Correcting or Completing a Topology
Concept Procedure Quick Reference

If parts of the topology are incomplete (not closed or only part of a polygon), they are marked and excluded from editing. Two examples of incomplete topologies created by queries are shown in the following illustration. The outer polygons in the grid are incomplete because their outside links are parts of polygons not included in the query.

If you use a location query to retrieve polygons, make sure that you use a Crossing window. If you are using data that is shared with other users, be sure that you load the topology to ensure that you are using current data.

Completing a Topology

When you complete a topology, AutoCAD Map 3D looks at the objects and object data in a drawing, and attempts to complete a network or polygon topology by retrieving further drawing objects, such as links and centroids referenced by the topology object data tables. Complex polygons, with one or more islands, must be fully represented, and all internal islands referenced by a polygon must be present for the option to work.

This option completes dangling edges in a network topology, and all incomplete areas in polygon topologies; however, it might fill islands as well.

Auditing and Recreating a Topology

When you audit a topology, AutoCAD Map 3D checks that a topology is complete and contains no errors. Any errors found are marked but are not fixed. Errors in a node topology are not marked.

To reestablish a topology that was edited with nontopology editing commands such as STRETCH and PEDIT, you recreate the topology; however, topology data might be lost. You can only recreate a topology in the current drawing; to recreate topology in an attached drawing, use a query to retrieve the geometry first. Load the topology before using recreate.

To modify the geometry of a topology (the nodes, links, or polygons), use the topology editing tools explained in Editing Topologies.

To create closed polylines for a non-AutoCAD Map 3D user, click Create tab Topology panel Create Closed Polylines. This also works when you are exporting data to an external file format that does not support topologies.

See Also