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Short Citation:
OCM Partners, 2022: 2006 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Lewis County, WA, https://www.fisheries.noaa.gov/inport/item/50152.

Item Identification

Title: 2006 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Lewis County, WA
Short Name: wa2006_pslc_lewiscounty_m2528_metadata
Status: Completed
Publication Date: 2013-08
Abstract:

Watershed Sciences, Inc. collected Light Detection and Ranging (LiDAR) data of Western Lewis County for the Puget Sound LiDAR Consortium. This data set covers approximately 400 square miles.

Data was collected in leaf-off conditions.

An Optech 3100 LiDAR system was mounted in a fixed-wing aircraft and flown 1,200 meters above ground level (AGL). A pulse repetition frequency (PRF) of 71 kHz with at least 100% overlap (minimum 50% side-lap) was used.

This data set acheived greater than 8 points per square meter.

Purpose:

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.

Notes:

10796

Supplemental Information:

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2528/supplemental/wa2006_pslc_lewiscounty_m2528.kmz

A lidar report of this data can be found at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2528/supplemental/wa2006_pslc_lewiscounty_m2528_lidar_report.pdf

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
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 1,2,7)

Entity Attribute Detail Citation:

none

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) 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: 692400
Date Effective From: 2013-08
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 692402
Date Effective From: 2013-08
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 692403
Date Effective From: 2013-08
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 692401
Date Effective From: 2013-08
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1134290
W° Bound: -123.382127
E° Bound: -122.67151
N° Bound: 46.799779
S° Bound: 46.383442

Extent Group 1 / Time Frame 1

CC ID: 1134289
Time Frame Type: Range
Start: 2006-03-19
End: 2006-03-29

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:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2528

;

Data Access Constraints:

None

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: 743324
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2528
Distributor:
File Name: Customized Download
Description:

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

Distribution 2

CC ID: 743325
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2528/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 743327
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 743328
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 743329
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2528/supplemental/wa2006_pslc_lewiscounty_m2528.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for a section of Lewis County, Washington.

Activity Log

Activity Log 1

CC ID: 692419
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 692418
Activity Date/Time: 2017-11-14
Description:

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

Activity Log 3

CC ID: 718757
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743326
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

Elevations are recorded in floating-point meters and the vertical datum is ellipsoidal (GEOID03). There are no other attribute tables.

Horizontal Positional Accuracy:

Not applicable for pure elevation data: every XY error has an associated Z error.

Vertical Positional Accuracy:

Laser point returns were optimized for internal consistency based on independent data from the LiDAR system, IMU, and aircraft. Noise points (e.g. pits and birds) were filtered from the

data based on known elevation ranges. This data was then compared to 1,522 real time kinematic ground survey points collected to verify the vertical and horizontal accuracies of the data set.

; Quantitative Value: 0.064 meters, Test that produced the value: Root mean square Z error (RMSEz) in open, near-horizontal areas. Unit in meters.

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.

Lineage

Process Steps

Process Step 1

CC ID: 1134285
Description:

Acquisition.

The LiDAR data was collected during March 2006. This was a leaf-off condition. An Optech 3100 LiDAR system was mounted in a fixed-wing aircraft and flown 1,200 meters above ground level (AGL).

A pulse repetition frequency (PRF) of 71 kHz with at least 100% overlap (minimum 50% side-lap) was used. Greater than 8 points per square meter and near nadir scan angles were used to increase

penetration of vegetation to ground surfaces. Spot spacing was less than or equal to 34 centimeters. Ground level GPS and aircraft IMU were collected during the flight.

Process Step 2

CC ID: 1134286
Description:

Processing.

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 REALM survey suite and PosPac 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 REALM 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 specifications.

Process Step 3

CC ID: 1134287
Description:

The NOAA Office for Coastal Management (OCM) downloaded topographic files in .txt format from PSLC's website. The files contained lidar elevation, intensity, return number, class, scan angle and GPS time

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. The All-Return ASCII txt files were parsed to convert GPS Week Time to Adjusted Standard GPS Time.

2. The All-Return ASCII files were converted from txt format to las format using LASTools' txt2las tool.

3. The las tile 46123_g2_se_cc was found to have a corrupt bounding box. The bounding box was fixed (1500x1500m) using LASTools' lastile tool in conjunction with lasmerge.

4. The las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid03.

5. The las files' vertical units were converted from feet to meters.

6. The las files were converted from a Projected Coordinate System (WA SP South) to a Geographic Coordinate system (NAD83).

7. The las files' horizontal units were converted from feet to decimal degrees.

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

Catalog Details

Catalog Item ID: 50152
GUID: gov.noaa.nmfs.inport:50152
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