Quantum Spatial, Inc. 20210120 remote-sensing image Product: This orthoimagery data set includes 0.5 foot 8-bit 4-band (RGBN) digital orthoimage mosaics in MrSID format (25:1 compression). Geographic Extent: 1 county in Pennsylvania, covering approximately 1337 total square miles. Dataset Description: The PEMA 2018 0.5-Foot Orthoimagery - Bradford County Delivery (US Survey Feet) project called for the planning, acquisition, processing, and derivative products of imagery data to be collected at a ground sample distance (GSD) of 0.5 foot. Project specifications are based on the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. The data were developed based on a horizontal projection/datum of NAD 1983 HARN StatePlane Pennsylvania North FIPS 3701 Feet, Foot US. Orthoimagery data were delivered as 8-bit 4-band (RGBN) MrSID mosaics (25:1 compression). Ground Conditions: Imagery was collected in fall 2019 and spring 2019, while no snow was on the ground and rivers were at or below normal levels. In order to post process the imagery data to meet task order specifications and meet ASPRS horizontal accuracy guidelines, Quantum Spatial, Inc. utilized a total of 496 ground control points to assess the horizontal accuracy of the data. These data depict geographic features on the surface of the earth. The dataset was created to current imagery data for Pennsylvania. 20191106 20200322 Ground condition Complete None planned -76.9409251648 -76.0883420521 42.0300840934 41.5271747457 2190000.00014 2420000.00012 679999.999444 499999.999537 None 0.5 foot orthoimage MrSID rectified photograph rectified image orthophoto natural color orthophoto orthoimage image map None Pennsylvania Bradford County No restrictions apply to these data. None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the organization providing these data to the public would be appreciated for products derived from these data. Quantum Spatial, Inc. Windows 10.1; Esri ArcGIS 10.3.1; ImageStation Orientation 2015/Version 15.00.0000 Build 395; Leica MissionPro version 11.6 ; OrthoPro v.06.02.0100.00017 Radiometry is verified by visual inspection of the digital orthophoto. Slight systematic radiometric differences may exist between adjacent orthoimage files; these are due primarily to differences in source image capture dates and sun angles along flight lines. These differences can be observed in an image's general lightness or darkness when it is compared to adjacent orthoimage file coverages. Tonal balancing may be performed over a group of images during the mosaicking process which may serve to lighten or darken adjacent images for better color tone matching. All GeoTIFF tagged data and image file sizes are validated using commercial GIS software to ensure proper loading before being archived. This validation procedure ensures correct physical format and field values for tagged elements. Seamlines and tile edges are visually inspected. Seamline mismatches are corrected unless the overall displacement is less than one pixel. Orthoimages are visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images. These images are derived by mosaicking multiple images to ensure complete coverage. Source imagery is cloud free. Quantum Spatial, Inc. 20210120 vector digital data and tabular data online 2018 ground condition CONTROL Quantum Spatial performed a geodetic control survey in support of the digital orthophoto production project. A total of 496 points were used for QC testing. Please see the survey report for more information. Quantum Spatial, Inc. 20210120 remote-sensing image external hard drive 20191106 20200322 ground condition PHOTO Aerial imagery was acquired using a DMC III camera with a flight design that included a total of 30 flight lines. Aerial imagery was supplemented with the simultaneous acquisition of airborne GPS/IMU data, which captured the ground coordinate for the nadir point of each photograph. Aerial imagery was exposed at an altitude of 6600 feet above mean terrain. Quantum Spatial, Inc. 20210120 model online 2020 ground condition AT Softcopy aerotriangulation was performed utilizing the airborne GPS/IMU data, GPS ground control and image coordinate measurements allowing the direct computation of the exterior orientation parameters for each image of the project. Quantum Spatial, Inc. 20210120 raster digital data online 2019 publication date DEM A compilation of topographic land form elevation datasets developed using in-house LiDAR data and data from the National Elevation Dataset for use in developing digital ortho imagery. Orthophoto Processing: Utilizing all four bands [blue (B), green (G), red (R), and infrared (IR)] digital orthorectification was performed using bilinear interpolation algorithms resulting in a spatial and radiometric transformation of the digital image from line/sample space into NAD 1983 HARN StatePlane Pennsylvania North FIPS 3701 Feet, Foot US. The interior and exterior orientation parameters from the aerotriangulation process were used to project each pixel into the ground coordinate system, while the ortho grade DEM was used to correct for relief displacement. Radiometric correction software and techniques were used to create orthophoto files that minimize the appearance of image seams and without loss of feature signature. Orthophotos are checked for geometric accuracy, image quality, and are tonally balanced to produce a uniform contrast and tone across the entire project. The individual overlapping orthophoto frames were mosaicked together. The ortho photos meet ASPRS horizontal accuracy standards. Georefs AT Control DEM 20210120 Orthos Raster State Plane Coordinate System 1983 3701 40.8833333333 41.95 -77 40.1666666667 1968500 0.0 row and column 0.5 0.5 Foot US D North American 1983 HARN Geodetic Reference System 80 6378137.0 298.257222101 Three band orthoimagery is organized in three color bands or channels which represent the red, green, and blue (RGB) portions of the spectrum. Four band orthoimagery is organized in four color bands or channels which represent the red, green, blue (RGB), and near infrared (IR) portions of the spectrum. Each image pixel is assigned a triplet or quadruplet of numeric values, one for each color band. Numeric values range from 0 to 255. U.S. Department of the Interior, U.S. Geological Survey, 1996, Standards for Digital Orthophotos: Reston, VA. 20210120 Quantum Spatial, Inc. mailing and physical

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University ParkPennsylvania16802United States(814) 865 - 8792pasda@psu.eduThe 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