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Short Citation:
OCM Partners, 2023: 2009 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Lewis County, Washington,

Item Identification

Title: 2009 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Lewis County, Washington
Short Name: wa2009_pslc_lewis_m2520_metadata
Status: Completed
Publication Date: 2013-06-13

Watershed Sciences, Inc. (WSI) collected Light Detection and Ranging (LiDAR) data for the Lewis County survey area

for the Puget Sound LiDAR Consortium. This data set covers approximately 547 square miles. Delivery 1 of the survey

area was collected on July 18th, 19th and 20th of 2009.

The LiDAR survey utilized both a Leica ALS60 and a Leica ALS50-II sensor in a Cessna Caravan 208B. All areas were

surveyed with an opposing flight line side-lap of 50% (=100% overlap) to reduce laser shadowing and increase

surface laser painting. The Leica laser systems allow up to four range measurements (returns) per pulse,

and all discernible laser returns were processed for the output dataset.

This LiDAR survey achieved a nominal point spacing of 8.82 points per square meter.

Original contact information:

Contact Org: Puget Sound LiDAR Consortium / Puget Sound Regional Council

Phone: 206-464-5325


The LAS files can be used to create DEMs and also to extract topographic data in software that does not support

raster data. Other surface features can also be extracted with custom applications. LiDAR

data has a wide range of uses such as earthquake hazard studies, hydrologic modeling,

forestry, coastal engineering, roadway and pipeline engineering, flood plain mapping,

wetland studies, geologic studies and a variety of analytical and cartographic projects.



Supplemental Information:

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

A LiDAR Report from the vendor for this data set may be viewed here:


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

Entity Attribute Detail Citation:


Distribution Liability:

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

of Watershed Sciences Inc., PSLC, NOAA, the Office for Coastal Management or its partners.

Data Set Credit: Please credit the Puget Sound LiDAR Consortium (PSLC). 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. For more information, visit <>

Support Roles

Data Steward

CC ID: 692529
Date Effective From: 2013-06-13
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: 692531
Date Effective From: 2013-06-13
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: 692532
Date Effective From: 2013-06-13
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: 692530
Date Effective From: 2013-06-13
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: 1134184
W° Bound: -122.787304
E° Bound: -121.532047
N° Bound: 46.81886
S° Bound: 46.380671

Extent Group 1 / Time Frame 1

CC ID: 1134183
Time Frame Type: Range
Start: 2009-07-18
End: 2009-07-20

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:

In some areas of heavy vegetation or forest cover, there may be relatively few ground points in the LiDAR data.

TINing the points produces large triangles and hence the elevations may be less accurate within such areas.

Elevation values for open water surfaces are not valid elevation values because few LiDAR points are returned

from water surfaces. Triangles were created across water surfaces by interpolating from the nearest land points

Distribution Information

Distribution 1

CC ID: 743348
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: 743349
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 743351
URL Type:
Online Resource


CC ID: 743352
URL Type:
Online Resource


CC ID: 743353
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz

This graphic shows the lidar coverage for the PSLC Topographic Lewis County

LiDAR survey area in Washington state.

Activity Log

Activity Log 1

CC ID: 692551
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 692550
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: 718761
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743350
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Data Quality


Elevations are recorded in floating-point meters and the vertical datum is ellipsoidal (GEOID03).

There are no other attribute tables.

Horizontal Positional Accuracy:

See LiDAR data report.

Vertical Positional Accuracy:

See LiDAR data report.; Quantitative Value: 0.030 meters, Test that produced the value: The Root Mean Square Error (RMSE) of the data set is 0.10 feet.

Completeness Report:

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

Conceptual Consistency:

LiDAR flight lines have been examined to ensure that there was at least 50% sidelap, there are no gaps

between flightlines, and overlapping flightlines have consistent elevation values.

Shaded relief images have been visually inspected for data errors such as pits, border artifacts, gaps,

and shifting. The data was examined at a 1:3500 scale.


Process Steps

Process Step 1

CC ID: 1134180

1.Flight lines and data were reviewed to ensure complete coverage of the study area and positional

accuracy of the laser points. 2. Laser point return coordinates were computed using the IPAS survey

suite and ALS Post Processing software based on independent data from the LiDAR system, IMU, and

aircraft. 3. The raw LiDAR file was assembled into flight lines per return with each point having

an associated x, y, and z coordinate. 4. Visual inspection of swath to swath laser point

consistencies within the study area were used to perform manual refinements of system

alignment. 5. Custom algorithms were designed to evaluate points between adjacent flight

lines. Automated system alignment was computed based upon randomly selected swath to swath

accuracy measurements that consider elevation, slope, and intensities. Specifically,

refinement in the combination of system pitch, roll and yaw offset parameters optimize internal

consistency. 6. Noise (e.g., pits and birds) was filtered using ALS software tools based on known

elevation ranges and included the removal of any cycle slips. 7. Using TerraScan and Microstation,

ground classifications utilized custom settings appropriate to the study area. 8. The corrected

and filtered return points were compared to the RTK ground survey points collected to verify the

vertical and horizontal accuracies. 9. Points were broken into processing bins and output areas

and output as laser points, TINed and GRIDed surfaces. Bare earth DEMs meet PSLC specification.

Process Date/Time: 2009-12-10 00:00:00

Process Step 2

CC ID: 1134181

The NOAA Office for Coastal Management (OCM) downloaded topographic files in .LAZ format from PSLC's

website. The files contained LiDAR elevation and intensity measurements. The data were received in

Washington State Plane South Zone 4602, 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. ASCII xyz files were parsed to LAS files.

2. The topographic LAS files were converted from orthometric (NAVD88) heights to ellipsoidal

heights using Geoid03.

3. The topographic LAS files were converted from a Projected Coordinate System (WA SP South)

to a Geographic Coordinate system (NAD83).

4. The topographic LAS files' vertical units were converted from feet to meters.

5. The topographic LAS files' were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid)

heights using Geoid03.

6. The topographic LAS files were geotagged and header information was updated.

Process Date/Time: 2013-08-01 00:00:00

Catalog Details

Catalog Item ID: 50156
GUID: gov.noaa.nmfs.inport:50156
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