5,610 results returned
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Title: CalWater 2.2 Watersheds
Contributors:- Polygon data
- 2010
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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Title: Air Monitoring Stations: California, 2002-2004
Contributors:- Point data
- 2013
- Stephen P. Teale Data Center (Calif.).
- California. Air Resources Board. Planning and Technical Support Division
Summary: This point shapefile represents all air monitoring stations active in California from 2001 until 2003. The data within the shapefile was obtained from the Air Resources Board's Ambient Air Quality Data Summaries (ADAM) database. Developed for the California Air Resources Board (ARB) GIS data library. Teale Data Center GIS Lab. California Air Resources Board. (2013). Air Monitoring Stations: California, 2002-2004. California Air Resources Board. Available at: http://purl.stanford.edu/bs277kf6370. ADAM is the official database that stores regulatory air quality data for ARB. 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: Air Monitoring Stations: California, 2001-2003
Contributors:- Point data
- 2013
- Stephen P. Teale Data Center (Calif.).
- California. Air Resources Board. Planning and Technical Support Division
Summary: This point shapefile represents all air monitoring stations active in California from 2001 until 2003. The data within the shapefile was obtained from the Air Resources Board's Ambient Air Quality Data Summaries (ADAM) database. Developed for the California Air Resources Board (ARB) GIS data library. Teale Data Center GIS Lab. California Air Resources Board. (2013). Air Monitoring Stations: California, 2001-2003. California Air Resources Board. Available at: http://purl.stanford.edu/zv296hf8888. ADAM is the official database that stores regulatory air quality data for ARB. 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: Hydrogen Sulfide: California State Area Designations, 2008-2011
Contributors:- Polygon data
- 2011
- Stephen P. Teale Data Center (Calif.).
- California. Air Resources Board. Planning and Technical Support Division
Summary: This polygon shapefile contains area designations of hydrogen sulfide levels in California as required under Health and Safety Code section 39608. The designations are consistent with the criteria established in the California Code of Regulations, title 17, sections 70300 through 70306, and Appendices 1 through 3, thereof. There are four possible designation categories: attainment, nonattainment, nonattainment-transitional, and unclassified. Nonattainment areas are geographic areas which have not met National Ambient Air Quality Standards for hydrogen sulfide air pollution. The State area designations are reviewed annually and approved by the State Air Resources Board. Projection: Teale Albers, NAD83 This shapefile can be used to identify hydrogen sulfide pollution area designations from the prior three-year period (2008-2011) in accordance with the California State Ambient Air Quality Standard. Teale Data Center GIS Lab. California Air Resources Board. (2011). Hydrogen Sulfide: California State Area Designations, 2008-2011. California Air Resources Board. Available at: http://purl.stanford.edu/gg486xq1023. The State area designations are reviewed annually and approved by the State Air Resources Board. In 2011, staff did not propose any changes to the State hydrogen sulfide designations. Updated: 02/22/11 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: Visibility Reducing Particles: California State Area Designations, 2008-2011
Contributors:- Polygon data
- 2011
- Stephen P. Teale Data Center (Calif.).
- California. Air Resources Board. Planning and Technical Support Division
Summary: This polygon shapefile shows area designations in California as required under Health and Safety Code section 39608 for ozone, nitrogen dioxide, sulfur dioxide, lead, and visibility reducing particles. Visibility-reducing particles consist of suspended particulate matter, which is a complex mixture of tiny particles that consists of dry solid fragments, solid cores with liquid coatings, and small droplets of liquid. These particles vary greatly in shape, size and chemical composition, and can be made up of many different materials such as metals, soot, soil, dust, and salt. The designations are consistent with the criteria established in the California Code of Regulations, title 17, sections 70300 through 70306, and Appendices 1 through 3, thereof. There are three possible designation categories for lead (attainment, nonattainment, and unclassified), and there are four possible designation categories for ozone, nitrogen dioxide, sulfur dioxide, and visibility reducing particles (attainment, nonattainment, nonattainment-transitional, and unclassified). In addition, ozone nonattainment areas have been assigned a classification, commensurate with the severity of their air quality problem, under Health and Safety Code section 40921.5. The State area designations are reviewed annually and approved by the State Air Resources Board. Projection: Teale Albers, NAD83 This shapefile can be used to identify visibility reducing particle area designations from the prior three-year period (2008-2011) in accordance with the California State Ambient Air Quality Standard. Teale Data Center GIS Lab. California Air Resources Board. (2011). Visibility Reducing Particles: California State Area Designations, 2008-2011. California Air Resources Board. Available at: http://purl.stanford.edu/hq194zr5022. Available at: http://purl.stanford.edu/hq194zr5022. The State area designations are reviewed annually and approved by the State Air Resources Board. In February 2011, the staff proposed a number of changes for ozone. The Board approved the proposed changes at a public hearing in May 2011. The Office of Administrative Law (OAL) approved and filed the 2011 State Area Designations rulemaking on September 8, 2011. The regulations became effective on October 8, 2011. Updated: 11/28/11 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: California Air Districts, 2004
Contributors:- Polygon data
- 2004
- California Air Resources Board. Planning and Technical Support Division
- Stephen P. Teale Data Center (Calif.).
