Build Topology Network

Instructions for use

Generates a Network Dataset based on the specified Point Dataset, Line Dataset, or Network Dataset, which is used to Build a 2D Network.

Function entrance

  • Traffic Analysis tab-> Build Topology Network drop-down option-> Build 2D Network.

Operating instructions

  • Add Dataset

    • Support for building on Point Dataset, Line Dataset, and Network Dataset Click Add in the toolbar to add a Dataset for building a Network Dataset to the list box. The selected Dataset in Workspace Manager is automatically added to the list box. During the networking operation, only Line Dataset, or Point Dataset and Line Dataset can participate in the networking, but not only Point Dataset can participate independently.

  • Result Settings
    • Datasource: Data source of Result Dataset.
    • Dataset: used to save the generated Network Dataset. The name of the Result Dataset can be modified here.
    • Result Field: Click the Fields Settings.. "Button to pop up the Select Fields" dialog box as shown in the following figure.

      In the Select Fields "dialog box, the user fields (Non-system Field: and SmUserID field) of all the points and Line Dataset participating in the construction of the Network Dataset are displayed. The selected Select Fields will be assigned to the newly generated Network Dataset. The Attributes of the point object participating in the construction of the Network Dataset will be assigned to the corresponding network node in the Network Dataset. The Attributes of the line object involved in the construction of the Network Dataset will be assigned to the corresponding network arc segment in the Network Dataset, and other System Fields of the Network Dataset will be automatically assigned by the system.

  • Split Settings...
    • Split Line by Point: When the check box is selected, the line object is broken at its intersection with the point within the tolerance range. If the end point of the line object intersects with the point, the line is not broken.
    • Split Lines at Intersection: When this check box is selected, two (or more) intersecting line objects are broken at the intersection within the tolerance range. If the line object intersects with the endpoint of another line, the line object is broken at the intersection. In addition, when the "Split Lines at Intersection" "operation is checked, the" Split Line by Point "" will be checked by default, that is, the "Split Lines at Intersection" "function cannot be used alone.
    • Break Tolerance: Set the break tolerance. The break tolerance here is the node tolerance, which represents the minimum distance between line objects and between line objects and point objects. For example, if the node of a line object is within tolerance from the node of another line object, the two nodes are considered to be coincident; if the node of a line object is within tolerance from a point object, the point is considered to be on the line.

      Tolerance defaults are related to the Dataset's coordinate system and are described in the tolerance description .

      Note: The tolerance needs to be set to a reasonable value. When the tolerance value is set too large, the line will capture the points within the tolerance range. At this time, if a line object captures multiple head and tail nodes, the redundant point objects will be removed as duplicate points. The head and tail nodes captured by the end of the line may not be the correct points. At the same time, other line object nodes may be missing, and the generated Network Dataset is wrong. Causes Network Analysis results to be incorrect or Network Analysis to fail.

Caution:
  • If there are duplicate lines in the Line Dataset used to Build 2D Network data, when performing Network Analysis on the successfully built Network Dataset, The Output Window will prompt "Errors on network edges XXX analysis The execution is failed.", and the Network Analysis operation cannot be executed correctly. It is recommended that you perform Topology Processing and Remove Duplicate Lines on the Line Dataset before building the Network Dataset, so as to ensure that the Network Dataset is built correctly.
  • If more than one Point/Line Dataset contains fields with the same field name but different value domains, only the Domain Infor of the field in the first Dataset is kept in the Result Field.