Identification_Information:
  Citation:
    Citation_Information:
      Originator: Illinois State Geological Survey
      Publication_Date: Unpublished Material
      Title: Illinois Historical Aerial Photographs: County Index Data v.2
      Edition: Version 2 (2006)
      Geospatial_Data_Presentation_Form: vector digital data
  Description:
    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.
    Purpose: This data set was created to assist the user in locating historical aerial photographs which have no spatial reference.
    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.
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 1936
        Ending_Date: 1941
    Currentness_Reference: publication date
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -91.675280
      East_Bounding_Coordinate: -87.483350
      North_Bounding_Coordinate: 42.564692
      South_Bounding_Coordinate: 36.911398
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: none
      Theme_Keyword: aerial
      Theme_Keyword: photography
      Theme_Keyword: historical
      Theme_Keyword: black and white
      Theme_Keyword: shapefile
      Theme_Keyword: navigation
    Place:
      Place_Keyword_Thesaurus: none
      Place_Keyword: Illinois
      Place_Keyword: county
      Place_Keyword: Midwest
      Place_Keyword: Metro Area
      Place_Keyword: Great Lakes
      Place_Keyword: Champaign
      Place_Keyword: Chicago
      Place_Keyword: Peoria
      Place_Keyword: Rockford
      Place_Keyword: St. Louis
      Place_Keyword: Springfield
      Place_Keyword: Shawnee National Forest
    Temporal:
      Temporal_Keyword_Thesaurus: none
      Temporal_Keyword: pre-WWII
      Temporal_Keyword: pre-World War II
      Temporal_Keyword: WWII
      Temporal_Keyword: World War II
      Temporal_Keyword: 1936 to 1941
      Temporal_Keyword: 1936
      Temporal_Keyword: 1937
      Temporal_Keyword: 1938
      Temporal_Keyword: 1939
      Temporal_Keyword: 1940
      Temporal_Keyword: 1941
      Temporal_Keyword: 1930s
      Temporal_Keyword: 1940s
      Temporal_Keyword: Great Depression
      Temporal_Keyword: Dust Bowl
  Access_Constraints: none
  Use_Constraints:
    Reproduction or redistribution of copyrighted digital data sets or products derived there from outside of licensee organization or entity is expressly forbidden.  The only exception is redistribution to consultants working for the licensee, and then only for purposes, related to work for the licensee.  Such consultants may not further reproduce or redistribute these data sets.  None of these data shall be electronically duplicated on magnetic or optical media for use by others, in whole or in part, without permission of the appropriate custodial division within the Illinois Department of Natural Resources (IDNR).

    Any hardcopies utilizing IDNR data sets shall clearly indicate their source.  If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map.  Licensee specifically agrees not to misrepresent IDNR data sets, nor to imply that changes they made were approved by IDNR.

