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Editing affects topology when it changes the relationship among the geographic features. An arc that used to meet another arc could be clipped so that they no longer meet, a new arc could be added to split a polygon in two, and an arc could be deleted to merge two polygons into one. We will investigate the effect of editing on topology in this chapter.
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Highlight arcs around a node. This is to show that the GIS has linked arcs around a node for quick retrieval.
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