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Figure 1 – uploaded by Leo Mulhare

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Two polygons are point-adjacent if they are not line-adjacent but they meet at 1 or more points. Examples of the two types of adjacency can be seen in figure 1. Figure 1. The polygons on the left are line-adjacent, while the shaded polygons on the right are point-adjacent.

Figure 1 Two polygons are point-adjacent if they are not line-adjacent but they meet at 1 or more points. Examples of the two types of adjacency can be seen in figure 1. Figure 1. The polygons on the left are line-adjacent, while the shaded polygons on the right are point-adjacent.

Related Figures (2)

Figure 2. A structurally- matching template context and unclassified polygon context An example of a template context and an unclassified polygon context can be seen in figure 2. A full structural match can be established between the context of the template polygon (1) and the unclassified polygon (6), using the mappings (2310, 348, 449, 57). This allows the feature code suggested by the template, “building”, to be mapped to the target polygon. In this case there is only one structural mapping between the tw contexts, but in general there may be many; any of which are sufficient to establish an isomorphism. CONCLUSION
Figure 2. A structurally- matching template context and unclassified polygon context An example of a template context and an unclassified polygon context can be seen in figure 2. A full structural match can be established between the context of the template polygon (1) and the unclassified polygon (6), using the mappings (2310, 348, 449, 57). This allows the feature code suggested by the template, “building”, to be mapped to the target polygon. In this case there is only one structural mapping between the tw contexts, but in general there may be many; any of which are sufficient to establish an isomorphism. CONCLUSION
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