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2017. GLIMS. This polygon shapefile contains glacier outlines for the Iceland region. These data also include an ancillary CSV file containing all hypsometric d... GLIMS.
2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This point shapefile shows the locations of impact structures in the United States. An impact structure is a crater formed by the impact of a meteo... Geological Survey (U.S.) and National Atlas of the United States.
1833. Rumsey, David, 1944-, Churchman, Joseph and James, and Moore, I.W. This layer is a georeferenced image of a map of the United States, originally created by James and Joseph Churchman and I.W. Moore in 1833. The sta... Cartography Associates.
1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, and 1991. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for Iceland compiled from sources dating from 1967 to 1991. Heat flow is a measure of heat loss across... International Heat Flow Commission.
1786. Rumsey, David, 1944- and Pownall, Thomas. This layer is a georeferenced image of a map of North America orignally created by T. Pownall in 1786. The original map appears in "A general atlas... Cartography Associates.
2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polyline shapefile depicts single-line drainages for rivers in North America only ranked by relative importance. Includes name and line width ... North American Cartographic Information Society.
1820. Center for Spatial and Textual Analysis. This layer is a georeferenced image of a map of the United States. The original map was published in 'A Complete Genealogical, Historical, Chronolo... Stanford Digital Repository.
2009. World Wildlife Fund (WWF). This raster layer is a void-filled digital elevation model (DEM) of North America at 15 arc-seconds resolution. Elevation is expressed in meters an... U.S. Geological Survey.
1733. Rumsey, David, 1944- and Popple, Henry. This layer is a georeferenced image of a map of North America originally created by H. Popple in 1733. The original map appears in "A Map of the Br... Cartography Associates.
2014. National Energy Information Center (U.S.). This point shapefile identifies ethylene crackers in the United States as of October 2014. Ethylene crackers are petrochemical complexes that proce... National Energy Information Center (U.S.).