We delineated four model sub-regions to better capture finer scale regional patterns in large high-severity fire risk by grouping ecoregional subsections or portions of subsections into 4 larger sub-regions based on ecological and climatic similarities, while also maintaining adequate fire data sample sizes within each. Source of ecoregional subsections: Ecological Subregions: Sections and Subsections for the Conterminous United States, USDA - Forest Service ECOMAP Team, 2007.
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