks interconnected arcs with the same flow direction value.

Steps

1. In the Environment Settings window, click the "Check Loops" button to open the Check Loops dialog.
2. In the Check Loops dialog:
   • Check "Save analysis results" to store results as a line dataset. Specify name and datasource location. Enabled by default.
   • Check "Highlight analysis result" to display detected loops in the current network dataset. Enabled by default.
3. Click OK to perform loop checking. Click Cancel to abort the operation.