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8,599 results returned

  1. Title: Cosmogenic Exposure Ages, Alaska Palaeo-Glacier Atlas

    Contributors:

    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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  2. Title: Late Wisconsinan Glacier Limits, Alaska Palaeo-Glacier Atlas

    Contributors:

    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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  3. Title: Early Wisconsinan Glacier Limits, Alaska Palaeo-Glacier Atlas

    Contributors:

    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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  4. Title: Maximum Pleistocene Glacier Limits, Alaska Palaeo-Glacier Atlas

    Contributors:

    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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  5. Title: Late Wisconsin Glaciers, Alaska Palaeo-Glacier Atlas

    Contributors:

    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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  6. Title: World (Earthquakes, 2003)

    • Point data
    • 2003
    Contributors:

    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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  7. Title: Global Dams

    Contributors:

    Summary: Global Dams is a point theme representing dams Worldwide. A variety of attribute information is provided, including names, type classifications, state-level information (1st level administrative division) and country data. This dataset is provided in both .txt files and a ESRI Geodatabase format.

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  8. Title: Mexico (Municipalities, 1990)

    • Polygon data ; Point data
    • 1999
    • MIT authentication required
    Contributors:

    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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  9. Title: esridemog98 - World Demographics - DBMS View

    Contributors:

    Summary: World Demographics is a table with 28 country attributes on population, vital statistics, and the economy. This single table includes attributes for 1998 (both scales) and 1992 world countries. To display World Demographics attributes on a map, join the World Demographics table to the World Countries 1998 or World Countries 1992 table using Fips_code or Abbrevname as the common field.

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  10. Title: esripolorg98 - World Political Organization Membership - DBMS View

    Contributors:

    Summary: World Demographics is a table with 28 country attributes on population, vital statistics, and the economy. This single table includes attributes for 1998 (both scales) and 1992 world countries. To display World Demographics attributes on a map, join the World Demographics table to the World Countries 1998 or World Countries 1992 table using Fips_code or Abbrevname as the common field.

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  11. Title: esripolorg92 - World Political Organization Membership - DBMS View

    Contributors:

    Summary: World Political Organization Membership is a table with 14 attributes on membership of countries in world political organizations such as the Untied Nations and the Food and Agriculture Organization (FAO). To display World Political Organization Membership attributes on a map, join this table to the World Countries 1998 or World Countries 1992 table using Fips_code or Abbrevname as the common field.

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  12. Title: USA (National Waterway Network (line), 2008)

    • Line data
    • 2008
    Contributors:

    Summary: The National Waterway Network is a comprehensive network database of the nation's navigable waterways. The data set covers the 48 contiguous states plus the District of Columbia, Hawaii, Alaska, Puerto Rico and water links between. The nominal scale of the dataset varies with the source material. The majority ofthe information is at 1:100,000 with larger scales used in harbor/bay/port areas and smaller scales used in open waters.

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  13. Title: USA (National Waterway Network (node), 2008)

    • Point data
    • 2008
    Contributors:

    Summary: The National Waterway Network is a comprehensive network database of the nation's navigable waterways. The data set covers the 48 contiguous states plus the District of Columbia, Hawaii, Alaska, Puerto Rico and water links between. The nominal scale of the dataset varies with the source material. The majority ofthe information is at 1:100,000 with larger scales used in harbor/bay/port areas and smaller scales used in open waters.

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  14. Title: Ports: United States and Territories, 2012

    Contributors:

    Summary: This point shapefile depicts physical information on commercial facilities at the principal United States coastal, Great Lakes and inland ports. The data consists of listings of port area waterfront facilities, including information on berthing, cranes, transit sheds, grain elevators, marine repair plants, fleeting areas, and docking and storage facilities. Collection of data is performed on a rotational basis to ensure on-site accuracy at each facility. This layer is part of the 2014 National Transportation Atlas Database. The National Transportation Atlas Databases 2014 (NTAD2014) is a set of nationwide geographic datasets of transportation facilities, transportation networks, associated infrastructure and other political and administrative entities. These datasets include spatial information for transportation modal networks and intermodal terminals, as well as the re¬lated attribute information for these features. This data supports research, analysis, and decision-making across all transportation modes. It is most useful at the national level, but has major applications at regional, state and local scales throughout the transportation community. The data used to compile NTAD2014 was provided by our partners within the United States Department of Transportation (USDOT) and by other agencies throughout the United States Federal Government. These contributors are the actual data stewards and are ultimately responsible for the maintenance and accuracy of their data. The Navigation Data Center (NDC) had several objectives in developing the United States Waterway Data. These objectives support the concept of a National Spatial Data Infrastructure to: provide public access to national waterway data; foster inter-agency and intra-agency cooperation through data sharing; provide a mechanism to integrate waterway data (U.S. Army Corps of Engineers Port/Facility and U.S. Coast Guard Accident Data, for example); provide a basis for intermodal analysis; assist standardization of waterway entity definitions (Ports/Facilities, Locks, etc.); provide public access to the National Waterway Network which can be used as a basemap to support graphical overlays and analysis with other spatial data such as waterway and modal network/facility databases; and provide reliable data to support future waterway and intermodal applications. United States. Department of Transportation. Research and Innovative Technology Administration. (2014). Ports: United States and Territories, 2012. National Transportation Atlas Database 2014. Available at: http://purl.stanford.edu/gz919pm1319.

