Identification_Information: Citation: Citation_Information: Originator: Illinois State Geological Survey Publication_Date: Unpublished Material Title: Illinois Historical Aerial Photographs: Schematic County Indexes v.4 Edition: Version 4 (2008) Geospatial_Data_Presentation_Form: raster digital data Online_Linkage: http://www.isgs.illinois.edu/ Online_Linkage: http://illinois.edu Description: Abstract: This data set consists of schematic or line drawn indexes of Illinois historical black and white aerial photographs, acquired during the late 1930s and early 1940s. The original paper 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 15:1 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. Purpose: These data are provided as supplemental imagery to aid in understanding the organization of the historical aerial photograph collections. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1936 Ending_Date: 1941 Currentness_Reference: publication date Status: Progress: In work 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: scanned Theme_Keyword: MrSID Theme_Keyword: TIFF Theme_Keyword: dpi Theme_Keyword: line drawn index Theme_Keyword: schematic Place: Place_Keyword_Thesaurus: none Place_Keyword: Illinois Place_Keyword: county Place_Keyword: Midwest Place_Keyword: Metro Area Place_Keyword: Great Lakes Temporal: Temporal_Keyword_Thesaurus: none Temporal_Keyword: 1930s Temporal_Keyword: 1940s 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: Great Depression Temporal_Keyword: Dust Bowl 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. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Deette Lund Contact_Organization: Illinois State Geological Survey Contact_Position: Assistant Supportive Scientist 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: 217-265-5642 Contact_TDD/TTY_Telephone: 217-785-0211 Contact_Facsimile_Telephone: 217-244-2785 Contact_Electronic_Mail_Address: 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. Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4 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 Cross_Reference: Citation_Information: Originator: Illinois State Geological Survey Publication_Date: Unpublished Material Title: Illinois Historical Aerial Photographs: County Index Data Layer Geospatial_Data_Presentation_Form: vector digital data Publication_Information: Publication_Place: Champaign, Illinois Publisher: Illinois State Geological Survey 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 Cross_Reference: Citation_Information: Title: ISGS Terms of Use Online_Linkage: http://www.isgs.illinois.edu Cross_Reference: Citation_Information: Title: University of Illinois Web Privacy Notice Online_Linkage: http://www.vpaa.uillinois.edu/policies/web_privacy.cfm Cross_Reference: Citation_Information: Title: University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4) Online_Linkage: http://www.uillinois.edu/trustees/rules.cfm#sec34 Cross_Reference: Citation_Information: Title: Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign Online_Linkage: http://www.fs.uiuc.edu/cam/CAM/viii/viii-1.1.html Data_Quality_Information: Logical_Consistency_Report: Not Applicable Completeness_Report: Not Applicable Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: These data have not been geometrically corrected. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: These data have not been orthorectified. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: unknown Publication_Date: Unpublished Material Title: Illinois Historical Aerial Photograph Schematic County Indexes Geospatial_Data_Presentation_Form: raster digital data Publication_Information: Publication_Place: Champaign, Illinois Publisher: UIUC Map and Geography Library Source_Scale_Denominator: varies Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1936 Ending_Date: 1941 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Not Applicable Source_Contribution: Not Applicable 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 schematic (line drawn) indexes were scanned at 300 dpi as a grayscale image (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 schematic (line drawn) indexes were scanned at 400 dpi as a bitmap image (2004). Process_Date: 2001-2003 & 2004 Process_Step: Process_Description: IMAGE MANIPULATION: The schematic (line drawn) indexes at the UIUC Map and Geography Library are individually stored in clear archival plastic sleeves within map storage cabinets. Due to space issues many of the schematic indexes have been separated along old fold lines into 2 sheets before they were sealed in the archival plastic sleeves. This allows the sheets to be stored flat in the map storage cabinets without any folds. After the sheets have been scanned they are pieced back together using Adobe Photoshop. Once the schematic index is one sheet again it is ready for compression. The Winnebago County schematic index was changed to a grayscale image and downsampled to 150 dpi using Adobe Photoshop. Process_Date: 2003-2007 Process_Step: Process_Description: IMAGE COMPRESSION (2003-2004): This methodology was employed for 31 counties with schematic (line drawn) indexes that were scanned at ISGS. These counties include Adams, Clark, Clinton, Cumberland, DuPage, Fulton, Greene, Hancock, Jersey, Kane, Kankakee, Kendall, Lake, Madison, Marshall, Mason, McHenry, Monroe, Morgan, Peoria, Pike, Pulaski, Putnam, St. Clair, Sangamon, Schuyler, Scott, Stark, Tazewell, Washington and Woodford 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 15:1. Process_Date: 2003-2004 Process_Step: Process_Description: IMAGE COMPRESSION (2006-2007): This methodology was employed for 4 counties with schematic (line drawn) indexes that were scanned at the UIUC Map and Geography Library by HIG. These counties include DeWitt, Massac, Menard and Winnebago Counties. Copies 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. Process_Date: 2006-2007 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Local: Local_Description: These data are not geometrically corrected. Local_Georeference_Information: Not Applicable Geodetic_Model: Horizontal_Datum_Name: none Ellipsoid_Name: none Semi-major_Axis: none Denominator_of_Flattening_Ratio: none Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Not Applicable Entity_and_Attribute_Detail_Citation: Not Applicable Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois Contact_Position: Clearinghouse Administrator 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: 217-244-9306 Contact_TDD/TTY_Telephone: 217-785-0211 Contact_Facsimile_Telephone: 217-333-3830 Contact_Electronic_Mail_Address: 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. Resource_Description: 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. Distribution_Liability: 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. Metadata_Reference_Information: Metadata_Date: 20090416 Metadata_Review_Date: 20090416 Metadata_Future_Review_Date: 2009 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Illinois State Geological Survey Contact_Person: Deette Lund Contact_Position: Assistant Supportive Scientist 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: 217-265-5642 Contact_TDD/TTY_Telephone: 217-785-0211 Contact_Facsimile_Telephone: 217-244-2785 Contact_Electronic_Mail_Address: 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_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Access_Constraints: The access constraints as stated for the data apply also to the metadata. Refer to the Access Constraints section of the Identification Information section. Metadata_Use_Constraints: The use constraints as stated for the data apply also to the metadata. Refer to the Use Constraints section of the Identification Information section.