Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 200206 Publication_Time: Unknown Title: Map showing Geology, Oil and Gas Fields, and Geologic Provinces of Africa, version 2.0 Edition: 2 Geospatial_Data_Presentation_Form: vector digital data Online_Linkage: Description: Abstract: geo2_7 - Surficial geology. ArcInfo polygon coverage. Item "glg" in Feature Attribute Table (FAT) is for geologic age. Purpose: The Data provide Government, geological community, consultants, and public with information on geologic basis of African continent. It intented to use as a reference spatial data. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -22.413353 East_Bounding_Coordinate: 64.540365 North_Bounding_Coordinate: 40.003867 South_Bounding_Coordinate: -38.574876 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Surface geology Place: Place_Keyword: Africa Access_Constraints: None Use_Constraints: None Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Feliks Persits Contact_Organization: U.S. Geological Survey, Central Region Contact_Position: U.S.G.S. contractor Contact_Address: Address_Type: mailing and physical address Address: U.S. Geological Survey Energy Resource Team, Box 25046, Denver Federal Center, MS 939 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-3612 Contact_Facsimile_Telephone: 303-236-8822 Contact_Electronic_Mail_Address: fpersits@usgs.gov Hours_of_Service: 8:00 am - 4:00 pm MST Browse_Graphic: Browse_Graphic_File_Name: africa.pdf Browse_Graphic_File_Type: PDF Data_Set_Credit: Digital Map Compilation - Feliks Persits Geological Attribution - Feliks Persits, Thomas Ahlbrandt, Michelle Tuttle, Ronald Charpentier, Michael Brownfield Security_Information: Security_Classification: Unclassified Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 8.1.1.649 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Standard ARC/INFO attributes accuracy in Feature Attributes Tables like AREA, PERIMETER, etc. depend on horizontal positional accuracy. All the additional attributes are character type. Quantitative_Attribute_Accuracy_Assessment: 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 the ARC/INFO coverage 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: Several geologic age subdivisions on the original (UNESCO) 1:5,000,000 geologic map were combined into single unit. As of May, 2000 generalizations of the original geologic map (UNESCO) were carried out: 1. All the Cretaceous units were combined into one. 2. All the Precambrian subdivisions were combined into one. 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 program 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 Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Commission for the Geological Map of the World (CGMW) Publication_Date: 1990 Title: Carte géologique internationale de l'Afrique Edition: 1987-1990 Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 5000000 Type_of_Source_Media: Paper Geologic Map Source_Time_Period_of_Content: 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. Process_Step: Process_Description: Transparent mylar film was used to extract geologic boundaries from paper geologic maps. Process_Date: 1996 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Dr. Thomas Ahlbrandt Contact_Organization: U.S. Geological Survey Contact_Position: Project Chief Contact_Voice_Telephone: 303-236-5776 Contact_Facsimile_Telephone: 303-236-8822 Contact_Electronic_Mail_Address: ahlbrandt@usgs.gov Hours_of_Service: 8 - 5 MST Process_Step: Process_Description: Scanning mylars on large format Anatech Eagle scanner in binary mode. Vectorizing binary images in UNIX ArcInfo 7.0.1 to produce ArcInfo coverages by GRIDLINE utility. Source_Used_Citation_Abbreviation: Mylar scanning Process_Date: 1996 Source_Produced_Citation_Abbreviation: ArcInfo coverages from binary images Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Ronald Charpentier Contact_Organization: US Geological Survey Contact_Position: Senior Geologist Contact_Voice_Telephone: 303-236-5766 Contact_Facsimile_Telephone: 303-236-8822 Contact_Electronic_Mail_Address: charpentier@usgs.gov Hours_of_Service: 8 - 5 MST Process_Step: Process_Description: Scanning original paper maps on a large format Anatech Eagle scanner in gray-scale mode. Source_Used_Citation_Abbreviation: Paper maps Process_Date: 1997 Source_Produced_Citation_Abbreviation: Gray-scale images Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Feliks Persits Contact_Organization: US Geological Survey Contact_Position: GIS Contractor Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center, P.O. Box 25046, MS 939 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-3612 Contact_Facsimile_Telephone: 303-236-8822 Contact_Electronic_Mail_Address: fpersits@usgs.gov Hours_of_Service: 8 - 5 MST Process_Step: Process_Description: Geologic age attributes were assigned to ArcInfo polygon coverage Source_Used_Citation_Abbreviation: ArcInfo coverages from binary images Process_Date: 1996 Source_Produced_Citation_Abbreviation: Attributed ArcInfo coverages from binary images Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Ronald. Charpentier Contact_Organization: US Geologcal