Red alder trees distribution in the United States Pacific Northwest for 2002 summarized for NHDPlus v2 catchments

This spatial data set was created by the U.S. Geological Survey (USGS) to represent the basal area of red alder trees within each incremental watershed delineated in...本空间数据集由美国地质调查局（U.S. Geological Survey, USGS）编制，旨在表征逐次划定的各流域内的红桤木断面积（basal area）。