# Types of Topology Rules Governing Points, Lines, and Polygons on Points Lines, and Polygons (Especially for GATE-Geospatial 2022)

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There are many topology rules you can implement in your geodatabase, depending on the spatial relationships that are most important for your organization to maintain. There are three topology rules are given:

## 1. Points

### Points on Lines

• Must be covered by endpoint of point must be covered by line.
• Use this rule when you want to model points that are coincident with the ends of lines.
• Use this rule when you want to model points that are coincident with lines.

### Points on Polygons

• Must be properly inside polygons must be covered by boundary
• Use this rule when you want points to align with the boundaries of polygons.

## 2. Lines

### Lines on Points

• Endpoint must be covered

### Lines on Lines

• Must not overlap with
• Must be covered by feature class

### Lines on Polygons

• Must be covered by boundary

## 3. Polygons

### Polygons on Points

• Contains point
• 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.

### Polygons on Lines

• Boundary must be covered by

### Polygons on Polygons

• Must be covered by feature class
• 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.
• Must not overlap with
• Use this rule when polygons from one feature class or subtype should not overlap polygons of another feature class or subtype.

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