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Donald W. Hamer Center for Maps and Geospatial Information
Penn State University
+1 (814)-863-0094
1 Central Pattee Library
University Park
PA
16802
US
ul-maps@lists.psu.edu
https://libraries.psu.edu/monthly-hours?library=103
Central Pattee Lower Level
20250609
ArcGIS Metadata
1.0
Orthomosaic of Cambria County 2001
2022-12-08
Donald W. Hamer Center for Maps and Geospatial Information, Penn State University
vector digital data
<DIV STYLE="text-align:Left;"><DIV><DIV><P><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></P><P><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></P><P><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><SPAN>These historic aerial photographs were taken by L. Robert Kimball, Consulting Engineers, Ebensburg, Pennsylvania at a scale of 1”=2000’. There are 403 photos in this mission, and they were taken on April 25th and 26th, 2001. This mission is part of the Cambria County PA 2001 Aerial Photos collection. The collection was given to the Donald W. Hamer Center for Maps and Geospatial Information in 2017. The photos were scanned at 800 dpi on an Epson Expression 11000 scanner by the Donald W. Hamer Center for Maps and Geospatial Information. </SPAN></P></DIV></DIV></DIV>
Orthomosaic of Cambria County 2001
Donald W. Hamer Center for Maps and Geospatial Information
Penn State University
+1 (814)-863-0094
1 Central Pattee Library
University Park
PA
16802
US
ul-maps@lists.psu.edu
https://libraries.psu.edu/monthly-hours?library=103
Central Pattee Lower Level
Pennsylvania Spatial Data Access (PASDA)
The Penn State University
The Pennsylvania Geospatial Data Clearinghouse
814-863-0104
814-865-3378
115 Land and Water Building
University Park
PA
16802
US
pasda@psu.edu
imageryBaseMapsEarthCover
digital image map, aerial photograph
ISO 19115 Topic Categories
imageryBaseMapsEarthCover
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>
The USER shall indemnify, save harmless, and, if requested, defend those parties involved with the development and distribution of this data, their officers, agents, and employees from and against any suits, claims, or actions for injury, death, or property damage arising out of the use of or any defect in the FILES or any accompanying documentation. Those parties involved with the development and distribution excluded any and all implied warranties, including warranties or merchantability and fitness for a particular purpose and makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its 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.
Esri ArcGIS 13.0.0.36056
2001
2001-04-25T00:00:00
2001-04-26T00:00:00
1
-79.091166
-78.332950
40.782826
40.180280
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.
Dates recorded from aerial image index and scanned image. Filename calculated from attribute fields to correspond with matching format of file name.
2022-12-08
403
2
1
0
662478.809596 4451118.971247
662478.809596 4516432.889847
725099.566616 4516432.889847
725099.566616 4451118.971247
693789.188106 4483775.930547
62617
1.000060
65310
1.000060
Orthomosaic of Cambria County 2001
Table
61459
OID
OID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Value
Value
Integer
10
10
0
Count
Count
Double
19
0
0
Raster Dataset
dataset
EPSG
9.8.8(3.0.1)
Band_1
65535.000000
1640.000000
16