Identification number (ID) in its upper right corner as illustrated in the figure on the right (click to enlarge the image). A concise discussion of the uses of aerial photos can beĮvery historical aerial photograph has a unique Of these black-and-white photos exist in archives of the Indiana Geological Survey, the Indiana State Archives, and various librariesĪnd governmental agencies. The scale of the photos is approximately 1:21,000 and, for reference, a scale bar of 1 mile has been superimposed on this example.īeginning in the 1930s, aerial surveys of Indiana counties were conducted about every 10 years between the 1930s and theġ970s, more than 100,000 aerial photos of the state were taken. Also please read the instructions page to better understand the tools available on the interactive map, and the suggested methods of discovering IDs for photos that show a particular area of interest. Copies of the photos can then be ordered from various archival collections, including the IGWS archive.īefore attempting to use the IHAPI map, we strongly recommend that users read the Archival Organization to better understand the way archives captured the imagery and then organized and indexed the large numbers of paper copies of images that comprise a survey for any given county. IHAPI allows users to easily locate a site of interest and determine unique identification numbers for individual photos on all index maps for a given area of interest. In the past, anyone interested in using historical aerial photos would have to physically visit an archival collection, and use the paper copies of index maps to locate an area of interest and find the photo ID. Historical Aerial Photo Index" (IHAPI) interactive map to facilitate the identification and retrieval of historical aerial photographs. The Indiana Geological and Water Survey (IGWS) has created the "Indiana Indiana Geologic Names Information System Underground Coal Gasification Potential in the Illinois Basin Landmarks in Indiana Geology - A Timeline
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