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OCM Partners, 2023: 2014 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Cedar River Watershed (Delivery 1),

Item Identification

Title: 2014 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Cedar River Watershed (Delivery 1)
Short Name: wa2014_pslc_cedarriver_delivery1_m3674_metadata
Status: Completed
Publication Date: 2014-04-14

In September 2013, WSI, a Quantum Spatial company (QSI), was contracted by the Puget Sound LiDAR Consortium (PSLC) to collect Light Detection and Ranging (LiDAR) data over three areas of interest (AOIs) in the greater Seattle, Washington area. The individual AOIs include the Cedar River Watershed and Floodplain, Lake Youngs Reservoir, and the SCL/Tolt Reservoir, herein all referred to as the Cedar Watershed LiDAR project. This metadata refers to the first delivery of many.

Tiles were delivered as state plane orthometric x,y,z values but have since been reprojected/transformed to geographic, ellipsoidal coordinates for OCM use and storage. Original naming conventions will apply to the FTP available data. The average first-return density of LiDAR data for the Cedar Watershed LiDAR project was 1.15 points per sq. ft (12.41 points per sq m) while the average ground classified density was 0.25 points per sq. ft (2.67 points per sq m)


Data were collected to aid PSLC in assessing the topographic and geophysical properties of the study area.



Supplemental Information:

A footprint of this data set may be viewed in Google Earth at:

The final report for this project can be viewed at:


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
None LAZ

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: las
Entity Attribute Overview:

LiDAR points in LAZ format (ASPRS Classes 1,2)

Entity Attribute Detail Citation:


Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility

of Quantum Spatial, PSLC, NOAA, the Office for Coastal Management or its partners.

Data Set Credit: Please credit the Puget Sound LiDAR Consortium (PSLC) for these data. The PSLC is supported by the Puget Sound Regional Council, the National Aeronautical and Space Administration (NASA), the United States Geological Survey (USGS) and numerous partners in local, state, and tribal government.

Support Roles

Data Steward

CC ID: 693285
Date Effective From: 2014-04-14
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 693287
Date Effective From: 2014-04-14
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 693288
Date Effective From: 2014-04-14
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 693286
Date Effective From: 2014-04-14
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1135834
W° Bound: -122.2338078
E° Bound: -121.9177786
N° Bound: 48.0757049
S° Bound: 47.7500003

Extent Group 1 / Time Frame 1

CC ID: 1135833
Time Frame Type: Range
Start: 2013-12-11
End: 2014-02-06

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL:


Data Access Constraints:


Data Use Constraints:

Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. These data depict the heights at the time of the survey and are only accurate for that time.

Distribution Information

Distribution 1

CC ID: 743472
Download URL:
File Name: Customized Download

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 743473
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 743475
URL Type:
Online Resource


CC ID: 743476
URL Type:
Online Resource


CC ID: 743477
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz

This graphic shows the lidar coverage for the first delivery of the 2014 Cedar River lidar project, with at least one other separate delivery awaiting.

Activity Log

Activity Log 1

CC ID: 693306
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 693305
Activity Date/Time: 2017-11-14

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718783
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743474
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Data Quality


All discernible laser returns were processed for the output dataset. The discrepancy between native and delivered density will vary depending on terrain, land cover, and the prevalence of water bodies.

Horizontal Positional Accuracy:

When collecting RTK and PPK data, the rover records data while stationary for five seconds, then calculates the pseudorange position using at least three one-second epochs. Relative errors for the position must be less than 1.5 cm horizontal and 2.0 cm vertical in order to be accepted.; Quantitative Value: 0.015 meters, Test that produced the value: GSP were collected in areas where good satellite visibility was achieved on paved roads and other hard surfaces such as gravel or packed dirt roads

Vertical Positional Accuracy:

