10,000+ results returned
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Title: World (Earthquakes, 2003)
Contributors:- Point data
- 2003
Summary: This data base provides information on earthquakes from2100 B.C. to the present. The data base containsearthquakes with known magnitude values between 0.1 and9.9. Earthquakes that have no computed magnitude values arealso included in the data base. Users of micro-earthquakedata (magnitude less than or equal to 0.0) should contactinstitutions that operate seismograph networks in theirarea of interest. In reality, there are very few eventswith magnitude less than 2.0 in the data base.
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Title: Global GIS : Earthquake epicenters (1973-2003)
Contributors:- Point data
- 2003
- American Geological Institute
- Geological Survey (U.S.)
- Environmental Systems Research Institute (Redlands, Calif.)
- National Earthquake Information Center
- National Geophysical Data Center
Summary: This datalayer is a point coverage representing earthquake epicenters (1973 through March, 2003). Historical data for this layer were derived from: USGS/NEIC, 1973- March 2003: (PDE) Preliminary Determinations of Epicenters, Monthly Listing. This list is the most complete computation of hypocenters and magnitudes done by the USGS NEIC. It is normally produced a few months after the events occur. The publication is called 'Preliminary' because the 'final' computation of hypocenters for the world is considered to be the Bulletin of the Internation Seismological Centre (ISC), which is produced about two years after the earthquakes occur. The NEIC PDE program contributes about one-third off all data used by the ISC.
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Title: Global GIS : Significant earthquakes (2150 B.C. until 1994 A.D.)
Contributors:- Point data
- 1994
Summary: This shapefile includes points which represent locations of significant historical earthquakes worldwide documented from 2150 B.C. until 1994 A.D. Data included here was derived from the 'Catalog of Significant Earthquakes 2150 B.C. to the present : including quantitative casualties and damage,' by Paula K. Dunbar, Patricia A. Lockridge, and Lowell S. Whitewide (a National Geophysical Data Center (NGDC) publication). Post-1991 data is supplemented by the USGS/National Earthquake Information Center (NEIC). This catalog is available as an online database, with significant earthquake data kept up-to-date, on the NGDC Web site. The events were gathered from scientific and scholarly sources, regional and worldwide catalogs, and individual event reports. The list includes all events that meet at least one of the following criteria: Moderate damage (approximately $1 million or more); Ten or more deaths; Magnitude 7.5 or greater; Intensity X or greater (for events lacking magnitude)
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Title: Cosmogenic Exposure Ages, Alaska Palaeo-Glacier Atlas
Contributors:- Point data
- 2011
Summary: This line shapefile contains cosmogenic exposure ages from late and early Wisconsinan drift linked to references in the geospatial database. Most 10Be and 26Al ages use the same or very similar production rate. All 36Cl ages use the same production rates. Refer to original reference for all details of age and scaling calculations, in addition to how authors handle erosion rate and snow shielding.This report is an update of the Alaska PalaeoGlacier Atlas. It includes information published since 2002 and is based on a more detailed map scale. In addition to the all-time maximum extent of former glaciers and the late Wisconsinan extent, this update includes the mapped limit for the penultimate glaciation, which generally occurred during the early Wisconsinan. The update also includes a compilation of cosmogenic exposure ages linked to the geospatial database. The Alaska PalaeoGlacier Atlas is a geospatial summary of Pleistocene glaciation across Alaska. Our goal is a comprehensive and consistent overview of former glacier limits across Alaska. Our hope is to facilitate outreach, education, and interdisciplinary research in the fields of geology, geography, biology, and natural history. Coastal boundary aligned with imagery, no gaps in polygon, no topological errors, aggregate and % figures verified Kaufman, D. S., Young, N. E., Briner, J. P., & Manley, W. F. (2011). Cosmogenic Exposure Ages, Alaska Palaeo-Glacier Atlas (Version 2). Available at: http://purl.stanford.edu/xp715nb1520 * References: 1 = Young et al. (2009) 2 = Briner et al. (2005) 3 = Dortch et al. (2010) 4 = Matmon et al. (2006) 5 = Matmon et al. (in press) 6 = Dortch et al. (in press) 7 = Briner et al. (2001) 8 = Briner et al. (2002) This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Late Wisconsinan Glacier Limits, Alaska Palaeo-Glacier Atlas
