Illinois Historical Aerial Photographs: Photo Mosaic County Indexes v.4

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Frequently-anticipated questions:


What does this data set describe?

Title:
Illinois Historical Aerial Photographs: Photo Mosaic County Indexes v.4
Abstract:
This data set consists of photo mosaic county indexes of historical black and white aerial photographs from Illinois acquired during the late 1930s and early 1940s. The original paper county indexes have been scanned and saved as TIFF format images. The images available online are MrSID files, in which the original TIFF files were compressed at a target ratio of 10:1 or 6:1 (see process steps "IMAGE COMPRESSION" below). The scale of the data varies from county to county.

These data have not been geometrically corrected.

  1. How should this data set be cited?

    Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: Photo Mosaic County Indexes v.4.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -91.675280
    East_Bounding_Coordinate: -87.483350
    North_Bounding_Coordinate: 42.564692
    South_Bounding_Coordinate: 36.911398

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 1936
    Ending_Date: 1941
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: raster digital data

  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, type Pixel

    2. What coordinate system is used to represent geographic features?

      This local coordinate system was used: These data are not geometrically corrected.

      Not Applicable

      The horizontal datum used is none.
      The ellipsoid used is none.
      The semi-major axis of the ellipsoid used is none.
      The flattening of the ellipsoid used is 1/none.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview: none
    Entity_and_Attribute_Detail_Citation: Not Applicable


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Deette Lund
    Illinois State Geological Survey
    Assistant Supportive Scientist
    615 East Peabody Drive
    Champaign, Illinois 61820
    USA

    217-265-5642 (voice)
    217-244-2785 (FAX)
    lund@isgs.illinois.edu

    Hours_of_Service: 8:00 a.m. - 5:00 p.m., Monday-Friday
    Contact_Instructions:
    Contact this individual ONLY for specific information about the use of this data set. For general questions about distribution, or availability of other data, please contact the Database Administrator listed under the Distribution_Information section.


Why was the data set created?

These data are provided as supplemental imagery to aid in understanding the organization of the historical aerial photography collections.


How was the data set created?

  1. From what previous works were the data drawn?

    Not Applicable (source 1 of 1)
    unknown, Unpublished Material, Illinois Historical Aerial Photograph Photo Mosaic County Indexes: UIUC Map and Geography Library, Champaign, Illinois.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: varies
    Source_Contribution: Not Applicable

  2. How were the data generated, processed, and modified?

    Date: 2001 (process 1 of 6)
    SCANNING METHODOLOGY: Original copies of the county indexes are located at the University of Illinois Map and Geography Library. Special permission was granted by the Library for the county index sheets to be scanned at an offsite location. The indexes were scanned on a large format Eagle 4080 scanner located at the Illinois State Geological Survey. The photo mosaic indexes were scanned at 600 dpi as grayscale images (2001-2004).

    In December 2004 Historic Information Gatherers, Inc.(HIG), Hopkins, Minnesota, scanned all of the remaining county index sheets (photo mosaic and line indexes that hadn't already been scanned by the ISGS) available at the UIUC Map and Geography Library (~1700 sheets). In Spring 2005 HIG provided the ISGS with digital images of the photo and line indexes. The indexes were scanned on a large format Vidar Titan Atlas P93 scanner temporarily located at the UIUC Map and Geography Library. The photo mosaic indexes were scanned at 300 dpi as indexed color images (2004).

    Date: 2003 (process 2 of 6)
    IMAGE MANIPULATION (2003-2004): The photo mosaic indexes were downsampled to 300 dpi using Adobe Photoshop. The image was also adjusted for brightness and contrast to make annotations on the image more apparent.

    Date: 2006 (process 3 of 6)
    IMAGE MANIPULATION (2006-2008): The image was changed to a grayscale image using Adobe Photoshop. The image was also adjusted for brightness and contrast to make annotations on the image more apparent.

    Date: 2003 (process 4 of 6)
    IMAGE COMPRESSION (2003-2004): This methodology was employed for 19 counties that were scanned. These counties include Brown, Bureau, Calhoun, Cass, Champaign, Coles, Cook, Grundy, Johnson, Knox, LaSalle, McHenry, Monroe, Peoria, St. Clair, Sangamon, Union, Vermilion and Will Counties.

