Single Feature Tracing Analysis

Instructions for use

According to the trend of the network, a set node or arc segment is tracked and analyzed.

Operation steps

  1. Open the Network Dataset for Network Analysis.
  2. On the Traffic Analysis tab, in the Facility Network Analysis group, select the Environment Settings check box to bring up the Environment Settings window. Set the Network AnalysisBasic Parameters (such as Weight Field, node/Edge ID Field, etc.), Analyst Result parameter, and Flow Direction Field of tracking analysis in this window. For an introduction to the Environment Settings window, see Network AnalysisEn vironment Settings window Page.
  3. Create a new instance of the Single Feature Tracing Analysis. On the Spatial Analysis tab, in the Facility Network Analysis group, click the Network Analysis Drop-down Button. Select Single Element Tracing from the drop-down menu that pops up. After the instance is successfully created, the Instance Management window automatically pops up. For an introduction to the Instance Management window, see the Instance Management window page.
  4. Click The Parameter Settings "button in the Network Analysis Instance Management window to pop up the Single Element Tracing Settings" dialog box. Set the Analysis Parameters.
    • Feature Type: Click the Feature Type drop-down arrow to select the feature type to be analyzed. Two types of nodes and arc segments are supported. When the element type is node, the network node is selected as the analysis element; otherwise, Select Edge is selected as the analysis element. The Context Menu in the Instance Management window does not support import and export when the feature type is arc.
    • Element ID: the ID field value of the analysis element. Corresponds to the Node ID Field and Edge ID Field in the Environment Settings window. See the Network AnalysisEnvironment Settings page for the Environment Settings window.
    • Analysis Type: Four Analysis Types are available:

      Trace Upstream: Start from the specified node (or arc segment) and find all the upstream paths of the node (or arc segment) according to the flow direction.

      Trace Down stream: Start from the specified node (or arc segment) and find all the downstream paths of the node (or arc segment) according to the flow direction.

      Find Source: Start from the specified node (or arc segment) and find the source point nearest to the node (or arc segment) according to the flow direction.

      Find Sink: Start from the specified node (or arc segment) and find the downstream sink that flows out of the node (or arc segment) according to the flow direction.

    • Loop Valid: Whether the network loop is involved in the analysis when setting the analysis. If this option is selected, the loop will participate in the tracking analysis; otherwise, it will not participate.
  5. Adds a node or arc segment to the current network layer. Add nodes or arc segments according to the feature type set in the previous step. Adding a node is similar to adding a site in Transportation Analysis, that is, you can use Add by Mouse or import it. Arc segments can only be added by means of Draw. See the Import Stops dialog box for details.

    Note: If you need to delete a node, you can select the "Node" directory node in the Instance Management window, and select "Remove" in the pop-up Context Menu or select the node to be deleted and press the Delete key.

  6. When all Parameter Settings are complete, Click the Execute button in the Facility Network Analysis group on the Spatial Analysis tab or the Execute button on the Instance Management window to perform the analysis. The Analyst Result is displayed immediately in the Map. Analyst Results can be Save as Dataset for use elsewhere.