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To generate approximate historic aerial photo center points – photos were aligned and georeferenced in three dimensions using Agisoft Metashape and using a minimum number of ground control points, typically between 5 and 12 depending on the size of the project. Estimates of each camera pose, including geographic coordinates, were then exported to create a digital index for the collection. This digital index is intended to facilitate discovery and access, but not for research purposes. These aerial images were obtained from 9"x9" film roll. The film was gifted to the Donald W. Hamer Center for Maps and Geospatial Information in 2021. These photos of the Centre Region are at a 1”:9600’ scale. They were captured in April 1949. There are 177 scans at 800dpi. These scans provide partial coverage of Centre County, PA, including the Penn State University Park campus and surrounding towns. |