Illinois, Indiana, and Ohio magnetic and gravity maps and data

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Frequently anticipated questions:


What does this data set describe?

Title: Illinois, Indiana, and Ohio magnetic and gravity maps and data
Abstract:
Aeromagnetic surveys of Illinois, Indiana, and Ohio, merged to form seamless grids across the state. Gravity anomaly data are provided as well.
  1. How might this data set be cited?
    Daniels, David L., Kucks, Robert P., and Hill, Patricia L., 2008, Illinois, Indiana, and Ohio magnetic and gravity maps and data: Data Series 321, Geological Survey (U.S.), Denver CO.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -87.50
    East_Bounding_Coordinate: -84.82
    North_Bounding_Coordinate: 42.51
    South_Bounding_Coordinate: 36.97
  3. What does it look like?
    http://pubs.usgs.gov/ds/321/ilinoh_mag.gif (GIF)
    Reduced-size image of the aeromagnetic anomaly map, 400x269 pixels, 43k bytes
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 194811
    Ending_Date: Nov-1994
    Currentness_Reference:
    aeromagnetic surveys span this range of dates
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 822 x 1224, type Grid cell
    2. What coordinate system is used to represent geographic features?
      The map projection used is Lambert Conformal Conic.
      Projection parameters:
      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 coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 500
      Ordinates (y-coordinates) are specified to the nearest 500
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    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.htm

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Daniels, David L.
    • Kucks, Robert P.
    • Hill, Patricia L.
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Robert P Kucks
    USGS -- GD
    Geologist
    Box 25046
    Denver Federal Center
    Mail Stop 964
    Denver, CO
    USA

    303-236-1405 (voice)
    303-236-1425 (FAX)
    rkucks@usgs.gov

Why was the data set created?

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.

How was the data set created?

  1. From what previous works were the data drawn?
    GP-523 (source 1 of 24)
    Beck, M.E., Jr., 1965, Aeromagnetic map of northeastern Illinois and its geologic interpretation: U.S. Geological Survey Geophysical Investigations Map GP-523.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Illinois aeromagnetic data
    NUREG/CR-1014 (source 2 of 24)
    Braile, L.W. and others, 1979, 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: U.S. Nuclear Regulatory Commission Report NUREG/CR-1014.

    Type_of_Source_Media: paper
    Source_Contribution: Illinois aeromagnetic data
    GJBX-048(81) (source 3 of 24)
    EG&G GeoMetrics, Inc., 1981, Aerial gamma ray and magnetic survey, Danville quadrangle, Indiana and Illinois: U.S. Department Energy, Grand Junction Office Report GJBX-048(81).

    Type_of_Source_Media: paper
    Source_Contribution: Illinois and Indiana aeromagnetic data
    GJBX-059(81) (source 4 of 24)
    EG&G GeoMetrics, Inc., 1981, Aerial gamma ray and magnetic survey, Davenport quadrangle, Iowa and Illinois: U.S. Department Energy, Grand Junction Office Report GJBX-059(81).

    Type_of_Source_Media: paper
    Source_Contribution: Illinois aeromagnetic data
    GJBX-097(81) (source 5 of 24)
    EG&G GeoMetrics, Inc., 1981, Aerial gamma ray and magnetic survey, Indianapolis quadrangle, Indiana and Illinois: U.S. Department Energy Grand Junction Office Report GJBX-097(81).

    Type_of_Source_Media: paper
    Source_Contribution: Indiana aeromagnetic data
    GJBX-026(82) (source 6 of 24)
    Geodata International, Inc., 1982, Aerial radiometric and magnetic survey, St. Louis National Topographic Map, Illinois-Missouri: U.S. Department Energy, Grand Junction Office Report GJBX-026(82).

    Type_of_Source_Media: paper
    Source_Contribution: Illinois aeromagnetic data
    GJBX-027(82) (source 7 of 24)
    Geodata International, Inc., 1982, Aerial radiometric and magnetic survey, Quincy National Topographic Map, Illinois-Missouri: U.S. Department Energy, Grand Junction Office Report GJBX-027(82).

    Type_of_Source_Media: paper
    Source_Contribution: Illinois aeromagnetic data
    GJBX-028(82) (source 8 of 24)
    Geodata International, Inc., 1982, Aerial radiometric and magnetic survey, Burlington National Topographic Map, Illinois-Iowa-Missouri: U.S. Department Energy, Grand Junction Office Report GJBX-028(82).

    Type_of_Source_Media: paper
    Source_Contribution: Illinois aeromagnetic data
    C-495 (source 9 of 24)
    Heigold, P.C., 1976, An aeromagnetic survey of southwestern Illinois: Illinois State Geological Survey Circular C-495.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Illinois aeromagnetic data
    P316-B (source 10 of 24)
    Henderson, J.R., and Zietz, I., 1958, Interpretation of an aeromagnetic survey of Indiana: U.S. Geological Survey Professional Paper 316-B.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 500000
    Source_Contribution: Illinois and Indiana aeromagnetic data
    GJBX-181(81) (source 11 of 24)
    High Life Helicopters, Inc. and QEB, and Inc., 1981, Airborne gamma-ray spectrometer and magnetometer survey, Rockford quadrangle, Aurora quadrangle (Illinois), Madison quadrangle (Wisconsin): U.S. Department Energy, Grand Junction Office Report GJBX-181(81).

