Identification_Information: Citation: Citation_Information: Originator: Daniels, David L. Originator: Kucks, Robert P. Originator: Hill, Patricia L. Title: Illinois, Indiana, and Ohio magnetic and gravity maps and data Publication_Date: 2008 Series_Information: Series_Name: Data Series Issue_Identification: 321 Publication_Information: Publisher: Geological Survey (U.S.) Publication_Place: Denver CO Online_Linkage: http://pubs.usgs.gov/ds/321/ Description: Abstract: Aeromagnetic surveys of Illinois, Indiana, and Ohio, merged to form seamless grids across the state. Gravity anomaly data are provided as well. Purpose: Acquire the best available public-domain aeromagnetic and gravity data in the United States and merge these data into uniform, composite grids for each state. The results for the three states, Illinois, Indiana, and Ohio are presented here in one site. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 194811 Ending_Date: 199411 Currentness_Reference: aeromagnetic surveys span this range of dates Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -87.50 East_Bounding_Coordinate: -84.82 North_Bounding_Coordinate: 42.51 South_Bounding_Coordinate: 36.97 Keywords: Place: Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4 Place_Keyword: fUS17 = Illinois Place_Keyword: fUS18 = Indiana Place_Keyword: fUS39 = Ohio Theme: Theme_Keyword_Thesaurus: General glossary for mineral resources spatial data Theme_Keyword: Geosoft grid format Theme_Keyword: GeoTIFF Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: aeromagnetic surveying Theme_Keyword: geophysics Theme_Keyword: geospatial datasets Theme_Keyword: gravimeter measurement Theme_Keyword: gravitational field (earth) Theme_Keyword: magnetic field (earth) Access_Constraints: none Use_Constraints: none Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Robert P Kucks Contact_Organization: USGS -- GD Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: Box 25046 Denver Federal Center Mail Stop 964 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-1405 Contact_Facsimile_Telephone: 303-236-1425 Contact_Electronic_Mail_Address: rkucks@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/ds/321/ilinoh_mag.gif Browse_Graphic_File_Description: Reduced-size image of the aeromagnetic anomaly map, 400x269 pixels, 43k bytes Browse_Graphic_File_Type: GIF Data_Quality_Information: Logical_Consistency_Report: The grids provided here were compiled from numerous independent data surveys conducted over nearly 50 years. Data from older surveys was digitized from contour maps; newer surveys provided the data digitally. Completeness_Report: Gravity station locations are shown in a separate grid which is provided. Aeromagnetic survey density is shown for the various surveys used at http://pubs.usgs.gov/ds/321/ilinoh_indmap.htm Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Beck, M.E., Jr. Title: Aeromagnetic map of northeastern Illinois and its geologic interpretation Publication_Date: 1965 Series_Information: Series_Name: U.S. Geological Survey Geophysical Investigations Map Issue_Identification: GP-523 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1965 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GP-523 Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Braile, L.W. and others Title: An integrated geophysical and geological study of the tectonic framework of the 38th Parallel Lineament in the vicinity of its intersection with the extension of the New Madrid fault zone Publication_Date: 1979 Series_Information: Series_Name: U.S. Nuclear Regulatory Commission Report Issue_Identification: NUREG/CR-1014 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1979 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NUREG/CR-1014 Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: EG&G GeoMetrics, Inc. Title: Aerial gamma ray and magnetic survey, Danville quadrangle, Indiana and Illinois Publication_Date: 1981 Series_Information: Series_Name: U.S. Department Energy, Grand Junction Office Report Issue_Identification: GJBX-048(81) Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1981 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GJBX-048(81) Source_Contribution: Illinois and Indiana aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: EG&G GeoMetrics, Inc. Title: Aerial gamma ray and magnetic survey, Davenport quadrangle, Iowa and Illinois Publication_Date: 1981 Series_Information: Series_Name: U.S. Department Energy, Grand Junction Office Report Issue_Identification: GJBX-059(81) Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1981 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GJBX-059(81) Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: EG&G GeoMetrics, Inc. Title: Aerial gamma ray and magnetic survey, Indianapolis quadrangle, Indiana and Illinois Publication_Date: 1981 Series_Information: Series_Name: U.S. Department Energy Grand Junction Office Report Issue_Identification: GJBX-097(81) Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1981 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GJBX-097(81) Source_Contribution: Indiana aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Geodata International, Inc. Title: Aerial radiometric and magnetic survey, St. Louis National Topographic Map, Illinois-Missouri Publication_Date: 1982 Series_Information: Series_Name: U.S. Department Energy, Grand Junction Office Report Issue_Identification: GJBX-026(82) Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1982 