    The original scanned files are archived in TIFF format on CD-ROM at the Illinois State Geological Survey.

    The files available for download have been compressed using LizardTech's GeoExpress (Solaris platform) MrSID version 1.3.1 software at a compression ratio of 10:1.

    Date: 2006 (process 5 of 6)
    IMAGE COMPRESSION (2006-2007): This methodology was employed for 10 counties that were scanned. These counties include Boone, Douglas, Edwards, Gallatin, Hardin, JoDaviess, Pope, Saline, Williamson, and Winnebago Counties.

    A copy of the original scanned files are archived in TIFF format on CD-ROM at the Illinois State Geological Survey.

    The files available for download have been compressed using LizardTech's GeoExpress (Solaris platform) MrSID Version 5.0.6.1088.Bob_1055_br software at a compression ratio of 6:1.

    Date: 2008 (process 6 of 6)
    IMAGE COMPRESSION (2008): This methodology was employed for 4 counties that were scanned. These counties include Alexander, Jackson, Perry and Randolph Counties.

    A copy of the original scanned files are archived in TIFF format on CD-ROM at the Illinois State Geological Survey.

    The files available for download have been compressed using LizardTech's GeoExpress (Solaris platform) MrSID Version 6.0.0.1331.Bob_1304_br software at a compression ratio of 6:1.

  3. What similar or related data should the user be aware of?

    Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: 1936 to 1941: Illinois State Geological Survey, Champaign, Illinois.

    Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: County Index Data Layer: Illinois State Geological Survey, Champaign, Illinois.

    Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: Schematic County Indexes: Illinois State Geological Survey, Champaign, Illinois.

    , ISGS Terms of Use.

    Online Links:

    , University of Illinois Web Privacy Notice.

    Online Links:

    , University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4).

    Online Links:

    , Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign.

    Online Links:


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?

    These data have not been geometrically corrected.

  3. How accurate are the heights or depths?

    These data have not been orthorectified.

  4. Where are the gaps in the data? What is missing?

    Not Applicable

  5. How consistent are the relationships among the observations, including topology?

    Not Applicable


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current.

Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice.

Links to these are provided in the Cross References section.

Use_Constraints:
ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved.  University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section.

Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage.

Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section.

Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data.  Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor.

The data do not replace the need for detailed site-specific studies.

  1. Who distributes the data set? (Distributor 1 of 1)

    Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
    Clearinghouse Administrator
    615 East Peabody Drive
    Champaign, Illinois 61820
    USA

    217-244-9306 (voice)
    217-333-2830 (FAX)
    beavrsn@isgs.illinois.edu

    Hours_of_Service: 8:00 a.m. - 5:00 p.m., Monday-Friday
    Contact_Instructions:
    Contact this individual ONLY for specific information about distribution of this data set, or availability of other data.
  2. What's the catalog number I need to order this data set?

    A TIFF format file is currently available free of charge at the Illinois Natural Resources Geospatial Data Clearinghouse. Refer to the Identification_Information portion of this file for access to downloadable data and metadata.

  3. What legal disclaimers am I supposed to read?

    Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (there is a link in the Cross References section) for policy statements regarding the following:

    Disclaimer of Liability Disclaimer of Warranties and Accuracy of Data Disclaimer of Endorsement Disclaimer for External Links Disclaimer of Duty to Continue Provision of Data Security Choice of Law

    By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 16-Apr-2009
Last Reviewed: 16-Apr-2009
To be reviewed: 2009
Metadata author:
Illinois State Geological Survey
c/o Deette Lund
Assistant Supportive Scientist
615 East Peabody Drive
Champaign, Illinois 61820
USA

217-265-5642 (voice)
217-244-2785 (FAX)
lund@isgs.illinois.edu

Hours_of_Service: 8:00 a.m. - 5:00 p.m., Monday-Friday
Contact_Instructions:
Contact this individual ONLY for specific information about this metadata. For general questions about distribution, or availability of other data, please contact the Database Administrator listed under the Distribution_Information section.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


Illinois Natural Resources Geospatial Data Clearinghouse

Generated by mp version 2.8.25 on Thu Apr 16 11:22:30 2009