Definition
Given a set of n points and a query point, q , the nearest-neighbor (NN) problem is concerned with finding the point closest to the query point. Figure 1 shows an example of the nearest neighbor problem. On the left side is a set of n = 10 points in a two-dimensional space with a query point, q . The right shows the problem solution, s.
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O’Neil, D.J. (2017). Nearest Neighbor Problem. In: Shekhar, S., Xiong, H., Zhou, X. (eds) Encyclopedia of GIS. Springer, Cham. https://doi.org/10.1007/978-3-319-17885-1_869
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