Creating a Polygon Topology
Concept Procedure Quick Reference
 
 
 

Polygon topology is an extension of network topology and focuses on area-based relationships. Every area forms a polygon; and each polygon in a topology consists of a set of links. A polygon in a topology has a centroid, which is a point or block element within the polygon, and contains information about the area it encloses.

A polygon in a topology consists of a centroid containing information about the surrounding links. Intersecting links can have nodes. A polygon can contain one or more islands.

You cannot create a polygon topology from ellipses or from closed polylines that share an edge or intersection with other polygons. You must explode a closed polyline before you create the topology. You can use information from different layers to define a polygon topology.

Object Data for Polygon Topology

Information about a polygon topology is held in the centroids and links. The object data table for each centroid has the following information.

Topology Name Object Data Table Object Data Field
SAMPLE_POLY TPMCNTR_SAMPLE_POLY ID
    AREA
    PERIMETER
    LINKS_QTY

The object data table for each link in a polygon topology has the following information.

Topology Name Object Data Table Object Data Field
SAMPLE_POLY TPMLINK_SAMPLE_POLY ID
    START_NODE
    END_NODE
    DIRECTION
    DIRECT_RESISTANCE
    REVERSE_RESISTANCE
    LEFT_POLYGON
    RIGHT_POLYGON

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

Topology Name Object Data Table Object Data Field
SAMPLE_POLY TPMNODE_SAMPLE_POLY ID
    RESISTANCE
See Also