[AM3-6] Adjacency and connectivity

Adjacency is the meet relationship as a topological property of a geographic object in relation ship with another. The adjacency operator identifies those features that share boundaries and, therefore, applies only to line and polygon features. This meet relationship is invariant under a continuous transformation and are referred to as a topological mapping.

External resources

• ITC (2013) The Core of GIScience: A Process-based Approach. ITC educational textbook series. 524 pages. ISSN 1567-5777. ISBN 978-90-3653-719-3.

Learning outcomes

• 146 - List different ways connectivity can be determined in a raster and in a polygon dataset
  List different ways connectivity can be determined in a raster and in a polygon dataset
• 147 - Describe real world applications where adjacency and connectivity are a critical component of analysis
  Describe real world applications where adjacency and connectivity are a critical component of analysis
• 148 - Explain the nine-intersection model for spatial relationships
  Explain the nine-intersection model for spatial relationships
• 149 - Demonstrate how adjacency and connectivity can be recorded in matrices
  Demonstrate how adjacency and connectivity can be recorded in matrices
• 150 - Calculate various measures of adjacency in a polygon dataset
  Calculate various measures of adjacency in a polygon dataset
• 151 - Create a matrix describing the pattern of adjacency in a set of planar enforced polygons
  Create a matrix describing the pattern of adjacency in a set of planar enforced polygons

Self assessment

Outgoing relations

• [AM3-6] Adjacency and connectivity subclassof [AM3] Geometric measures
• [AM3-6] Adjacency and connectivity subclassof [CF6-3] Topological relationships

Contributors

• Rob Lemmens
  University of Twente, Faculty of Geo-Information Science and Earth Observation (ITC)
  https://research.utwente.nl/en/persons/rob-lemmens