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Chad Level 2 Administrative Boundaries, 1996
- Identification Information
- Data Quality Information
- Spatial Data Organization Information
- Spatial Reference Information
- Entity and Attribute Information
- Distribution Information
- Metadata Reference Information
- Identification Information
- Citation
- Originator
- United States. Agency for International Development
- Originator
- Famine Early Warning System Network
- Publication Date
- 1996
- Title
- Chad Level 2 Administrative Boundaries, 1996
- Edition
- 1
- Geospatial Data Presentation Form
- vector digital data
- Series Information
- Series Name
- FEWS 3
- Issue Identification
- 1
- Publication Information
- Publication Place
- Sioux Falls, SD, USA
- Publisher
- EDC/International Program
- Other Citation Details
- FEWS/EROS Data Center (EDC)
- Online Linkage
- http://www.columbia.edu/acis/eds/gis/images/fewsn_1996_chadadmn2.zip
- Abstract
- This ARC/INFO polygon coverage contains the second Level administrative boundaries at a 1:1000000 scale. The coverage is part of the Famine Early Warning System (FEWS) / Associates in Rural Development (ARD) African series. Chad is associated with the Sahel region in Africa.
- Purpose
- This data set is to be used in conjunction with other layers of Chad data. The data are intended to show the spatial distribution of the second Level administrative units for Chad. The data are to be used in modeling, targeting and demonstration project. The data are also used in natural resource management, inventory, change analysis, policy making, environmental awareness and land use planning.
- Supplemental Information
- Procedures_Used: The lowest Level map file (CHADU3.GIS) defines Sub-Prefectures within Chad and was generated from two Atlas Graphics .bna ASCII files, CHSUBCAN.BNA and CHSUBCAN2.BNA into ARC/INFO .gen format via a utility called CONVERT. Correct id-codes were then added into the coverage, and the coverage cleaned and built within ARC/INFO into a topologically correct polygonal file. Associated Sub-Prefecture names were added to the CHADU3.PAT file from a text via the ARC/INFO ADD and JOINITEM commands. The remaining coverages were created by aggregating polygons upward from the CHADU3.GIS coverage, using internal code assignments and the ARC/INFO DISSOLVE command. The resulting higher Level administrative files were successively built into topologically correct polygonal coverages, and attribute tables were updated to include pertinent information. In 1989, EDC replaced the international boundary with arcs from WDBII. All vertices of the international boundary match those of adjacent countries. In 1996 EDC replaced the WDBII international boundary with the boundary from the DCW. These country specific sub-national boundaries were then integrated into the DCW master country database using the ARC/INFO command UPDATE. The country specific data set, containing all of the sub-national hierarchy, was extracted from the DCW master data set using the ARC/INFO command RESELECT and the second Level administrative units were extracted from the country specific data set using the ARC/INFO command DISSOLVE. A master data set, based on the Digital Chart of the World (DCW) PONET layer, was created. Burkina Faso, Mali, Ethiopia, and Eritrea are included in the master data set, however, these countries have international boundaries that have been revised. The changes to Burkina Faso are: The Digital Chart of the World (DCW) International boundary was used for the International boundary for Burkina Faso with the only revisions being those listed below. From : -2 degrees; 55 minutes; 8 seconds Longitude and : 13 degrees;37 minutes; 37 seconds Latitude To : -0 degrees; 57 minutes; 41 seconds Longitude and : 14 degrees; 52 minutes; 14 seconds Latitude AND... From : 0 degrees; 3 minutes; 33 seconds Longitude and : 14 degrees; 58 minutes; 15 seconds Latitude To : 0 degrees; 13 minutes; 55 seconds Longitude and : 14 degrees; 58 minutes; 