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Alaska and Yukon's 583,200 km² Fortymile region is covered by modeled lichen ground cover estimates at 30 m resolution for 2000 and 2015, derived using a random forest model with inputs from in-situ plots, aerial surveys, and UAS imagery. The dataset also includes high-resolution (<1 m to 2 m) site-level presence-absence and cover maps from 22 forested and alpine sites surveyed in summer 2017. These maps, produced by ORNL_CLOUD, support analysis of winter forage for nine resident caribou herds.
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