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Hamer Center for Maps and Geospatial Information Penn State University Libraries 814-863-0094 1 Pattee Library University Park PA 16802 US ul-maps@lists.psu.edu 20250609 ArcGIS Metadata 1.0 Orthomosaic of Rock Springs 1985 2025-05-27 Donald W. Hamer Center for Maps and Geospatial Information, Penn State University Libraries vector digital data <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Historic aerial photography seamless mosaics were generated by staff of the Donald W. Hamer Center for Maps and Geospatial Information (https://libraries.psu.edu/maps) using a structure-from-motion photogrammetry workflow as implemented in either Agisoft Metashape Professional or ESRI ArcGIS Pro’s Orthoimagery toolbar with a goal to produce a mosaic of at least 10-meter horizontal positional accuracy that was free of seamline errors and other common image distortions. For collections that were originally flown with calibrated metric cameras with known camera calibration information, this was used in the interior orientation or alignment step of the photogrammetry workflow and as an initial estimate for self-calibrated camera parameters. Where camera calibration information was unknown or never existed (non-metric cameras), camera parameters were estimated by the software with an approximate focal length starting estimate of 152mm. To achieve the horizontal positional accuracy goal, three-dimensional ground control points of high accuracy were added to the project until the root mean squared alignment error as checked by 30-40 independent test points measured less than 10-meters as described by ASPRS Positional Accuracy Standards for Digital Geospatial Data 2024. </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>If the user’s project requires a specific horizontal or vertical positional accuracy, we encourage you to perform an independent accuracy assessment of the orthomosaics and/or contact us about producing an orthomosaic of higher positional accuracy. Also note that horizontal positional accuracy will always decrease near the edges of an orthomosaic. We chose to include edge areas of orthomosaics rather than crop them because the image edges may contain important information for a given project. Note that the original images will cover a somewhat larger area than the orthomosaics as a result of the photogrammetry workflow. </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>For more information on the methods used to generate orthomosaics and/or to cite this work please see the below 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. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>These historic aerial photographs were captured in Spring 1985. These 47 photos were given to the Donald W. Hamer Center for Maps and Geospatial Information by the Penn State Office of the Physical Plant in 2017. Rock Springs 1985 is a portion of the Penn State University Commonwealth and University Park Campuses 1985-1986 Aerial Photos collection. The original contractor for this collection was Eastern Mapping Co.</SPAN></P></DIV></DIV></DIV> Orthomosaic of Rock Springs 1985 Donald W. Hamer Center for Maps and Geospatial Information Penn State University Libraries 814-863-0094 1 Pattee Library University Park PA 16802 US ul-maps@lists.psu.edu Pennsylvania Spatial Data Access The Pennsylvania State University The Pennsylvania Geospatial Data Clearinghouse 814-863-0104 115 Land and Water Building University Park PA 16802 US pasda@psu.edu ISO 19115 Topic Categories imageryBaseMapsEarthCover imageryBaseMapsEarthCover digital image map aerial photograph imageryBaseMapsEarthCover digital image map aerial photograph <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>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.</SPAN></P></DIV></DIV></DIV> Esri ArcGIS 13.0.0.36056 1985 1985-04-21 1 -77.990134 -77.910125 40.735959 40.686051 47 2 1 0 754341.557990 4508492.490127 754341.557990 4513811.490127 760924.557990 4513811.490127 760924.557990 4508492.490127 757633.057990 4511151.990127 6583 1.000000 5319 1.000000 Orthomosaic of Rock Springs 1985 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 Raster Dataset dataset EPSG 9.8.8(3.0.1) Band_1 65535.000000 0.000000 16