Some software systems and tools use subregions as their unit of observation. The definition of a subregion is most often based on geography or political boundaries (e.g., the Willamette Valley subregion of the Northwest US region), but definitions based on socioeconomic criteria are not uncommon (e.g., rust belt subregion of Midwest US region or the Bible belt subregion of the Southeast US). Similar to the concept of region, the concept of subregion is highly relative and therefore not closely tied to scale or spatial extent.
Spatial Analysis Unit
Graphical Ontology Browser
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