{
 "culture": "en-US",
 "name": "",
 "guid": "",
 "catalogPath": "",
 "snippet": "United States Department of Agriculture, Agricultural Adjustment Administration (USDA-AAA) aerial photographs are widely recognized as a unique and detailed record of the cultural and physical landscapes of Illinois. USDA-AAA photography is intensively used for diverse purposes by government agencies, surveyors, planners, consulting scientists, engineers and other individuals. These purposes include determination of past land uses, restoration of natural areas, assessing historical changes in stream dynamics, and a variety of other applications.\n\nThese data have not been geometrically corrected.",
 "description": "<DIV STYLE=\"text-align:Left;\"><DIV><DIV><P><SPAN>The primary data set consists of historical black and white aerial photographs from Illinois acquired during 1936 to 1941. Alternative years of photography are used for certain counties when a quality set from between 1936 and 1941 cannot be located. The original paper prints have been scanned and stored as TIFF format images. The online images available are MrSID format images in which the original TIFF files have been compressed at a target ratio of 12:1 with the exception of 17 counties. Alexander, Boone, DeWitt, Douglas, Edwards, Gallatin, Hardin, Jackson, JoDaviess, Massac, Menard, Perry, Pope, Randolph, Saline, Williamson and Winnebago Counties were compressed at a target ratio of 6:1. The original photographic paper prints are at a scale 1:20,000.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>",
 "summary": "United States Department of Agriculture, Agricultural Adjustment Administration (USDA-AAA) aerial photographs are widely recognized as a unique and detailed record of the cultural and physical landscapes of Illinois. USDA-AAA photography is intensively used for diverse purposes by government agencies, surveyors, planners, consulting scientists, engineers and other individuals. These purposes include determination of past land uses, restoration of natural areas, assessing historical changes in stream dynamics, and a variety of other applications.\n\nThese data have not been geometrically corrected.",
 "title": "Illinois Historical Aerial Photographs: 1936 to 1941 v.4",
 "tags": [
  "aerial",
  "photography",
  "historical",
  "imagery",
  "black and white",
  "scanned",
  "TIFF",
  "dpi",
  "grayscale",
  "United States Department of Agriculture",
  "Agricultural Adjustment Administration",
  "USDA",
  "AAA",
  "Illinois",
  "county",
  "Will"
 ],
 "type": "",
 "typeKeywords": [],
 "thumbnail": "",
 "url": "",
 "minScale": 625000,
 "maxScale": 5000,
 "spatialReference": "",
 "accessInformation": "Illinois State Geological Survey",
 "licenseInfo": "<DIV STYLE=\"text-align:Left;\"><DIV><DIV><P><SPAN>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.<\/SPAN><\/P><P><SPAN>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.<\/SPAN><\/P><P><SPAN>Links to these are provided in the Cross References section. <\/SPAN><\/P><\/DIV><\/DIV><\/DIV>",
 "portalUrl": ""
}