2009 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Lewis County, Washington

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.

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2520/supplemental/wa2009_pslc_lewis.KMZ

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2520/supplemental/Lewis_County_Data_Report_Delivery_2009.pdf

LiDAR points in LAZ format

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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.

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

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2520

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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

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

There are no other attribute tables.

See LiDAR data report.

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.

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

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.