2013. United States. Department of State. Office of the Geographer. This polygon shapefile contains the boundaries of countries in North America. This layer, created by the Office of the Geographer, combines two dat... United States. Department of State. Office of the Geographer. Humanitarian Information Unit.
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2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This polygon shapefile shows areas of permanent ice found on the North America landmass including Greenland, and also shows areas of land found wit... Geological Survey (U.S.).
1947. 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 North America compiled from sources dating from 1947 to 2010. Heat flow is a measure of heat loss ... International Heat Flow Commission.
2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This line shapefile shows the coastline, linear hydrographic features, and area hydrographic features in North America. This data set was produced ... Geological Survey (U.S.).
2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This polygon shapefile shows areas of coastline, and other hydrographic features in North America. This data set was produced using digital files s... Geological Survey (U.S.).
2011. United States. Bureau of Transportation Statistics, Beningo, Steve, United States. Bureau of Customs and Border Protection, and Liu, Zhi. This point shapefile depicts points of entry for land modes along the United States - Canada border and the United States - Mexico border. The port... United States. Bureau of Transportation Statistics.
2012. United States. Department of State. Office of the Geographer. This line shapefile contains country boundaries for Africa and American continents. Large Scale International Boundaries (LSIB) are created and mai... United States. Department of State. Humanitarian Information Unit.
2010. National Geophysical Data Center. This map layer shows isogonic lines (lines of constant declination of the Earth's magnetic field), derived from the International Geomagnetic Refer... National Atlas of the United States.
2010. National Geophysical Data Center. This line shapefile shows lines of equal horizontal intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference F... National Atlas of the United States.
2010. National Geophysical Data Center. This shapefile shows isoclinic lines (lines of constant inclination of the Earth's magnetic field), derived from the International Geomagnetic Refe... National Atlas of the United States.
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