Does a geodatabase have topology?

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.

Which rule requires a line to touch lines from the same layer at both endpoints?

Must Not Have Dangles Requires that a line feature must touch lines from the same feature class (or subtype) at both endpoints. An endpoint that is not connected to another line is called a dangle.

What is topology in geodatabase?

A geodatabase topology is a set of rules and properties that defines the spatial relationships you want to model and preserve in your data. ArcGIS includes over 20 topology rules from which you can choose. All feature classes participating in a geodatabase topology must be in the same feature dataset.

What are the rules of topology?

Geodatabase topology rules and fixes for polyline features

• Must Be Larger Than Cluster tolerance.
• Must Not Overlap.
• Must Not Intersect.
• Must Not Intersect With.
• Must Not Have Dangles.
• Must Not Have Pseudo Nodes.
• Must Not Intersect Or Touch Interior.
• Must Not Intersect Or Touch Interior With.

How do you create a geodatabase topology?

Creating a topology using the Catalog window or ArcCatalog Right-click the feature dataset to which you want to add a topology, point to New, then click Topology. Click Next. Name the new topology and specify the cluster tolerance. The default value will be set to the x,y tolerance of the feature dataset.

What is the difference between map topology and geodatabase topology?

Unlike geodatabase topologies, map topologies are not stored permanently or represented as layers in the map. Map topologies have no rules and there is no validation process. The tools and commands for validating topology and fixing errors are disabled in the Topology toolbar when you work with a map topology.

How do you set topology rules in Arcgis?

Create a topology using the Create Topology wizard

1. In the Catalog pane, right-click the feature dataset to which you want to add a topology and click New > Create Topology.
2. Name the new topology and specify the cluster tolerance.
3. Check the boxes of the feature classes that will participate in the topology.

What are topology errors?

Topological errors violate relationships. that are defined by the user or required. by a GIS package.

How is topology used in GIS?

Topology expresses the spatial relationships between connecting or adjacent vector features (points, polylines and polygons) in a GIS. Topological or topology-based data are useful for detecting and correcting digitising errors (e.g. two lines in a roads vector layer that do not meet perfectly at an intersection).

What are topology rules in GIS?

Topology rules allow you to define those relationships between features in a single feature class or subtype or between two feature classes or subtypes. Topology rules allow you to define the spatial relationships that meet the needs of your data model.

Why topology is important in GIS?

Why topology? Topology has long been a key GIS requirement for data management and integrity. In general, a topological data model manages spatial relationships by representing spatial objects (point, line, and area features) as an underlying graph of topological primitives—nodes, faces, and edges.

How does geodatabase topology differ from map topology?