Contributors:- Line data
- 2011
Summary: This line shapefile represents the Late Wisconsinan glacier linits (extent). Pleistocene glaciers once covered >1,200,000 km2, from the continental shelf bordering the North Pacific to the northern foothills of the Brooks Range. Late Wisconsin glaciers occupied 727,800 km2 -- nearly ten times the area of modern glaciers, but only 48% of the state. Alaska's glaciers expanded more than 20 times during the last 3 million years in response to cold and snowy conditions. During the late Wisconsin glaciation, when sea level fell approximately 125 m (approx. 400 ft), the Bering Land Bridge was exposed as a broad tundra plain, and much of the state escaped glaciation due to a cold but dry climate. Deposition and erosion by glaciers in the recent geologic past have greatly influenced Alaska's landscapes and ecosystems. This report is an update of the Alaska PalaeoGlacier Atlas. It includes information published since 2002 and is based on a more detailed map scale. In addition to the all-time maximum extent of former glaciers and the late Wisconsinan extent, this update includes the mapped limit for the penultimate glaciation, which generally occurred during the early Wisconsinan. The update also includes a compilation of cosmogenic exposure ages linked to the geospatial database. The Alaska PalaeoGlacier Atlas is a geospatial summary of Pleistocene glaciation across Alaska. Our goal is a comprehensive and consistent overview of former glacier limits across Alaska. Our hope is to facilitate outreach, education, and interdisciplinary research in the fields of geology, geography, biology, and natural history. Coastal boundary aligned with imagery, no gaps in polygon, no topological errors, aggregate and % figures verified Kaufman, D. S., Young, N. E., Briner, J. P., & Manley, W. F. (2011). Late Wisconsinan Glacier Limits, Alaska Palaeo-Glacier Atlas (Version 2). Available at: http://purl.stanford.edu/qx082pz5652 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Early Wisconsinan Glacier Limits, Alaska Palaeo-Glacier Atlas
Contributors:- Line data
- 2011
Summary: This line shapefile represents Early Wisconsinan glacier limits. This report is an update of the Alaska PalaeoGlacier Atlas. It includes information published since 2002 and is based on a more detailed map scale. In addition to the all-time maximum extent of former glaciers and the late Wisconsinan extent, this update includes the mapped limit for the penultimate glaciation, which generally occurred during the early Wisconsinan. The update also includes a compilation of cosmogenic exposure ages linked to the geospatial database. The Alaska PalaeoGlacier Atlas is a geospatial summary of Pleistocene glaciation across Alaska. Our goal is a comprehensive and consistent overview of former glacier limits across Alaska. Our hope is to facilitate outreach, education, and interdisciplinary research in the fields of geology, geography, biology, and natural history. Coastal boundary aligned with imagery, no gaps in polygon, no topological errors, aggregate and % figures verified Kaufman, D. S., Young, N. E., Briner, J. P., & Manley, W. F. (2011). Early Wisconsinan Glacier Limits, Alaska Palaeo-Glacier Atlas (Version 2). Available at: http://purl.stanford.edu/tg987qh8191 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Maximum Pleistocene Glacier Limits, Alaska Palaeo-Glacier Atlas
Contributors:- Line data
- 2011
Summary: This line shapefile represents the maximum pleistocene glacier limits (extent). This report is an update of the Alaska PalaeoGlacier Atlas. It includes information published since 2002 and is based on a more detailed map scale. In addition to the all-time maximum extent of former glaciers and the late Wisconsinan extent, this update includes the mapped limit for the penultimate glaciation, which generally occurred during the early Wisconsinan. The update also includes a compilation of cosmogenic exposure ages linked to the geospatial database. The Alaska PalaeoGlacier Atlas is a geospatial summary of Pleistocene glaciation across Alaska. Our goal is a comprehensive and consistent overview of former glacier limits across Alaska. Our hope is to facilitate outreach, education, and interdisciplinary research in the fields of geology, geography, biology, and natural history. Coastal boundary aligned with imagery, no gaps in polygon, no topological errors, aggregate and % figures verified Kaufman, D. S., Young, N. E., Briner, J. P., & Manley, W. F. (2011). Maximum Pleistocene Glacier Limits, Alaska Palaeo-Glacier Atlas (Version 2). Available at: http://purl.stanford.edu/kh036xb5342 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Late Wisconsin Glaciers, Alaska Palaeo-Glacier Atlas