15 seconds Latitude These changes are defined by FEWS/ARD Washington, DC, USA. The changes to Mali are: The Digital Chart of the World (DCW) International boundary was used for the International boundary for Mali with the only revisions being those listed below. From : -2 degrees; 55 minutes; 8 seconds Longitude and : 13 degrees;37 minutes; 37 seconds Latitude To : -0 degrees; 57 minutes; 41 seconds Longitude and : 14 degrees; 52 minutes; 14 seconds Latitude AND... From : 0 degrees; 3 minutes; 33 seconds Longitude and : 14 degrees; 58 minutes; 15 seconds Latitude To : 0 degrees; 13 minutes; 55 seconds Longitude and : 14 degrees; 58 minutes; 15 seconds Latitude These changes are defined by FEWS/ARD Washington, DC, USA. The changes to Ethiopia are: The Digital Chart of the World (DCW) International boundary was used for the International boundary for Ethiopia with the only revisions being those listed below. From : 36 degrees; 34 minutes; 5 seconds Longitude and : 14 degrees; 14 minutes; 25 seconds Latitude To : 42 degrees; 25 minutes; 22 seconds Longitude and : 12 degrees; 26 minutes; 53 seconds Latitude These changes are defined by FEWS/ARD Washington, DC, USA. The changes to Eritrea are: The Digital Chart of the World (DCW) International boundary was used for the International boundary of Eritrea with the only revisions being those listed below: From : 36 degrees; 34 minutes; 5 seconds Longitude and : 14 degrees; 14 minutes; 25 seconds Latitude To : 42 degrees; 25 minutes; 22 seconds Longitude and : 12 degrees; 26 minutes; 53 seconds Latitude These changes are defined by FEWS/ARD Washington, DC, USA. The international boundary for Chad was extracted from an ARC/INFO LIBRARY created from the ARC/INFO version of the Digital Chart of the World (DCW) using the ARC/INFO tool LIBRARIAN. Revisions: During ARC/INFO coverage development modifications were made to the digital files to generate a database with a common scale, uniform Level of resolution, consistent coding scheme and comparable (standardized) measurement data. The only revision from the original data sets was the addition of certain attributes. Reviews_Applied_to_Data: Peer review, 03/96, FEWS/ARD Washington, D.C. Digital line work and attribute data checked for discrepancies and approved for release to FEWS in-country and regional field representatives. Related_Spatial_and_Tabular_Data_Sets: None Other_References_Cited: Environmental Systems Research Institute (ESRI), Inc. 1993, "Digital Chart of the World," (DCW), PONET Layer. ESRI, Redlands, CA, USA. Scale - 1:1000000. I'Institut Geographique National/Brazzaville, 1974, "Republique du Tchad." Scale - 1:1500000. Notes: USAID - United States Agency for International Development. FEWS - Famine Early Warning System ARD - Associates in Rural Development EDC - EROS Data Center USGS - United States Geological Survey IGN - I'Institut Geographique National
- Temporal Extent
- Currentness Reference
- The dates and sources used in the "Republique du Tchad" map are unknown. The map was published in 1974. The DCW database was originally published in 1992. Data currency varies from place to place depending on the currency of the Operational Navigation Charts (ONC). Chart currency ranged from the mid 1960s to the early 1990s. Compilation dates for every ONC chart are included in the database. The additional attributes were added in April of 1996 by the EROS Data Center (EDC).
- Time Period
- Beginning
- 1996
- End
- unknown
- Bounding Box
- West
- 13.473475
- East
- 24.002661
- North
- 23.450371
- South
- 7.441068
- Theme Keyword
- boundaries
- Theme Keyword Thesaurus
- ISO 19115 Topic Categories
- Theme Keyword
- Secondary administrative boundaries
- Borders
- Theme Keyword Thesaurus
- None
- Place Keyword
- Africa
- Chad
- Place Keyword Thesaurus
- Library of Congress Subject Headings
- Temporal Keyword
- 1996
- Temporal Keyword Thesaurus
- None
- Access Restrictions
- None
- Use Restrictions
- None
- Status
- Complete
- Maintenance and Update Frequency
- As needed.
