Step by step guide 

This tutorial was developed using common errors with  COD-AB. The techniques to used to inspect and correct data can be applied to other datasets with their own elements in mind.  

The following topics are discussed:

• Inspecting data for topological errors
• Creating an error report
• Fixing topology errors (gaps, overlaps) 
• Creating higher admin levels from the lowest level available

Resources

• Topology Correction in AcrGIS the step by step guide
• Data identified in the Correct Topology Tutorial: (note that it was manually altered to have errors in it for learning purposes)
• Related to the this tutorial: COD Tutorial: How to evaluate COD-AB topology