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Surface Geology
Geo2_7t - ArcInfo coverage (Mercator projection),
Geo2_7g - ArcInfo coverage (Geographic coordinates),
geo2_7.shp - ArcView shape file
back to main metadata file
Metadata:
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Identification_Information:
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Citation:
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Citation_Information:
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Originator: U.S. Geological Survey
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Publication_Date: 200206
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Publication_Time: Unknown
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Title: Map showing Geology, Oil and Gas Fields, and
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Geologic Provinces
of Africa, version 2.0
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Edition: 2
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Geospatial_Data_Presentation_Form: vector digital data
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Online_Linkage: <http://energy.cr.usgs.gov>
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Description:
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Abstract:
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geo2_7 - Surficial geology. ArcInfo polygon coverage. Item "glg" in Feature
Attribute Table (FAT) is for geologic age.
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Purpose:
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The Data provide Government, geological community, consultants, and public
with information on geologic basis of African
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continent. It intented to use as a reference spatial data.
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Time_Period_of_Content:
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Time_Period_Information:
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Single_Date/Time:
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Calendar_Date: 2002
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Currentness_Reference: publication date
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Status:
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Progress: Complete
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Maintenance_and_Update_Frequency: None planned
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Spatial_Domain:
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Bounding_Coordinates:
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West_Bounding_Coordinate: -22.413353
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East_Bounding_Coordinate: 64.540365
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North_Bounding_Coordinate: 40.003867
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South_Bounding_Coordinate: -38.574876
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Keywords:
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Theme:
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Theme_Keyword_Thesaurus: None
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Theme_Keyword: Surface geology
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Place:
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Place_Keyword: Africa
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Access_Constraints: None
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Use_Constraints: None
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Point_of_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Feliks Persits
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Contact_Organization: U.S. Geological Survey, Central Region
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Contact_Position: U.S.G.S. contractor
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Contact_Address:
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Address_Type: mailing and physical address
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Address:
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U.S. Geological Survey Energy Resource Team, Box 25046, Denver Federal
Center, MS 939
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City: Denver
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State_or_Province: CO
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Postal_Code: 80225-0046
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Country: USA
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Contact_Voice_Telephone: 303-236-3612
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Contact_Facsimile_Telephone: 303-236-8822
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Contact_Electronic_Mail_Address: fpersits@usgs.gov
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Hours_of_Service: 8:00 am - 4:00 pm MST
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Browse_Graphic:
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Browse_Graphic_File_Name: africa.pdf
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Browse_Graphic_File_Type: PDF
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Data_Set_Credit:
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Digital Map Compilation - Feliks Persits
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Geological Attribution - Feliks Persits, Thomas Ahlbrandt, Michelle Tuttle,
Ronald Charpentier, Michael Brownfield
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Security_Information:
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Security_Classification: Unclassified
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Native_Data_Set_Environment:
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Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog
8.1.1.649
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Data_Quality_Information:
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Attribute_Accuracy:
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Attribute_Accuracy_Report:
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Standard ARC/INFO attributes accuracy in Feature Attributes Tables like
AREA, PERIMETER, etc. depend on horizontal
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positional accuracy. All the additional attributes are character type.
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Quantitative_Attribute_Accuracy_Assessment:
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Attribute_Accuracy_Explanation:
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All the Attributes besides standard ARC/INFO are character type. Standard
verification of attributes reliability has been
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done by ARC/INFO EDITPLOT program to find out polygons without assigned
character value or with more than one value.
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Logical_Consistency_Report:
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Since Data set is the ARC/INFO coverage topological consistency are supported.
Fuzzy tolerance has been maintained the same through
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all processing steps. Based on fuzzy tolerance value all undershoots and
overshoots were detected and deleted.
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A comparison between color plot and original paper map was carried out
by visual comparison. Color plots in 1:5,000,000 scale were
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superimposed on every of correspondent original map sheets. All detected
errors in attributes were corrected.
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Completeness_Report:
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Several
geologic age subdivisions on the original (UNESCO) 1:5,000,000 geologic
map were combined into single unit.
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As of May, 2000 generalizations of the original geologic map (UNESCO)
were carried out:
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1. All the Cretaceous units were combined into one.
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2. All the Precambrian subdivisions were combined into one.
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Boundaries are correct as of July, 1997.
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Positional_Accuracy:
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Horizontal_Positional_Accuracy:
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Horizontal_Positional_Accuracy_Report:
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1. Original geological maps are of 500 m. maximum accuracy (0.1 mm on paper
map of 1:5,000,000 scale).
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2. Scanned images were of 200 dot/inch resolution (0.12 mm on paper). That
is why fuzzy tolerance for CLEAN program
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in ARC/INFO was set to 500 m. Average positional accuracy can be evaluated
as 1000 m (twice of fuzzy tolerance).
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Quantitative_Horizontal_Positional_Accuracy_Assessment:
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Horizontal_Positional_Accuracy_Value: 1000 m
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Lineage:
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Source_Information:
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Source_Citation:
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Citation_Information:
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Originator: Commission for the Geological Map of the World (CGMW)
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Publication_Date: 1990
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Title: Carte géologique internationale de l'Afrique
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Edition: 1987-1990
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Geospatial_Data_Presentation_Form: map
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Source_Scale_Denominator: 5000000
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Type_of_Source_Media: Paper Geologic Map
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Source_Time_Period_of_Content:
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Source_Currentness_Reference: publication date
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Source_Citation_Abbreviation: Paper Geologic Map
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Source_Contribution:
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All the five paper map sheets are used as the sources for creation the
correspondent ARC/INFO coverages.
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Process_Step:
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Process_Description:
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Transparent mylar film was used to extract geologic boundaries from paper
geologic maps.
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Process_Date: 1996
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Process_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Dr. Thomas Ahlbrandt
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Contact_Organization: U.S. Geological Survey
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Contact_Position: Project Chief
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Contact_Voice_Telephone: 303-236-5776
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Contact_Facsimile_Telephone: 303-236-8822
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Contact_Electronic_Mail_Address: ahlbrandt@usgs.gov
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Hours_of_Service: 8 - 5 MST
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Process_Step:
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Process_Description:
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Scanning mylars on large format Anatech Eagle scanner in binary mode. Vectorizing
binary images in UNIX
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ArcInfo 7.0.1 to produce ArcInfo coverages by GRIDLINE utility.
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Source_Used_Citation_Abbreviation: Mylar scanning
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Process_Date: 1996
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Source_Produced_Citation_Abbreviation: ArcInfo coverages from binary
images
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Process_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Ronald Charpentier
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Contact_Organization: US Geological Survey
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Contact_Position: Senior Geologist
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Contact_Voice_Telephone: 303-236-5766
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Contact_Facsimile_Telephone: 303-236-8822
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Contact_Electronic_Mail_Address: charpentier@usgs.gov
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Hours_of_Service: 8 - 5 MST
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Process_Step:
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Process_Description:
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Scanning original paper maps on a large format Anatech Eagle scanner in
gray-scale mode.
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Source_Used_Citation_Abbreviation: Paper maps
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Process_Date: 1997
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Source_Produced_Citation_Abbreviation: Gray-scale images
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Process_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Feliks Persits
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Contact_Organization: US Geological Survey
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Contact_Position: GIS Contractor
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Contact_Address:
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Address_Type: mailing and physical address
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Address: Denver Federal Center, P.O. Box 25046, MS 939
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City: Denver
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State_or_Province: CO
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Postal_Code: 80225
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Country: USA
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Contact_Voice_Telephone: 303-236-3612
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Contact_Facsimile_Telephone: 303-236-8822
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Contact_Electronic_Mail_Address: fpersits@usgs.gov
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Hours_of_Service: 8 - 5 MST
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Process_Step:
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Process_Description:
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Geologic age attributes were assigned to ArcInfo polygon coverage
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Source_Used_Citation_Abbreviation: ArcInfo coverages from binary
images
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Process_Date: 1996
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Source_Produced_Citation_Abbreviation: Attributed ArcInfo coverages
from binary images
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Process_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Ronald. Charpentier
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Contact_Organization: US Geologcal Survey
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Contact_Position: GIS Contractor
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Contact_Voice_Telephone: 303-236-3612
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Contact_Facsimile_Telephone: 303-236-8822
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Contact_Electronic_Mail_Address: fpersits@usgs.gov
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Hours_of_Service: 5 - 8 MST
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Process_Step:
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Process_Description:
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ArcInfo coverages from binary images were transformed to Transverse Mercator
projection with central meridian
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of 160 E and scale factor at a central meridian equal to 0.995.
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Source_Used_Citation_Abbreviation: Attribited ArcInfo coverages
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Process_Date: 1996
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Source_Produced_Citation_Abbreviation: Projected ArcInfo coverages
from binary images
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Process_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Feliks Persits
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Contact_Organization: US Geological Survey
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Contact_Position: GIS Contractor
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Contact_Voice_Telephone: 303-236-3612
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Contact_Facsimile_Telephone: 303-236-8822
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Contact_Electronic_Mail_Address: fpersits@usgs.gov
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Hours_of_Service: 5 - 8 MST
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Process_Step:
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Process_Description:
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Gray-scale images were georeferenced by ArcInfo REGISTER and RECTIFY utilities
by using projected
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ArcInfo coverages from binary images.