    These data are not to be used for commercial profit.
  Point_of_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Illinois State Geological Survey
      Contact_Position: Information Office
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 615 East Peabody Drive
        City: Champaign
        State_or_Province: Illinois
        Postal_Code: 61820
        Country: USA
      Contact_Voice_Telephone: 217-333-4747
      Contact_TDD/TTY_Telephone: 217-785-0211
      Contact_Facsimile_Telephone: 217-244-0802
      Contact_Electronic_Mail_Address: isgs@isgs.uiuc.edu
      Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
  Data_Set_Credit:
    > 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
  Native_Data_Set_Environment:
    PROJECT YEARS 2001-2005:
    Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4
    PROJECT YEARS 2005-2006:
    Microsoft Windows XP Professional Version 2002 Service Pack 2
  Cross_Reference:
    Citation_Information:
      Originator: Illinois State Geological Survey
      Publication_Date: Unpublished Material
      Title: Illinois Historical Aerial Photographs: 1936 to 1941
      Geospatial_Data_Presentation_Form: raster digital data
      Publication_Information:
        Publication_Place: Champaign, Illinois
        Publisher: Illinois State Geological Survey
      Online_Linkage: <URL:ilhap_gen.html>
  Cross_Reference:
    Citation_Information:
      Originator: Illinois State Geological Survey
      Publication_Date: Unpublished Material
      Title: Illinois Historical Aerial Photographs: Schematic County Indexes
      Geospatial_Data_Presentation_Form: raster digital data
      Publication_Information:
        Publication_Place: Champaign, Illinois
        Publisher: Illinois State Geological Survey
      Online_Linkage: <URL:l_index.html>
  Cross_Reference:
    Citation_Information:
      Originator: Illinois State Geological Survey
      Publication_Date: Unpublished Material
      Title: Illinois Historical Aerial Photographs: Photo Mosaic County Indexes
      Geospatial_Data_Presentation_Form: raster digital data
      Publication_Information:
        Publication_Place: Champaign, Illinois
        Publisher: Illinois State Geological Survey
      Online_Linkage: <URL:p_index.html>
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: Center point locations are approximate.
  Logical_Consistency_Report: Not Applicable
  Completeness_Report: Not Applicable
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: Center point locations are approximate.
    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report: Not applicable.
  Lineage:
    Process_Step:
      Process_Description:
        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).
      Process_Date: 2001-2003 & 2004
    Process_Step:
      Process_Description:
        GEOREFERENCING:
        The scanned images were georeferenced using Erdas Imagine (version 8.5 (2003-2004); version 8.7 (2005-2006)). 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).
      Process_Date: 2003 to 2006
    Process_Step:
      Process_Description:
        CENTER POINT CREATION:
        Using a combination of software (ArcView 3.2 and ArcGIS 8.3 (2003-2004); ArcGIS 9.0 (2005-2006)) 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.
      Process_Date: 2003 to 2006
    Process_Step:
      Process_Description:
        ADD ATTRIBUTES:
        Import supplemental information about each photograph into the appropriate record entry in the associated .dbf file.
      Process_Date: 2003-2006
    Process_Step:
      Process_Description:
        ADD PROJECTION INFORMATION:
        Define the projection of the shapefile.
      Process_Date: 2003 - 2006
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: Entity point
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Geographic:
      Latitude_Resolution: 0.000001
      Longitude_Resolution: 0.000001
      Geographic_Coordinate_Units: Decimal degrees
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1983
      Ellipsoid_Name: Geodetic Reference System 80
      Semi-major_Axis: 6378137.000000
      Denominator_of_Flattening_Ratio: 298.257222
Entity_and_Attribute_Information:
  Overview_Description:
    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
      >                OWR     - IDNR Office of Water Resources Collection
      >                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
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Illinois State Geological Survey
      Contact_Position: Information Office
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 615 East Peabody Drive
        City: Champaign
        State_or_Province: Illinois
        Postal_Code: 61820
        Country: USA
      Contact_Voice_Telephone: 217-333-4747
      Contact_TDD/TTY_Telephone: 217-785-0211
      Contact_Facsimile_Telephone: 217-244-0802
      Contact_Electronic_Mail_Address: isgs@isgs.uiuc.edu
      Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
  Resource_Description: 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.
  Distribution_Liability:
    The Illinois Department of Natural Resources provides these geographic data "as is."  IDNR makes no guarantee or warranty concerning the accuracy of information contained in the geographic data.  IDNR further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user.  Although these data have been processed successfully on computers of IDNR, no warranty, expressed or implied, is made by IDNR regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.

    In no event shall the IDNR have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by IDNR.
Metadata_Reference_Information:
  Metadata_Date: 20060811
  Metadata_Review_Date: 20060811
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Illinois State Geological Survey
      Contact_Position: Information Office
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 615 East Peabody Drive
        City: Champaign
        State_or_Province: Illinois
        Postal_Code: 61820
        Country: USA
      Contact_Voice_Telephone: 217-333-4747
      Contact_TDD/TTY_Telephone: 217-785-0211
      Contact_Facsimile_Telephone: 217-244-0802
      Contact_Electronic_Mail_Address: isgs@isgs.uiuc.edu
      Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: local time
  Metadata_Access_Constraints: none
  Metadata_Use_Constraints: none