9,766 results returned
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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: 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: Nighttime Lights of the World - Human Settlements, 1993
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements around the world observed during 1993. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 1993. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/qd234qc3826. 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: Nighttime Lights of the World - Human Settlements, 1994
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements around the world observed during 1994. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 1994. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/tn956rt0849. 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: Nighttime Lights of Asia - Human Settlements, 1994-1995
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements in Asia as observed during 1994-1995. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of Asia - Human Settlements, 1994-1995. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/qw719hj9004. 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: Nighttime Lights of the World - Human Settlements, 1992
Contributors:- Raster data
- 2009
Summary: This map shows the four types of light sources as observed during 1992. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 1992. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/cj972dx3146. 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: Nighttime Lights of the World - Human Settlements, 1999
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements around the world observed during 1999. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 1999. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/gb553qr3585. 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: Nighttime Lights of Africa - Human Settlements, 1994-1995
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements in Africa as observed during 1994-1995. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of Africa - Human Settlements, 1994-1995. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/zz035mh1404. 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: Nighttime Lights of the World - Human Settlements, 2000
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements around the world observed during 2000. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 2000. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/yp361yw6603. 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: Nighttime Lights of North America - Human Settlements, 1994-1995
Contributors:- Raster data
- 2009
Summary: This map shows the four types of light sources as observed in North America during 1994-1995. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of North America - Human Settlements, 1994-1995. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/vn581rh3345. 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: Nighttime Lights of the World - Human Settlements, 2003
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements around the world observed during 2003. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 2003. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/gm294gv1657. 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: Nighttime Lights of the World - Human Settlements, 1994-1995
Contributors:- Raster data
- 2009
Summary: The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. We have produced a global map of the four types of light sources as observed during a 6-month period in 1994 - 1995. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 1994-1995. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/ks847sb6288. 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: Nighttime Lights of the World - Human Settlements, 1995
Contributors:- Raster data
- 2009
Summary: This map shows the four types of light sources as observed during 1992. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 1995. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/gc463kk1275. 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: Nighttime Lights of the World - Human Settlements, 1996
Contributors:- Raster data
- 2009
Summary: This map shows the four types of light sources as observed during 1992. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 1996. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/kj818qk2341. 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: Nighttime Lights of Europe - Human Settlements, 1994-1995
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements in Europe as observed during 1994-1995. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of Europe - Human Settlements, 1994-1995. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/jz312rm6629. 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: Nighttime Lights of the World - Human Settlements, 1998
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements around the world observed during 1998. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 1998. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/ch107rj4927. 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: Nighttime Lights of the World - Human Settlements, 1997
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements around the world observed during 1997. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 1997. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/kr408yd8002. 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: Nighttime Lights of the World - Human Settlements, 2002
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements around the world observed during 2002. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 2002. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/rb315zy5960. 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: Nighttime Lights of West Asia - Human Settlements, 1994-1995
Contributors:- Raster data
- 2009
Summary: This map shows the four types of light sources as in Western Asia (the MIddle East) observed during 1994-1995. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of West Asia - Human Settlements, 1994-1995. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/zr640xp3042. 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: Nighttime Lights of the World - Human Settlements, 2001
Contributors:- Raster data
- 2009
Summary: This map shows light sources from human settlements around the world observed during 2001. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the detection of clouds using moonlight. In addition to moonlit clouds, the OLS also detects lights from human settlements, fires, gas flares, heavily lit fishing boats, lightning and the aurora. By analyzing the location, frequency, and appearance of lights observed in an image times series, it is possible to distinguish four primary types of lights present at the earth's surface: human settlements, fires, gas flares, and fishing boats. This layer is part of the Nighttime Lights of the World dataset, a satellite-based global inventory of human settlements, derived from nighttime data from the DMSP. This dataset is intended for researchers, students, and policy makers, and the general public 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 Geophysical and Solar-Terrestrial Data Center. (2003). Nighttime Lights of the World - Human Settlements, 2001. National Geophysical and Solar-Terrestrial Data Center. Available at: http://purl.stanford.edu/pn027dq9286. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.