2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This polygon shapefile depicts the political boundaries of North America, including: international boundaries, provincial boundaries, state or terr... Geological Survey (U.S.).
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2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the horizontal component of the total field intensity of the Earth's ... National Atlas of the United States.
2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the vertical component of the total field intensity of the Earth's ma... National Atlas of the United States.
2010. National Geophysical Data Center. This shapefile shows lines of equal annual change (secular variation) in the inclination of the Earth's magnetic field, derived from the Internatio... National Atlas of the United States.
2010. National Geophysical Data Center. This line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Fie... National Atlas of the United States.
2010. National Geophysical Data Center. This shapefile contains isodynamic lines (lines of equal total intensity of the Earth's magnetic field), derived from the International Geomagnetic... National Atlas of the United States.
1992 and 1993. Geological Survey (U.S.). This raster layer is a georeferenced grid map image of land cover characteristics for North America, excluding Hawaii, and including the Caribbean ... Geological Survey (U.S.).
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 annual change (secular variation), in the total field intensity of the Earth's magnetic field, derived fro... National Atlas of the United States.
1910. International Bathymetric Chart of the Arctic Ocean, 30 Arc-Second Resolution GeoTIFF (Version 3.0)
1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, and 2011. IOC (Intergovernmental Oceanographic Commission), Jakobsson, M, Mayer, Larry A. (Larry Allan), 1952-, Coakley, Bernard, Dowdeswel, Julian A., Forbes, Steve, Fridman, Boris, 1956-, Hodnesdal, Hanne, Noormets, Riko, Pedersen, Richard J., 1952-, Rebesco, M. (Michele), Schenke, Hans Werner, Zarayskaya, Yulia, Daniela Accettella, Armstrong, Andrew, Anderson, Robert M., Bienhoff, Paul, Camerlenghi, A. (Angelo), Church, Ian, Edwards, Margo, Gardner, James V., Hall, John Kendrick, 1940-, Hell, Benjamin, Hestvik, Ole, Kristoffersen, Y., Marcussen, Christian, Mohammad, Rezwan, Mosher, David Cole, 1960-, Nghiem, Son V., Pedrosa, Maria Teresa, Travaglini, Paola G., and Weatherall, Pauline. This layer is a georeferenced raster image (GeoTIFF) of a digital bathymetric model (DBM) of the Arctic Ocean compiled with all multibeam, dense si... National Geophysical Data Center.