In this paper we describe the application of analogical structure matching techniques to the domain of Geographic Information Systems (GIS). Automatic categorisation of map data into roads, buildings etc. is currently based on isolated objects. We describe how identifying analogous clusters of objects can categorise ambiguous polygons by introducing context into the categorisation process. We describe a number of GIS classification tasks that can be performed by analogical structure matching, resulting in a useful classification tool that operates in a cognitively plausible manner.