Identification_Information:

Citation:

Citation_Information:

Originator: Dr. Thomas Ahlbrandt

Publication_Date: 199708

Publication_Time:

Title:

Map showing Geology, Oil and Gas Fields and Geological Provinces

of Africa

Edition:

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name: World Energy Data on CD-ROM - Open File Report 97-470A

Issue_Identification: Africa

Publication_Information:

Publication_Place: Denver, Colorado

Publisher: U.S. Geological Survey

Other_Citation_Details:

Online_Linkage:

Larger_Work_Citation:

Citation_Information:

Description:

Purpose:

The Data provide Government, geological community, consultants,

and public with information on important geological basis used

to define provinces and oil and gas fields for U.S.G.S. Oil and

Gas assessement of the World.

Abstract:

Map showing Geology, Oil and Gas fields and Geologic Provinces

of Africa is GIS data set designed originally in ESRI's ARC/INFO

ver. 7.0.4 system.

--------------------

There are several data sets subdivided into directories:

1. COVER

Contains original UNIX ARC/INFO (ver. 7.0.4) coverages

in (Robinson projection:

1.1 geo2_7 - Surficial geology. Item "glg" in Feature Attribute

Table.

1.2 prov2_7 - Geological Provinces that outline areas with

common geological structures and petroleum systems.

There are two additional items in FAT:

"code" - Geologic Province code and

"name" - Geologic Province name.

1.3 fld2_7 - Centerpoints of Oil and Gas fields.

1.4 pol2_7 - Country boundaries.

1.5 llf2_7 - Latitude/Longitude grid with cell size 4 * 6 degree.

1.6 reg_2_7 - Boundary between region 2 (Middle East/North Africa

and 7 (Sub Saharan Africa).

These regions are two of the eight regional

subdivisions in the U.S.G.S. Oil and Gas assessment

of the World.

1.7 anno2_7 - annotations for Ocean names.

1.8 shore2_7 - shore line for Africa and surrounding areas

*****************************

2. EXPRT_UX EXPRT_PC

Contains several subsets in export and ungenerate formats:

2.1 ARC/INFO EXPORT data set (Robinson projection) consists of eight

files in ARC/INFO INTERCHANGE format

(*.e00 files without compression).

File names are correspondent to the original coverages names

(see section 1)

2.2 ARC/INFO UNGENERATE files (ASCII comma delimeted) for four major

coverages (*.gen extention).

File names are correspondent to the original coverage names.

2.3 Attribute files (*.csv extention).

Contains ASCII, comma delimeted files for the five Feature Attribute

tables of the ARC/INFO coverages.

*****************************

3. PLOT

Contains two subsets of data:

3.1 afr_map - complete Map Composition for use in ARC/INFO ARCPLOT

(collection of *.gra files).

3.2 prov2_7 - complete Map Composition for data without geology.

3.3 afr.hp2 - plot file for all the data in HPGL2 format.

3.4 provs.hp2 -plot file for data without geology in HPGL2 format.

*****************************

4. TEXT_MAC TEXT_PC TEXT_UX

(see below under "Supplemental Information")

*****************************

5. VIEWS

ARCVIEW (ver 3.0) data set consists of 24 files. The main is project file

- afr_all.apr.

There are 5 shape-files corresponding to 5 major ARCINFO coverages:

geo2_7, fld2_7, prov2_7, llf2_7, pol2_7.

Every shape file is supplemented by the two standard ARCVIEW files

*.shx and *.dbf.

There are two legend files for geology theme:

afr_geol.avl - index names for geologic age

afr_age.avl - geologic names without index

*****************************

The ARC/INFO coverages are supplemented by several files (total 30)

in ARC/INFO INTERCHANGE format (where it was available). These files

allow user to produce complete Map Composition of data at a scale

1:12,500,000 by using ARCPLOT subsystem.

1. adob_aml - AML file to produce complete Map Composition

at a scale 1:12,500,000 by using ARCPLOT subsystem

and to plot Map Composition automatically on

HP650C plotter

Supplemental_Information:

The 23 files are provided as supplementary for plotting final Map

Composition in ARCPLOT.

They are also in ARC/INFO INTERCHANGE format (extention .E00):

1. plot_aml - AML file to produce complete Map Composition

at a scale 1:12,500,000 and to plot Map

Composition automatically on HP650C plotter.

To use this file the user must set actual full path

name to the data or copy all the files to single

directory (by Feliks Persits).

