1. Topology Rules Illustrated Source: ESRI topology_rules_poster.pdf See also: ESRI White Paper, Working with Geodatabase Topology, March 2003 ESRI, ArcGIS 9: Editing in ArcMap, especially Chapter 4 Editing Topology (this book is considerably improved over the ArcGIS 8 version)

2. Within one line feature class 1 3 7 5 4 2 8 6

3. Between a point and a line feature class Between two line feature classes Between a line and a point feature classBetween a line and a polygon feature class 9 1413 1211 10

4. Within one polygon feature class 1516

5. Between two polygon feature classes 17 21 2019 18

6. Between a polygon and a point feature class Between a polygon and a line feature class All lines and polygons Between a point and a polygon feature class 22 26 2524 23 Note: numbers are mine, not ESRI’s!

7. Example of errors generated from the Polygons must not overlap with (#19) rule. Building footprints (in blue) must not overlap easements (in magenta). The violation areas are shown in yellow. The table shows the error report. User must make the decision whether these are: --accuracy issues with one or other layer (more likely the footprint layer) --thus fix through editing. --or violations where buildings have been built in easements --thus mark as “exceptions’ Example of Use of Topology Rule Source: ESRI Working with Geodatabase Topology p.9