Delaware Valley Regional Planning Commission
Multi-spectral digital orthophotography was produced at a scale of 1:2400 (1 in = 200 ft) with a 12 inch pixel resolution for the DVRPC – PA project area. Digital orthophotography combines the image characteristics of a photograph with the geometric qualities of a map. Orthophoto data is produced through the use of digitized perspective aerial photographs or other remotely sensed image data. This data is processed into a digital product that has been rectified for camera lens distortion, vertical displacement caused by terrain relief, and variations in aircraft altitude and orientation. Acquisition information, processing, accuracies, etc. apply only to the data collected under Task Order G15PD00279. The information reported does not include imagery acquired and produced by the US Army Corps of Engineers (USACE) and AXIS Geospatial. However, tile counts and boundary coordinates include the USACE imagery. This dataset consists of uncompressed, ortho photo tiles formatted as 16-bit, 4-band (RGB and NIR) GeoTIFF images with TIF world files. A total of 1,540 tiles were produced in PA State Plane South Zone, US Survey feet; tile size is 8,745 ft x 5,022 ft and uses the DVRPC PA index.
The Microsoft UltraCam Falcon and Eagle large format digital camera was used to capture 4-band (RGB and NIR), 16-bit imagery at a Nominal Acquisition Altitude of 16,480′ (AGL) during the Spring of 2015 on the following flight dates: Apr 2, 2015-A (N170TA; 50811038), Apr 2, 2015-A (N344Q; 40312131) and Apr 18, 2015-A (N170TA; 50811038)
U.S. Geological Survey (USGS)
Pennsylvania Spatial Data Access (PASDA)
Delaware Valley Regional Planning Commission (DVRPC)
Horizontal Positional Accuracy
Please see the Accuracy Analyst report for a detailed report showing the 57 control points measured to produce the NSSDA value of 0.737 meters.
None. However, users should be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from these data.
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.
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