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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The square on the right indicates an error because it is a point that is not on the boundary of the polygon. If no feature is found within the distance specified, the feature will not be trimmed, nor will it be deleted if the distance is greater than the length of geodatabaae feature in error.

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

This fix can be applied to one or more selected Must Be Covered By errors. This is useful for ensuring that points are not coincident or duplicated within the same feature class, such as geodatabasf layers of cities, parcel lot ID points, wells, or streetlamp poles. Use this rule when you want points to be completely within the boundaries of polygons, for example, when state capitals must be inside each state.

This fix can be applied to one or more selected Must Cover Each Other errors. You can detect multipart features arcgs the Must Be Single Part rule. This rule is used for contour lines that should never cross each other or in cases where the intersection of lines should only occur at endpoints, such as street segments and intersections. The Ryles fix removes the overlapping portion of each feature that is causing the error so the boundary of each feature from both feature classes is the same.


Requires that arcgiss of polygon features must be covered by lines in another feature class.

ArcGIS Desktop Help – Topology rules

Requires that a line is contained within the boundary of an area feature. This rule is used when area features of a given type must be located within features of another type.

Each parcel might be defined by one or more line features that store information about their length or the date surveyed, and every parcel should exactly match its boundaries. This fix can be arcgie to one or more Topolgoy Not Have Dangles errors. Note that you can use the Geodxtabase tool and move the point inside the polygon feature if you do not want to delete it. Available with Standard or Advanced license. Requires that line features not cross or overlap themselves.

You can either ignore this error or mark it as an exception. If two lines cross at a single point, applying the Split fix at that location will result in four features.

This is useful when the point features are related to polygons, such as wells and well pads or address points and parcels. Remember that you can mark this error as an exception. This rule is used when there are lines from two layers that should never cross each other or in cases where the intersection of lines should only occur at endpoints, such as streets and railroads. This fix can be applied to one or more Must Be Single Part errors.

Geodatabase topology rules allow you to define relationships between features in the same feature class or subtype or between two feature classes or subtypes. This fix can be applied to one Must Not Intersect error only. 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.


The Snap fix will snap to the nearest feature found within the distance. One such arcgjs occurs with nested hierarchical datasets, such as census blocks and block groups or small watersheds and large drainage basins.

It searches for endpoints to snap to first, then vertices, and finally to the edge of line features within the feature class.

Geodatabase topology rules and topology error fixes

You need to pick the feature that receives the portion of overlap using the Merge dialog box. This rule is useful where line features, such as highways, may not have multiple parts. In instances where this rule is violated, the original geometry is left unchanged. Must Cover Each Other. 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 To;ology command on the Advanced Editing toolbar to create single-part features.

The Trim fix will trim dangling line features if a point of intersection is found within a given distance. Point errors are created where points from the first feature class or subtype are not covered by points from the second feature class or subtype. The Simplify fix removes self-overlapping line segments from the feature in error.

ArcGIS Pro

Lines can cross or intersect but cannot share segments. This fix can be applied to one Must Not Overlap error only. This is useful for modeling lines, such as lot lines, that must coincide with the edge of polygon features, such as lots.