2. usgs_lab - U.S.G.S. headline text

3. source - List of all the sources of the data

4. authors - Who participated in Data Set creation.

5. pol_txt - Text indicating political boundaries are for reference and

are not definitive in any manner.

6. geo_rob - Command file for PROJECT

(Geographic to Robinson).

7. tr_rob - Command file for PROJECT

(Transverse Mercator to Robinson).

8. index - Text for small index map showing Provinces and

boundary between regions 2 and 7.

9. prov_key - Key-legend file for Province outlines

10. pol_key - Key-legend file for International boundaries

11. map_key - Base key file for map legend

12. oil_key - Key-legend file for Oil/Gas fields centerpoints

13. afr_shd - Shadeset file

14. mapbar - AML for drawing scale and scalebar

(by B. Beeman)

15. afr_aml - AML for ARCEDIT

16. pr_draw - AML for Map Composition without geology.

17. afr_menu - Menu file for geological attributing.

18. lut_txt - Text file for look-up table that keeps symbols

for every "glg" value.

19. afr_lut - INFO Look-up table for POLYGONSHADE of "glg" item.

20. block_r - Text for Projection description

21. fnt034 - Pattern for afr_shd shadeset

22. of_name - Open File report Number

23. ds_claim - Text for disclaimer

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 199708

Time_of_Day:

Multiple_Dates/Times:

Calendar_Date:

Time_of_Day:

Range_of_Dates/Times:

Beginning_Date:

Beginning_Time:

Ending_Date:

Ending_Time:

Currentness_Reference:

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -17.4

East_Bounding_Coordinate: 63.36

North_Bounding_Coordinate: 38.3

South_Bounding_Coordinate: -37.1

Data_Set_G-Polygon:

Data_Set_G-Polygon_Outer_G-Ring:

G-Ring_Latitude:

G-Ring_Longitude:

Data_Set_G-Polygon_Exclusion_G-Ring:

G-Ring_Latitude:

G-Ring_Longitude:

Keywords:

Theme:

Theme_Keyword_Thesaurus:

Theme_Keyword: Oil

Theme_Keyword: Gas

Theme_Keyword: Geology

Theme_Keyword: Africa

Theme_Keyword: Province

Place:

Place_Keyword_Thesaurus:

Place_Keyword: Africa

Stratum:

Stratum_Keyword_Thesaurus:

Stratum_Keyword: Geologic

Temporal:

Temporal_Keyword_Thesaurus:

Temporal_Keyword:

Access_Constraints: None

Use_Constraints: None

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Dr. Thomas Ahlbrandt

Contact_Organization: U.S. Geological Survey, Central Region, Denver

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Central Region, Denver

Contact_Person: Dr. Thomas Ahlbrandt

Contact_Position: Project Chief

Contact_Address:

Address_Type: mailing and physical address

Address:

U.S. Geological Survey

Energy Resource Team

Denver Federal Center, MS 939

City: Denver

State_or_Province: Colorado

Postal_Code: 80225

Country: USA

Contact_Voice_Telephone: 303-236-5776

Contact_TDD/TTY_Telephone:

Contact_Facsimile_Telephone: 303-236-8822

Contact_Electronic_Mail_Address: ahlbrandt@usgs.gov

Hours_of_Service: 9 a.m - 5 p.m. local time U.S. Rocky Mountain Time Zone

Contact_Instructions:

Browse_Graphic:

Browse_Graphic_File_Name:

Browse_Graphic_File_Description:

Browse_Graphic_File_Type:

Data_Set_Credit:

Digital Map Compilation - Feliks Persits

Geological Attribution - Feliks Persits, Thomas Ahlbrandt, Michelle

Tuttle, Ronald Charpentier, Michael Brownfield

Province Boundaries - Region 2 - Thomas Ahlbrandt,

Region 7 - Michelle Tuttle

Province Boundaries Digital Compilation - Lee Osmonson

Oil and Gas Database - Tim Klett

Security_Information:

Security_Classification_System: None

Security_Classification:

Security_Handling_Description:

Native_Data_Set_Environment:

Hardware: Sun Sparc Server 1000 with Solaris 2.5.1

GIS software: Workstation ARC/INFO ver. 7.0.4

Set of subdirectories of 382 MB total size

Cross_Reference:

Citation_Information:

Originator:

COMMISSION FOR THE GEOLOGICAL MAP OF THE WORLD (CGMW)

INTERNATIONAL GEOLOGICAL MAPPING BUREAU (BRGM)

UNESCO

Publication_Date:

BeginningDate 1987

EndingDate 1990

Publication_Time:

Title: INTERNATIONAL GEOLOGICAL MAP OF AFRICA

Edition:

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name:

Issue_Identification:

Publication_Information:

Publication_Place: Paris, France

Publisher:

Published by CGMW and UNESCO with the financial

support of BRGM

Other_Citation_Details:

Online_Linkage:

Larger_Work_Citation:

Citation_Information:

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Overall accuracy based on accuracy of general geology coverage.

