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Legend for National Land Cover Database (NLCD) showing the 20 classes and the numeric coding for each. As noted in the graphic, four classes are only available in Alaska. Perennial ice did not appear in our data, so we have 15 classes. For this study, the categories were organized into five final classes: Water, Developed, and Agriculture (WDA), Shrubs (SHBs), Grasses (GRSs), Mixed Forest (MFO), and Evergreen Forest (EFO).
