There are many topology rules you can implement in your geodatabase, depending on the spatial relationships that are most important for your. Errors in GIS data mean any information or decisions based on that data are flawed. Geodatabase topology provides an automated, rule-based solution to. Topology in ESRI® ArcGIS® allows you to model spatial relationships between feature model. Topology errors are violations of the rules that you can easily.

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It is useful for combining two mutually exclusive systems of area classification, such as zoning and water body type, where areas defined within the zoning class cannot also be defined in the water body class and vice versa.

The top polygon is an error because it contains more than one point. This fix can be applied to one or more Must Not Self-Intersect errors. The top polygon is an error because it does not contain a point. The Delete fix removes point features that are not coincident with the endpoint of line features.

This is useful for ensuring that points are not coincident or duplicated within the same feature class, such as in layers of cities, parcel lot ID points, wells, or streetlamp poles. This is useful when the point features help support the boundary system, such as boundary markers, which must be found on the edges of certain areas.

This rule is used when an area cannot belong to two or more polygons. Many topology rules can be imposed on features in a geodatabase. This rule is useful for lines, such as contour lines, that cannot cross themselves.

Requires that points be separated spatially from other points in the same feature class or subtype. Using the Create Feature fix for this specific error can create overlapping polygons.


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Any line feature, such as these lines in red, that would collapse when validating the topology is an error. Requires that line features from the same feature class or subtype not cross or overlap each other. The squares are points that are not covered by the line. The Subtract fix removes the overlapping portion of geometry from each feature that is causing the error and leaves a gap or void in its place.

Lines can cross or intersect but cannot share segments. The point feature that is created is guaranteed to be within the polygon feature.

For example, roads must not overlap with railroads or depression subtypes of contour lines cannot overlap with other contour lines. This topic explains the topology rules available for point features and their predefined fixes. The Extend fix will extend the dangling end of line features if they snap to other line features within a given distance.

The Snap fix can be applied to one or more Must Coincide With errors.

Where the purple lines overlap is an error. Requires that the polygons of one feature class or subtype must share all of their area with the polygons of another feature class or subtype.

Geodatabase topology rules and topology error fixes—Help | ArcGIS for Desktop

Feedback on this topic? To view this document, you need a copy of Adobe Reader. This rule is useful where lines from two layers must only be connected at endpoints.

Polygon rules Line rules Point rules.

Requires that the interior of polygons not overlap. This fix can be applied to one selected Must Not Overlap error only. Use this rule when points within one feature class or subtype should never occupy the same space, for example, when fittings in a water distribution network should not overlap.

Boundary corner markers might be constrained to be covered by the endpoints of boundary lines. Requires that a line from one feature class or subtype not overlap with line features in another feature class or subtype.


You can either ignore this error or mark it as an exception. The Subtract fix creates multipart features, so if the overlapping segments are not at the end or start of a line feature, you might want to use the Explode command on the Advanced Editing toolbar to create single-part features. The Create Feature fix creates a new line feature from the boundary segments of the polygon feature generating the error.

The Subtract fix removes line segments that are not coincident with the boundary of polygon features. This is useful for cases where points must be covered by other points, such as transformers must coincide with power poles in electric distribution networks and observation points must coincide with stations.

This rule is used where line segments should not be duplicated, for example, in a stream feature class. This fix can be applied to one Must Not Intersect error only. This fix can be applied to one Must Not Overlap error only. This fix can be applied to one or more Must Not Intersect With errors. Some topology rules govern the relationships of features within a given feature classwhile others govern the relationships between features in two different feature classes or subtypes.

Topology rules can be defined between subtypes of features in one or another feature class. Requires that points fall on the boundaries of area features. Available with Standard or Advanced license. This rule is used when area features need to have line features that mark the boundaries of the areas.