The scanned images of each of five sheets of original paper map

(from UNESCO base geologic map) were transformed to Transverse

Mercator projection with RMS error not more than 2500 m (0.5 mm

in original paper map). No rubber transformation applied.

Gray-scale images were used as a background in ARCEDIT digitizing.

Maximum shift a line in a coverage from centerline of its copy

on image did not exceed 1500-1700 m.

Final plot of 1:5,000,000 scale was superimposed on a top of

original map, maximum error did not exceed 3500 m.

Quantitative_Attribute_Accuracy_Assessment:

Attribute_Accuracy_Value:

Standard ARC/INFO attributes accuracy in Feature Attributes

Tables like AREA, PERIMETER, etc. depend on horizontal positional

Accuracy (Section 2.4.1.1).

All the additional attributes are character type.

Attribute_Accuracy_Explanation:

All the Attributes besides standard ARC/INFO are character type.

Standard verification of attributes reliability has been done by

ARC/INFO EDITPLOT program to find out polygons without assigned

character value or with more than one value.

Logical_Consistency_Report:

Since Data set is collection of ARC/INFO coverages topological

consistency are supported. Fuzzy tolerance has been maintained

the same through all processing steps. Based on fuzzy tolerance

value all undershoots and overshoots were detected and deleted.

A comparison between color plot and original paper map was

carried out by visual comparison. Color plots in 1:5,000,000 scale

were superimposed on every of correspondent original map sheets.

All detected errors in attributes were corrected.

Completeness_Report:

The generalizations of original geological map (UNESCO) were

carried out:

1. Several geological age subdivisions on original (UNESCO)

1:5,000,000 geological map were combined into single units.

For example, all Cretaceous combined into one unit.

2. All the Precambrian subdivisions were combined into one

unit.

This version of Geologic Province Boundaries are correct as of July, 1997.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

1. Original geological maps are of 500 m. maximum accuracy

(0.1 mm on paper map of 1:5,000,000 scale)

2. Scanned images were of 200 dot/inch resolution

(0.12 mm on paper). That is why fuzzy tolerance for CLEAN

programm in ARC/INFO was set to 500 m.

Average positional accuracy can be evaluated as 1000 m (twice

of fuzzy tolerance).

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 1000 m.

Horizontal_Positional_Accuracy_Explanation:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: N/A

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value:

Vertical_Positional_Accuracy_Explanation:

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: CGMW and UNESCO

Publication_Date: 1990

Publication_Time:

Title: International Geologic Map of Africa

Edition: 1987-1990

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name:

Issue_Identification:

Publication_Information:

Publication_Place: Paris,France

Publisher: CGMW and UNESCO

Other_Citation_Details:

Online_Linkage:

Larger_Work_Citation:

Source_Scale_Denominator: 5,000,000

Type_of_Source_Media: Paper

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1987

Beginning_Time:

Ending_Date: 1990

Ending_Time:

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Paper Geologic Map

Source_Contribution:

All the five paper map sheets are used as the sources

for creation the correspondent ARC/INFO coverages.

Source_Citation:

Citation_Information:

Originator: U.S.G.S., Central Region

Publication_Date: unpublished material

Publication_Time:

Title: Binary and gray-scale images

Edition:

Geospatial_Data_Presentation_Form: map

Other_Citation_Details: Intermediate data

Source_Scale_Denominator: 5,000,000

Type_of_Source_Media: online

Source_Time_Period_of_Content:

Source_Citation_Abbreviation: Scanned images

Source_Contribution: Used as a background for digitizing in ARCEDIT.

Process_Step:

Process_Description: Paper geological map digitizing.