Summary: The California Air Districts layer is a polygon shapefile coverage representing the California air pollution control and air quality management districts, as defined in federal and state law. See 40 CFR, Chapter I Section 81, et seq., and California Health and Safety Code, Section 40000 et seq. Air districts identify the local and regional authorities who have primary responsibility for control of air pollution from sources that are not motor vehicles. This layer shows the air district boundaries and their names as of March 2004. Air Districts are designated pursuant to federal and state statute. Air districts identify the local and regional authorities who have primary responsibility for control of air pollution from sources that are not motor vehicles. (Motor vehicles are the responsibility of the state Air Resources Board.) Teale Data Center GIS Lab. California Air Resources Board. (2004). California Air Districts, 2004. California Air Resources Board. Available at: http://purl.stanford.edu/vc226fs6069. 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: California Air Basins, 2004
Contributors:- Polygon data
- 2004
- California. Air Resources Board. Planning and Technical Support Division
- Stephen P. Teale Data Center (Calif.).
Summary: The California Air Basins layer is a polygon shapefile coverage representing the 15 California air basins, as defined in state statute and regulation. This data layer shows the air basin boundaries and their names, as of March 2004. Air Basins are designated pursuant to California statute and regulation. See the California Health and Safety Code, Section 39606 et seq. and California Code of Regulations, Title 17, Section 60100 et seq. Air Basins identify regions of similar meteorological and geographic conditions and consideration for political boundary lines, and are related to air pollution and its transport. Teale Data Center GIS Lab. California Air Resources Board. (2004). California Air Basins, 2004. California Air Resources Board. Available at: http://purl.stanford.edu/pn391fn7822. 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: California Counties: Air Resources Board, 2004
Contributors:- Polygon data
- 2004
- Stephen P. Teale Data Center (Calif.).
- California Air Resources Board. Planning and Technical Support Division
Summary: This polygon shapefile California represents the California county boundaries at moderate spatial resolution, aligned to match well with the ARB California Air Basins and California Air Districts polygon boundary shapefiles. This shapefile is aligned to match well with the ARB California Air Basins and California Air Districts polygon boundary shapefiles. It is not intended to replace more spatially detailed county boundary layers available elsewhere. Teale Data Center GIS Lab. California Air Resources Board. (2004) California Counties: Air Resources Board, 2004. California Air Resources Board. Available at: http://purl.stanford.edu/qy535rr9441. 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: One-Hour Ozone Areas: Federal Designations, California, 2003
Contributors:- Polygon data
- 2003
- California Air Resources Board. Planning and Technical Support Division
- Stephen P. Teale Data Center (Calif.).
Summary: This polygon shapefile contains federal one-hour ozone area designations and their classifications as per 40CFR81.305, part of the National Ambient Air Quality Standard (NAAQS) which monitors pollutants in accordance with the Clean Air Act. There are three designation categories: nonattainment, unclassifiable and attainment areas. Non-attainment areas are those which are in violation of the standard. Nonattainment areas have various classifications. Each designation and classification area has an associated date field that represents the "effective" date of the action as published in 40CFR81.305. This data layer is current as of November 2003. Projection: Teale Albers, NAD83 This shapefile can be used to identify designation areas for ozone pollution attainment defined pursuant to the corresponding federal National Ambient Air Quality Standard for each pollutant as per the Clean Air Act. Teale Data Center GIS Lab. California Air Resources Board. (2003). One-Hour Ozone Areas: Federal Designations, California, 2003. California Air Resources Board. Available at: http://purl.stanford.edu/tq104yf5887. 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: Federal Particulate Matter (PM10) Area Designations: California, 2003
Contributors:- Polygon data
- 2003
- California Air Resources Board. Planning and Technical Support Division
- Stephen P. Teale Data Center (Calif.).
Summary: This polygon shapefile displays particulate matter < 10 microns (PM 10) area designations pursuant to 40CFR81.305, the federal national ambient air quality standard which monitors pollutants in accordance with the Clean Air Act. There are three designation categories: nonattainment, unclassifiable and attainment areas. Non-attainment areas are those which are in violation of the standard. Nonattainment areas have various classifications. Each designation and classification area has an associated date field that represents the "effective" date of the action as published in 40CFR81.305. This data layer is current as of November 2003. Projection: Teale Albers, NAD83 Designation areas are defined purThis shapefile can be used to identify designation areas that are defined pursuant to the corresponding federal national ambient air quality standard for inhalable coarse particles (PM 10) as per the Clean Air Act.suant to the corresponding federal national ambient air quality standard for each pollutant as per the Clean Air Act. Teale Data Center GIS Lab. California Air Resources Board. (2003). Federal Particulate Matter (PM10) Area Designations: California, 2003. California Air Resources Board. Available at: http://purl.stanford.edu/gn558bp2442. 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: 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: 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: isohyetal_cnty
Contributors:- Polygon data
- 1997
Summary: COVERAGE DESCRIPTION: The 'PRECIPITATION' layer represents lines of equal rainfall (isohyets) based on long-term mean annual precipitation data compiled from USGS, California Department of Water Resources,and California Division of Mines map and information sources. Source maps are based primarily on U.S. Weather Service data for approximately 800 precipitation stations. In the Los Angeles and San Francisco Bay areas the USWS data has been supplemented by county and local agency precipitation data. The data was collected over a sixty year period (1900-1960). Minimum mapping unit is 1000+ acres. The isohyetal contour intervals are variable due to the degree of variation of annual precipitation with horizontal distance.
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Title: HYDRO 1K Elevation Derivative Database
Contributors:- Polygon data
- 2018
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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Title: Grayscale Alaska Shaded Relief, 200-Meter Resolution, Albers projection
Contributors:- Raster data
- 2006
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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Title: Grayscale Hawaii Shaded Relief - 200-Meter Resolution, Albers projection
Contributors:- Raster data
- 2005
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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Title: Grayscale Puerto Rico and the U.S. Virgin Islands Shaded Relief 200- Meter Resolution, Albers projection
Contributors:- Raster data
- 2005
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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Title: Grayscale Conterminous United States Shaded Relief, 200-Meter Resolution, Albers projection
Contributors:- Raster data
- 2005
Summary: The grayscale conterminous United States shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of the conterminous United States 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 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 Conterminous United States Shaded Relief, 200-Meter Resolution, Albers projection. National Atlas of the United States. Available at: http://purl.stanford.edu/jb375gc5613. 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: Grayscale Alaska Shaded Relief - 200-Meter Resolution
Contributors:- Raster data
- 2005
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. 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 Alaska Shaded Relief - 200-Meter Resolution. National Atlas of the United States. Available at: http://purl.stanford.edu/sb465jq2544. 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 >-4451900.0000 >4175900.0000 The following projection file can be used when using ESRI's ArcGIS to view the GeoTIFF (any line breaks should be removed): PROJCS["NAD_1983_Lambert_Azimuthal_Equal_Area",GEOGCS ["GCS_Sphere_ARC_INFO",DATUM["D_Sphere_ARC_INFO",SPHEROID ["Sphere_ARC_INFO",6370997.0,0.0]],PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]],PROJECTION ["Lambert_Azimuthal_Equal_Area"],PARAMETER["False_Easting",0.0], PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian", -100.0],PARAMETER["Latitude_Of_Origin",45.0],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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Title: Grayscale North America Shaded Relief 1-Kilometer Resolution
Contributors:- Raster data
- 2005
Summary: The grayscale North America shaded relief data were derived from the GTOPO30 elevation data. GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). GTOPO30 was derived from several raster and vector sources of topographic information. It was developed between 1993 and 1996 through a collaborative effort led by staff at the U.S. Geological Survey's Center for EROS. The following organizations participated by contributing funding or source data: the National Aeronautics and Space Administration (NASA), the United Nations Environment Programme/Global Resource Information Database (UNEP/GRID), the U.S. Agency for International Development (USAID), the Instituto Nacional de Estadistica Geografica e Informatica (INEGI) of Mexico, the Geographical Survey Institute (GSI) of Japan, Manaaki Whenua Landcare Research of New Zealand, and the Scientific Committee on Antarctic Research (SCAR). This layer is part of the 1997-2014 edition of the National Atlas of the United States. The grayscale shaded relief image were developed to portray the terrain of North America. It is intended for visual purposes only. The original GTOPO30 data must be used for conducting analysis and determining elevation values. National Atlas of the United States. (2005). Grayscale North America Shaded Relief 1-Kilometer Resolution. National Atlas of the United States. Available at: http://purl.stanford.edu/zz581px0362. The associated world file is included as part of the GeoTIFF. The contents of the world file are: >1000.0000 >0.000000 >0.000000 >-1000.0000 >-6086629.0000 >4488761.0000 The following projection file can be used when using ESRI's ArcGIS to view the GeoTIFF (any line breaks should be removed): PROJCS["NAD_1983_Lambert_Azimuthal_Equal_Area",GEOGCS ["GCS_Sphere_ARC_INFO",DATUM["D_Sphere_ARC_INFO",SPHEROID ["Sphere_ARC_INFO",6370997.0,0.0]],PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]],PROJECTION ["Lambert_Azimuthal_Equal_Area"],PARAMETER["False_Easting",0.0], PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian", -100.0],PARAMETER["Latitude_Of_Origin",45.0],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.