Illinois Historical Aerial Photographs: County Index Data v.4

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Frequently-anticipated questions:


What does this data set describe?

Title: Illinois Historical Aerial Photographs: County Index Data v.4
Abstract:
Aerial photograph center point Index Data are offered by county in ESRI Shapefile format. The center points direct the user to non-geometrically corrected Illinois historical black and white aerial photography acquired during the late 1930s and early 1940s. The center points were created on an county by county basis. These Index Data contain information for each aerial photograph, including digital file name, flight line, county name, historical county code, roll and exposure numbers, agency which contributed the original photographic paper print for scanning, acquisition date, time flown (if available), the CD-ROM on which the original file is stored at the ISGS, and any additional notes.
Supplemental_Information:
The center point locations are only approximate. More information about the center points can be found in the "Data_Quality_Information" section of this metadata.
  1. How should this data set be cited?

    Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: County Index Data v.4.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: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Entity point

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
     Attribute items are in typical ARC/INFO feature class format.
    
     POINT ATTRIBUTES:
      Point attributes indicate approximate center points of historical
      aerial photographs. Point items other than the Arc/Info defaults are
      as follows:
    
      IMAGE_SCAN - Availability
                    YES - Aerial photograph is scanned and available on-line.
                    NO - Aerial photograph is shown or listed on a
                         county index but has not been scanned because of
                         the following reasons:
                         a)  not available,
                         b) damaged and/or unusable,
                         c) no funds were available.
    
      FILE_NAME - Electronic file name
                    Naming conventions for file names are based on annotation
                    included on the photographs and include codes for county,
                    roll number, and exposure number; zeros are used as
                    placeholders. Flight line information is not included in
                    the file name.
    
                    Annotation example from file "0bwq04036.sid":
                    11-15-38  12:30      AAA SCALE 1:20,000     BWQ  4-36
    
                    11-15-38 = acquisition date (November 15, 1938)
                    12:30 = acquisition time (12:30 PM Central Standard Time)
                    AAA = Agricultural Adjustment Administration
                    SCALE 1:20,000 = Representative Fraction (RF) scale,
                    1 unit on the photograph equals 20,000 units on
                         the ground.
                    BWQ = county code for Cook County, Illinois
                    4-36 = roll-exposure number; film roll=4, exposure=36
    
      CNTY_NAME - County name
    
      CNTY_CODE - Unique county code as annotated on the aerial photograph
    
      CNTY_FIPS - County 3-digit FIPS code
    
      DATE_FLOWN - Acquisition date of aerial photograph represented
                  as yyyymmdd (year, month, day)
    
      TIME_FLOWN - Time of exposure
                    Indicates acquisition time of aerial photograph
                      xx:xx    - Time of day (note: aerial photographs
                                 from these collections were not flown
                                 during night time hours)
                      unknown  - Aerial photograph was not available
                                 or county photograph mosaic index did
                                 not show any annotation regarding time.
                      no stamp - Aerial Photograph was available, but
                                 neither the photograph nor the
                                 photograph mosaic county index show a
                                 time stamp.
    
      FLIGHT_LIN - Flight line number
                    The location of the first flight line in each county is
                    dependent on whether the flight line orientation is north
                    to south or east to west. If the flight line orientation
                    is north to south, then flight line 1 is the first
                    vertical line of photographs on the left side of
                    the county index.
    
                    If the flight line orientation is east to west,
                    then flight line 1 is the first horizontal line
                    of photographs at the top of the county index.
    
      ROLL_EXP - Hyphenated number
                    The first number represents the film roll number which is
                    the source of the photograph. The second is the exposure
                    number of the photograph on that film roll.
    
      IMAGE_SRC - Abbreviation of collection from which the photograph
                  was acquired
                    ISL     - Illinois State Library
                    UIUC    - University of Illinois Urbana Champaign Map and
                               Geography Library
                    Peoria  - United States Department of Agriculture Farm
                               Services Agency in Peoria, Illinois
                    Lake    - Lake County, Illinois Planning Department
                    SIUC    - Southern Illinois University Carbondale
                               Morris Library
    
      CD_ROM - Number indicating CD # out of total # of CD's for a given county
    
      NOTES - Any notes or comments about the aerial photograph
    
      URL - Hyperlink to MrSID file for viewing or downloading image
    
    Entity_and_Attribute_Detail_Citation: none


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?

