ARCGIS GEODATABASE TOPOLOGY RULES PDF

Geodatabase topology rules allow you to define relationships between features in the same feature class or subtype or between two feature classes or subtypes. The status of a topology, including errors and exceptions, is saved to the source geodatabase. In the Contents pane, geodatabase topology rules appear as group layers containing sublayers that symbolize modified areas, and errors organized by geometry type. This topic explains the topology rules available for polygon features and their predefined fixes.

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Geodatabase topology rules allow you to define relationships between features in the same feature class or subtype or between two feature classes or subtypes. The status of a topology, including errors and exceptions, is saved to the source geodatabase. In the Contents pane, geodatabase topology rules appear as group layers containing sublayers that symbolize modified areas, and errors organized by geometry type.

This topic explains the topology rules available for polygon features and their predefined fixes. For steps to validate a geodatabase topology and fix errors, see Validate and fix geodatabase topology.

The cluster tolerance is the minimum distance between the vertices that make up a feature. Vertices that fall within the cluster tolerance are determined to be coincident. This rule is mandatory for a topology and applies to all polygon feature classes. Any polygon feature that would collapse when validating the topology is an error. Features that violate this rule are left unchanged. Delete Feature removes polygon features that would collapse during the validate process based on the cluster tolerance.

Requires that polygons must not overlap within a feature class or subtype. Polygons can be disconnected, touch at a point, or touch along an edge. Use this rule to make sure that no polygon feature overlaps another polygon feature in the same feature class or subtype, for example, when administrative boundaries such as ZIP Codes or voting districts, or mutually exclusive area classifications such as land form types cannot have any overlaps.

Polygon errors are created from areas where polygons overlap. Remove Overlap removes the overlapping geometry from the feature causing the error. You can choose the feature to preserve or apply the fix to all errors. Create Feature creates a new polygon feature from the error shape and removes the portion of overlap from each of the features.

The result is a planar representation of the feature geometry. Merge adds the geometry of one feature into the other feature causing the error. Requires that polygons must not have a void between them within a feature class or subtype.

Use this rule when all of your polygons should form a continuous surface with no voids or gaps, for example, when soil polygons cannot include gaps or form voids and must form a continuous fabric. Line errors are created from the outlines of void areas in a single polygon or between polygons boundaries that are not coincident with other polygon boundaries.

Create Feature creates new polygon features using a closed ring of the line error shapes that form a gap. If you select two errors, the result will be one polygon feature per ring. Polygons of the first feature class or subtype must not overlap polygons of the second feature class or subtype. Use this rule when polygons from one feature class or subtype should not overlap polygons of another feature class or subtype, for example, when lakes and land parcels from two different feature classes must not overlap.

Polygon errors are created where polygons from the two feature classes or subtypes overlap. The polygons in the first feature class or subtype must be covered by the polygons of the second feature class or subtype. Use this rule when each polygon in one feature class or subtype should be covered by all the polygons of another feature class or subtype, for example, when states are covered by counties. Polygon errors are created from the uncovered areas of the polygons in the first feature class or subtype.

Create Feature creates a new polygon feature out of the portion of overlap from the existing polygon so the boundary of each feature from both feature classes is the same. All polygons in the first feature class and all polygons in the second feature class must cover each other. This means that feature class one 1 must be covered by feature class two 2 , and feature class two 2 must be covered by a feature class of feature class one 1.

Use this rule when you want the polygons from two feature classes or subtypes to cover the same area, for example, when vegetation and soils must cover each other. Polygon errors are created where any part of a polygon is not covered by one or more polygons in the other feature class or subtype.

Create Feature creates a new polygon feature out of the portion of overlap from the existing polygon, so the boundary of each feature from both feature classes is the same. Polygons in one feature class or subtype must be covered by a single polygon from another feature class or subtype. Use this rule when you want one set of polygons to be covered by some part of another single polygon in another feature class or subtype, for example, when counties must be covered by states.

Polygon errors are created from polygons from the first feature class or subtype that are not covered by a single polygon from the second feature class or subtype. Polygon boundaries in one feature class or subtype must be covered by the lines of another feature class or subtype. Use this rule when polygon boundaries should be coincident with another line feature class or subtype, for example, when major road lines form part of outlines for census blocks. Line errors are created where polygon boundaries are not covered by a line of another feature class or subtype.

Create Feature creates a new line feature from the boundary segments of the polygon feature generating the error. The boundaries of polygons in one feature class or subtype must be covered by the boundaries of polygons in another feature class or subtype.

Use this rule when the boundaries of polygons in one feature class or subtype should align with the boundaries of polygons in another feature class or subtype, for example, when subdivision boundaries are coincident with parcel boundaries but do not cover all parcels.

Line errors are created where polygon boundaries in the first feature class or subtype are not covered by the boundaries of polygons in another feature class or subtype. A predefined fix is not available for this error.

Consider using tools in the Modify Features pane. Each polygon of the first feature class or subtype must contain within its boundaries at least one point of the second feature class or subtype. Use this rule to make sure that all polygons have at least one point within their boundaries.

Overlapping polygons can share a point in that overlapping area, for example, when school district boundaries must contain at least one school.

Polygon errors are created from polygons that do not contain at least one point. A point on the boundary of a polygon is also an error. Create Feature creates a new point feature at the centroid of the polygon feature that is causing the error. Each polygon must contain exactly one point. Each point must fall within a polygon. Use this rule to make sure that there is a one-to-one correspondence between features of a polygon feature class and a point feature class, for example, when parcels must contain exactly one address point.

Polygon errors are created from the polygons that do not contain exactly one point. Feedback on this topic? Skip To Content. Back to Top. Available with Standard or Advanced license.

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Geodatabase topology rules and fixes for polygon features

Use topology rules in ArcGIS:. If you answer yes to any of the following questions, you should consider using GIS topology rules to check to validate and fix errors in your GIS data. Topology checks and validates the spatial relationship of neighboring and overlapping features. For example, positional accuracy, digitizing error, data generalization and age of data are often sources of data error. Also, when you have two conflicting data sets, conflation edgematching and rubbersheeting resolves conflicts by preserving the most accurate one. Topology rules ensures connectivity between GIS datasets. It fills in gaps, removes slivers and fixes overlapping polygons.

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Geodatabase topology rules and topology error fixes

A geodatabase topology is another construct that is stored within a geodatabase and gives us added control over assessing and maintaining the integrity of our spatial data. A geodatabase topology provides a robust way of defining topological relationships among spatial features. It does so by analyzing coordinate locations of feature vertices both among features within a feature class and between features in multiple feature classes taking part in the topology. Therefore, it is not only important that all of the feature classes participating in a geodatabase topology be in the same coordinate system, but also that the measurement precision defined for each feature class be the same. To assure that this is the case, all feature classes that take part in a geodatabase topology must reside within what is known as a Feature Dataset.

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Geodatabase Topology (for ArcMap)

Geodatabase topology rules allow you to define relationships between features in the same feature class or subtype or between two feature classes or subtypes. The status of a topology, including errors and exceptions, is saved to the source geodatabase. In the Contents pane, geodatabase topology rules appear as group layers containing sublayers that symbolize modified areas, and errors organized by geometry type. This topic explains the topology rules available for polyline features and their predefined fixes.

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