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By T. Sutton, O. Dassau, M. Sutton

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Roads) can each have their own symbol. Within the GIS Application we can open /choose to use Unique Value symbology for a layer. The GIS will scan through all the different string values in the attribute field and build a list of unique strings or numbers. Each unique value can then be assigned a colour and style. This is shown in Illustration 41 below. Illustration 41: Defining unique value symbology for roads based on the road type. 33 When the GIS draws the layer, it will look at the attributes of each feature before drawing it to the screen.

Imagine you travel to London. On a sightseeing tour you plan to visit St. Paul's Cathedral first and in the afternoon Covent Garden Market for some souvenirs. Looking at the Underground map of London (see Illustration 58 below) you have to find connecting trains to get from Covent Garden to St. Paul's. This requires topological information (data) about where it is possible to change trains. Looking at a map of the underground, the topological relationships are illustrated by circles that show connectivity.

Changing trains at stations allows you to move from one connected part of the network to another. Illustration 58: Topology of London Underground Network. 59 Topology errors There are different types of topological errors and they can be grouped according to whether the vector feature types are polygons or polylines. Topological errors with polygon features can include unclosed polygons, gaps between polygon borders or overlapping polygon borders. A common topological error with polyline features is that they do not meet perfectly at a point (node).

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