2015. Hijmans, Robert J. and University of California, Berkeley. Museum of Vertebrate Zoology. This polygon shapefile contains the second-level administrative divisions of United States (adm2). Level 2 divisions include counties and cities. T... University of California, Berkeley. Museum of Vertebrate Zoology.
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2012. Rukstales, Kenneth S. (compiler). This polygon shapefile represents seismic hazards in the United States. The data represent a model showing the probability that ground motion will ... National Atlas of the United States.
2005. Geological Survey (U.S.). This point shapefile contains the locations and attributes of significant, historic earthquakes that caused deaths, property damage, and geological... National Atlas of the United States.
1983. NASA Langley Atmospheric Sciences Data Center. This polygon shapefile represents the average monthly and annual measurements (kWh/m^2/day) of solar direct normal radiation (DNI) for the entire g...
1983. NASA Langley Atmospheric Sciences Data Center. This polygon shapefile represents the 22 year average monthly and annual measurements (kWh/m^2/day) of global horizontal irradiance (GHI) for the e... NASA Langley Atmospheric Sciences Data Center.
1983. NASA Langley Atmospheric Sciences Data Center. This polygon shapefile contains monthly and annual averages of solar Latitude Tilt Irradiance data (kWh/m^2/day) compiled by NASA and SSE. These da... NASA Langley Atmospheric Sciences Data Center.
2006. United States. Agricultural Research Service. This polygon shapefile portrays the spread, by year, of the Africanized honey bee (AHB) in the United States, Puerto Rico, and the U.S. Virgin Isla... National Atlas of the United States.
2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts internal, first-order administrative boundaries and polygons for all but a few tiny countries. Includes name attribu... North American Cartographic Information Society.
2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shape file depicts internal, first-order administrative boundaries for states and provinces of Australia, Brazil, Canada and the Unite... North American Cartographic Information Society.
2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts internal, first-order administrative boundaries and polygons for all but a few tiny countries. Includes name attribu... North American Cartographic Information Society.