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GJBX-026(82) Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Geodata International, Inc. Title: Aerial radiometric and magnetic survey, Quincy National Topographic Map, Illinois-Missouri Publication_Date: 1982 Series_Information: Series_Name: U.S. Department Energy, Grand Junction Office Report Issue_Identification: GJBX-027(82) Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1982 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GJBX-027(82) Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Geodata International, Inc. Title: Aerial radiometric and magnetic survey, Burlington National Topographic Map, Illinois-Iowa-Missouri Publication_Date: 1982 Series_Information: Series_Name: U.S. Department Energy, Grand Junction Office Report Issue_Identification: GJBX-028(82) Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1982 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GJBX-028(82) Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Heigold, P.C. Title: An aeromagnetic survey of southwestern Illinois Publication_Date: 1976 Series_Information: Series_Name: Illinois State Geological Survey Circular Issue_Identification: C-495 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1976 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: C-495 Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Henderson, J.R. Originator: Zietz, I. Title: Interpretation of an aeromagnetic survey of Indiana Publication_Date: 1958 Series_Information: Series_Name: U.S. Geological Survey Professional Paper Issue_Identification: 316-B Source_Scale_Denominator: 500000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1958 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: P316-B Source_Contribution: Illinois and Indiana aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: High Life Helicopters, Inc. and QEB Originator: Inc. Title: Airborne gamma-ray spectrometer and magnetometer survey, Rockford quadrangle, Aurora quadrangle (Illinois), Madison quadrangle (Wisconsin) Publication_Date: 1981 Series_Information: Series_Name: U.S. Department Energy, Grand Junction Office Report Issue_Identification: GJBX-181(81) Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1981 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GJBX-181(81) Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: High Life Helicopters, Inc. and QEB Originator: Inc. Title: Airborne gamma-ray spectrometer and magnetometer survey, Peoria, Decatur, and Belleville quadrangles (Illinois) Publication_Date: 1981 Series_Information: Series_Name: U.S. Department Energy, Grand Junction Office Report Issue_Identification: GJBX-241(81) Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1981 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GJBX-241(81) Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Hildenbrand, T.G. Originator: Kucks, R.P. Title: Residual total intensity magnetic map of Ohio Publication_Date: 1984 Series_Information: Series_Name: U.S. Geological Survey Issue_Identification: GP-961 Source_Scale_Denominator: 500000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1984 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GP-961 Source_Contribution: Ohio aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Hildenbrand, T.G. Originator: Kucks, R.P. Originator: Heigold, P.C. Title: Total intensity magnetic anomaly map of Illinois Publication_Date: 1992 Series_Information: Series_Name: Illinois State Geological Survey Geophysical Map Issue_Identification: 2 Source_Scale_Denominator: 500000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1992 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Hildenbrand and others (1992) Source_Contribution: Illinois aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Tennessee Valley Authority Title: Aeromagnetics flight-line data Publication_Date: 2001 Publication_Information: Publisher: National Geophysical Data Center Type_of_Source_Media: CD-ROM Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2001 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: National Geophysical Data Center (2001) Source_Contribution: Ohio aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Natural Resources Canada Geoscience Data Repository Title: Lake Erie aeromagnetic survey C-0122 Online_Linkage: http://gdrdap.agg.nrcan.gc.ca/geodap/index_e.html Type_of_Source_Media: digital data Source_Citation_Abbreviation: C-0122 Source_Contribution: Ohio aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Philbin, P.W. Originator: Long, C.L. Originator: Moore, F.C. Title: Aeromagnetic map of the Columbus-Dayton area, Ohio and Indiana Publication_Date: 1965 Series_Information: Series_Name: U.S. Geological Survey Geophysical Investigations Map Issue_Identification: GP-491 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1965 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GP-491 Source_Contribution: Indiana and Ohio aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: Popenoe, P. Originator: Petty, A.J. Originator: Tyson, N.S. Title: Aeromagnetic map of western Pennsylvania and parts of eastern Ohio, northern West Virginia, and western Maryland Publication_Date: 1964 Series_Information: Series_Name: U.S. Geological Survey Geophysical Investigations Map Issue_Identification: GP-445 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1964 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: GP-445 Source_Contribution: