Index data layers for each county are also offered in ESRI Shapefile format on the Web Pages listed above. The majority of counties are depicted on one index sheet, but some counties are divided into multiple sheets. These indexes can be difficult to interpret. Compressed digital versions of these indexes are available for download or viewing on the Web Pages listed above. These indexes are either hand-drawn representations of approximate print locations (line index), or photograph-mosaics of the prints flown for a single county (photo index). Reference indexes for each county are housed at the University of Illinois Map and Geography Library. Prints that are unavailable within a county boundary were missing from all known photograph collections at the time of scanning. Prints located well outside the county boundary were not scanned refer to the adjacent county to obtain photographs of the subject area. Links for each scanned print are displayed in the county tables by exposure number the shape of the county will be distorted in the flight line direction. Identical exposure numbers occur within a table because exposures are further classified in the file name by roll number. Flight lines for each county are oriented either west to east or north to south. Individual prints are organized in tables by county table cells containing the files which best delineate the county boundary are highlighted in light blue. Please select the file format you would like to browse for each county collection. Access Illinois Historical Aerial Photography by Countyĭigital versions of ILHAP photographic paper prints are available as full resolution or compressed files.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |