EXPLORATORY GEOSPATIAL DATA ANALYSIS USING SELF-ORGANIZING MAPS Case Study of Portuguese Mainland Regions
نویسندگان
چکیده
This paper describes the application of the Self-Organizing Map (SOM) in visual exploration of physical geography data. The main justifications for the application of SOM in this issue is that its stresses local factors and topological order. Public domain thematic maps from Portuguese Environment Institute are used. An adequate geospatial unfolding of SOM is presumed to assist a better representation of geographic phenomena. Some approaches to achive this objective are put forward and experimented such as weighting attributes and samples, and a SOM variant named Geo-SOM. Visualization methods to address the information extraction issue are also suggested. Notwithstanding the vagueness of geographic phenomena, experimental results reveal major patterns that are consistent with reference maps of Portuguese mainland regions.
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