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Global urban mask, delineating urban vs non-urban areas.

Identification_Information:

Citation:

Citation_Information:

Originator: Millennium Ecosystem Assessment

Originator: Center for International Earth Science Information Network (CIESIN)

Originator: International Food Policy Research Institute (IPFRI)

Originator: The World Bank

Originator: Centro Internacional de Agricultura Tropical (CIAT)

Publication_Date: 2004

Title: Global urban mask, delineating urban vs non-urban areas.

Geospatial_Data_Presentation_Form: Maps data

Publication_Information:

Publication_Place: Palisades, NY (US)

Publisher: CIESIN, Columbia University

Other_Citation_Details: Associated file: GLUREXTENTS

Online_Linkage:: http://beta.sedac.ciesin.columbia.edu/gpw

Description:

Abstract:

The Urban Extents database is part of the Global Rural-Urban Mapping Project (GRUMP): Gridded Population of the World, version 3, with Urban Reallocation (GPW-UR), this database provides estimates of the extent of rural and urban land areas on a 30 arc-second grid for the world (excluding Antarctica) by country, continent, or as a global grid. The database is comprised of:

- GLDSU00AGR: population density in 2000, adjusted to match UN totals, persons/sq km * 10, rounded to the nearest integer. The multiplication factor is required to preserve precision in integer format.

- GLUP00AGR: population counts in 2000, adjusted to match UN totals, rounded to the nearest integer

- GLUAREAGR: mean land area in hectares, rounded to the nearest integer

- GLUMADMGR: mean administrative unit area (population weighted) in hectares, rounded to the nearest integer. These data are useful for evaluating the effective resolution of the input data (the size of the administrative unit area).

- GLUREXTENTS: urban mask, delineating urban vs non-urban areas.

This the alpha version of Global Rural-Urban Mapping Project (GRUMP): Urban Extents data set. An updated version will be available in 2005 from <http://beta.sedac.ciesin.columbia.edu/gpw>. If you discover any errors or have any issues with the alpha data, please let us know at gpw@ciesin.columbia.edu.

Purpose:: Allow analysis of urban and rural population figures based on a consistent global data set.

Time_Period_of_Content:

Time_Period_Information:

Single_Date_Time:

Calendar_Date: 1995

Currentness_Reference: ground condition

Status:

Progress: In work

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Description_of_Geographic_Extent: Global

Bounding_Coordinates:

West_Bounding_Coordinate: -180.0

East_Bounding_Coordinate: 180.0

North_Bounding_Coordinate: 84.97593

South_Bounding_Coordinate: -57.00000

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Population distribution

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: population size

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: GRUMP

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: global population

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: population density

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: population estimates

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: GPW

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: urban

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: populated

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: cities

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Global

Access_Constraints:: Unrestricted access and use of data without charge, unless specified in the documentation for particular data. All other rights are reserved.

Use_Constraints:: The Trustees of Columbia University in the City of New York, the International Food Policy Research Institute (IPFRI), the World Bank, and the Centro Internacional de Agricultura Tropical (CIAT) hold the copyright of this dataset. Users are prohibited from any commercial, non-free resale, or redistribution without explicit written permission from the copyright holders. Users should acknowledge CIESIN, IFPRI, the World Bank, and CIAT as the source used in the creation of any reports, publications, new data sets, derived products, or services resulting from the use of this data set. The authors also request reprints of any publications and notification of any redistributing efforts.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Socioeconomic Data and Applications Center (SEDAC) User Services

Contact_Address:

Address_Type: mailing and physical

Address: CIESIN, Columbia University, 61 Route 9W, P.O. Box 1000

City: Palisades

State_or_Province: NY

Postal_Code: 10964

Country: U.S.

Contact_Voice_Telephone: +1 845-365-8920

Contact_Facsimile_Telephone: +1 845-365-8922

Contact_Electronic_Mail_Address: ciesin.info@ciesin.columbia.edu

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The primary source of data for identifying urban areas is the Nighttime Lights data set from the Defense Meteorological Satellite Program (DMSP). Given the variability of lighted areas, the urban extents tend to be overestimated in areas that are completely electrified (e.g., North America, Europe) and underestimated in areas that are poorly electrified or lighted by other sources (e.g., parts of Africa and Asia). In addition, areas detected in the Nighttime Lights data that have no associated populated place information are classified as rural, which likely results in missing urban areas

Population density in 2000, adjusted to match United Nations totals.

<http://beta.sedac.ciesin.columbia.edu/gpw>. If you discover any errors or have any issues with the alpha data, please let us know at gpw@ciesin.columbia.edu.

Logical_Consistency_Report: Not applicable

Completeness_Report:: Anctarctica was excluded
<http://beta.sedac.ciesin.columbia.edu/gpw>. If you discover any errors or have any issues with the alpha data, please let us know at gpw@ciesin.columbia.edu.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:: The urban-rural extents layer is based on multiple sources of data, including the Defense Meterological Satellite Program (DMSP) Nighttime Lights of the World (1994-1995), the Digital Chart of the World, tactical Pilotage Charts and urban extents estimated from points using buffers. The spatial accurcy both within and among these data sources varies, as does the accuracy of the resulting urban-rural surface. The data are only appropriate for analysis at the regional and global scales (scales of 1:1 million or smaller)

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: National Geophysical Data Center (comp).

