Quantum Spatial
2015
Delaware Valley 2015 LiDAR
USGS Contract: G10PC00026 Task Order Number: G15PD00316
DE_Valley_2015
model
Geographic Extent: Delaware Valley, covering approximately 3260 square miles over the Philadelphia Metro area, comprised of of 8 contiguous counties located in the states of Pennsylvania and New Jersey.
Dataset Description: Delaware Valley 2015 LiDAR project called for the Planning, Acquisition, processing and derivative products of LIDAR data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. 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 UTM Zone 18, NAD83 (2011), meters and vertical datum of NAVD1988 (GEOID12A), meters. LiDAR data was delivered in RAW flight line swath format, processed to create Classified LAS 1.4 Files formatted to 25 individual 1500 meter X 1500 meter tiles for the pilot (3752 individual 1500 meter X 1500 meter tiles for the entire project area), Bare Earth DEMs tiled to the same 1500 meter X 1500 meter tile schema, and Breaklines in Esri shapefile format.
Ground Conditions: LiDAR was collected in spring of 2015, 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, Quantum Spatial established a total of 155 Land Cover control points that were used to calibrate the LIDAR to known ground locations established throughout the Delaware Valley project area (75 calibration control points).
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-meter cell size.
These raw lidar point cloud data were used to create classified lidar LAS files, 3D breaklines, and hydro-flattened DEMs as necessary.
USGS Contract: G10PC00026 Task Order Number: G15PD00316
CONTRACTOR: Quantum Spatial
Lidar data were acquired and calibrated by Quantum Spatial.
All follow-on processing was completed by the prime contractor.
20150412
20150523
ground condition
None planned
-75.7114343254321
-74.3752046076557
40.610171463261
39.502118241734
439500.000000
553500.000000
4495500.000000
4372500.000000
None
Elevation data
Lidar
Hydrology
None
Delaware Valley
New Jersey
Burlington County
Camden County
Gloucester County
Mercer County
Pennsylvania
Bucks County
Delaware County
Mercer County
Philadelphia Coutny
No restrictions apply to this data.
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.
Quantum Spatial, Data Acquisition Department
Tobin Guthrie
mailing and physical
523 Wellington Way
Lexington
KY
40503
USA
859-277-8700
859-277-8901
tguthrie@quantumspatial.com
Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.
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\26236_DVRPC_LiDAR\ 24.1 GB and
\\Matrix\LIDAR\26236_DVRPC\ 5.09 TB
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 Nonvegetated Vertical Accuracy specifications.
The specifications require that only Nonvegetated Vertical Accuracy (NVA) be computed for raw lidar point cloud swath files. The vertical accuracy was tested with 155 independent survey located in open terrain. These check points were not used in the calibration or post processing of the lidar point cloud data. 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.
0.080
The NVA was tested using 87 independent surveys located in open terrain. The survey check points were distributed throughout the project area. The 87 independent check points were surveyed using the closed level loop technique. Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the lidar surface were then compared to the elevation values of the surveyed control. The RMSE was computed to be 0.041 meters. AccuracyZ has been tested to meet 19.6 cm 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.
Quantum Spatial
2015
Control Survey Report: Delaware Valley Ortho and Lidar Task Order
vector digital data and tabular data
Lexington, KY
Quantum Spatial
CD-ROM
2015
ground condition
DE_Valley_2015_LiDAR_ctrl
This data source was used (along with the airborne GPS/IMU Data) to aid in the georeferencing of the lidar point cloud data.
Quantum Spatial
2015
Lidar RAW Data for Delaware Valley 2015
lidar data
Quantum Spatial
2015
online
20150412
20150523
ground condition
DE_Valley_2015_LiDAR_Data
This data source was used to populate the lidar point cloud data.
Hydro Flattening Breakline Processing:
Class 2 LiDAR was 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 30 meter 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 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 10).
The breakline files were then translated to ESRI File-Geodatabase format using ESRI conversion tools.
DE_Valley_2015_LiDAR_ctrl
DE_Valley_2015_LiDAR_Data
2015
Hydro Flattened Breaklines
Quantum Spatial
Paul Bishop
mailing and physical
523 Wellington Way
Lexington
KY
40503
USA
859-277-8700
859-277-8901
pbishop@quantumspatial.com
Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.
Point
Point
Universal Transverse Mercator
18
0.9996
-75.0
0.0
500000.0
0.0
coordinate pair
0.01
0.01
meter
North American Datum of 1983 (2011)
Geodetic Reference System 80
6378137
298.257222101
North American Vertical Datum of 1988
0.01
meters
Explicit elevation coordinate included with horizontal coordinates
20150930
Quantum Spatial
Sarah Zibart
mailing and physical
523 Wellington Way
Lexington
KY
40503
USA
859-277-8700
859-277-8901
szibart@quantumspatial.com
Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
None.
None.
None.
Unclassified
NONE