METADATA FOR Chad, Africa Roads
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Identification Information
Spatial Reference
Status Information
Metadata Reference Section
Source Information
Processing History Information
Distribution Information
Contact Information
Entity/Attribute Information
Data Set Description
- Data_Set_Identity:
- CDROADSC -- Road Network for Chad
- Identification_Code:
- N/A
- Theme_Keyword:
- Roads
- Thematic_Accuracy:
- See Attribute Descriptions
- Thematic_Accuracy_Explanation:
- See Attribute Descriptions
- Completeness:
- See Data_Set_Description
- Data_Set_Citation:
- I'Institut Geographique National (IGB)/Brazzaville, 1974,
Republique du Tchad, Carte Routiere.
- Native_Data_Set_Environment:
- UNIX
- Use_Restrictions:
- See Data_Set_Description
- Access_Restrictions:
-
- Security_Classification:
- UNCLASSIFIED
- Native_Data_Set_Structure:
- ARC/INFO COVER
- Horizontal_Coordinate_System:
- geographic
- Geographic_Coordinate_Units:
- DD
- Horizontal_Datum_Name:
- NAD27
- Ellipsoid_Name:
- CLARKE1880
- Vertical_Datum_Name:
- NGVD29
- X-Shift:
- 0.0000000000
- Y-Shift:
- 0.0000000000
- Point/Vector_Object_Information:
-
- Number of points: 0
- Number of lines: 90
- Number of line segments: 2630
- Number of polygons: 0
- Point_Object_Information:
-
- Number of control points: 936
- Horizontal_Positional_Accuracy:
- N/A
- Horizontal_Positional_Accuracy_Explanation:
- N/A
- Vertical_Positional_Accuracy:
- N/A
- Vertical_Positional_Accuracy_Explanation:
- N/A
- West_Bounding_Coordinate:
- 13.7912
- East_Bounding_Coordinate:
- 22.8100
- North_Bounding_Coordinate:
- 23.2988
- South_Bounding_Coordinate:
- 7.5222
- Data_Set_G-Polygon_Outer_G-Ring:
- N/A
- Data_Set_G-Polygon_Exclusion_G-Ring:
- N/A
- Geographic_Keyword_Name:
- Chad, Africa
- Geographic_Keyword_Type:
- Location
- Data_Set_Status:
-
- Release_Date:
- N/A
- Maintenance_and_Update_Frequency:
- N/A
- Metadata_Date:
- 950323.125409
- Metadata_Review_Date:
- N/A
- Metadata_Future_Review_Date:
- N/A
- Metadata_Contact:
- cjohnson
- Source_Identity:
I'Institut Geographique National (IGB)/Brazzaville, 1974,
Republique du Tchad, Carte Routiere.
Per Process Step
- Process_Description:
- EXTERNALALL
- Process_Date:
- 08/10/1992 (MDY)
- Process_Time:
- 10:55
- Process_Description:
- EXPORT COVER CDROADS CDROADS FULL
- Process_Date:
- 08/10/1992 (MDY)
- Process_Time:
- 10:58
- Process_Description:
- EXPORT COVER CDROADS CDROADS NONE
- Process_Date:
- 03/29/1993 (MDY)
- Process_Time:
- 10:10
- Process_Description:
- EXTERNALALL
- Process_Date:
- 05/16/1994 (MDY)
- Process_Time:
- 7:11
- Process_Description:
- EXTERNALALL
- Process_Date:
- 06/03/1994 (MDY)
- Process_Time:
- 13:21
- Process_Description:
- PROJECT COVER CDROADS CDROADSG GEO2GEO.PRJ
- Process_Date:
- 06/03/1994 (MDY)
- Process_Time:
- 14:54
- Process_Description:
- BUILD CDROADSG LINE
- Process_Date:
- 06/03/1994 (MDY)