Ohio aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Title: Aeromagnetic map of southeastern Ohio Publication_Date: 1980 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 80-615 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1980 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: OF80-615 Source_Contribution: Ohio aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Title: Aeromagnetic map of northern Ohio Publication_Date: 1982 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 82-191 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1982 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: OF82-191 Source_Contribution: Ohio aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Title: Aeromagnetic map of northwestern Illinois Publication_Date: 1982 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 82-190 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1982 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: OF82-190 Source_Contribution: Ohio aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Title: Aeromagnetic map of southern Ohio Publication_Date: 1983 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 83-59 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1983 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: OF83-059 Source_Contribution: Ohio aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Title: Digitized aeromagnetic datasets for the conterminous United States, Hawaii, and Puerto Rico Publication_Date: 1999 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 99-557 Online_Linkage: http://pubs.usgs.gov/of/1999/ofr-99-0557/html/mag_home.htm Type_of_Source_Media: CD-ROM Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: OF99-0557 Source_Contribution: US aeromagnetic data Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Title: Digital aeromagnetic datasets for the conterminous United States and Hawaii: A companion to the North American magnetic anomaly map Publication_Date: 2002 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 02-361 Online_Linkage: http://pubs.usgs.gov/of/2002/ofr-02-361/ Type_of_Source_Media: DVD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: OF02-361 Source_Contribution: US aeromagnetic data Process_Step: Process_Description: The assembly of 19 individual magnetic surveys and grids to create the Illinois, Indiana, and Ohio State-wide compilation was accomplished in several steps using the commercial software package Geosoft Oasis montaj. References listed are those known to be used as part of the package. The following steps were executed using commercial software package Geosoft Oasis montaj: 1. Grids were constructed from the original magnetic survey data with a cell size of between 1/3 and 1/5 of the flight-line spacing of the survey using a minimum curvature gridding algorithm (Webring, 1981). For digitized contour line data, the initial grid was constructed using a minimum curvature algorithm and a spacing appropriate for the scale of the digitized map. 2. The Definitive Geomagnetic Reference Field (DGRF) calculated for the date of the original survey was removed (in some cases this required the determination and addition of the original reference field that was removed before final removal of the DGRF). 3. Some of the data required microlevelling before continuation to our reference surface. This procedure uses decorrugation and attempts to remove any artificial trends or anomalies due to residual flight-line noise remaining in the data. The grids resultant from these three steps (whether or not microlevelling was performed) whose grid spacing is less than or equal to a grid cell size of 100 m (~330 ft) are available for downloading as indicated on the "Higher Resolution Aeromagnetic Maps" page. 4. The original survey grids were continued to 305 m (~1,000 ft) above ground as necessary. Upward continuation of the NURE and digitized draped surveys was by standard 2D FFT (two-dimensional Fast Fourier Transform) filtering techniques. Level-to-drape continuation and surface-to-drape continuation, where true measurement elevations were known, were performed using the chessboard method (Cordell and others, 1982). 5. The survey grids were regridded, as necessary, to the final grid cell size of 500 m (~1,640 ft) using a minimum curvature algorithm. 6. These adjusted grids were levelled and merged into a single grid that depicts the magnetic field measured or calculated at 305 m (~1,000 ft) above ground. This level was selected in order to be compatible with recent USGS State compilations. Source_Used_Citation_Abbreviation: GP-523 Source_Used_Citation_Abbreviation: NUREG/CR-1014 Source_Used_Citation_Abbreviation: GJBX-048(81) Source_Used_Citation_Abbreviation: GJBX-059(81) Source_Used_Citation_Abbreviation: GJBX-097(81) Source_Used_Citation_Abbreviation: GJBX-026(82) Source_Used_Citation_Abbreviation: GJBX-027(82) Source_Used_Citation_Abbreviation: GJBX-028(82) Source_Used_Citation_Abbreviation: C-495 Source_Used_Citation_Abbreviation: P316-B Source_Used_Citation_Abbreviation: GJBX-181(81) Source_Used_Citation_Abbreviation: GJBX-241(81) Source_Used_Citation_Abbreviation: GP-961 Source_Used_Citation_Abbreviation: Hildenbrand and others (1992) Source_Used_Citation_Abbreviation: Hildenbrand and Ravat (1997) Source_Used_Citation_Abbreviation: National Geophysical Data Center (2001) Source_Used_Citation_Abbreviation: C-0122 Source_Used_Citation_Abbreviation: GP-491 Source_Used_Citation_Abbreviation: GP-445 Source_Used_Citation_Abbreviation: OF80-615 Source_Used_Citation_Abbreviation: OF82-191 Source_Used_Citation_Abbreviation: OF82-190 Source_Used_Citation_Abbreviation: OF83-059 Source_Used_Citation_Abbreviation: OF99-0557 Source_Used_Citation_Abbreviation: OF02-361 Process_Date: 2008 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid cell Row_Count: 822 Column_Count: 1224 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Lambert Conformal Conic Lambert_Conformal_Conic: Standard_Parallel: 33.0 Standard_Parallel: 45.0 Longitude_of_Central_Meridian: -83.