The Topology Properties dialog box lets you view the status and update the feature classes and rules associated with a topology.
To access topology properties, right-click the topology in the Catalog pane and choose Properties.
The Topology Properties dialog box has four tabs: General, Feature Classes, Rules, and Errors. Many of the tabs allow you to update the topology and edit properties. Any edits made to the topology will be committed once you click the OK button. If you want to discard your edits, close the Topology Properties dialog box or click the Cancel button.
The General tab of the Topology Properties dialog box contains the following information:
- Name—The name of the topology. You can update the name of the topology by clicking in the text box and making changes.
- XY Cluster Tolerance—Any two vertices that fall within a horizontal distance of the cluster tolerance are assumed to be at the same location. During topology validation, the vertices that fall within the cluster tolerance will be given the same x,y-coordinate. To update the XY cluster tolerance, click in the text box and type your changes.
- Z Cluster Tolerance—Any two vertices that fall within a vertical distance of the Z cluster tolerance are assumed to be at the same location. During topology validation, they will be given the same z-coordinate.
- Status—This section shows whether or not the topology has been validated and if there are dirty areas to examine.
Feature Classes tab
The Feature Classes tab shows the number of coordinate accuracy ranks and Z ranks in the topology and what rank is assigned to each participating feature class.
When you define a topology, you rank the feature classes within the topology to control how vertices are moved when they fall within the cluster tolerance of one another. Feature classes with a rank of 1 are considered to have the highest accuracy. Coordinate ranks allow you to ensure that reliably placed vertices are the anchor locations toward which less reliable vertices are moved during topology validation.
You can edit the total number of XY ranks and Z ranks by clicking in their respective text boxes and typing a new number.
To edit the XY or Z rank associated with a feature class, click in the column next to the feature class and type a new number. You cannot enter a number greater than the amount shown in the Number of XY Ranks or Number of Z Ranks text boxes.
Add or remove feature classes
The Feature Classes tab also allows you to add feature classes to or remove feature classes from the topology. To remove a feature class, highlight the feature class in the grid and click Remove. To remove every feature class from the topology, click Remove All.
Follow these steps to add a feature class to a topology:
- Click Add Classes.
This opens the Add Classes dialog box. This dialog box displays all of the feature classes in the feature dataset containing the topology that are not already participating in the topology.
- Choose which feature classes you want to add to the topology by clicking the check box beside the feature class name. You can select all available feature classes in the feature dataset by clicking Select All. Click Clear All to deselect all currently selected feature classes.
- Click OK to add the selected feature classes to the topology. Or you can click Cancel to exit out of the Add Classes dialog box without adding any feature classes to the topology.
Topology rules define the permissible spatial relationships between features. The Rules tab displays the topology rules defined on feature classes and subtypes participating in the topology.
To add rules to the topology, click Add or click in the last row of the grid where it says Click here to add a new rule. This creates an empty row. You can build a new rule between feature classes and their subtypes by using the drop-down menus in each column and filling out each cell from left to right to define the rule.
To remove a rule from the topology, select a row in the grid and click Remove.
The Errors tab offers a summary of errors and exceptions found in the topology. Similar to the Rules tab, the grid shows the topology rules and their participating feature classes and subtypes. The errors and exceptions associated with each topology rule are displayed on the right of the grid. Errors are generated when you validate a topology and a topology rule is violated. See Introduction to editing topology for more information.