Abstract
Spatial clustering is a method that can reveal structures and identify groupings in large spatial data sets, which is in particular useful for spatial planning and analysis tasks. A recent and powerful clustering algorithm for spatial data is contextual neural gas (CNG). The CNG algorithm is closely related to the basic self-organizing map algorithm but additionally takes spatial dependence into account. However, like most clustering algorithms, CNG requires the analyst to specify the number of clusters beforehand. Even though the chosen number of clusters critically affects the results of the clustering, it is unclear how to determine it. This study introduces a new method which combines CNG, the learning of the CNG’s topology, and graph clustering. It can be used to cluster spatial data without any prior knowledge of present clusters in the data. The proposed method is in particular useful for spatial planning and analysis tasks, because it provides means to find groupings in the data and identify homogeneous regions. To evaluate the method, this study draws from two experiments which are based on a synthetic and a real-world data set. The results of the synthetic data set show that it can correctly identify clusters in a predefined setting. The results of the real-world data set demonstrate that the proposed method outlines meaningful and theoretically sound regions.
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Hagenauer, J. (2015). Clustering Contextual Neural Gas: A New Approach for Spatial Planning and Analysis Tasks. In: Helbich, M., Jokar Arsanjani, J., Leitner, M. (eds) Computational Approaches for Urban Environments. Geotechnologies and the Environment, vol 13. Springer, Cham. https://doi.org/10.1007/978-3-319-11469-9_4
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DOI: https://doi.org/10.1007/978-3-319-11469-9_4
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