Survey Contact_Position: GIS Contractor Contact_Voice_Telephone: 303-236-3612 Contact_Facsimile_Telephone: 303-236-8822 Contact_Electronic_Mail_Address: fpersits@usgs.gov Hours_of_Service: 5 - 8 MST Process_Step: Process_Description: ArcInfo coverages from binary images were transformed to Transverse Mercator projection with central meridian of 160 E and scale factor at a central meridian equal to 0.995. Source_Used_Citation_Abbreviation: Attribited ArcInfo coverages Process_Date: 1996 Source_Produced_Citation_Abbreviation: Projected ArcInfo coverages from binary images Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Feliks Persits Contact_Organization: US Geological Survey Contact_Position: GIS Contractor Contact_Voice_Telephone: 303-236-3612 Contact_Facsimile_Telephone: 303-236-8822 Contact_Electronic_Mail_Address: fpersits@usgs.gov Hours_of_Service: 5 - 8 MST Process_Step: Process_Description: Gray-scale images were georeferenced by ArcInfo REGISTER and RECTIFY utilities by using projected ArcInfo coverages from binary images. Source_Used_Citation_Abbreviation: Gray-scale images Process_Date: 1997 Source_Produced_Citation_Abbreviation: Georeferenced gray-scale images Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Feliks Persits Contact_Organization: U.S. Geological Survey Contact_Position: GIS Contractor Contact_Voice_Telephone: 303-236-3612 Contact_Facsimile_Telephone: 303-236-8822 Contact_Electronic_Mail_Address: fpersits@usgs.gov Hours_of_Service: 5 - 8 MST Process_Step: Process_Description: Verification and correction of line work and geologic attributing of projected ArcInfo coverages by using georeferenced gray-scale images as background images in ArcInfo ArcEdit 7.0.2 Source_Used_Citation_Abbreviation: Projected ArcInfo coverages Process_Date: 1997 Source_Produced_Citation_Abbreviation: Corrected ArcInfo coverages Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Feliks Persits Contact_Organization: U.S. Geological Survey Contact_Position: GIS Contractor Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center, P.O. Box 25046, MS 939 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-3612 Contact_Facsimile_Telephone: 303-236-8822 Contact_Electronic_Mail_Address: fpersits@usgs.gov Hours_of_Service: 8 - 5 MST Process_Step: Process_Description: Corrected ArcInfo coverages were projected to geographic coordinates and to Mercator projection with a central meridian of 250 E by ArcInfo PROJECT utility. Source_Used_Citation_Abbreviation: Corrected ArcInfo coverages Process_Date: 1997 Source_Produced_Citation_Abbreviation: Final ArcInfo coverages in Mercator projection and in geographic coordinates. Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Feliks Persits Contact_Organization: GIS Contractor Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center, P.O. Box 25046, MS 939 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-3612 Contact_Facsimile_Telephone: 303-236-8822 Contact_Electronic_Mail_Address: fpersits@usgs.gov Hours_of_Service: 5 - 8 MST 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: 11977 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Mercator Mercator: Standard_Parallel: 0.00 Longitude_of_Central_Meridian: 25.00 False_Easting: 0.00 False_Northing: 0.00 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.016384 Ordinate_Resolution: 0.016384 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: geo2_7t_polygon Attribute: Attribute_Label: OBJECTID Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: AREA 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 Attribute: Attribute_Label: PERIMETER 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 Attribute: Attribute_Label: GEO2_7T_ Attribute_Definition: Internal ID Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2 Range_Domain_Maximum: 11978 Attribute: Attribute_Label: GEO2_7T_ID Attribute_Label: GEO2_ID Attribute_Definition: User ID Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 11994 Attribute: Attribute_Label: GLG Attribute_Definition: Surface Geology Attribute Attribute_Definition_Source: U.S.Geological Survey 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. Attribute: Attribute_Label: Shape_Length Attribute_Definition: Length of feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: Shape_Area Attribute_Definition: Area of feature in internal units squared. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Distribution_Information: Distributor: Contact_Information: Contact_Organization: U.S. Geological Survey Earth Science Information Center (ESIC) Contact_Person_Primary:Dorothy Tanti Contact_Address: Address_Type: mailing and physical address Address: U.S.Geological Survey Box 25046 Building 25 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0286 Country: USA Contact_Voice_Telephone: 303.236.1647 Contact_Electronic_Mail_Address: eteamdisks@usgs.gov Hours_of_Service: 8:00 am - 4:00 pm MST Standard_Order_Process: 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) Metadata_Reference_Information: Metadata_Date: 20011019 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 Hours_of_Service: 8 am. to 4 pm. MST Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: