2001. Geological Survey (U.S.). This raster layer is a georeferenced image containing impervious surface data for the conterminous United States. Data are in an Albers Equal-Area ... Geological Survey (U.S.).
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2014. National Atlas of the United States. This polygon shapefile consists of National Wilderness Preservation System areas of 320 acres or more, in the United States, Puerto Rico, and the U... National Atlas of the United States.
1978. Pinsky, Malin L., Springmeyer, Dane B., Goslin, Matthew N., and Augerot, Xanthippe. This dataset is a visualization of abundance estimates for six species of Pacific salmon (Oncorhynchus spp.): Chinook, Chum, Pink, Steelhead, Socke... Stanford Digital Repository.
2011. United States. Bureau of Transportation Statistics. This polygon shapefile depicts service wide boundary set for display and general analysis purposes. This layer is part of the 2014 National Transpo... United States. Bureau of Transportation Statistics.
2007. National Center for Ecological Analysis and Synthesis. This raster dataset is a global model of artisanal fishing based on small scale fisheries data and population proximity to coastal areas. See the L... Science.
2004. United States. Forest Service. This polygon shapefile is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.... National Atlas of the United States.
2000. University of Minnesota. Institute on the Environment. This raster dataset depicts equal area climate bins for barley crops. Climate bins are defined by precipitation and growing degree days in crop are... University of Minnesota. Institute on the Environment.
2000. University of Minnesota. Institute on the Environment. This raster dataset represents a climate-defined potential yield (in tons per hectare) of barley crops for the year 2000 compared to other farmers ... University of Minnesota. Institute on the Environment.
2000. University of Minnesota. Institute on the Environment. This raster dataset represents the average gap (in tons per hectare) between observed yields in the year 2000 and a climate-defined potential yield... University of Minnesota. Institute on the Environment.
1999. Patuxent Wildlife Research Center. This line shapefile portrays the current routes used for conducting Breeding Bird Surveys in the lower 48 States. This layer is part of the 1997-20... National Atlas of the United States.