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Source_Used_Citation_Abbreviation: Gray-scale images
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Process_Date: 1997
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Source_Produced_Citation_Abbreviation: Georeferenced gray-scale
images
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Process_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Feliks Persits
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Contact_Organization: U.S. Geological Survey
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Contact_Position: GIS Contractor
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Contact_Voice_Telephone: 303-236-3612
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Contact_Facsimile_Telephone: 303-236-8822
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Contact_Electronic_Mail_Address: fpersits@usgs.gov
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Hours_of_Service: 5 - 8 MST
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Process_Step:
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Process_Description:
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Verification and correction of line work and geologic attributing of projected
ArcInfo coverages by using
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georeferenced gray-scale images as background images in ArcInfo ArcEdit
7.0.2
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Source_Used_Citation_Abbreviation: Projected ArcInfo coverages
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Process_Date: 1997
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Source_Produced_Citation_Abbreviation: Corrected ArcInfo coverages
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Process_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Feliks Persits
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Contact_Organization: U.S. Geological Survey
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Contact_Position: GIS Contractor
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Contact_Address:
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Address_Type: mailing and physical address
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Address: Denver Federal Center, P.O. Box 25046, MS 939
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City: Denver
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State_or_Province: CO
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Postal_Code: 80225
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Country: USA
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Contact_Voice_Telephone: 303-236-3612
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Contact_Facsimile_Telephone: 303-236-8822
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Contact_Electronic_Mail_Address: fpersits@usgs.gov
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Hours_of_Service: 8 - 5 MST
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Process_Step:
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Process_Description:
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Corrected ArcInfo coverages were projected to geographic coordinates and
to Mercator projection
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with a central meridian of 250 E by ArcInfo PROJECT utility.
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Source_Used_Citation_Abbreviation: Corrected ArcInfo coverages
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Process_Date: 1997
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Source_Produced_Citation_Abbreviation:
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Final ArcInfo coverages in Mercator projection and in geographic coordinates.
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Process_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Feliks Persits
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Contact_Organization: GIS Contractor
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Contact_Address:
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Address_Type: mailing and physical address
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Address: Denver Federal Center, P.O. Box 25046, MS 939
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City: Denver
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State_or_Province: CO
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Postal_Code: 80225
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Country: USA
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Contact_Voice_Telephone: 303-236-3612
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Contact_Facsimile_Telephone: 303-236-8822
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Contact_Electronic_Mail_Address: fpersits@usgs.gov
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Hours_of_Service: 5 - 8 MST
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Spatial_Data_Organization_Information:
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Direct_Spatial_Reference_Method: Vector
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Point_and_Vector_Object_Information:
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SDTS_Terms_Description:
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SDTS_Point_and_Vector_Object_Type: G-polygon
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Point_and_Vector_Object_Count: 11977
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Spatial_Reference_Information:
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Horizontal_Coordinate_System_Definition:
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Planar:
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Map_Projection:
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Map_Projection_Name: Mercator
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Mercator:
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Standard_Parallel: 0.00
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Longitude_of_Central_Meridian: 25.00
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False_Easting: 0.00
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False_Northing: 0.00
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Planar_Coordinate_Information:
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Planar_Coordinate_Encoding_Method: coordinate pair
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Coordinate_Representation:
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Abscissa_Resolution: 0.016384
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Ordinate_Resolution: 0.016384
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Planar_Distance_Units: meters
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Geodetic_Model:
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Horizontal_Datum_Name: D_WGS_1984
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Ellipsoid_Name: WGS_1984
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Semi-major_Axis: 6378137.000000
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Denominator_of_Flattening_Ratio: 298.257224
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Entity_and_Attribute_Information:
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Detailed_Description:
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Entity_Type:
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Entity_Type_Label: geo2_7t_polygon
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Attribute:
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Attribute_Label: OBJECTID
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Attribute:
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Attribute_Label: Shape
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Attribute_Definition: Feature geometry.
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Attribute_Definition_Source: ESRI
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Attribute_Domain_Values:
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Unrepresentable_Domain: Coordinates defining the features.
