EarthWorks Geospatial Catalog

Philadelphia, PA (Aerial Imagery, 1981-1984)

Description
The historical images consist of digital scans from original aerial photography film located at the Aerial Photography Field Office (APFO). The film is in a 9"x9" format and scanned to encompass the entire exposure or full frame to include fiducial marks required for georeferencing. The aerial imagery was mainly used to assist the Farm Service Agency (FSA) in administering federal farm programs and is now used by the private and public sector for a variety of purposes including but not limited to historical change detection, legal proceedings, and environmental assessments. The film is public domain and reproductions can be acquired by the government and private sectors including the general public. The scanned imagery was produced using either LH Systems DSW500 or Wehrli Associates RM-6 photogrammetric scanners output to a raw tif format. Geotiff files were created using ESRI ArcMap software. Supporting files may include photo frame shapefiles, centroid text files, and metadata.
Publisher
U.S. Department of Agriculture (USDA)
Year
1981
Held by
MIT
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