    Type_of_Source_Media: paper
    Source_Contribution: Illinois aeromagnetic data
    GJBX-241(81) (source 12 of 24)
    High Life Helicopters, Inc. and QEB, and Inc., 1981, Airborne gamma-ray spectrometer and magnetometer survey, Peoria, Decatur, and Belleville quadrangles (Illinois): U.S. Department Energy, Grand Junction Office Report GJBX-241(81).

    Type_of_Source_Media: paper
    Source_Contribution: Illinois aeromagnetic data
    GP-961 (source 13 of 24)
    Hildenbrand, T.G., and Kucks, R.P., 1984, Residual total intensity magnetic map of Ohio: U.S. Geological Survey GP-961.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 500000
    Source_Contribution: Ohio aeromagnetic data
    Hildenbrand and others (1992) (source 14 of 24)
    Hildenbrand, T.G., Kucks, R.P., and Heigold, P.C., 1992, Total intensity magnetic anomaly map of Illinois: Illinois State Geological Survey Geophysical Map 2.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 500000
    Source_Contribution: Illinois aeromagnetic data
    National Geophysical Data Center (2001) (source 15 of 24)
    Authority, Tennessee Valley, 2001, Aeromagnetics flight-line data: National Geophysical Data Center.

    Type_of_Source_Media: CD-ROM
    Source_Contribution: Ohio aeromagnetic data
    C-0122 (source 16 of 24)
    Natural Resources Canada Geoscience Data Repository, Lake Erie aeromagnetic survey C-0122.

    Type_of_Source_Media: digital data
    Source_Contribution: Ohio aeromagnetic data
    GP-491 (source 17 of 24)
    Philbin, P.W., Long, C.L., and Moore, F.C., 1965, Aeromagnetic map of the Columbus-Dayton area, Ohio and Indiana: U.S. Geological Survey Geophysical Investigations Map GP-491.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Indiana and Ohio aeromagnetic data
    GP-445 (source 18 of 24)
    Popenoe, P., Petty, A.J., and Tyson, N.S., 1964, Aeromagnetic map of western Pennsylvania and parts of eastern Ohio, northern West Virginia, and western Maryland: U.S. Geological Survey Geophysical Investigations Map GP-445.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Ohio aeromagnetic data
    OF80-615 (source 19 of 24)
    U.S. Geological Survey, 1980, Aeromagnetic map of southeastern Ohio: U.S. Geological Survey Open-File Report 80-615.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Ohio aeromagnetic data
    OF82-191 (source 20 of 24)
    U.S. Geological Survey, 1982, Aeromagnetic map of northern Ohio: U.S. Geological Survey Open-File Report 82-191.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Ohio aeromagnetic data
    OF82-190 (source 21 of 24)
    U.S. Geological Survey, 1982, Aeromagnetic map of northwestern Illinois: U.S. Geological Survey Open-File Report 82-190.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Ohio aeromagnetic data
    OF83-059 (source 22 of 24)
    U.S. Geological Survey, 1983, Aeromagnetic map of southern Ohio: U.S. Geological Survey Open-File Report 83-59.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Ohio aeromagnetic data
    OF99-0557 (source 23 of 24)
    U.S. Geological Survey, 1999, Digitized aeromagnetic datasets for the conterminous United States, Hawaii, and Puerto Rico: U.S. Geological Survey Open-File Report 99-557.

    Online Links:

    Type_of_Source_Media: CD-ROM
    Source_Contribution: US aeromagnetic data
    OF02-361 (source 24 of 24)
    U.S. Geological Survey, 2002, Digital aeromagnetic datasets for the conterminous United States and Hawaii: A companion to the North American magnetic anomaly map: U.S. Geological Survey Open-File Report 02-361.

    Online Links:

    Type_of_Source_Media: DVD
    Source_Contribution: US aeromagnetic data
  2. How were the data generated, processed, and modified?
    Date: 2008 (process 1 of 2)
    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. Data sources used in this process:
    • GP-523
    • NUREG/CR-1014
    • GJBX-048(81)
    • GJBX-059(81)
    • GJBX-097(81)
    • GJBX-026(82)
    • GJBX-027(82)
    • GJBX-028(82)
    • C-495
    • P316-B
    • GJBX-181(81)
    • GJBX-241(81)
    • GP-961
    • Hildenbrand and others (1992)
    • Hildenbrand and Ravat (1997)
    • National Geophysical Data Center (2001)
    • C-0122
    • GP-491
    • GP-445
    • OF80-615
    • OF82-191
    • OF82-190
    • OF83-059
    • OF99-0557
    • OF02-361
    Date: 12-Mar-2008 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Patricia L Hill
    USGS -- GD
    Box 25046
    Denver Federal Center
    Mail Stop 964
    Denver, CO
    USA

    303-236-1343 (voice)
    303-236-1425 (FAX)
    pathill@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    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
  5. How consistent are the relationships among the observations, including topology?
    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.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints: none
  1. Who distributes the data set? (Distributor 1 of 1)
    Patricia L Hill
    USGS -- GD
    Box 25046
    Denver Federal Center
    Mail Stop 964
    Denver, CO
    USA

    303-236-1343 (voice)
    303-236-1425 (FAX)
    pathill@usgs.gov
  2. What's the catalog number I need to order this data set? USGS Data Series 321
  3. What legal disclaimers am I supposed to read?
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 10-Jun-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://geo-nsdi.er.usgs.gov/metadata/digital-data/321/metadata.faq.html>
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