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 0.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 500 Ordinate_Resolution: 500 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Aeromagnetic anomaly grid cells are given in nanoteslas, and values are expected to range from -400 to 400. Gravity anomaly grid cells are given in milligals. Values are expected to range from -64 to 0 for complete Bouguer anomaly and from -40 to 20 for isostatic anomaly. Grids are provided in Geosoft's binary (proprietary) format with georeference information stored in an ancillary file and as TIFF images with georeference transformation information stored in an ancillary .tfw "world" file. Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/ds/321/ilinoh_desc.htmDistribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Patricia L Hill Contact_Organization: USGS -- GD Contact_Address: Address_Type: mailing address Address: Box 25046 Denver Federal Center Mail Stop 964 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-1343 Contact_Facsimile_Telephone: 303-236-1425 Contact_Electronic_Mail_Address: pathill@usgs.gov Resource_Description: USGS Data Series 321 Distribution_Liability: Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Geosoft GRD Format_Version_Number: Format_Information_Content: Wabash valley surveyed at 100m: magnetic anomaly File_Decompression_Technique: not compressed Transfer_Size: 30 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_4163.grd Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_4163.grd.gi Digital_Form: Digital_Transfer_Information: Format_Name: TIFF Format_Version_Number: 6.0 Format_Information_Content: Wabash valley surveyed at 100m: magnetic anomaly File_Decompression_Technique: not compressed Transfer_Size: 30 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_4163.tfw Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_4163.tif Digital_Form: Digital_Transfer_Information: Format_Name: Geosoft GRD Format_Version_Number: Format_Information_Content: Illinois, Indiana, and Ohio: complete Bouguer anomaly (gravity) File_Decompression_Technique: not compressed Transfer_Size: 30 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_cba.grd Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_cba.grd.gi Digital_Form: Digital_Transfer_Information: Format_Name: TIFF Format_Version_Number: 6.0 Format_Information_Content: Illinois, Indiana, and Ohio: complete Bouguer anomaly (gravity) File_Decompression_Technique: not compressed Transfer_Size: 30 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_cba.tfw Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_cba.tif Digital_Form: Digital_Transfer_Information: Format_Name: Geosoft GRD Format_Version_Number: Format_Information_Content: Illinois, Indiana, and Ohio: isostatic anomaly (gravity) File_Decompression_Technique: not compressed Transfer_Size: 30 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_iso.grd Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_iso.grd.gi Digital_Form: Digital_Transfer_Information: Format_Name: TIFF Format_Version_Number: 6.0 Format_Information_Content: Illinois, Indiana, and Ohio: isostatic anomaly (gravity) File_Decompression_Technique: not compressed Transfer_Size: 30 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_iso.tfw Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_iso.tif Digital_Form: Digital_Transfer_Information: Format_Name: Geosoft GRD Format_Version_Number: Format_Information_Content: Illinois, Indiana, and Ohio: magnetic anomaly File_Decompression_Technique: not compressed Transfer_Size: 30 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_mag.grd Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_mag.grd.gi Digital_Form: Digital_Transfer_Information: Format_Name: TIFF Format_Version_Number: 6.0 Format_Information_Content: Illinois, Indiana, and Ohio: magnetic anomaly File_Decompression_Technique: not compressed Transfer_Size: 30 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_mag.tfw Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_mag.tif Digital_Form: Digital_Transfer_Information: Format_Name: TIFF Format_Version_Number: 6.0 Format_Information_Content: Illinois, Indiana, and Ohio: gravity station locations File_Decompression_Technique: not compressed Transfer_Size: 30 megabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_sta.tfw Network_Resource_Name: http://pubs.usgs.gov/ds/321/data/ilinoh_sta.tif Fees: none Metadata_Reference_Information: Metadata_Date: 20080312 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Patricia L Hill Contact_Organization: USGS -- GD Contact_Address: Address_Type: mailing address Address: Box 25046 Denver Federal Center Mail Stop 964 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-1343 Contact_Facsimile_Telephone: 303-236-1425 Contact_Electronic_Mail_Address: pathill@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998