Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: County Index Data v.2.
This is a Vector data set. It contains the following vector data types (SDTS terminology):
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.
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
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
217-333-4747 (voice)
217-244-0802 (FAX)
isgs@isgs.uiuc.edu
This data set was created to assist the user in locating historical aerial photographs which have no spatial reference.
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).
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.
Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: 1936 to 1941: Illinois State Geological Survey, Champaign, Illinois.Online Links:
Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: Schematic County Indexes: Illinois State Geological Survey, Champaign, Illinois.Online Links:
Illinois State Geological Survey, Unpublished Material, Illinois Historical Aerial Photographs: Photo Mosaic County Indexes: Illinois State Geological Survey, Champaign, Illinois.Online Links:
Center point locations are approximate.
Center point locations are approximate.
Not applicable.
Not Applicable
Not Applicable
Are there legal restrictions on access or use of the data?
- 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.
217-333-4747 (voice)
217-244-0802 (FAX)
isgs@isgs.uiuc.edu
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.
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.
217-333-4747 (voice)
217-244-0802 (FAX)
isgs@isgs.uiuc.edu
Illinois Natural Resources Geospatial Data Clearinghouse
Generated by mp version 2.8.11 on Mon Jan 29 15:19:37 2007