PEMA 2018 0.5-Foot Orthoimagery - Allegheny County Delivery (US Survey Feet); MrSID Mosaic; Allegheny_1
Identification_Information:
Citation:
Citation_Information:
Originator:Quantum Spatial, Inc.
Publication_Date:20190917
Title:
PEMA 2018 0.5-Foot Orthoimagery - Allegheny County Delivery (US Survey Feet); MrSID Mosaic; Allegheny_1
Geospatial_Data_Presentation_Form:remote-sensing image
Description:
Abstract: 
       Product: This orthoimagery data set includes 0.5 foot 8-bit 4-band (RGBN) digital orthoimage mosaics in MrSID format (1:25 compression).
       Geographic Extent: 1 county in Pennsylvania, covering approximately 889 total square miles. 
       Dataset Description: The PEMA 2018 0.5-Foot Orthoimagery - Allegheny 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 South FIPS 3702 Feet, Foot US. Orthoimagery data were delivered as 8-bit 4-band (RGBN) MrSID mosaics (1:25 compression).
       Ground Conditions: Imagery was collected in winter and spring 2018 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.
Purpose: 
These data depict geographic features on the surface of the earth. The dataset was created to current imagery data for Pennsylvania.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:20180318
Ending_Date:20190427
Currentness_Reference: 
ground condition
Status:
Progress:Complete
Maintenance_and_Update_Frequency:None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-80.3768285971
East_Bounding_Coordinate:-79.6420293219
North_Bounding_Coordinate:40.6902032047
South_Bounding_Coordinate:40.1822352716
Keywords:
Theme:
Theme_Keyword_Thesaurus:None
Theme_Keyword:0.5 foot orthoimage
Theme_Keyword:MrSID
Theme_Keyword:rectified photograph
Theme_Keyword:rectified image
Theme_Keyword:orthophoto
Theme_Keyword:natural color orthophoto
Theme_Keyword:orthoimage
Theme_Keyword:image map
Place:
Place_Keyword_Thesaurus:None
Place_Keyword:Pennsylvania
Place_Keyword:Allegheny County
Access_Constraints:No restrictions apply to these data.
Use_Constraints: 
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.
Data_Set_Credit: 
Quantum Spatial, Inc.
Native_Data_Set_Environment:
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
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: 
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.
Logical_Consistency_Report: 
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.
Completeness_Report: 
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.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:Quantum Spatial, Inc.
Publication_Date:20190917
Title:
GPS Photo Control Survey
Geospatial_Data_Presentation_Form:vector digital data and tabular data
Type_of_Source_Media:online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:2018
Source_Currentness_Reference:
ground condition
Source_Citation_Abbreviation:
CONTROL
Source_Contribution: 
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.
Source_Information:
Source_Citation:
Citation_Information:
Originator:Quantum Spatial, Inc.
Publication_Date:20190917
Title:
Georeferenced Single Frames
Geospatial_Data_Presentation_Form:remote-sensing image
Type_of_Source_Media:external hard drive
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:20180318
Ending_Date:20190427
Source_Currentness_Reference:
ground condition
Source_Citation_Abbreviation:
PHOTO
Source_Contribution: 
Aerial imagery was acquired using a Leica ADS100 camera with a flight design that included a total of 71 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.
Source_Information:
Source_Citation:
Citation_Information:
Originator:Quantum Spatial, Inc.
Publication_Date:20190917
Title:
Aerotriangulation
Geospatial_Data_Presentation_Form:model
Type_of_Source_Media:online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:2019
Source_Currentness_Reference:
ground condition
Source_Citation_Abbreviation:
AT
Source_Contribution: 
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.
Source_Information:
Source_Citation:
Citation_Information:
Originator:Quantum Spatial, Inc.
Publication_Date:20190917
Title:
DEM
Geospatial_Data_Presentation_Form:raster digital data
Type_of_Source_Media:online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:2019
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
DEM
Source_Contribution: 
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.
Process_Step:
Process_Description: 
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 South FIPS 3702 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.
Source_Used_Citation_Abbreviation:
Georefs
Source_Used_Citation_Abbreviation:
AT
Source_Used_Citation_Abbreviation:
Control
Source_Used_Citation_Abbreviation:
DEM
Process_Date:20190917
Source_Produced_Citation_Abbreviation:
Orthos
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method:Raster
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name:State Plane Coordinate System
State_Plane_Coordinate_System:
SPCS_Zone_Identifier:3702
Lambert_Conformal_Conic:
Standard_Parallel:39.9333333333
Standard_Parallel:40.9666666667
Longitude_of_Central_Meridian:-77
Latitude_of_Projection_Origin:39.3333333333
False_Easting:1968500
False_Northing:0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method:row and column
Coordinate_Representation:
Abscissa_Resolution:0.5
Ordinate_Resolution:0.5
Planar_Distance_Units:Foot US
Geodetic_Model:
Horizontal_Datum_Name:D North American 1983 HARN
Ellipsoid_Name:Geodetic Reference System 80
Semi-major_Axis:6378137.0
Denominator_of_Flattening_Ratio:298.257222101
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Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: 
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.
Entity_and_Attribute_Detail_Citation: 
U.S. Department of the Interior, U.S. Geological Survey, 1996, Standards for Digital Orthophotos: Reston, VA.
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Pennsylvania Spatial Data Access (PASDA)
Contact_Address:
Address_Type:mailing and physical address
Address: 
115 Land and Water building
City:University Park
State_or_Province:Pennsylvania
Postal_Code:16802
Country:United States
Contact_Voice_Telephone:(814) 865 - 8792
Contact_Electronic_Mail_Address:pasda@psu.edu
Distribution_Liability: 
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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Metadata_Reference_Information:
Metadata_Date:20190916
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Quantum Spatial, Inc.
Contact_Address:
Address_Type:mailing and physical
Address: 
523 Wellington Way
City:Lexington
State_or_Province:KY
Postal_Code:40503
Country:USA
Contact_Voice_Telephone:859-277-8700
Contact_Facsimile_Telephone:859-277-8901
Hours_of_Service:Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
Metadata_Standard_Name:FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version:FGDC-STD-001-1998
Metadata_Access_Constraints:None.
Metadata_Use_Constraints:
None.
Metadata_Security_Information:
Metadata_Security_Classification_System:None.
Metadata_Security_Classification:Unclassified
Metadata_Security_Handling_Description:
NONE
Metadata_Extensions:
Online_Linkage: None.
Profile_Name:None.
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