Identification_Information: Citation: Citation_Information: Originator: Sarah W. Polster Originator: Benjamin J. Drenth Publication_Date: 2011 Title: Digitized Data from Ground Geophysical Surveys in Afghanistan: A Website for Distribution of Data Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: Open-File Report 2011-1270 Publication_Information: Publication_Place: Denver, Colorado, USA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2011/1270 Description: Abstract: This document describes the process of digitization of a 1974 report on geophysical work undertaken by Soviet geophysicists in southern and eastern Afghanistan. These data, uncovered in Afghanistan, represent magnetic and electrical ground surveys for which locations are not well defined. Due to lack of location information, these surveys were georeferenced using the cities, rivers, and surrounding geology found on maps to plot survey locations. A geologic map found in the Soviet report contains profile lines that correspond to the geophysical maps, allowing these data to be georeferenced. The profiles correspond to sets of resistivity, chargeabiliy, and magnetic data. Some datasets were presented as graphs and needed to be gridded into a useable image. Only the vertical component of the magnetic field was collected, so conversion to total field anomaly was necessary. The magnetic data was collected in either gammas or mOe, both of which required conversion. To be useful to modern studies, the datasets and images contained in this report have been digitized, georeferenced, and in some cases converted into computer-ready formats. Purpose: Data collected during this survey will provide basic information for mineral and petroleum exploration studies, which are important for the economic development of Afghanistan. Additionally, use of this data is broadly applicable in the assessment of water resources and natural hazards, the inventory and planning of civil infrastructure and agricultural resources,and the construction of detailed maps. The U.S. Geological Survey is currently funded by the US Agency of International Development to conduct resource assessments of the country of Afghanistan for mineral, energy, coal, hazards, and water resources. These geophysical and remote sensing data will be used directly in the resources assessments. Time_Period_of_Content: 1972-1974 Time_Period_Information: 1972-1974 Range_of_Dates/Times: Beginning_Date: 1972 Ending_Date: 1974 Currentness_Reference: survey dates Status: Progress: complete Maintenance_and_Update_Frequency: none planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: 60.° E. longitude East_Bounding_Coordinate: 71.° E. longitude North_Bounding_Coordinate: 38.° N. latitude South_Bounding_Coordinate: 29.° N. latitude Keywords: Place: Place_Keyword_Thesaurus: none Place_Keyword: Afghanistan Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: geophysical data Theme_Keyword: resistivity data Theme_Keyword: aeromagnetic data Theme_Keyword: aeromagnetic grid Access_Constraints: none Use_Constraints: none Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Sarah Polster Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: Box 25046, MS964 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-1201 Contact_Electronic_Mail_Address: spolster@usgs.gov Native_Data_Set_Environment: These grids and databases were created using USGS processing programs on a UNIX system and on a PC using Geosoft/OASIS montaj application software. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The digital data are Geosoft databases and grids, which were created from a Soviet report (Appendix 1) of aeromagnetic, resisitivity and chargeability maps and data in this report. Data accuracies thus coincided with the original survey/data processing accuracies. The final magnetic grid interval of 500 m was chosen as representative. The data in the original grids have been processed using formulas and methods that are not usually documented but that represent industry standard practices for airborne data reduction. Logical_Consistency_Report: Standard industry practices of the time were followed in data collection and processing. Completeness_Report: Some pieces of original data are missing, but all usable data is represented in the grids. Positional_Accuracy: unknown Lineage: Process_Step: Process_Description: A description of the magnetic data processing steps are located in this Open-File Report. Process_Date: 2006-2010 Process_Step: Process_Description: The initial aeromagnetic and ground magnetic grids for this survey were constructed using a minimum curvature algorithm. Process_Date: 2010-2011 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Three vertical component magnetic anomaly grids, three total field magnetic anomaly maps, three chargeability maps, three resistivity maps, and seven databases are included in this report: kalay_pk.grd - Geosoft binary grid format Final Kalay-Asad study area resistivity map containing data from the survey described in this report Kalay_nk.grd - Geosoft binary grid format Final Kalay_Asad study area chargeability grid containing data