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  15. Title: Waterway Locks: United States, 2013

    Contributors:

    Summary: This point shapefile contains the locations of waterways locks in the United States. The Navigation Data Center had several objectives in developing the United States Waterway Data. These objectives support the concept of a National Spatial Data Infrastructure to: provide public access to national waterway data; foster inter-agency and intra-agency cooperation through data sharing; provide a mechanism to integrate waterway data (U.S. Army Corps of Engineers Port/Facility and U.S. Coast Guard Accident Data, for example); provide a basis for intermodal analysis; assist standardization of waterway entity definitions (Ports/Facilities, Locks, etc.); provide public access to the National Waterway Network (which can be used as a basemap to support graphical overlays and analysis with other spatial data, such as waterway and modal network/facility databases); and provide reliable data to support future waterway and intermodal applications. The data included in these files are based upon the Annual Summary of Lock Statistics published by the U.S. Army Corps of Engineers/Corps of Engineers –Institute for Water Resources (CEIWR) Navigation Data Center. The data are collected at each Corps owned and/or operated Lock by Corps personnel and towing industry vessel operators. This data was collected from the U.S. Army Corps of Engineers and distributed on the National Transportation Atlas Database (NTAD) 2014. The National Transportation Atlas Databases 2014 (NTAD2014) is a set of nationwide geographic datasets of transportation facilities, transportation networks, associated infrastructure and other political and administrative entities. These datasets include spatial information for transportation modal networks and intermodal terminals, as well as the re¬lated attribute information for these features. This data supports research, analysis, and decision-making across all transportation modes. It is most useful at the national level, but has major applications at regional, state and local scales throughout the transportation community. The data used to compile NTAD2014 was provided by our partners within the United States Department of Transportation (USDOT) and by other agencies throughout the United States Federal Government. These contributors are the actual data stewards and are ultimately responsible for the maintenance and accuracy of their data. Monthly summary statistics are based on data from the Lock Performance Monitoring System (LPMS). The LPMS was developed to collect a 100% sample of data on the locks that are owned and/or operated by the United States Army Corps of Engineers. Each record contains data summarized monthly by lock chamber, including direction upbound and number and types of vessels and lockages (recreation, commercial, tows, other), cuts, hardware operations, delay and processing times, number of tows and all vessels delayed, total tons, commodity tonnages and number of barges. The data are by waterway and by calendar year. The waterway files contain 5 years of data for one waterway. The calendar year files contain 1 year of data for all waterways. United States. Department of Transportation. Research and Innovative Technology Administration. (2014). Waterway Locks: United States, 2013. National Transportation Atlas Database 2014. Available at: http://purl.stanford.edu/dm938nj2170.

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  16. Title: HYDRO 1K Elevation Derivative Database

    Contributors:

    Summary: The drainage basins distributed with the HYDRO1k data set suite are derived using the vector stream networks along with the flow direction data set. Each polygon in the basin data set has been tagged with a Pfafstetter code uniquely identifying each sub-basin. A detailed description of the coding scheme can be found in Verdin. Additional attributes defining the characteristics of each sub-basin have been developed.

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  17. Title: CalWater 2.2 Watersheds

    Contributors:

    Summary: California Watershed Map: Version 2.2. This layer is composed of polygons at depict the boundary of the various watershed areas in Napa County.

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  18. Title: Grayscale Alaska Shaded Relief, 200-Meter Resolution, Albers projection

    Contributors:

    Summary: The grayscale Alaska shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of Alaska at a resolution of 200 meters. The NED is a raster product assembled by the U.S. Geological Survey, designed to provide national elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections made in the NED assembly process minimize artifacts, permit edge matching, and fill sliver areas of missing data. The National Atlas also includes a Lambert Azimuthal Equal Area projection shaded relief file; this file is the same data in an Albers projection. This layer is part of the 1997-2014 edition of the National Atlas of the United States. The grayscale shaded relief images were developed to portray the terrain of the United States. They are intended for visual purposes only. The original National Elevation Dataset (NED) data must be used for conducting analysis and determining elevation values. National Atlas of the United States. (2006). Grayscale Alaska Shaded Relief, 200-Meter Resolution, Albers projection. National Atlas of the United States. Available at: http://purl.stanford.edu/np649pb5860. The associated world file is included as part of the GeoTIFF. The contents of the world file are: >200.0000 >0.000000 >0.000000 >-200.0000 >-3390900.0000 >2449900.0000 The following projection file can be used when using ESRI's ArcGIS to view the GeoTIFF (any line breaks should be removed): PROJCS["Albers_NAD_1983_Alaska",GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0, 298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree", 0.0174532925199433]],PROJECTION["Albers"],PARAMETER ["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER ["Central_Meridian",-154.0],PARAMETER["Standard_Parallel_1",55.0], PARAMETER["Standard_Parallel_2",65.0],PARAMETER ["Latitude_Of_Origin",50.0],UNIT["Meter",1.0]] 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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  19. Title: Grayscale Hawaii Shaded Relief - 200-Meter Resolution, Albers projection

    Contributors:

    Summary: The grayscale Hawaii shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of Hawaii at a resolution of 200 meters. The NED is a raster product assembled by the U.S. Geological Survey, designed to provide national elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections made in the NED assembly process minimize artifacts, permit edge matching, and fill sliver areas of missing data. The National Atlas also includes a Lambert Azimuthal Equal Area projection shaded relief file; this file is the same data in an Albers projection. This layer is part of the 1997-2014 edition National Atlas of the United States. The grayscale shaded relief images were developed to portray the terrain of the United States. They are intended for visual purposes only. The original National Elevation Dataset (NED) data must be used for conducting analysis and determining elevation values. National Atlas of the United States. (2005). Grayscale Hawaii Shaded Relief - 200-Meter Resolution, Albers projection. National Atlas of the United States. Available at: http://purl.stanford.edu/zz896gs8547. The associated world file is included as part of the GeoTIFF. The contents of the world file are: >200.0000 >0.000000 >0.000000 >-200.0000 >-402900.0000 >2164900.0000 The following projection file can be used when using ESRI's ArcGIS to view the GeoTIFF (any line breaks should be removed): PROJCS["Albers_NAD_1983_Hawaii",GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0, 298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree", 0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting", 0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",- 157.0],PARAMETER["Standard_Parallel_1",8.0],PARAMETER ["Standard_Parallel_2",18.0],PARAMETER["Latitude_Of_Origin", 3.0],UNIT["Meter",1.0]] 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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  20. Title: Grayscale Puerto Rico and the U.S. Virgin Islands Shaded Relief 200- Meter Resolution, Albers projection

    Contributors:

    Summary: The grayscale Puerto Rico and U.S. Virgin Islands shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of Puerto Rico and U.S. Virgin Islands at a resolution of 200 meters. The NED is a raster product assembled by the U.S. Geological Survey, designed to provide national elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections made in the NED assembly process minimize artifacts, permit edge matching, and fill sliver areas of missing data. The National Atlas also includes a Lambert Azimuthal Equal Area projection shaded relief file; this file is the same data in an Albers projection. This layer is part of the 1997-2014 edition National Atlas of the United States. The grayscale shaded relief images were developed to portray the terrain of the United States. They are intended for visual purposes only. The original NED data must be used for conducting analysis and determining elevation values. National Atlas of the United States. (2005). Grayscale Puerto Rico and the U.S. Virgin Islands Shaded Relief 200- Meter Resolution, Albers projection. National Atlas of the United States. Available at: http://purl.stanford.edu/vb513xp0680. The associated world file is included as part of the GeoTIFF. The contents of the world file are: >200.0000 >0.000000 >0.000000 >-200.0000 >-195900.0000 >437900.0000 The following projection file can be used when using ESRI's ArcGIS to view the GeoTIFF (any line breaks should be removed): PROJCS["Albers_NAD_1983_PRVI",GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0, 298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree", 0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting", 0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",- 66.5],PARAMETER["Standard_Parallel_1",8.0],PARAMETER ["Standard_Parallel_2",18.0],PARAMETER["Latitude_Of_Origin",15.0], UNIT["Meter",1.0]] 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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