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Attribute:
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Attribute_Label: AREA
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Attribute_Definition: Area of polygon
Attribute_Definition_Source: Software computed
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 928710.10
Range_Domain_Maximum: 3067273961704.0
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Attribute:
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Attribute_Label: PERIMETER
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Attribute_Definition: Perimeter of polygon
Attribute_Definition_Source: Software computed
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4588.40
Range_Domain_Maximum: 169603590.891
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Attribute:
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Attribute_Label: GEO2_7T_
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Attribute_Definition: Internal ID
Attribute_Definition_Source: Software computed
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2
Range_Domain_Maximum: 11978
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Attribute:
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Attribute_Label: GEO2_7T_ID
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Attribute_Label: GEO2_ID
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Attribute_Definition: User ID
Attribute_Definition_Source: Software computed
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 11994
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Attribute:
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Attribute_Label: GLG
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Attribute_Definition: Surface Geology Attribute
Attribute_Definition_Source: U.S.Geological Survey
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Enumerated_Domain:
"Q" - Quaternary (undivided)
"Qe" - Holocene
"Qp" - Pleistocene
"QT" - Cenozoic
"T" - Tertiary
"Mz" - Mesozoic
"TK" - Tertiary-Cretaceous
"K" - Cretaceous
"Kl" - Lower Creteceous"
"KJ" - Cretaceous-Jurassic
"J" - Jurassic
"Jl" - Lower Jurassic
"JTr" - Jurassic-Triassic
"Tr" - Triassic
"Trl" - Lower Triassic
"MzPz" - Mesozoic-Paleozoic
"KC" - Cretaceous-Carboniferous
"JC" - Jurassic-Carboniferous
"Pz" - Paleozoic
"P" - Permian
"TrP" - Triassic-Permian
"PC" - Permian-Carboniferous
"C" - Carboniferous
"CD" - Carboniferos-Devonian
"D" - Devonian
"Du" - Upper/Middle Devonian
"DS" - Devonian-Silurian
"S" - Silurian
"SO" - Silurian-Ordovician
"OCm" - Ordovician-Camrian
"pCm" - Precambrian
"PzpC" - Paleozoic-Precambrian
"Qv" - Quaternary Igneous
"Ti" - Tertiary Igneous
"Mi" - Mesozoic Igneous
"MiPi" - Mz-Pz Igneous
"Pi" - Paleozoic Igneous
"Kimb" - Kimberlites
"S_d" - Salt Domes
"H2O" - Water (River 0r Lake)
"Sea" - Sea
"oth"S_d" - Areas outside of African Continent"
Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey.
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Attribute:
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Attribute_Label: Shape_Length
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Attribute_Definition: Length of feature in internal units.
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Attribute_Definition_Source: ESRI
-
Attribute_Domain_Values:
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Unrepresentable_Domain: Positive real numbers that are automatically
generated.
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Attribute:
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Attribute_Label: Shape_Area
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Attribute_Definition: Area of feature in internal units squared.
-
Attribute_Definition_Source: ESRI
-
Attribute_Domain_Values:
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Unrepresentable_Domain: Positive real numbers that are automatically
generated.
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Distribution_Information:
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Distributor:
-
Contact_Information:
-
Contact_Organization:
U.S. Geological Survey Earth Science Information Center (ESIC)
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Contact_Person_Primary:Dorothy Tanti
-
Contact_Address:
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Address_Type: mailing and physical address
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Address:
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U.S.Geological Survey Box 25046 Building 25 Denver Federal Center
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City: Denver
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State_or_Province: CO
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Postal_Code: 80225-0286
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Country: USA
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Contact_Voice_Telephone: 303.236.1647
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Contact_Electronic_Mail_Address: eteamdisks@usgs.gov
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Hours_of_Service: 8:00 am - 4:00 pm MST
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Standard_Order_Process:
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Digital_Form:
-
Digital_Transfer_Information:
-
Format_Name: ARCE
-
Format_Specification:
-
ArcInfo coverage
-
ArcView shape file
-
ARC/INFO Export format
-
ARC/INFO Generate format ASCII file, formatted for text attributes
-
SDTS Spatial Data Transfer Standard (Federal Information Processing Standard
173)
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Metadata_Reference_Information:
-
Metadata_Date: 20011019
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Metadata_Contact:
-
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: David A. Ferderer
Contact_Position: Data library manager, Central Energy Resources Team
Contact_Address:
Address_Type:mailing and physical address
Address: U.S. Geological Survey, MS 939 Box 25046 Denver Federal Center
City: .Denver
State_or_Province: CO.
Postal_Code: 80225-0046
Contact_Voice_Telephone: (303) 236-3611
Contact_Facsimile_Telephone: (303) 236-8822
Contact_Electronic_Mail_Address: dferdere@usgs.gov
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Hours_of_Service: 8 am. to 4 pm. MST
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Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial
Metadata
-
Metadata_Standard_Version: FGDC-STD-001-1998
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Metadata_Time_Convention: local time
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Metadata_Extensions:
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Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
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Profile_Name: ESRI Metadata Profile
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metadata file
Generated by mp
version 2.7.3 on Fri Oct 19 12:28:18 2001
Back to previous
U. S. Geological Surve Open File Report
97-470A, ver.2
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