from the survey described in this report dari-nk.grd - Geosoft database format Final Darainoor study area chargeability grid containing data from the survey described in this report. dari_pk.grd - Geosoft database format Final Darainoor study area resistivity grid containing data from the survey described in this report. zark_pk.grd - Geosoft database format Final Zarkashan study area resistivity grid containing data from the survey described in this report. zark_nk.grd - Geosoft database format Final Zarkashan study area chargeability grid containing data from the survey described in this report. oruz_deltaZ.grd - Geosoft database format Final Oruzgan study area vertical component magnetic anomaly grid containing data from the survey described in this report. oruz_mask.grd - Geosoft database format Final Oruzgan study area total field magnetic anomaly grid containing data from the survey described in this report. d-k_deltaZ.grd - Geosoft database format Final Darainoor and Kalay-Asad study areas vertical component magnetic anomaly grid containing data from the survey described in this report. d-k_mask.grd - Geosoft database format Final Darainoor and Kalay-Asad study areas total magnetic field anomaly grid containing data from the survey described in this report. zark_deltaZ.grd - Geosoft database format Final Zarkashan study area vertical component magnetic anomaly grid containing data from the survey described in this report. zark_totalfield.grd - Geosoft database format Final Zarkashan study area total magnetic field anomaly grid containing data from the survey described in this report. Kundalen.gdb - Geosoft database format Ground magnetic data acquired from Soviet maps in the Darainoor and Kalay-Asad study areas. Darainoor_Nx.gdb - Geosoft database format Chargeability data acquired from Soviet stacked profiles in the Darainoor study area. Kalay_nk.gdb - Geosoft database format Chargeability data acquired from Soviet stacked profiles in the Kalay-Asad study area. Kalay_pk.gdb - Geosoft database format Resistivity data acquired from Soviet maps in the Kalay-Asad study area. oruzgan.gdb - Geosoft database format Ground magnetic data acquired from Soviet maps in the Oruzgan study area. Zark_shapes.gdb - Geosoft database format Ground magnetic data acquired from Soviet maps in the Zarkashan study area. The grid projection specifications for the above grid and databases are provided in detail in this open-file report. Entity_and_Attribute_Detail_Citation: Open-File Report 2010-xxxx Detailed_Description: Entity_Type: Entity_Type_Label: gridded aeromagnetic Entity_Type_Definition: Ascii real number value Entity_Type_Definition_Source: well-established geophysical data quantities Attribute: Attribute_Label: Residual total intensity of Earth's magnetic field Attribute_Definition: The total magnetic value minus a geomagnetic reference field, which is a long-wavelength regional magnetic field. The most commonly used reference field is calculated from the theoretical International Geomagnetic Reference Field (IGRF). Attribute_Definition_Source: Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -455.57 Range_Domain_Maximum: 373.79 Attribute_Units_of_Measure: nanoteslas Detailed_Description: Entity_Type: Entity_Type_Label: gridded aeromagnetic Entity_Type_Definition: Ascii real number value Entity_Type_Definition_Source: well-established geophysical data quantities Attribute: Attribute_Label: Residual total intensity of Earth's magnetic field Attribute_Definition: The total magnetic value minus a geomagnetic reference field, which is a long-wavelength regional magnetic field. The most commonly used reference field is calculated from the theoretical International Geomagnetic Reference Field (IGRF). This grid consists of the ground magnetic survey data described in this report, merged with the residual magnetic field data found in the U. S. Geological Survey Open_File Report 2006-1204 and Open-File Report 2006-1325. The data were gridded at 1000 m final grid cell size using a minimum curvature algorithm and continued to 5000 m above terrain. Attribute_Definition_Source: Contact_Information: Contact_Person_Primary: Contact_Person: Sarah Polster Contact_Organization: U. S. Geological Survey Contact_Address: Address_Type: mailing address Address: Box 25046, MS 964 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-1201 Contact_Electronic_Mail_Address: spolster@usgs.gov Resource_Description: USGS Open-File Report 2010-1270 Distribution_Liability: The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: grd - gridded data files gdb - database files txt - ASCII description files Transfer_Size: 1.4 Gbytes is the largest file size Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2011/1270 Fees: no charge for online downloads Metadata_Reference_Information: Metadata_Date: 20070411 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Sarah Polster Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey Box 25046 Mail Stop 964 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-1201 Contact_Electronic_Mail_Address: spolster@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998