Source_Used_Citation_Abbreviation: Paper Geologic Map

Process_Date: 1996

Process_Time:

Source_Produced_Citation_Abbreviation:

Transparent mylar copy,

Binary and gray-scale images

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person:

Contact_Organization: U.S.G.S., Central Region, Denver

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Central Region

Contact_Person: Feliks Persits

Contact_Position: U.S.G.S. contractor

Contact_Address:

Address_Type: mailing and physical address

Address:

U.S. Geological Survey

Energy Resource Program

Denver Federal Center, MS 939

City: Denver

State_or_Province: Colorado

Postal_Code: 80225

Country: USA

Contact_Voice_Telephone: 303-236-4608

Contact_TDD/TTY_Telephone:

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: fpersits@usgs.gov

Hours_of_Service: 9 a.m. - 5 p.m. local time U.S. Rocky Mountain Time Zone

Contact_Instructions:

Process_Description:

Scanning mylars and original paper maps on large

format Anatech Eagle scanner. There were two copies of

every map sheet - binary (after mylar scanning)

and gray-scale (after original map scanning).

Both image copies were in TIFF format at 200 dot/inch

resolution.

Source_Used_Citation_Abbreviation: Paper geological maps

Source_Used_Citation_Abbreviation: Mylars

Process_Date: 1997

Process_Time:

Source_Produced_Citation_Abbreviation:

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S.G.S., Central Region, World Energy Resource Team

Publication_Date: Unpublished material

Publication_Time: unknown

Title: Mylar

Edition:

Geospatial_Data_Presentation_Form:

Series_Information:

Series_Name:

Issue_Identification:

Publication_Information:

Publication_Place: unpublished material

Publisher:

Other_Citation_Details: Intermediate data

Source_Scale_Denominator: 5,000,000

Type_of_Source_Media: Stable-base material

Source_Time_Period_of_Content:

Source_Citation_Abbreviation: Mylar

Source_Contribution:

Mylar used to extract geological boundaries from original

paper map and produce binary scanned image.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Petroconsultants International Data Corp.

Publication_Date: 1996

Publication_Time: unknown

Title: PetroWorld Database

Edition: 1996

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name:

Issue_Identification:

Publication_Information:

Publication_Place: Geneva, Switzerland

Publisher: Petroconsultants International Data Corp.

Other_Citation_Details:

All data in Petroworld Database use Latitude and

Longitude coordinates in Decimal Degrees.

Source_Scale_Denominator:

Type_of_Source_Media: CD-ROM

Source_Time_Period_of_Content:

Source_Citation_Abbreviation: Centerpoints of Oil and Gas Fields

Source_Contribution:

Centerpoints of Oil and Gas Fields were reprojected

to Robinson Projection and used as the layer on

final ARC/INFO Map Composition.

Source_Information:

Source_Citation:

Citation_Information:

Originator: ESRI

Publication_Date: unknown

Publication_Time: unknown

Title: ArcWorld 1:3 million geographical data set.

Edition:

Geospatial_Data_Presentation_Form:

Series_Information:

Series_Name:

Issue_Identification:

Publication_Information:

Publication_Place: Redlands, CA, USA

Publisher: ESRI

Other_Citation_Details:

There are many informational layers in this data set.

Coordinates are Latitude and Longitude in Decimal

Degrees.

Source_Scale_Denominator: 3000000

Type_of_Source_Media: CD-ROM

Source_Time_Period_of_Content:

Source_Citation_Abbreviation: Country boundaries

Source_Contribution:

The external source for country boundaries

in ARC/INFO final Map Composition.

Cloud_Cover: Unknown

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

Direct_Spatial_Reference_Method: Point and Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point and Area point

Point_and_Vector_Object_Count:

VPF_Terms_Description:

VPF_Topology_Level: 3

VPF_Point_and_Vector_Object_Type: Node

Point_and_Vector_Object_Count:

Raster_Object_Information:

Raster_Object_Type:

Row_Count:

Column_Count:

Vertical_Count:

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.006

Longitude_Resolution: 0.006

Geographic_Coordinate_Units: Decimal Degrees

Planar:

Map_Projection:

Map_Projection_Name: Robinson

Robinson:

Longitude_of_Projection_Center: 0

False_Easting: 0

False_Northing: 0

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.945

Longitude_of_Central_Meridian: 16.0

Latitude_of_Projection_Origin: 0

False_Easting: 0.

False_Northing: 0.

Other_Projection's_Definition:

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 1

Ordinate_Resolution: 1

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name:

Ellipsoid_Name: Sphere

Semi-major_Axis: 6370997

Denominator_of_Flattening_Ratio: 1.0

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name:

Altitudes and Depths have not been used for

Project.

Altitude_Resolution:

Altitude_Distance_Units:

Altitude_Encoding_Method:

Depth_System_Definition:

Depth_Datum_Name:

Depth_Resolution:

Depth_Distance_Units:

Depth_Encoding_Method:

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Surficial geology

Entity_Type_Definition:

ARC/INFO coverage named /cover/geo2_7

and correspondent ARCVIEW shape file /views/geo2_7.shp

Entity_Type_Definition_Source: U.S.G.S.

Attribute:

Attribute_Label: glg

Attribute_Definition:

ARC/INFO Feature Attribute Table Item

ARCVIEW DBF table item

Attribute_Definition_Source: U.S.G.S.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value:

Q, Qe, Qp, QT, T, Mz, TK, K, Kl, KJ, J, Jl, JTr,

Tr, Trl, Pz, MzPz, P, TrP, KC, PC, JC, C, CD, Du,

D, DS, S, SO, O, OCm, Cm, pC, PzpC,

Qv, Ti, Mi, MiPi, Pi, Kimb, Salt Dome,

Unmapped area, Open water, Sea

Enumerated_Domain_Value_Definition:

Range of geologic age values

taken from original map

legend.

Enumerated_Domain_Value_Definition_Source: U.S.G.S.

Attribute_Units_of_Measure: Range of character values

Attribute_Measurement_Resolution:

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy:

Attribute_Value_Accuracy_Explanation: Accuracy can not be provided as a real value.

Attribute_Measurement_Frequency:

Overview_Description:

Entity_and_Attribute_Overview:

Each polygon in "geo2_7" coverage and in "geo2_7"

shape file (ARCVIEW) are assigned with "glg" value.

These values can be used with Look-up table

/text/afr_lut in ARC/INFO or with legend file (.avl

in ARCVIEW to plot colored geological map.

Entity_and_Attribute_Detail_Citation:

ARC/INFO coverage was created by assinging "glg" (geology)

value to every polygon in accordance to original geologic

map content.

Detailed_Description:

Entity_Type:

Entity_Type_Label: Geologic Province outlines

Entity_Type_Definition:

ARC/INFO coverage named /cover/prov2_7

and correspondent ARCVIEW shape file /views/prov2_7

Entity_Type_Definition_Source: U.S.G.S.

Attribute:

Attribute_Label: code

Attribute_Definition:

ARC/INFO Feature Attribute Table Item

ARCVIEW DBF table item

Attribute_Definition_Source: U.S.G.S.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 7000

Range_Domain_Maximum: 7999

Attribute_Units_of_Measure: numbers

Attribute_Measurement_Resolution: 1

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy:

Attribute_Value_Accuracy_Explanation:

These code number serve as unique Geologic

Province Code

Attribute_Measurement_Frequency:

Overview_Description:

Entity_and_Attribute_Overview:

Each polygon in "prov2_7" coverage and in "prov2_7.shp"

shape file (ARCVIEW) are assigned with "Code" value"

and "Name" values. These values were used as unique

Number and Name for every Geological Province.

Entity_and_Attribute_Detail_Citation:

ARC/INFO coverage was created by assigning "code" (Number)

and "name" (Name) values to every polygon as the U.S.G.S.

unique subdivisions of petroleum geology for African continent.

Detailed_Description:

Entity_Type:

Entity_Type_Label: Centerpoints of Oil and Gas fields

Entity_Type_Definition:

ARC/INFO coverage named /cover/fld2_7

and correspondent ARCVIEW shape file /views/fld2_7

Entity_Type_Definition_Source: Petroconsultants International Data Corp.

Attribute:

Attribute_Label: Longitude

Attribute_Definition:

ARC/INFO Feature Attribute Table Item

ARCVIEW DBF table item

Attribute_Definition_Source: Petroconsultants International Data Corp.

Attribute_Domain_Values:

Attribute_Units_of_Measure: Decimal Degrees

Attribute_Measurement_Resolution: 0.001

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Measurement_Frequency:

Attribute:

Attribute_Label: Latitude

Attribute_Definition:

ARC/INFO Feature Attribute Table Item

ARCVIEW DBF table item

Attribute_Definition_Source: Petroconsultants International Data Corp.

