USGS QL1 LiDAR for Allentown, PA 2016 - Classified LAS

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:Quantum Spatial

Publication_Date:2016

Title:

USGS QL1 LiDAR for Allentown, PA 2016 - Classified LAS

Geospatial_Data_Presentation_Form:Lidar point cloud

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

Description:

Abstract:

Geographic Extent: Allentown, Pennsylvania, covering approximately 20 square miles in eastern Pennsylvania. Dataset Description: Allentown, Pennsylvania 2016 QL1 LiDAR project called for the planning, acquisition, processing, and production of products derivative of LIDAR data to be collected at a nominal pulse spacing (NPS) of 0.35 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LIDAR Specification, Version 1.2. The data was developed based on a horizontal projection/datum of NAD83 (2011) State Plane Pennsylvania South Zone, US survey feet and vertical datum of NAVD1988 (GEOID 12B), US survey feet. LiDAR data was delivered in RAW flight line swath format, processed to create Classified LAS 1.4 Files formatted to 129 individual 2,500-foot X 2,500-foot tiles, 1-foot hydro-flattened bare-earth raster DEMs in ERDAS .IMG format and intensity images in GeoTIFF format, tiled to the same 2,500-foot X 2,500-foot tile schema. Hydro-flattened breaklines were produced in Esri file geodatabase format. A mosaic of the hydro-flattened bare-earth raster DEMs was produced in ERDAS .IMG format. Ground Conditions: LiDAR was collected in spring of 2016, while no snow was on the ground and rivers were at or below normal levels. In order to post process the LiDAR data to meet task order specifications, A total of 18 calibration control points in order to calibrate the LIDAR to known ground locations established throughout the project area. The accuracy of the data was checked with 20 NVA points and 5 VVA points (25 total QC checkpoints).

Purpose:

Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Breaklines and Raster DEMs. The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 1-foot cell size. These raw lidar point cloud data were used to create classified lidar LAS files, 3D breaklines, and hydro-flattened DEMs as necessary.

Supplemental_Information:

				USGS Contract: G16PC00016  Task Order Number: G16PD00442
			    CONTRACTOR: Quantum Spatial
			    Quantum Spatial used LiDAR data acquired by Richard Crouse, and Associates with control collected by Herbert, Rowland, and Grubic, Inc. 
			    All follow-on processing was completed by the prime contractor.
			

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:20160823

Currentness_Reference:

ground condition

Status:

Progress:Complete

Maintenance_and_Update_Frequency:None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate:-75.557001119897

East_Bounding_Coordinate:-75.4113585764082

North_Bounding_Coordinate:40.6416381950144

South_Bounding_Coordinate:40.5461340160323

Keywords:

Theme:

Theme_Keyword_Thesaurus:ISO 19115 Category

Theme_Keyword:Lidar

Theme_Keyword:Elevation data

Theme_Keyword:Hydrology

Theme_Keyword:imageryBaseMapsEarthCover

Place:

Place_Keyword_Thesaurus:None

Place_Keyword:United States

Place_Keyword:US

Place_Keyword:Pennsylvania

Place_Keyword:PA

Place_Keyword:Lehigh County

Place_Keyword:Allentown

Access_Constraints:No restrictions apply to this 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 its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Quantum Spatial, Data Acquisition Department

Contact_Person:Chris Holder

Contact_Address:

Address_Type:mailing and physical address

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

Contact_Electronic_Mail_Address:cholder@quantumspatial.com

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.

Native_Data_Set_Environment:

MicroStation Version 8; TerraScan Version 15; TerraModeler Version 15; GeoCue Version 2014.1.21.1; ESRI ArcGIS 10.2; Global Mapper 16; Leica Cloud Pro 1.2; Windows 7 Operating System \\PSIHQ_NX3200\Projects\Projects\27136_Allentown_USGS 3.65 GB and \\matrix\matrix\LIDAR\27136_USGS_Allentown_LiDAR_from_RCA 138 GB

Data_Quality_Information:

Logical_Consistency_Report:

Data cover the entire area specified for this project.

Completeness_Report:

			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 Nonvegetated Vertical Accuracy specifications.
		

Positional_Accuracy:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

					The specifications require that only raw Nonvegetated Vertical Accuracy (NVA) be computed for raw lidar point cloud swath files. The raw NVA was tested with 20 independent survey points distributed throughout the project area and located in open terrain. These checkpoints were not used in the calibration or post-processing of the lidar point cloud data. Specifications for this project require that the raw NVA be 19.6 cm or better AccuracyZ at 95 percent confidence level.
				