- Process_Time:
- 14:54
- Process_Description:
- EXTERNALALL
- Process_Date:
- 06/08/1994 (MDY)
- Process_Time:
- 8:18
- Process_Description:
- DOCUMENT CDROADSG CREATE CJOHNSON
- Process_Date:
- 06/14/1994 (MDY)
- Process_Time:
- 16:47
- Process_Description:
- DOCUMENT CDROADSG UPDATE CJOHNSON
- Process_Date:
- 06/15/1994 (MDY)
- Process_Time:
- 9:46
- Process_Description:
- EXTERNALALL
- Process_Date:
- 08/01/1994 (MDY)
- Process_Time:
- 10:10
- Process_Description:
- EXTERNALALL
- Process_Date:
- 08/02/1994 (MDY)
- Process_Time:
- 7:49
- Process_Description:
- RENAME CDROADSG CDROADS
- Process_Date:
- 08/02/1994 (MDY)
- Process_Time:
- 8:30
- Process_Description:
- DOCUMENT CDROADS UPDATE RSMITH
- Process_Date:
- 08/15/1994 (MDY)
- Process_Time:
- 13:54
- Process_Description:
- CLIP CDROADS CDADMIN1 CDROADSC LINE
- Process_Date:
- 08/24/1994 (MDY)
- Process_Time:
- 14:30
- Process_Description:
- DOCUMENT CDROADSC UPDATE RSMITH
- Process_Date:
- 08/30/1994 (MDY)
- Process_Time:
- 9:20
- Process_Description:
- DOCUMENT CDROADSC UPDATE RSMITH
- Process_Date:
- 08/30/1994 (MDY)
- Process_Time:
- 9:20
- Process_Description:
- EXPORT COVER CDROADSC /DG1/IPSARCH/COUNTRY/CD/ARC/CDEXP/CDROADSC.E00 NONE
- Process_Date:
- 08/30/1994 (MDY)
- Process_Time:
- 10:14
- Process_Description:
- IMPORT COVER CDROADSC.E00 /DG1/IPSARCH/PROJECTS/CDROM/CDCOVS/CD/CDROADSC
- Process_Date:
- 03/17/1995 (MDY)
- Process_Time:
- 11:33
- Process_Description:
- DOCUMENT CDROADSC DELETE CJOHNSON
- Process_Date:
- 03/23/1995 (MDY)
- Process_Time:
- 12:51
- Process_Description:
- DOCUMENT CDROADSC COPY /DG1/IPSARCH/COUNTRY/CD/ARC/CDLIB/DATABASE/ROADS CJOHNSON
- Process_Date:
- 03/23/1995 (MDY)
- Process_Time:
- 12:52
- Process_Description:
- DOCUMENT CDROADSC UPDATE CJOHNSON
- Process_Date:
- 03/23/1995 (MDY)
- Process_Time:
- 12:54
- Distribution_Contact:
- Ron Smith, EROS Data Center - USGS
- Distribution_Liability:
- N/A
- Transfer_Options:
- N/A
- Transfer_Instructions:
- N/A
- Fees:
- N/A
- Turnaround:
- N/A
- Contact_Organization:
- EROS Data Center - USGS
- Contact_Person:
- Ron Smith
- Contact_Position:
- N/A
- Contact_Mailing Address:
- N/A
- Contact_Physical Location:
- N/A
- Contact_Voice_Telephone:
- N/A
- Contact_Facsimile_Telephone:
- N/A
- Contact_Electronic_Mail_Address:
- N/A
- Contact_Instructions:
- FTS: (605) 594-6522 / E-MAIL: rsmith@edcserver1.cr.usgs.gov
- Data_Base_Identity:
- CDROADSC
- Partition_Identity:
- N/A
Entity_Type_label: CDROADSC.AAT
---------------------------------
Entity_Type_Definition: Arc Attribute Table
Entity_Type_Definition_Source: IGB/Brazzaville
Number_of_Attributes_in_Entity: 8
Attribute_Label: FNODE#
Attribute_Definition: Internal number of from-node
Attribute_Definition_Source: Computed
EA_Domain_Values: Sequential unique positive integer
EA_Units_of_Measure: N/A
EA_Measurement_Precision: N/A
EA_Beginning_Date: N/A
EA_Ending_Date: N/A
EA_Accuracy: N/A
