Spatial Thinking in Planning Practice: An Introduction to GIS

26 % Support topological relationship queries and navigation (for example, to provide the ability to identify adjacent and connected features, !nd the shared edges, and navigate along a series of connected edges). % Support sophisticated editing tools that enforce the topological constraints of the data model (such as the ability to edit a shared edge and update all the features that share the common edge). % Construct features from unstructured geometry (e.g., the ability to construct polygons from lines some- times referred to as “spaghetti”). "is chapter material has been collected from the following web links that holds information with CC copy- rights: use and share alike. https://www.e-education.psu.edu/geog160/node/1948 http://webhelp.esri.com/arcgisserver/9.3/java/index.htm#geodatabases/topology_basics.htm Discussion Questions 1. How does the topology change as you change the features of a map – for example, when you introduce a road into a landscape? 2. Consider the role of the planner in understanding topology. In what ways does the concept of topology apply to the practice of planning? 3. What are examples of topological errors that may be present in a dataset, perhaps one that you received second-hand? Contextual Applications of Chapter 3 Metropolitan Jobs Recovery? Not Yet (Brookings) Job growth Chapter 3: Topology and Creating Data