Attribute_Domain_Values:

Attribute_Units_of_Measure: Decimal Degrees

Attribute_Measurement_Resolution: 0.001

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Measurement_Frequency:

Attribute:

Attribute_Label: Fie_id

Attribute_Definition:

ARC/INFO Feature Attribute Table Item stands

for Oil and(or) Gas field ID.

Attribute_Definition_Source: Petroconsultants International Data Corp.

Attribute_Domain_Values:

Attribute_Units_of_Measure:

Attribute_Measurement_Resolution:

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Measurement_Frequency: Unknown

Attribute:

Attribute_Label: Prov_code

Attribute_Definition:

ARC/INFO Feature Attribute Table Item

ARCVIEW DBF table item

Attribute_Definition_Source: Petroconsultants International Data Corp.

Attribute_Domain_Values:

Attribute_Units_of_Measure: Integer value

Attribute_Measurement_Resolution: 1

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Measurement_Frequency: unknown

Overview_Description:

Entity_and_Attribute_Overview:

This ARC/INFO coverage and ARCVIEW shape file

have been provided with four additional items in

Feature Attribute Table (and been copied to

ARCVIEW DBF table):

1 and 2. Two coordinate Items with Latitude and Longitude

of Centerpoints of Oil and Gas Filds in Decimal Degrees.

3. Fie_id - Petroconsultants' Oil and Gas field ID.

4. Prov_code - Petroconsultants' Province Code.

Entity_and_Attribute_Detail_Citation: Came with PetroWorld Database

Overview_Description:

Entity_and_Attribute_Overview:

ARC/INFO coverage named /cover/pol2_7 and ARCVIEW shape file

/views/pol2_7 created from ESRI's ArcWorld 1:3 million Map.

This is a line coverage with many Items in Arc Attribute Tables.

These Items are of minor importance for this Project.

Entity_and_Attribute_Detail_Citation: This is ESRI's ArcWorld 1:3 million ARC/INFO coverage.

Detailed_Description:

Entity_Type:

Entity_Type_Label:

Project File named "afr_all.apr"

(separate directory VIEWS)

Entity_Type_Definition: ARCVIEW Project File named /views/afr_all.apr

Entity_Type_Definition_Source: U.S.G.S.

Attribute:

Attribute_Label:

Shape file /views/geo2_7.shp" that substitutes

ARCINFO coverage /cover/geo2_7 in ARCVIEW

environment

Attribute_Definition: ARCVIEW shape file

Attribute_Definition_Source: U.S.G.S.

Attribute_Domain_Values:

Attribute_Units_of_Measure:

Geographic and Attribute Data in shape file

are the same as for correspondent ARCINFO

coverage /cover/geo2_7

Attribute_Measurement_Resolution:

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Measurement_Frequency:

Attribute:

Attribute_Label:

Shape file /views/prov2_7 that replaces

ARCINFO coverage /cover/prov2_7 in ARCVIEW

environment

Attribute_Definition: ARCVIEW shape file

Attribute_Definition_Source: U.S.G.S.

Attribute_Domain_Values:

Attribute_Units_of_Measure:

Geographic and Attribute Data in shape file

are the same as for correspondent ARCINFO

coverage "provs"

Attribute_Measurement_Resolution:

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Measurement_Frequency:

Attribute:

Attribute_Label:

Shape file /views/fld2_7 that substitutes

ARCINFO coverage /cover/fld2_7 in ARCVIEW

environment

Attribute_Definition: ARCVIEW shape file

Attribute_Definition_Source: U.S.G.S.

Attribute_Domain_Values:

Attribute_Units_of_Measure:

Geographic and Attribute Data in shape file

are the same as for correspondent ARCINFO

coverage "provs"

Attribute_Measurement_Resolution:

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Measurement_Frequency: Unknown

Attribute:

Attribute_Label:

Shape file /views/llf2_7 that replaces

ARCINFO coverage /cover/llf2_7 in ARCVIEW

environment

Attribute_Definition: ARCVIEW shape file

Attribute_Definition_Source: U.S.G.S.

Attribute_Domain_Values:

Attribute_Units_of_Measure:

Geographic and Attribute Data in shape file

are the same as for correspondent ARCINFO

coverage /cover/llf2_7

Attribute_Measurement_Resolution:

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Measurement_Frequency: unknown

Attribute:

Attribute_Label:

Shape file /views/pol2_7 that replaces

ARCINFO coverage /cover/pol2_7 in ARCVIEW

environment

Attribute_Definition: ARCVIEW shape file

Attribute_Definition_Source: U.S.G.S.