EA_Accuracy_Explanation: N/A
EA_Measurement_Frequency: N/A
Attribute_Label: TNODE#
Attribute_Definition: Internal number of to-node
Attribute_Definition_Source: Computed
EA_Domain_Values: Sequential unique positive integer
EA_Units_of_Measure: N/A
EA_Measurement_Precision: N/A
EA_Beginning_Date: N/A
EA_Ending_Date: N/A
EA_Accuracy: N/A
EA_Accuracy_Explanation: N/A
EA_Measurement_Frequency: N/A
Attribute_Label: LPOLY#
Attribute_Definition: Internal number of polygon to left of arc
Attribute_Definition_Source: Computed
EA_Domain_Values: Sequential unique positive integer
EA_Units_of_Measure: N/A
EA_Measurement_Precision: N/A
EA_Beginning_Date: N/A
EA_Ending_Date: N/A
EA_Accuracy: N/A
EA_Accuracy_Explanation: N/A
EA_Measurement_Frequency: N/A
Attribute_Label: RPOLY#
Attribute_Definition: Internal number of polygon to right of arc
Attribute_Definition_Source: Computed
EA_Domain_Values: Sequential unique positive integer
EA_Units_of_Measure: N/A
EA_Measurement_Precision: N/A
EA_Beginning_Date: N/A
EA_Ending_Date: N/A
EA_Accuracy: N/A
EA_Accuracy_Explanation: N/A
EA_Measurement_Frequency: N/A
Attribute_Label: LENGTH
Attribute_Definition: Length of arc in coverage units
Attribute_Definition_Source: Computed
EA_Domain_Values: Positive real numbers
EA_Units_of_Measure: N/A
EA_Measurement_Precision: N/A
EA_Beginning_Date: N/A
EA_Ending_Date: N/A
EA_Accuracy: N/A
EA_Accuracy_Explanation: N/A
EA_Measurement_Frequency: N/A
Attribute_Label: CDROADSC#
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Computed
EA_Domain_Values: Sequential unique positive integer
EA_Units_of_Measure: N/A
EA_Measurement_Precision: N/A
EA_Beginning_Date: N/A
EA_Ending_Date: N/A
EA_Accuracy: N/A
EA_Accuracy_Explanation: N/A
EA_Measurement_Frequency: N/A
Attribute_Label: CDROADSC-ID
Attribute_Definition: User-assigned feature number
Attribute_Definition_Source: User-defined
EA_Domain_Values: Integer
EA_Units_of_Measure: N/A
EA_Measurement_Precision: N/A
EA_Beginning_Date: N/A
EA_Ending_Date: N/A
EA_Accuracy: N/A
EA_Accuracy_Explanation: N/A
EA_Measurement_Frequency: N/A
Attribute_Label: RANK
Attribute_Definition: Road Classification Item
Attribute_Definition_Source: IGB/Brazzaville
EA_Domain_Values: Integer
EA_Units_of_Measure: N/A
EA_Measurement_Precision: N/A
EA_Beginning_Date: N/A
EA_Ending_Date: N/A
EA_Accuracy: N/A
EA_Accuracy_Explanation: N/A
EA_Measurement_Frequency: N/A
1. Abstract
This coverage graphically depicts the transportation infrastructure
of Chad.
Descriptors: Chad, Africa, Roads, Transportation
2. Applications that use this data
Modeling, targeting, and demonstration projects.
2.1 Intended use of data
Used in network analysis and to depict spatial locations.
2.2 Limitations of data
This coverage should not be used for navigation or for producing
maps requiring high geodetic accuracy.
3. Attribute discussion
(RANK) Is the item that defines the unique road classification.
