Philadelphia aerial photography 2020

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Distributor 1
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:City of Philadelphia

Publication_Date:2020

Title:

Philadelphia aerial photography 2020

Geospatial_Data_Presentation_Form:remote-sensing image

Publication_Information:

Publication_Place:Philadelphia , PA

Other_Citation_Details:

April 1, 2020 through May 4, 2020

Online_Linkage: http://www.pasda.psu.edu/

Description:

Abstract:

Color Citywide digital orthophotography with a ground resolution of at various resolutions, georeferenced to the Pennsylvania State Plane Coordinate System, and delivered as individual and mosaicked raster images. The dataset consists of tiled orthogonal imagery produced from nadir images captured by various contractors during the months of April and May.

Purpose:

educational

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:2020

Currentness_Reference:

publication date

Status:

Progress:Complete

Maintenance_and_Update_Frequency:As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -75.284081

East_Bounding_Coordinate: -74.954057

North_Bounding_Coordinate: 40.143701

South_Bounding_Coordinate: 39.861859

Keywords:

Theme:

Theme_Keyword_Thesaurus:ISO 19115 Topic Categories

Theme_Keyword:orthos

Theme_Keyword:imageryBaseMapsEarthCover

Theme:

Theme_Keyword_Thesaurus:ISO 19115 Topic Categories

Place:

Place_Keyword_Thesaurus:City of Philadelphia

Place_Keyword:Philadelphia

Access_Constraints:The City of Philadelphia reserves all rights in the City's databases and any data contained therein, and the end user’s use of the data does not constitute a transfer of, nor does the end user receive, any title or interest in the database or any other City data. The City of Philadelphia makes no representation about the accuracy of any specific information in this data and is provided “as is” and without Warranty of any kind. The user of this data will assume complete responsibility for any and all occurrences resulting from its use or display and will hold the City of Philadelphia harmless from any and all claims, demands, liabilities, obligations, damages, suits, judgments or settlements, including reasonable costs and attorneys' fees, that arise from use of this data.

Use_Constraints:

None

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Philadelphia Office of Innovation and Technology

Contact_Position:GIS Manager

Contact_Address:

Address_Type:mailing and physical address

Address:

1234 Market Street

City:Philadelphia

State_or_Province:PA

Postal_Code:19107

Country:USA

Contact_Voice_Telephone:215-686-8101

Contact_Electronic_Mail_Address:maps@phila.gov

Hours_of_Service:8:30 AM - 4:30 PM

Data_Set_Credit:

PCPC - Graphics/GIS Division

Security_Information:

Security_Classification_System:No security considerations

Security_Classification:Unclassified

Security_Handling_Description:N/A

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535

Cross_Reference:

Citation_Information:

Originator:City of Philadelphia

Online_Linkage: www.pasda.psu.edu

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

None completed.

Logical_Consistency_Report:

The dataset consists of tiled orthogonal imagery produced from nadir images captured by Pictometry International. Automatic aerial triangulation (AAT) was performed. The triangulated frames were rectified to a LiDAR derived DEM. Mosaicing was performed using an automatic seaming algorithm and manually edited to eliminate seams through elevated features where possible

Acquisition:
Flight plans were prepared to capture image frames with 60% forward overlap and 30% sidelap in order to provide sufficient overlap for automatic aerial triangulation and mitigation of building lean in orthophotography produced. Source imagery was acquired during times of optimal environmental conditions. Imagery will generally be captured when solar altitude is 30 degrees or greater and/or by using the most optimal four-hour window, except where capture season offers significantly longer window. Imagery was acquired with ground free of snow cover and deciduous vegetation less than 30% of full bloom. Frames with clouds were rejected and reflown. Any planned deviation from these conditions imposed by capture window constraints was discussed with client prior to commencement of acquisition.


Ortho-Rectification:
Prior to the production of orthophotography, the vendor performed automatic aerial triangulation, utilizing the directly observed Exterior Orientations (EOs) and ground control points (GCPs), measured by a licensed surveyor, for the purpose of orienting the individual frames for creation of the final ortho imagery. In addition to the GCPs, sophisticated matching techniques was employed to automatically create tie points for use in performing a bundle adjustment. The vendor utilized best available Digital Terrain Models, combined with the calibrated camera interior orientations, ground control points, and triangulated EOs to rectify the images. When the rectification requires a resampling of the source imagery, a cubic convolution method was utilized. 

Completeness_Report:

Citywide

Lineage:

Process_Step:

Process_Description:

Metadata imported.

Process_Step:

Process_Description:

Metadata imported.

Cloud_Cover:0

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method:Raster

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name:Lambert Conformal Conic

Lambert_Conformal_Conic:

Lambert Conformal Conic

Standard_Parallel:39.933333

Standard_Parallel:40.966667

Longitude_of_Central_Meridian:-77.750000

Latitude_of_Projection_Origin:39.333333

False_Easting:1968500.000000

False_Northing:0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method:coordinate pair

Coordinate_Representation:

Abscissa_Resolution:0.000256

Ordinate_Resolution:0.000256

Planar_Distance_Units:survey feet

Geodetic_Model:

Horizontal_Datum_Name:North American Datum of 1983

Ellipsoid_Name:Geodetic Reference System 80

Semi-major_Axis:6378137.000000

Denominator_of_Flattening_Ratio:298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label:Band_1

Attribute:

Attribute_Label:ObjectID

Attribute_Definition:

Internal feature number.

Attribute_Definition_Source:

ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label:Value

Attribute:

Attribute_Label:Count

Detailed_Description:

Entity_Type:

Entity_Type_Label:Band_2

Attribute:

Attribute_Label:ObjectID

Attribute_Definition:

Internal feature number.

Attribute_Definition_Source:

ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label:Value

Attribute:

Attribute_Label:Count

Detailed_Description:

Entity_Type:

Entity_Type_Label:Band_3

Attribute:

Attribute_Label:ObjectID

Attribute_Definition:

Internal feature number.

Attribute_Definition_Source:

ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label:Value

Attribute:

Attribute_Label:Count

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Philadelphia Office of Innovation and Technology

Resource_Description:Downloadable Data

Distribution_Liability:

This dataset contains errors that are an artifact of the interpretation, source material and conversion process. The data and documentation are provided "as is." The City of Philadelphia (CITY) makes no warranty or representation, either express or implied, with respect to the data or accompanying documentation, including its quality, performance or accuracy. The CITY will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the data or any accompanying documentation. The CITY is working to correct errors found in its datasets. Users discovering errors or making corrections to the data are requested to report such errors to the CITY at 215-686-XXXX

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size:220.299

Fees:N/A

Ordering_Instructions:

N/A

Turnaround:N/A

Standard_Order_Process:

Non-digital_Form:

N/A

Digital_Form:

Digital_Transfer_Information:

Transfer_Size:220.299

Fees:N/A

Ordering_Instructions:

N/A

Turnaround:N/A

Custom_Order_Process:

THE CITY OF PHILADELPHIA DOES NOT CURRENTLY HAVE A COMMERCIAL DISTRIBUTION POLICY.

Technical_Prerequisites:

Must have a GIS capable of reading ESRI spatial data formats.

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:unknown

Time of Day:unknown

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Pennsylvania Spatial Data Access (PASDA)

Contact_Address:

Address_Type:mailing 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

Resource_Description:downloadabledata

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.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size:220.299

Metadata_Reference_Information:

Metadata_Date:2020

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Pennsylvania Spatial Data Access (PASDA)

Contact_Address:

Address_Type:mailing 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

Metadata_Standard_Name:FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version:FGDC-STD-001-1998

Metadata_Time_Convention:local time

Metadata_Extensions:

Online_Linkage:

Profile_Name:ESRI Metadata Profile

Metadata_Extensions:

Online_Linkage:

Profile_Name:ESRI Metadata Profile