The mean and standard deviation (sigma) of divergence of the ground surface model from ground survey point coordinates are also considered during accuracy assessment. These statistics assume the error for x, y and z is normally distributed, and therefore the skew and kurtosis of distributions are also considered when evaluating error statistics. For the Cedar Watershed LiDAR survey, 1,363 ground survey points were collected in total resulting in an average accuracy of -0.28 feet (-0.009 meters). RMSE calculated to be 0.085 ft (0.026 m); Quantitative Value: 0.051 meters, Test that produced the value: FVA (1.96 * RMSE) of 0.167 ft (~5.1 cm), RMSE calculated to be 0.085 ft (0.026 m)

Completeness Report:

LiDAR data has been collected and processed for all areas within the project study area.

Conceptual Consistency:

All areas were surveyed with an opposing flight line side-lap of more than 50 percent (more than 100 percent overlap) in order to reduce laser shadowing and increase surface laser painting. To accurately solve for laser point position (geographic coordinates x, y and z), the positional coordinates of the airborne sensor and the attitude of the aircraft were recorded continuously throughout the LiDAR data collection mission. Position of the aircraft was measured twice per second (2 Hz) by an onboard differential GPS unit, and aircraft attitude was measured 200 times per second (200 Hz) as pitch, roll and yaw (heading) from an onboard inertial measurement unit (IMU). To allow for post-processing correction and calibration, aircraft and sensor position and attitude data are indexed by GPS time.


Process Steps

Process Step 1

CC ID: 1135829

Upon completion of data acquisition, QSI processing staff initiated a suite of automated and manual techniques to process the data into the requested deliverables. Processing tasks included GPS control computations, smoothed best estimate trajectory (SBET) calculations, kinematic corrections, calculation of laser point position, sensor and data calibration for optimal relative and absolute accuracy, and LiDAR point classification

Process Date/Time: 2014-03-01 00:00:00

Process Step 2

CC ID: 1135830

1. Resolve kinematic corrections for aircraft position data using kinematic aircraft GPS and static ground GPS data.

2. Develop a smoothed best estimate of trajectory (SBET) file that blends post-processed aircraft position with sensor head position and attitude recorded throughout the survey.

3. Calculate laser point position by associating SBET position to each laser point return time, scan angle, intensity, etc. Create raw laser point cloud data for the entire survey in *.las (ASPRS v. 1.2) format. Convert data to orthometric elevations by applying a geoid03 correction.

4. Import raw laser points into manageable blocks (less than 500 MB) to perform manual relative accuracy calibration and filter erroneous points. Classify ground points for individual flight lines

5. Using ground classified points per each flight line, test the relative accuracy. Perform automated line-to-line calibrations for system attitude parameters (pitch, roll, heading), mirror flex (scale) and GPS/IMU drift. Calculate calibrations on ground classified points from paired flight lines and apply results to all points in a flight line. Use every flight line for relative accuracy calibration. 6. Classify resulting data to ground and other client designated ASPRS classifications. Assess statistical absolute accuracy via direct comparisons of ground classified points to ground control survey data.

7. Generate bare earth models as triangulated surfaces. Generate highest hit models as a surface expression of all classified points.

Process Date/Time: 2014-03-01 00:00:00

Process Step 3

CC ID: 1135831

The NOAA Office for Coastal Management (OCM) downloaded topographic files in LAS format from PSLC's FTP site. The files contained lidar elevation, intensity, return number, class, scan angle and GPS time measurements. The data were received in Washington State Plane North Zone 4601, NAD83 coordinates and were vertically referenced to NAVD88 using the Geoid03 model. The vertical units of the data were

feet. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid03, and from feet to meters.

2. The las files were converted from a Projected Coordinate System (WA SP South) to a Geographic Coordinate system (NAD83), converting from feet to decimal degrees.

Process Date/Time: 2014-08-15 00:00:00

Catalog Details

Catalog Item ID: 50177
GUID: gov.noaa.nmfs.inport:50177
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:24+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16