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Topology problems when editing in ArcMap

Topology problems created by the Topology Edit tools

  • Moving a shared node of a polyline dataset using the standard Topology Edit Tool creates topology problems (dangling nodes) between the reshaped polylines and their neighbors

 

The indicated node is to be moved with the Topology Edit Tool. The green dots indicate that correct topological relationships exist between the polylines before moving the node After moving the node - the red dots indicate that dangling nodes are introduced as a result When zoomed to the indicated area the destroyed topology can be visualized.

See video illustrating the problem

  • Moving a shared node of a polygon dataset using the standard Topology Edit Tool creates topology problems (gaps or overlaps) between the reshaped polygons and their neighbors

The indicated node is to be moved with the Topology Edit Tool. After moving the node When zoomed to the indicated area the gap created can be visualized.
  • Modify Edge task creates dangling nodes when used on a polyline dataset and gaps or overlaps when used on a polygon dataset

See example below

  • Reshape Edge task creates dangling nodes when used on a polyline dataset and gaps or overlaps when used on a polygon dataset

The indicated edge is to be reshaped using Topology ==> Reshape Edge task After reshaping the edge Zooming in to the indicated area shows that a gap in the data has been created

ET GeoTools offers editing tools that will perform similar actions, but will preserve the correct topological relations  between adjacent  features

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Copyright: Ianko Tchoukanski