Attribute_Domain_Values:

Attribute_Units_of_Measure:

Geographic and Attribute Data in shape file

are the same as for correspondent ARCINFO

coverage /cover/pol2_7

Attribute_Measurement_Resolution:

Beginning_Date_of_Attribute_Values:

Ending_Date_of_Attribute_Values:

Attribute_Value_Accuracy_Information:

Attribute_Measurement_Frequency: unknown

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person:

Contact_Organization:

Contact_Organization_Primary:

Contact_Organization:

U.S.G.S. Earth Science Information Center

(ESIC), Denver, CO

Contact_Person:

Contact_Position:

Contact_Address:

Address_Type: mailing and physical address

Address:

U.S. Geological Survey

Box 25286, Building 810

Denver Federal Center

City: Denver

State_or_Province: Colorado

Postal_Code: 80225

Country: USA

Contact_Voice_Telephone: 303-202-4200

Contact_TDD/TTY_Telephone:

Contact_Facsimile_Telephone: 303-202-4188

Contact_Electronic_Mail_Address: infoservices@usgs.gov

Hours_of_Service:

Contact_Instructions:

Resource_Description:

CD-ROM "MAP SHOWING GEOLOGY, OIL AND GAS FIELDS AND

GEOLOGICAL PROVINCES OF AFRICA".

Distribution_Liability:

Although these data have been processed on computer

system at the U.S. Geological Survey, U.S. Department

of the Interior, no warranty expressed or implied is

made by the Geological Survey regarding the utility

of the data on any other system, nor shall the act of

distribution constitute any such warranty.

Standard_Order_Process:

Non-digital_Form:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ARCE

Format_Version_Number: 7.0.4

Format_Version_Date:

Format_Specification:

Format_Information_Content:

File_Decompression_Technique: ARC/INFO IMPORT OR GENERATE

Transfer_Size:

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

Dialup_Instructions:

Lowest_BPS:

Highest_BPS:

Number_DataBits:

Number_StopBits:

Parity:

Compression_Support:

Dialup_Telephone:

Dialup_File_Name:

Access_Instructions:

Online_Computer_and_Operating_System:

Offline_Option:

Offline_Media: CD-ROM

Recording_Capacity:

Recording_Density:

Recording_Density_Units:

Recording_Format:

Compatibility_Information:

Fees:

Ordering_Instructions:

To order CD-ROM you need to contact USGS Earth Science

Information Center (ESIC) by mail or call 1-800-USA-MAPS.

Turnaround:

Custom_Order_Process:

Technical_Prerequisites:

To use coverage data you need to have ARC/INFO ver. 7.0.4

or higher installed. To use ARCVIEW data you need to have

ARCVIEW 3.0 installed. If you dont't have ARC/INFO

other similar data set is available in Adobe Systems,

Inc., Portable Document Format(TM) (PDF). (You must

download and install the Adobe(R) Reader, available at

no charge from Adobe Systems, to view and print this

version.)

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:

Time_of_Day:

Multiple_Dates/Times:

Calendar_Date:

Time_of_Day:

Range_of_Dates/Times:

Beginning_Date:

Beginning_Time:

Ending_Date:

Ending_Time:

Metadata_Reference_Information:

Metadata_Date: 19970813

Metadata_Review_Date: 19970808

Metadata_Future_Review_Date:

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Feliks Persits

Contact_Organization: U.S.G.S. Central Region

Contact_Organization_Primary:

Contact_Organization:

U.S.G.S. node of the National Geospatial Data

Clearinghouse, component of the National Spatial

Data Infrastructure (NSDI).

Contact_Person:

Contact_Position:

Contact_Address:

Address_Type:

Address:

U.S. Geological Survey

Energy Resource Team

Denver federal Center, MS 939

City: Denver

State_or_Province: Colorado

Postal_Code: 80225

Country: USA

Contact_Voice_Telephone: 303-236-4608

Contact_TDD/TTY_Telephone:

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: http://nsdi.usgs.gov/nsdi

Hours_of_Service:

Contact_Instructions: Use NSDI home page

Metadata_Standard_Name: FGDC Content Standarts for Digital Geospatial Metadata

Metadata_Standard_Version: 199408

Metadata_Time_Convention:

Metadata_Access_Constraints:

Metadata_Use_Constraints:

Metadata_Security_Information:

Metadata_Security_Classification_System:

Metadata_Security_Classification:

Metadata_Security_Handling_Description: