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Add a topology and associated feature classes to ArcMap

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Now you’ll use the topology to help you find the dangle errors in the LotLines data. It is important to clean up this data before you create polygon features because only one lot polygon will be created if a line dividing two lots does not completely separate them.

You can drag and drop a topology from ArcCatalog onto ArcMap. When you do so, ArcMap allows you to add the feature classes that participate in the topology to ArcMap as well. In this example, the topology layer and the LotLines feature layer are added to the map.

The Topology layer shows all of the topology errors. Notice that in the ArcMap table of contents, the topology layer can show Area, Line, and Point errors. This topology only has one feature class and one rule, so all of the topology errors relate to that rule. The topology rule specifies that LotLines must not have dangles. The error geometry for dangles is a point, located at the dangling end of a line feature. All of the red error features on the map are dangles.


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