     Funding source:   United States Army Corps of Engineers (USACE)
     Funding source:   Institute of Museum and Library Sciences (IMLS)
     Data automation:  Deette Lund, Sheena Beaverson
     GIS processing:   Robert White, Deette Lund, Tim Coulombe
     Documentation:    Deette Lund, Ray Peterlin, Andrew Baker, Tim Coulombe
     QA/QC:            Deette Lund, Sheena Beaverson
    

  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?

This data set was created to assist the user in locating historical aerial photographs which have no spatial reference.


How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 2001 (process 1 of 5)
    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 indexes were scanned at 600 dpi and the line indexes were scanned at 300 dpi (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 indexes were scanned at 300 dpi and the line indexes were scanned at 400 dpi (2004).

    Date: 2003 (process 2 of 5)
    GEOREFERENCING: The scanned images were georeferenced using Erdas Imagine ( Othrobase version 8.5 (2003-2004); LPS version 8.7 (2005-2007); LPS version 9.1 (2008)). The reference base used were United States Geological Survey Digital Raster Graphic (DRG) files , which are available on the Illinois Natural Resources Geospatial Clearinghouse. A minimum of 5 ground control points (GCP's) were selected for each image. The maximum RMSE allowed was 1.0 (5 meters).

    Date: 2003 (process 3 of 5)
    CENTER POINT CREATION: Using a combination of software (ArcView 3.2 and ArcGIS 8.3 (2003-2004); ArcGIS 9.0 (2005-2008)) center point data layer shapefiles were created in ArcView using the georeferenced county indexes for each county. Center points were created for all known aerial photographs listed or shown on the county index sheets, whether or not the photographs were available for scanning.

    Photo center point locations are best approximation.

    Points were established by the following method. Two different methods were employed, one for the photo mosaic indexes and a second for the line indexes.

    Photo mosaic index:

    Example: 20 center points are needed in the flight line.
    1) Place the first point in what would be the approximate center of the first photo in the flight line.
    2) Start adding additional points after the first one, spaced closely together.
    3) When you get to point 19, make certain it is not already beyond the last photo in the flight line on the index sheet.
    4) Place the 20th point on the approximate center of the last photo in the flight line.
    5) Use the alignment tool and evenly distribute the points between the two end points.
    6) Use the rotation tool and adjust the entire flight line as needed, so that the center points for each of the photos are still situated at the approximate center of their respective photo locations.
    7) Repeat steps 1-6 for each flight line.
    
    Line index:
    Example: 20 center points are needed in the flight line.
    1) Place the first point on the center of the annotation for the first photo in the flight line.
    2) Start adding additional points after the first one, spaced closely together.
    3) When you get to point 19, make certain it is not already beyond the last annotated photo in the flight line on the index sheet.
    4) Place the 20th point at the approximate center of the annotation for the last photo in the flight line.
    5) Use the alignment tool and evenly distribute the points between the two end points.
    6) Use the rotation tool and adjust the entire flight line as needed, so that the center points for each of the photos are still located at the approximate center of their respective annotations.
    7) Repeat steps 1-6 for each flight line.
    

    Date: 2003 (process 4 of 5)
    ADD ATTRIBUTES: Import supplemental information about each photograph into the appropriate record entry in the associated .dbf file.

    Date: 2003 (process 5 of 5)
    ADD PROJECTION INFORMATION: Define the projection of the shapefile.

  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: Schematic County Indexes: Illinois State Geological Survey, Champaign, Illinois.

    Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: Photo Mosaic 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?

    Center point locations are approximate.

  2. How accurate are the geographic locations?

    Center point locations are approximate.

  3. How accurate are the heights or depths?

    Not applicable.

  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 county shapefile 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 the metadata for this data set. 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