Contributors:- Polygon data
- 2011
Summary: This line shapefile represents the extent of glaciers during the late Wisconsin glaciation (also known as the Last Glacial Maximum, about 20,000 years ago). Pleistocene glaciers once covered >1,200,000 km2, from the continental shelf bordering the North Pacific to the northern foothills of the Brooks Range. Late Wisconsin glaciers occupied 727,800 km2 -- nearly ten times the area of modern glaciers, but only 48% of the state. Alaska's glaciers expanded more than 20 times during the last 3 million years in response to cold and snowy conditions. During the late Wisconsin glaciation, when sea level fell approximately 125 m (approx. 400 ft), the Bering Land Bridge was exposed as a broad tundra plain, and much of the state escaped glaciation due to a cold but dry climate. Deposition and erosion by glaciers in the recent geologic past have greatly influenced Alaska's landscapes and ecosystems. This report is an update of the Alaska PalaeoGlacier Atlas. It includes information published since 2002 and is based on a more detailed map scale. In addition to the all-time maximum extent of former glaciers and the late Wisconsinan extent, this update includes the mapped limit for the penultimate glaciation, which generally occurred during the early Wisconsinan. The update also includes a compilation of cosmogenic exposure ages linked to the geospatial database. The Alaska PalaeoGlacier Atlas is a geospatial summary of Pleistocene glaciation across Alaska. Our goal is a comprehensive and consistent overview of former glacier limits across Alaska. Our hope is to facilitate outreach, education, and interdisciplinary research in the fields of geology, geography, biology, and natural history. Coastal boundary aligned with imagery, no gaps in polygon, no topological errors, aggregate and % figures verified Kaufman, D. S., Young, N. E., Briner, J. P., & Manley, W. F. (2011). Late Wisconsin Glaciers, Alaska Palaeo-Glacier Atlas (Version 2). Available at: http://purl.stanford.edu/vv347vv3451 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Mexico (Municipalities, 1990)
Contributors:- Polygon data ; Point data
- 1999
Summary: Population growth is widely recognized as a key driving force behind environmental change, especially in developing countries. Improving understanding of the processes involved in population growth and the environmental and socioeconomic factors associated with it is therefore critical. Unfortunately, one barrier to better understanding has been the lack of detailed subnational data on population distribution and change and the difficulty of linking such data to environmental and other datasets that do not conform with administrative units.In recognition of this problem, the Center for International Earth Science Information Network (CIESIN) developed a population data collection for Mexico, drawing on a unique set of georeferenced population data and on Geographic Information System (GIS) technology. Mexico is of particular interest because of its rapid population growth and urbanization, diverse levels of development, growing environmental problems, and potential vulnerability to global environmental change.The Georeferenced Population Data Sets of Mexico consists of the following products: Population Database of Mexico; Urban Place, Time-Series Population Spreadsheet of Mexico; Urban Place GIS Coverage of Mexico; GIS Coverage of Mexican Localities; GIS Coverage of Mexican States; GIS Coverage of Mexican Municipalities; and Raster Based GIS Coverage of Mexican Population. Included in the collection are approximately 100,000 records of geographic and census items for Mexican states, municipalities, and localities. The geographic records consist of state boundaries, place names, geographic coordinates of more than 30,000 urban and metropolitan places, and elevation data for more than 700 urban places. The census records contain estimates of 1990 population density, population by gender, and population by age bracket (below 6 years of age, between 6 and 14 years, and older than 15 years). For 706 selected urban localities, the population is traced back by decades, from 1990 to 1921, based on census documents.
