PA_WesternPA_2019_D20 Lidar QL2; Breaklines
Identification_Information:
Citation:
Citation_Information:
Originator:NV5 Geospatial, powered by Quantum Spatial
Publication_Date:20210818
Title:
PA_WesternPA_2019_D20 Lidar QL2; Breaklines
Geospatial_Data_Presentation_Form:vector data
Description:
Abstract: 
       Product: Breakline data is used to hydroflatten the DEMs created for the PA_WesternPA_2019_D20 Lidar QL2 project. Breaklines are reviewed against LiDAR intensity imagery to verify completeness of capture.
       Geographic Extent: 22 counties in Pennsylvania, covering approximately 6282 total square miles.
       Dataset Description: The PA_WesternPA_2019_D20 Lidar QL2 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.71 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 2.1. The data were developed based on a horizontal projection/datum of NAD 1983 2011 StatePlane Pennsylvania North FIPS 3701 Ft US, Foot US and vertical datum of NAVD88 Geoid 12b, Foot US. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 7229 individual 5,000 ft x 5,000 ft tiles, and as tiled intensity imagery and tiled bare earth DEMs formatted to 1848 individual 10,000 ft x 10,000 ft tiles. Continuous breaklines were produced in Esri file geodatabase format.
       Ground Conditions: LiDAR was collected in fall 2019 and spring 2020, 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 and meet ASPRS vertical accuracy guidelines, NV5 Geospatial, powered by Quantum Spatial utilized a total of 274 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 485 independent accuracy checkpoints, 291 in Bare Earth and Urban landcovers (291 NVA points), 194 in Tall Weeds categories (194 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.
Purpose: 
To acquire detailed surface elevation data for use in conservation planning, design, research, floodplain mapping, dam safety assessments and elevation modeling, etc. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create intensity images, breaklines and raster DEMs. The purpose of these LiDAR data was to produce high accuracy 3D hydro-flattened digital elevation models (DEMs) with a 2.5 foot cell size. These raw LiDAR point cloud data were used to create classified LiDAR LAS files, intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.
Supplemental_Information: 
Breakline File Type = GDB; Breakline Elevation Units = Foot US; Downhill Treatment Applied = Monotonic, Proprietary; Type of Hydro Treatment Required = Hydro-Flattened
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:20191208
Ending_Date:20200502
Currentness_Reference: 
Ground condition
Status:
Progress:Complete
Maintenance_and_Update_Frequency:None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-80.5843959938
East_Bounding_Coordinate:-78.3617752292
North_Bounding_Coordinate:42.293791317
South_Bounding_Coordinate:40.6545205735
Keywords:
Theme:
Theme_Keyword_Thesaurus:None
Theme_Keyword:Model
Theme_Keyword:Breaklines
Theme_Keyword:LAS Point Cloud
Theme_Keyword:Intensity Image
Theme_Keyword:Raster
Theme_Keyword:DEM
Theme_Keyword:Building Footprints
Theme_Keyword:Remote Sensing
Theme_Keyword:Elevation Data
Theme_Keyword:Lidar
Theme_Keyword:Hydrology
Place:
Place_Keyword_Thesaurus:None
Place_Keyword:Pennsylvania
Place_Keyword:Armstrong County
Place_Keyword:Ashtabula County
Place_Keyword:Blair County
Place_Keyword:Butler County
Place_Keyword:Cambria County
Place_Keyword:Cattaraugus County
Place_Keyword:Chautauqua County
Place_Keyword:Clarion County
Place_Keyword:Clearfield County
Place_Keyword:Crawford County
Place_Keyword:Elk County
Place_Keyword:Erie County
Place_Keyword:Forest County
Place_Keyword:Indiana County
Place_Keyword:Jefferson County
Place_Keyword:Lawrence County
Place_Keyword:Mahoning County
Place_Keyword:McKean County
Place_Keyword:Mercer County
Place_Keyword:Trumbull County
Place_Keyword:Venango County
Place_Keyword:Warren 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.
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Data_Quality_Information:
Logical_Consistency_Report: 
Data cover the entire area specified for this project.
Completeness_Report: 
These raw LAS and LAS data files include all data points collected. No points have been removed or excluded. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications. Datasets contain complete coverage of tiles. A visual qualitative assessment was performed to ensure data completeness. There are no void areas or missing data. All files are inspected to ensure that they conform to the specified file naming conventions, all files load in their correct geographic position, all files conform to the project specifications for file standard and content.
Lineage:
Process_Step:
Process_Description: 
Hydro-Flattened Breakline Processing: Class 2 (ground) LiDAR points were used to create a bare earth surface model. The surface model was then used to heads-up digitize 2D breaklines of inland streams and rivers with a 100-foot nominal width and inland ponds and lakes of 2 acres or greater surface area. Elevation values were assigned to all Inland Ponds and Lakes, Inland Pond and Lake Islands, Inland Stream and River Islands, using TerraModeler functionality. Elevation values were assigned to all inland streams and rivers using NV5 Geospatial, powered by Quantum Spatial proprietary software. All Ground (ASPRS Class 2) LiDAR data inside of the collected inland breaklines were then classified to Water (ASPRS Class 9) using TerraScan macro functionality. A buffer of 1 meter was also used around each hydro-flattened feature. These points were moved from ground (ASPRS Class 2) to Ignored Ground (ASPRS Class 20). The breakline files were then translated to Esri file geodatabase format using Esri conversion tools. Breaklines were reviewed against LiDAR intensity imagery to verify completeness of capture. All breaklines were then compared to TINs (triangular irregular networks) created from ground only points prior to water classification. The horizontal placement of breaklines was compared to terrain features and the breakline elevations were compared to LiDAR elevations to ensure all breaklines matched the LiDAR within acceptable tolerances. Some deviation was expected between breakline and LiDAR elevations due to monotonicity, connectivity, and flattening rules that were enforced on the breaklines. Once completeness, horizontal placement, and vertical variance were reviewed, all breaklines were reviewed for topological consistency and data integrity using a combination of Esri Data Reviewer tools and proprietary tools.
Process_Date:2021
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method:Vector
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name:State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier:3701
Lambert_Conformal_Conic:
Standard_Parallel:40.8833333333
Standard_Parallel:41.95
Longitude_of_Central_Meridian:-77
Latitude_of_Projection_Origin:40.1666666667
False_Easting:1968500
False_Northing:0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method:coordinate pair
Coordinate_Representation:
Abscissa_Resolution:0.001
Ordinate_Resolution:0.001
Planar_Distance_Units:Foot US
Geodetic_Model:
Horizontal_Datum_Name:D NAD 1983 2011
Ellipsoid_Name:Geodetic Reference System 80
Semi-major_Axis:6378137.0
Denominator_of_Flattening_Ratio:298.257222101
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name:NAVD88 Geoid 12b
Altitude_Resolution:0.001
Altitude_Distance_Units:Foot US
Altitude_Encoding_Method:Explicit elevation coordinate included with horizontal coordinates
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_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:Downloadable Data
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:
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Metadata_Reference_Information:
Metadata_Date:20210818
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:NV5 Geospatial, powered by 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)
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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