Publication_Date: 2004

Title: Nighttime Lights of the World

Geospatial_Data_Presentation_Form: raster digital data

Publication_Information:

Publication_Place: Boulder, CO

Publisher: National Geophysical Data Center

Online_Linkage: http://sabr.ngdc.noaa.gov

Type_of_Source_Media: online

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates_Times:

Beginning_Date: 1994

Ending_Date: 1995

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: NLW

Source_Contribution:: Human settlements,derived from nighttime data from the Defense Meteorological SatelliteProgram (DMSP)

Source_Information:

Source_Citation:

Citation_Information:

Originator:: Center for International Earth Science Information Network (CIESIN), Columbia University; International Food Policy Research Institute (IFPRI), the World Bank; and Centro Internacional de Agricultura Tropical (CIAT).

Publication_Date: 2004

Title: Global Rural-Urban Mapping Project (GRUMP): Urban Extents

Geospatial_Data_Presentation_Form: Maps data

Publication_Information:

Publication_Place: Palisades, NY

Publisher: CIESIN, Columbia University

Online_Linkage:: http://sedac.ciesin.columbia.edu/gpw.

Type_of_Source_Media: online

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates_Times:

Beginning_Date: 1990

Ending_Date: 2000

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: GRUMP

Source_Contribution: urban extents

Process_Step:

Process_Description:: The urban extents are created by in a four-step process. First, the DMSP Nighttime Lights are converted to vector polygons on a country by country basis and any urban areas from the Digital Chart of the World or Tactical Pilotage Charts (where available) are added to the lighted polygons. Second, the population from the GRUMP settlement points are aggregated to the polygons. Third, settlements that do no fall inside polygons have extents estimated and polygons with a population of less than 5,000 persons are discarded. Fourth, the polygons are combined with the country extents from the Digital Chart of the World or other sources and converted to a raster surface where the value 1 represents rural and the value 2 represents urban

Source_Used_Citation_Abbreviation: NLW, GRUMP

Process_Date: Unknown

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 17160

Column_Count: 43200

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geodetic_Model:

Horizontal_Datum_Name: World Geodetic System of 1984

Ellipsoid_Name: World Geodetic System of 1984

Semi_major_Axis: 6378137

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: glurextents

Entity_Type_Definition: urban mask: urban vs non-urban areas

Entity_Type_Definition_Source: unknown

Attribute:

Attribute_Label: ObjectID

Attribute_Definition: internal feature number

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated

Attribute:

Attribute_Label: Value

Attribute_Definition: 1 = rural, 2 = urban

Attribute_Definition_Source: unknown

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1

Enumerated_Domain_Value_Definition: Rural

Enumerated_Domain_Value_Definition_Source: unknown

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 2

Enumerated_Domain_Value_Definition: Urban

Enumerated_Domain_Value_Definition_Source: unknown

Attribute:

Attribute_Label: Count

Attribute_Definition: unknown (type: double)

Attribute_Definition_Source: unknown

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 5371015

Range_Domain_Maximum: 215380804

Overview_Description:

Entity_and_Attribute_Overview: mean rural and urban administrative unit area in hectares

Entity_and_Attribute_Detail_Citation:: http://beta.sedac.ciesin.columbia.edu/gpw/

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Paul Mackie

Contact_Organization: World Resources Institute

Contact_Position: Media Officer

Contact_Address:

Address_Type: mailing and physical

Address: 10 G Street, NE

City: Washington

State_or_Province: DC

Postal_Code: 20002

Country: USA

Contact_Voice_Telephone: (202) 729-7684

Contact_Facsimile_Telephone: (202) 729-7616

Contact_Electronic_Mail_Address: pmackie@wri.org

Distribution_Liability: none

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ESRI-ArcCatalog

Format_Version_Number: 9.1.0.722

File_Decompression_Technique: WinZIp-RAR

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:: http://wdc.nbii.gov/ma/datapage.htm

Fees: The online copy of the dataset may be accesed without charge

Metadata_Reference_Information:

Metadata_Date: 20070228

Metadata_Review_Date: 20070326

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Arturo Restrepo

Contact_Organization:: National Aeronautics and Space Administration (NASA) Global Change Master Directory (GCMD)

Contact_Position: Ecological Informatics Coordinator

Contact_Address:

Address_Type: mailing and physical

Address: Goddard Corporate Park

Address: 7515 Mission Drive

Address: Suite A1-C1

City: Lanham

State_or_Province: MD

Postal_Code: 20706

Country: U.S.

Contact_Voice_Telephone: 301-352-4616

Metadata_Standard_Name:: FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001.1-1999