Contents
What are the topology rules available to find errors for a polygon feature class?
Geodatabase topology rules and fixes for polygon features
- Must Be Larger Than Cluster tolerance.
- Must Not Overlap.
- Must Not Have Gaps.
- Must Not Overlap With.
- Must Be Covered By Feature Class Of.
- Must Cover Each Other.
- Must Be Covered By.
- Boundary Must Be Covered By.
What is planar topology?
Planar topology uses face primitives in addition to nodes and edges to describe two-dimensional areas on a map. A face is formed within every closed set of edges. The example below shows how areas in an imaginary land parcel can be described in terms of nodes, edges and faces.
What is a GIS topology?
Today, topology in GIS is generally defined as the spatial relationships between adjacent or neighboring features. Mathematical topology assumes that geographic features occur on a two-dimensional plane. In GIS, topology is implemented through data structure.
How are polygon errors created in geodatabase topology?
Polygon errors are created from the uncovered areas of the polygons in the first feature class or subtype. 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.
Are there any predefined fixes for Topology rules?
Some topology rules, however, have no predefined fixes. Once you have discovered the topology errors, you can select the error on the map with the Fix Topology Error tool , or select the error from within the Error Inspector. For a poster of the available topology rules and examples of them, see the ArcGIS Geodatabase Topology Rules PDF.
How to check polygon topology error in QGIS?
Checking Polygon Topology Error 1 Add polygon layer to QGIS. For this tutorial I used building polygon. 2 Click Topology Checker plugin. In the panel click Configure. The Topology Rule Settings window will appear as in… 3 Click Validate, and then the error will appear and marked with red color as in figure 10. More
What are the rules for topology in ArcGIS?
For a poster-size PDF file listing all topology rules, see ArcGIS Geodatabase Topology Rules. 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.