Donald W. Hamer Center for Maps and Geospatial Information, Penn State University Libraries 20250124 vector digital data This collection of historic aerial photographs contains two missions taken in 1977 and 1978, respectively. The 1977 mission was captured by L. Robert Kimball, Consulting Engineers, Ebensburg, Pennsylvania at 1”=500’ scale and contains 331 photos. The 1978 mission was captured on October 31st, 1978 at a scale of 1:24,000 and contains 84 photos. This collection was given to the Donald W. Hamer Center for Maps and Geospatial Information by the PA Department of Conservation and Natural Resources, Bureau of Geological Survey Library. The photos were scanned at 800 dpi on an Epson Expression 11000 scanner by the Donald W. Hamer Center for Maps and Geospatial Information. Approximate historic aerial photo center points were generated by staff of the Donald W. Hamer Center for Maps and Geospatial Information (https://libraries.psu.edu/maps). Photos were aligned and georeferenced in three dimensions using Agisoft Metashape 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 as a center point index to the historic aerial photography collection. This center point index is intended to facilitate discovery and access, but not for research purposes. Where photography collections facilitated the generation of high-quality seamless mosaics, these were produced to common research standards and made available along with center point indexes. Please use orthomosaics for measurement, comparison with imagery of other time-periods and other common tasks performed in a geographic information system (GIS). For more information on the methods used to generate center point indexes, orthomosaics, and/or to cite this work please see the following reference: Nathan B. Piekielek, Grace Brittany Waltemate and Karen Schuckman (2022) Evaluating Software Tools to Orthorectify Archival Aerial Photographs, Journal of Map and Geography Libraries, 18:3, 209-229, DOI: 10.1080/15420353.2023.2219257 Not Georeferenced. Historic aerial photographs of Pennsylvania. 19770101 19781031 1977-1978 Complete None planned -79.052513 -78.646932 40.498600 40.144361 ISO 19115 Topic Categories imageryBaseMapsEarthCover None imageryBaseMapsEarthCover digital image map aerial photograph imageryBaseMapsEarthCover None The User shall save the Commonwealth harmless from any suits, claims or actions arising out of the use of the data files or accompanying documentation, or arising out of any defect in the data files or accompanying documentation. The Commonwealth excludes any and all implied warranties and makes no warranty or representation with respect to the data files or accompanying documentation, including quality, performance, merchantability, and fitness for a particular purpose. These data files and documentation are provided AS IS and the User assumes the entire risk as to their quality and performance. Those parties involved with the development and distribution of this data will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation. Penn State University Libraries Donald W. Hamer Center for Maps and Geospatial Information mailing and physical

1 Pattee Library

University Park PA 16802 US 814-863-0094 ul-maps@lists.psu.edu The Pennsylvania State University Pennsylvania Spatial Data Access The Pennsylvania Geospatial Data Clearinghouse mailing and physical

115 Land and Water Building

University Park PA 16802 US 814-863-0104 pasda@psu.edu Esri ArcGIS 13.4.0.55405 Vector Entity point 376 Aerial Photographs of Johnstown 1977-1978 FID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. Roll Exp Frame Year Date FileName URL Collection Location Resolution X Y Focal Altitude GSD 20250609 Penn State University Libraries Donald W. Hamer Center for Maps and Geospatial Information mailing and physical

1 Pattee Library

University Park PA 16802 US 814-863-0094 ul-maps@lists.psu.edu FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time