- Point of Contact
- Contact Person
- Ron Smith
- Delivery Point
- EROS Data Center U.S. Geological Survey 47914 252nd Street
- City
- Sioux Falls
- State
- South Dakota
- Postal Code
- 57198-0001
- Country
- USA
- Contact Telephone
- (605) 594-6522
- Contact Facsimile Telephone
- (605) 594-6529
- Contact Electronic Mail Address
- rsmith@edcmail.cr.usgs.gov
- Hours of Service
- 0730 - 1615 CST
- Credit
- The USAID/FEWS Project and EDC International Program deserve credit for this data set.
- Native Data Set Environment
- Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780
- Cross-Reference
- Originator
- Environmental Systems Research Institute (ESRI), Inc.
- Publication Date
- 1993
- Publication Time
- 0000
- Title
- Digital Chart of the World (DCW), PONET Layer
- Edition
- Unknown
- Geospatial Data Presentation Form
- map
- Collection Title
- DCW
- Series Information
- Series Name
- Unknown
- Issue Identification
- None
- Publication Information
- Publication Place
- Redlands, CA, USA
- Publisher
- ESRI
- Other Citation Details
- Scale - 1:1000000
- Online Linkage
- http://www.esri.com
- Cross-Reference
- Originator
- 'I''Institut Geographique National/Brazzaville'
- Publication Date
- 1974
- Publication Time
- 0000
- Title
- Republique du Tchad, Carte Routiere
- Edition
- Unknown
- Geospatial Data Presentation Form
- map
- Series Information
- Series Name
- Unknown
- Issue Identification
- None
- Publication Information
- Publication Place
- Brazzaville, Congo
- Publisher
- IGN/Brazzaville
- Other Citation Details
- PubPlace:Africa/1:500000
- Online Linkage
- Unknown
- Data Quality Information
- Attribute Accuracy Report
- See Entity_Attribute_Information
- Quantitative Attribute Accuracy Assessment
- Logical Consistency Report
- Polygon topology present.
- Completeness Report
- All data were found to be topologically correct. No duplicate features are present. All polygons are closed, and all lines intersect where intended. No undershoots or overshoots are present. To the best knowledge of USAID/FEWS and EDC the data compiled in this data set meets the codes and/or procedures established for completeness and consistency.
- Horizontal Positional Accuracy Report
- The absolute horizontal accuracy of the DCW for all features derived from Operational Navigation Charts (ONC) is 2040 meters (6700 feet) rounded to the nearest 5 meters at 90% Circular Error (CE), World Geodetic System (WGS84). The absolute horizontal accuracy of the DCW for all features derived from Jet Navigation Charts (JNC) is 4270 meters (14006 feet) at 90% Circular Error.
- Quantitative Horizontal Positional Accuracy Assessment
- Lineage
- Source
- Originator
- I'Institut Geographique National/Brazzaville
- Publication Date
- 1974
- Title
- Republique du Tchad, Carte Routiere
- Source Scale Denominator
- 500000
- Type of Source Media
- Digital file
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 1974
- Source Currentness Reference
- The dates and sources used in the "Republique du Tchad" map are unknown. The map was published in 1974.
- Contribution
- Level 2 administrative boundary
- Source
- Originator
- Environmental Systems Research Institute (ESRI), Inc.
- Publication Date
- 1993
- Title
- Digital Chart of the World (DCW), PONET Layer
- Source Scale Denominator
- 1000000
- Type of Source Media
- CDROM
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 1993
- Source Currentness Reference
- The DCW database was originally published in 1992. Data currency varies from place to place depending on the currency of the Operational Navigation Charts (ONC). Chart currency ranged from the mid 1960s to the early 1990s. Compilation dates for every ONC chart are included in the database.
- Contribution
- International boundary
- Spatial Data Organization Information
- Direct Spatial Reference Method
- Vector
- Point and Vector Object Information
- SDTS Terms Description
- SDTS Point and Vector Object Type
- G-polygon
- Point and Vector Object Count
- 14
- Spatial Reference Information
- Horizontal Coordinate System Definition
- Geographic
- Latitude Resolution
- 0.000000
- Longitude Resolution
- 0.000000
- Geographic Coordinate Units
- Decimal degrees
- Geodetic Model
- Horizontal Datum Name
- D_Clarke_1880_RGS
- Ellipsoid Name
- Clarke_1880_RGS
- Semi-major Axis
- 6378249.145000
- Denominator of Flattening Ratio
- 293.465000
- Entity and Attribute Information
- Entity Type
- Entity Type Label
- CDADMN2.PAT
- Entity Type Definition
- Polygon Attribute Table
- Entity Type Definition Source
- FEWS/ARD Washington, DC, USA
- Attributes
- AREA
- Area of poly/region in square coverage units
- Positive real numbers
- Area of poly/region in square coverage units
- Definition Source
- Computed
- PERIMETER
- Perimeter of poly/region in coverage units
- Positive real numbers
- Perimeter of poly/region in coverage units
- Definition Source
- Computed
- CDADMN2#
- Internal feature number
- Sequential unique positive integer
- Internal feature number
- Definition Source
- Computed
- CDADMN2-ID
- User-assigned feature number
- Integer
- User-assigned feature number
- Definition Source
- User-defined
- ID
- Unique administrative unit code
- Character
- Unique administrative unit code
- Definition Source
- FEWS/ARD
- CNT-ABB
- Unique country abbreviation (http://www.nist.gov/itl/csl/fips/fips104.txtFederal Information Processing Standard (FIPS))
- Definition Source
- EDC
- ADMN2
- Second Level administrative unit names
- Character
- Second Level administrative unit names
- Definition Source
- FEWS/ARD
- NUM-CODE
- Unique numeric administrative units identifier
- Character
- Unique numeric administrative units identifier
- Definition Source
- EROS Data Center (EDC)
- REGION
- ARD defined region in Africa that Chad is associated with
- West Sahel African Region
- ARD defined region in Africa that Chad is associated with
- Definition Source
- FEWS/ARD
- FEWS-ABB
- Unique country abbreviation
- CH
- Unique country abbreviation
- Definition Source
- FEWS/ARD
- FEWSID
- Unique administrative unit identifier
- Character
- Unique administrative unit identifier
- Definition Source
- FEWS/ARD
- FEWSID2
- Unique identifier for the second Level administrative units
- Character
- Unique identifier for the second Level administrative units
- Definition Source
- FEWS/ARD
- Entity and Attribute Overview
- The item (ID) defines the unique administrative unit code, as defined by FEWS/ARD. The item (CNT-ABB) defines the unique country abbreviation, as defined by EDC. The item (ADMN2) defines the second Level administrative unit names, as defined by FEWS/ARD. The item (NUM-CODE) defines the unique numeric administrative unit identifier, as defined by EDC. The item (REGION) defines the African region that Chad is associated with, as defined by FEWS/ARD. The item (FEWS-ABB) defines the unique country abbreviation, as defined by FEWS/ARD. The item (FEWSID) defines the unique administrative unit identifier, as defined by FEWS/ARD. The item (FEWSID2) defines the unique identifiers for the second Level administrative units, as defined by FEWS/ARD.
- Distribution Information
- Online Access
- PC - http://edcintl.cr.usgs.gov/adds/c1/r4/cd/doc/admn/cdadmn2.exe UNIX - http://edcintl.cr.usgs.gov/adds/c1/r4/cd/doc/admn/cdadmn2.tar.gz
- Name
- Metadata Reference Information
- Metadata Date
- 20070522
- Metadata Contact
- Contact Information
- Contact Organization Primary
- Contact Organization
- Research Data Services (RDS), Columbia University Libraries
- Contact Person
- GIS/Metadata Librarian
- Contact Address
- Address
- 420 W. 118th St., 215 IAB, MC 3301
- City
- New York
- State or Province
- NY
- Postal Code
- 10027
- Country
- USA
- Contact Voice Telephone
- (212)854-6012
- Contact Electronic Mail Address
- data@library.columbia.edu
- Metadata Standard Name
- FGDC Content Standards for Digital Geospatial Metadata
- Metadata Standard Version
- FGDC-STD-001-1998