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Title: Magnetic Field - Secular Variation of the Total Field Component for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This line shapefile shows lines of equal annual change (secular variation), in the total field intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic intensity is the strength of the magnetic field, and is described in terms of a horizontal component and a vertical component. The total field intensity is the strength of the field, not divided into its component parts. The change in intensity is measured in nanoTeslas per year. This layer is part of the 1997-2014 edition of the National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Secular Variation of the Total Field Component for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/wc571cd7743. National Atlas of the United States. (2011). Magnetic Field - Secular Variation of the Total Field Component for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/wc571cd7743. The total field intensity (F) and the secular variation (FSV, the time rate of change of F) of the IGRF change smoothly over most of the Earth. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml>. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Magnetic Field - Secular Variation of the Vertical Component of the Total Field Intensity for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This line shapefile shows lines of equal annual change (secular variation) in the vertical component of the total field intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic intensity is the strength of the magnetic field, and is described in terms of a horizontal component and a vertical component. The change in intensity is measured in nanoTeslas per year. This layer is part of the 1997-2014 edition National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Secular Variation of the Vertical Component of the Total Field Intensity for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/tf850kx9173. The vertical component (Z) and the secular variation (ZSV, the time rate of change of Z) of the IGRF change smoothly over most of the Earth. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml>. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Magnetic Field - Inclination Component for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This shapefile shows isoclinic lines (lines of constant inclination of the Earth's magnetic field), derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic inclination is the angle between the magnetic field vector and the horizontal plane. This layer is part of the 1997-2014 edition of the National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Inclination Component for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/yy515bz4983. National Atlas of the United States. (2011). Magnetic Field - Inclination Component for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/yy515bz4983. The inclination component (I) of the IGRF changes smoothly over most of the Earth. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml>. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Magnetic Field - Secular Variation of the Inclination Component for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This shapefile shows lines of equal annual change (secular variation) in the inclination of the Earth's magnetic field, derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic inclination is the angle between the magnetic field vector and the horizontal plane. The change is measured in arc minutes per year. This layer is part of the 1997-2014 edition National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Secular Variation of the Inclination Component for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/ct661sy1974. National Atlas of the United States. (2011). Magnetic Field - Secular Variation of the Inclination Component for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/ct661sy1974. The inclination component (I) and the secular variation (ISV, the time rate of change of I) of the IGRF change smoothly over most of the Earth. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml>. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Magnetic Field - Secular Variation of the Declination Component for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This map layer shows isoporic lines (lines of equal annual change, or secular variation, in the declination of the Earth's magnetic field), derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic declination is the angle between true north and magnetic north (the direction of the magnetic field vector) in the horizontal plane. The change is measured in arc minutes per year. This layer is part of the 1997-2014 edition National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the National Atlas of the United States or the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Secular Variation of the Declination Component for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/hc347kh4279. The declination component (D) and the secular variation (DSV, the time rate of change of D) of the IGRF change smoothly over most of the Earth with the exception of a region surrounding each of the geomagnetic poles. Near the geomagnetic poles, the isogonic lines (lines of constant declination) and isoporic lines crowd closer and closer together because at adjacent grid points (1 degree separation) the IGRF values of D and DSV upon which the lines are based vary extremely. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml>. