2018 City of Philadelphia Classified LiDAR LAS
Identification_Information:
Citation:
Citation_Information:
Originator:City of Philadelphia
Publication_Date:2018
Title:
2018 City of Philadelphia Classified LiDAR LAS
Online_Linkage: http://www.pasda.psu.edu
Description:
Abstract: 
2018 LiDAR – 8ppm – Classified. LiDAR and LAS data was gathered for the City of Philadelphia in April 2018. DEMs were generated from the raw data. This dataset is lidar point cloud data covering the City of Philadelphia, PA, approximately 239 sq miles total. Each LAS file contains LiDAR point information, which has been calibrated, controlled, and classified. At the time of capture ground conditions were leaf-off, snow free, and water was at normal levels.

Key attribute field names and descriptions:
LiDAR Classification Categories:
0 Created Not Classified
1 Unclassified
2 Ground
3 Low vegetation
4 Vegetation
5 High vegetation
6 Building
9 Water
17 Bridge Deck
Purpose: 
Process Process Data cover the entire area specified for this project. These raw LAS data files include all data points collected. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The raw point cloud is of good quality and data passes Fundamental Vertical Accuracy specifications. The specifications require that only Nonvegetated Vertical Accuracy (NVA) can be computed for raw lidar point cloud swath files. The vertical accuracy was tested with 10 independent surveys located in open terrain. The survey check points were distributed throughout the project. Specifications for this project require that the NVA be 19.6 cm or better AccuracyZ at 95 percent confidence level. 0.051 centimeters AccuracyZ at 95 percent Confidence Interval. The RMSEz was computed to be 0.1 meters. AccuracyZ has been compiled to meet 10 cm Fundamental Vertical Accuracy at 95 Percent confidence level using RMSE(z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASRPS Guidelines. Airborne GPS and IMU data were merged to develop a Smoothed Best Estimate (SBET) of the lidar system trajectory for each lift. Lidar ranging data were initially calibrated using previous best parameters for this instrument and aircraft. Using Optech LiDAR Mapping Suite 4.2 software, relative calibration was evaluated using advanced plane-matching analysis and parameter corrections were derived. This relative calibration was repeated iteratively until residual errors between overlapping swaths, across all project lifts, was reduced to 3 cm or less. Data were then block adjusted to match surveyed calibration control. Lidar Post-Processing: After generation of the calibrated point cloud data in LAS format from Optech Lidar Mapping Suite (LMS), the data is imported into the TerraSolid software suite (running under Bentley MicroStation) for matching and classification. Upon import, the data is divided into tiles for the purpose of creating more manageable data. Once imported to TerraSolid, blocks of data containing overlapping flight lines are selected. The data in these blocks is analyzed by TerraMatch and adjustments to the roll, pitch, heading, and scale that minimize any data misalignment between the flight lines are computed. These adjustments are then applied to the entire mission’s worth of data. Data across the mission is then manually reviewed to ensure proper alignment between flightlines has been achieved. This process is then repeated for each mission; once complete, intra-sortie alignment is verified.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:2018
Currentness_Reference: 
ground condition
Status:
Progress:Complete
Maintenance_and_Update_Frequency:Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-75.281560
East_Bounding_Coordinate:-74.955030
North_Bounding_Coordinate:40.138940
South_Bounding_Coordinate:39.871330
Keywords:
Theme:
Theme_Keyword_Thesaurus:ISO 19115 Topic Categories
Theme_Keyword:City of Philadelphia
Theme_Keyword:LiDAR
Theme_Keyword:LAS
Theme_Keyword:topography
Theme_Keyword:contours
Theme_Keyword:planimetric
Theme_Keyword:Elevation
Theme_Keyword:imageryBaseMapsEarthCover
Access_Constraints:None
Use_Constraints: 
		The City of Philadelphia reserves all rights in the GIS database 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 GIS 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.Access and Use of this dataset is constrained by the license agreements between Pictometry International and the City of Philadelphia, PA.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Philadelphia Office of Innovation and Technology
Contact_Address:
Address_Type:mailing and physical address
Address: 
1234 Market Street
City:Philadelphia
State_or_Province:PA
Postal_Code:19107
Country:US
Contact_Voice_Telephone:215-686-8101
Contact_Electronic_Mail_Address:brian.ivey@phila.gov
Back to Top
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geodetic_Model:
Horizontal_Datum_Name:North American Datum of 1983
Ellipsoid_Name:Geodetic Reference System 80
Back to Top
Entity_and_Attribute_Information:
Overview_Description:
Back to Top
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.
Back to Top
Metadata_Reference_Information:
Metadata_Date:2019
Metadata_Contact:
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
Metadata_Standard_Name:FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version:FGDC-STD-001-1998
Metadata_Time_Convention:local time
Back to Top