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value:0.03

Vertical_Positional_Accuracy_Explanation:

						The raw NVA was tested using 20 independent survey points located in open terrain. The surveyed checkpoints were distributed throughout the project area and surveyed using GNSS procedures and methodologies that provide reliable and consistent results to meet the project's accuracy requirements. Please see the Survey Report for more information. Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the unclassified lidar surface were then compared to the elevation values of the surveyed control. The RMSEz was computed to be 0.016 meters (0.051 feet) and AccuracyZ to be 0.030 meters (0.100 feet). This meets the required AccuracyZ value of 19.6 cm raw NVA at 95 percent confidence level using (RMSEz * 1.9600) as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines.
					

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:Herbert, Rowland, and Grubic, Inc.

Publication_Date:2016

Title:

Control Survey Report: Allentown, PA

Geospatial_Data_Presentation_Form:Lidar point cloud

Publication_Information:

Publication_Place:Harrisburg, PA

Publisher:Herbert, Rowland, and Grubic, Inc.

Type_of_Source_Media:online

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:2016

Source_Currentness_Reference:

ground condition

Source_Citation_Abbreviation:

PA_Allentown_2016_LiDAR_gnd_ctrl

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:Richard Crouse and Associates

Publication_Date:2016

Title:

Lidar RAW Data for Delaware Valley 2015

Geospatial_Data_Presentation_Form:Lidar point cloud

Publication_Information:

Publication_Place:Frederick, MD

Publisher:Richard Crouse and Associates

Type_of_Source_Media:online

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:20160326

Source_Currentness_Reference:

ground condition

Source_Citation_Abbreviation:

PA_Allentown_2016_LiDAR_Data

Source_Contribution:

This data source was used to populate the lidar point cloud data.

Source_Information:

Source_Citation:

Citation_Information:

Originator:Herbert, Rowland, and Grubic, Inc.

Publication_Date:2016

Title:

Control Survey Report: Allentown, PA

Geospatial_Data_Presentation_Form:Lidar point cloud

Publication_Information:

Publication_Place:Harrisburg, PA

Publisher:Herbert, Rowland, and Grubic, Inc.

Type_of_Source_Media:online

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:2016

Source_Currentness_Reference:

ground condition

Source_Citation_Abbreviation:

PA_Allentown_2016_LiDAR_qc_ctrl

Source_Contribution:

This data source was used to QC and vertically adjust the lidar point cloud data.

Process_Step:

Process_Description:

					Classified LAS Processing:
					The bare earth surface is then manually reviewed to ensure correct classification on the Class 2 (Ground) points.  After the bare-earth surface is finalized, it is then used to generate all hydro-breaklines through heads-up digitization.
					All ground (ASPRS Class 2) LiDAR data inside of the Lake Pond and Double Line Drain hydro flattening breaklines were then classified to water (ASPRS Class 9) using TerraScan macro functionality.  A buffer of 3 feet was also used around each hydro-flattened feature to classify these ground (ASPRS Class 2) points to Ignored ground (ASPRS Class 10).  All Lake Pond Island and Double Line Drain Island features were checked to ensure that the ground (ASPRS Class 2) points were reclassified to the correct classification after the automated classification was completed.  All bridge decks were classified to Class 17.
					All overlap data was processed through automated functionality provided by TerraScan to classify the overlapping flight line data to approved classes by USGS.  The overlap data was identified using the Overlap Flag, per LAS 1.4 specifications.
					All data was manually reviewed and any remaining artifacts removed using functionality provided by TerraScan and TerraModeler.  Global Mapper us used as a final check of the bare earth dataset.  GeoCue was then used to create the deliverable industry-standard LAS files for both the All Point Cloud Data and the Bare Earth.  Quantum Spatial proprietary software was used to perform final statistical analysis of the classes in the LAS files, on a per tile level to verify final classification metrics and full LAS header information.
				

Source_Used_Citation_Abbreviation:

PA_Allentown_2016_LiDAR_ctrl

Source_Used_Citation_Abbreviation:

PA_Allentown_2016_LiDAR_Data

Process_Date:2016

Source_Produced_Citation_Abbreviation:

Classified LAS

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Quantum Spatial

Contact_Person:Ryan Griffin

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

Contact_Electronic_Mail_Address:rgriffin@quantumspatial.com

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.

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method:Point

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type:Point

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

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:coordinate pair

Coordinate_Representation:

Abscissa_Resolution:0.01

Ordinate_Resolution:0.01

Planar_Distance_Units:survey feet

Geodetic_Model:

Horizontal_Datum_Name:North American Datum of 1983 (2011)

Ellipsoid_Name:Geodetic Reference System 80

Semi-major_Axis:6378137

Denominator_of_Flattening_Ratio:298.257222101

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name:North American Vertical Datum of 1988 (Geoid 12B)

Altitude_Resolution:0.01

Altitude_Distance_Units:feet

Altitude_Encoding_Method:Explicit elevation coordinate included with horizontal coordinates

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.

Metadata_Reference_Information:

Metadata_Date:20160826

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Quantum Spatial

Contact_Person:Sarah Zibart

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

Contact_Electronic_Mail_Address:szibart@quantumspatial.com

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