RANK
1 - Primary Road
2 - 2nd Order Road
3 - 3rd Order Road
6 - 4th Order Road
FREQUENCY RANK
6 1
28 2
29 3
16 4
PRIMARY ROADS CODE
Lere-Guibi Rd 1 151101
Lere-Bedaoyo Rd 1 151102
Maikoro-Mando R 1 151103
Ndja-ElGeneina 1 151104
Njda-Maro Rd 1 151105
Guelendeng-Gore 1 151106
SECONDARY ROADS CODE
Nokou-Massgt Rd 2 152201
Mouz-Mouss Rd 2 152202
Mondo-Bol Rd 2 152203
Abougou-Ngoura 2 152204
Ndja-Bousso Rd 2 152205
Masseny-AmTiman 2 155206
Mongo-Ati Rd 2 155207
Bokoro-Massalef 2 155208
Bitkine-Melfi R 2 152209
Mongo-Mangalme 2 152210
AmTiman-Kyabe R 2 152211
Melfi-Chari Rd 2 152212
Damtar-Dik Rd 2 152213
Sarh Spur 2 152214
Djebrene-Karo R 2 152215
Fianga-Pala Rd 2 152216
Sorga-Gounou Rd 2 152217
Tikem-Gore Rd 2 152218
Bakaba-Markound 2 152219
Maya-Kendere Rd 2 152220
Baipog-Gore Rd 2 152221
Bessao-Moundou 2 152222
Deli-Pala Rd 2 152223
Beinamar-Reb Rd 2 152224
Bere-Moundou Rd 2 152225
OumHadj-Saraf 2 152226
Biltine-Iriba 2 152227
Biltine-AmTiman 2 152228
TERTIARY ROADS CODE
Mouss-Salal Rd 3 153301
NGuigmi-Chad Rd 3 153302
Lima-Bol Jct Rd 3 153303
Bol Jct-Mao Rd 3 153304
AzouBardaiJct Rd 3 153305
Lib-Jct Road 3 153306
Wour spur 3 153307
Jct - Faya Rd 3 153308
Faya Bypasses 3 153309
Faya-Salal Rd 3 153310
Fada-Biltine Rd 3 153311
Iriba-Tine Rd 3 153312
Guereda-Adre Rd 3 153313
Adre-Goz Beida 3 153314
AmDam-GozBeida 3 153315
AmTiman-Kyabe 3 153316
AmTiman-Haraze 3 153317
Melfi-Kendegue 3 153318
AbouDeia-Zakoum 3 153319
Sahr-KemataI Rd 3 153320
Ati-Djedaa Rd 3 153321
OumHadj-HarDjom 3 153322
Karal-Djemeya R 3 153323
Kotoa-Bongor Rd 3 153324
Ogo-Guelendeng 3 153325
Manga-Gayam Rd 3 153326
Fianga-Molfdy R 3 153327
Bambara-Moutogo 3 153328
Abeche-AmZoer R 3 153329
4TH ORDER ROADS CODE
HarDjomb-Djed 4 154401
Fada-Iriba Rd 4 154402
OumChalouba Rd 4 154403
Fada-Faya Rd 4 154404
Kossama Spur 4 154405
Ntiona Rd 4 154406
Ziguey Rd 4 154407
Lioua-Nokou Rd 4 154408
Nokou-Kalia Rd 4 154409
Mao-Nguigmi Rd 4 154410
RigRig-Ouagam R4 154411
Mao-Karme Rd 4 154412
Mondo-BahrGhaz 4 154413
Mouss-AmDjam Rd 4 154414
Haraz-Todji Rd 4 154415
BahrGhaz-Mao Rd 4 154416
4. Procedures used to create or automate data
This map file defines the roadways within Chad and was generated from
four Atlas Graphics .bna ASCII files, CHxSTYRD.BNA, into ARC/INFO .gen
format via a utility called CONVERT. The ARC/INFO BUILD was then used
on the coverages to create arc-node topology (and an arc attribute
table .AAT). Road names were added to the .AAT files from .nam files
(created by the CONVERT utility) via the ARC/INFO ADD and JOINITEM
commands. The four resulting coverages were then APPENDed into CDROAD
to complete the process.
5. References cited
I'Institut Geographique National (IGB)/Brazzaville, 1974, Republique
du Tchad, Carte Routiere.
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Last Modified 5 February 1996.