Adding and Exporting Topologies

To access the Topologies page, open the lower app bar and select Data > Topology.

The Topologies page shows the topologies that exists on the data, the classes that take part in each topology, and the topology's snapping tolerance. From here you can select an existing topology or create a new topology.

     Note: You can create a topology in an empty dataset to save a project as a template and distribute it to users. The topology definition will then be present by default for all new projects for these users. Building topology for an existing set of data is an intensive process which may take some time.

ClosedCreate a new Topology

  1. Open the lower app bar and select Data > Topology.

  2. Select the required topology type (planar, end-connected, or T-connected), specify a unique topology name then click Ok.

    The new topology is created.

  3. Enter a default snapping tolerance for the topology in the Default Snapping Distance field. Points or edges in features that are closer than this tolerance will snap together and share.

  4. Click Add Class.

    Select one or more classes to take part in the topology and click .

ClosedModifying a Topology

You can select a class and remove it from the topology if the topology has been torn down using Add Class and Remove Class. Once you have created or modified a topology, click Build Topology in the lower app bar to populate the topology from any existing loaded data, then click Yes.

     Note: When you add a class to a topology, you can only add the primary geometry of a feature to a topology. Adding a secondary geometry to a topology is not supported.

Tearing Down a Topology

Tearing down a topology causes all the topology primitives to be removed, ready to be rebuilt by a build topology task. This is useful if you have changed the tolerance or the classes within a topology.

You cannot delete a topology, however, you can remove all classes from a topology to render it inactive.

Import and Export a Topology

ClosedImporting a Topology

  1. Open the lower app bar and select Data > Topology.

  2. Open the topology lower app bar and select Import Topology.

  3. Use the file explorer to select a topological definition as produced from an Export Topology to import.

ClosedExporting a Topology

    You can also export a topological definition to share between projects. This avoids the need to re-define topologies by hand.

  1. Open the lower app bar and select Data > Topology.

  2. Open the topology lower app bar and select either Export Selected to export the topology you have selected, or select Export All Topologies to export all topologies currently loaded to the project.