PEMA Orthoimagery 2018 - York County Mosaic


Identification_Information:
Citation:
Citation_Information:
Originator:Quantum Spatial, Inc.
Publication_Date:20190411
Title:
PEMA Orthoimagery 2018 - York County Mosaic
Geospatial_Data_Presentation_Form:remote-sensing image
Description:
Abstract:
This orthoimagery data set includes 0.5-foot (15-centimeter) 8-bit 4-band (RGBN) digital orthoimage tiles in GeoTIFF format. Geographic Extent: The York County AOI covers approximately 1019 total square miles (2639 total square kilometers) in the Commonwealth of Pennsylvania. Dataset Description: The PEMA 2018 0.5-foot Orthoimagery - York County Delivery 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 (15 centimeters). Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Ortho Specification, Version 1.0. The data were developed based on a horizontal projection/datum of NAD83 (2011) State Plane Pennsylvania South FIPS 3702, US Survey Feet. Orthoimagery data was delivered as 284 individual 0.5-foot (15-centimeter) 1" = 100' (1 cm = 12 m) GeoTIFF (uncompressed) 10,000-foot x 10,000-foot (3,048-meter x 3,048-meter) tiles. Ground Conditions: Aerial photography was captured during the winter and spring of 2018, 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 horizontal accuracy guidelines, Quantum Spatial, Inc. utilized a total of 496 QC points throughout the Commonwealth of Pennsylvania to assess the horizontal accuracy of the data. These checkpoints were not used to calibrate or post process the data.
Purpose:
This dataset depicts geographic features on the surface of the earth. It was created to current imagery data for York County.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:20180318
Ending_Date:20181211
Currentness_Reference:
ground condition
Status:
Progress:Complete
Maintenance_and_Update_Frequency:None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-76.9985210868
East_Bounding_Coordinate:-76.9626752469
North_Bounding_Coordinate:39.7151720508
South_Bounding_Coordinate:39.6874827837
Keywords:
Theme:
Theme_Keyword_Thesaurus:ISO 19115 Topic Categories
Theme_Keyword:0.5 foot orthoimage
Theme_Keyword:GeoTIFF
Theme_Keyword:rectified photograph
Theme_Keyword:rectified image
Theme_Keyword:orthophoto
Theme_Keyword:natural color orthophoto
Theme_Keyword:orthoimage
Theme_Keyword:image map
Theme_Keyword:Imagery/Base Maps/Earth Cover
Place:
Place_Keyword_Thesaurus:None
Place_Keyword:Commonwealth of Pennsylvania
Place_Keyword:York County
Access_Constraints:None
Use_Constraints:
None. However, users should be aware that temporal changes may have occurred since this data set 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.
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:2018
Title:
Control Survey Report
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:
This data source was used (along with the airborne GPS/IMU Data) to aid in the georeferencing of the LiDAR point cloud data.
Source_Information:
Source_Citation:
Citation_Information:
Originator:Quantum Spatial, Inc.
Publication_Date:2019
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:
Single_Date/Time:
Calendar_Date:2019
Source_Currentness_Reference:
ground condition
Source_Citation_Abbreviation:
PHOTO
Source_Contribution:
Aerial imagery was acquired using a Leica ADS100 Airborne Digital Sensor with a flight design that included a total of 61 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 6,500 feet (1,981 meters) above mean terrain.
Source_Information:
Source_Citation:
Citation_Information:
Originator:Quantum Spatial
Publication_Date:2019
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:2019
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:
ground condition
Source_Citation_Abbreviation:
DEM
Source_Contribution:
A compilation of LiDAR collected as part of this task order, along with data from the National Elevation Dataset was used create a surface for orthoimagery production.
Process_Step:
Process_Description:
Orthophoto Processing: Utilizing all four bands [blue (B), green (G), red(R), and near-infrared [NIR]] digital orthorectification was performed using bilinear interpolation algorithms resulting in a spatial and radiometric transformation of the digital image from line/sample space into NAD83 (2011) State Plane Pennsylvania South FIPS 3702, US Survey Feet. 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 DTM 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.
Source_Used_Citation_Abbreviation:
Georefs
Source_Used_Citation_Abbreviation:
AT
Source_Used_Citation_Abbreviation:
Control
Source_Used_Citation_Abbreviation:
DTM
Process_Date:2019
Source_Produced_Citation_Abbreviation:
Orthos
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method:Raster
Raster_Object_Information:
Raster_Object_Type:pixel
Row_Count:20000
Column_Count:20000
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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:39.93333333333333
Standard_Parallel:40.96666666666667
Longitude_of_Central_Meridian:-77.75
Latitude_of_Projection_Origin:39.33333333333334
False_Easting:1968500.0
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:US Survey Feet
Geodetic_Model:
Horizontal_Datum_Name:North American Datum of 1983 (2011)
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:
Four band orthoimagery is organized in four color bands or channels which represent the red, green, blue, and near-infrared (RGBN) portions of the spectrum. Each image pixel is assigned a quadruplet of numeric values, one for each color band. Numeric values range from 0 to 255. Void areas have a value of 0,0,0,0 (black).
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 Emergency Management Agency (PEMA)
Contact_Person:Jeff Boyle
Contact_Position:Deputy Director for 9-1-1
Contact_Address:
Address_Type:mailing and physical address
Address:
1310 Elmerton Avenue
City:Harrisburg
State_or_Province:PA
Postal_Code:17110
Country:United States of America
Contact_Voice_Telephone:717-651-2218
Contact_Electronic_Mail_Address:jefboyle@pa.gov
Resource_Description:The Pennsylvania Emergency Management Agency distributes data directly to program partners.
Distribution_Liability:
The Pennsylvania Emergency Management Agency shall not be held liable for improper or incorrect use of this data. This data and related graphics are not legal documents and are not intended to be used as such. The information contained in this data is dynamic and may change over time. The data is not better than the original sources from which it was derived. It is the responsibility of the data user to use the data appropriately and within the limitations of geospatial data in general. The Pennsylvania Emergency Management Agency gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of this data. It is strongly recommended that this data be directly acquired from the Pennsylvania Emergency Management Agency, and not indirectly through other sources which may have changed the data in some way. This disclaimer applies both to individual use of the data and aggregate use with other data.
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Metadata_Reference_Information:
Metadata_Date:20190410
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Quantum Spatial
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)
Contact Instructions:
If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.
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
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