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Magnetic Field - Declination Component for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This map layer shows isogonic lines (lines of constant declination of the Earth's magnetic field), derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic declination is the angle between true north and magnetic north (the direction of the magnetic field vector) in the horizontal plane. This layer is part of the 1997-2014 edition National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the National Atlas of the United States or the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Declination Component for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/vf147hh5908. The declination component (D) of the IGRF changes smoothly over most of the Earth with the exception of a region surrounding each of the geomagnetic poles. Near the geomagnetic poles, the isogonic lines (lines of equal declination) crowd closer and closer together. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml> This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Magnetic Field - Secular Variation of the Horizontal Component of the Total Field Intensity for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This line shapefile shows lines of equal annual change (secular variation) in the horizontal component of the total field intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic intensity is the strength of the magnetic field, and is described in terms of a horizontal component and a vertical component. The change in intensity is measured in nanoTeslas per year. This layer is part of the 1997-2014 edition National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the National Atlas of the United States or the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Secular Variation of the Horizontal Component of the Total Field Intensity for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/ws730zd1226. National Atlas of the United States. (2011). Magnetic Field - Secular Variation of the Horizontal Component of the Total Field Intensity for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/ws730zd1226. The horizontal component (H) and the secular variation (HSV, the time rate of change of H) of the IGRF change smoothly over most of the Earth. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml> This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Magnetic Field - Horizontal Component of the Total Field Intensity for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This line shapefile shows lines of equal horizontal intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic intensity is the strength of the magnetic field, and is described in terms of a horizontal component and a vertical component. Horizontal intensity is the horizontal strength of the magnetic field. This layer is part of the 1997-2014 edition of the National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Horizontal Component of the Total Field Intensity for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/nm647kh2178. National Atlas of the United States. (2011). Magnetic Field - Horizontal Component of the Total Field Intensity for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/nm647kh2178. The horizontal component (H) of the IGRF changes smoothly over most of the Earth. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml>. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Magnetic Field - Total Field Intensity for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This shapefile contains isodynamic lines (lines of equal total intensity of the Earth's magnetic field), derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic intensity is the strength of the magnetic field, and is described in terms of a horizontal component and a vertical component. The total field intensity is the strength of the field, not divided into its component parts. This layer is part of the 1997-2014 edition National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Total Field Intensity for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/bf120gs4142. National Atlas of the United States. (2011). Magnetic Field - Total Field Intensity for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/bf120gs4142. The total field intensity (F) of the IGRF changes smoothly over most of the Earth. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml>. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Magnetic Field - Vertical Component of the Total Field Intensity for the Epoch 2010.0
Contributors:- Line data
- 2011
Summary: This line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Field (IGRF) for the epoch 2010.0. Magnetic intensity is the strength of the magnetic field, and is described in terms of a horizontal component and a vertical component. Vertical intensity is the vertical strength of the magnetic field. This layer is part of the 1997-2014 edition National Atlas of the United States. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data. National Atlas of the United States. (2011). Magnetic Field - Vertical Component of the Total Field Intensity for the Epoch 2010.0. National Atlas of the United States. Available at: http://purl.stanford.edu/pn554xc7879. The vertical component (Z) of the IGRF changes smoothly over most of the Earth. For more information about the geomagnetic field, please visit <http://www.ngdc.noaa.gov/geomag/faqgeom.shtml>. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
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Title: Coal Mines, Surface and Underground, United States, 2012
Contributors:- Point data
- 2015
Summary: This point shapefile represents operating surface and underground coal mines in the United States as of 2012 These data originate from the U.S. Energy Information Administration, Form EIA-7A "Coal Production and Preparation Report" and the U.S. Department of Labor, Mine Safety and Health Administration Form 7000-2, "Quarterly Mine Employment and Coal Production Report." This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2015). Coal Mines, Surface and Underground, United States, 2012. National Energy Information Center. Available at: http://purl.stanford.edu/mn565xr9255. For additional mine data see "Historical Detailed Coal Production Data": http://www.eia.gov/coal/data.cfm#production The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.