2006 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Eastern Washington and River Corridors

Watershed Sciences, Inc. (WS) collected Light Detection and Ranging (LiDAR) data in eastern Washington,

eastern Oregon, and southern Canada in October and November, 2006 for the Puget Sound LiDAR Consortium.

The survey areas cover portions of the lower Okanogan River in Washington, the Methow River in

Washington, Lake Roosevelt in Washington, the Wenatchee River in Washington, and the John Day

River in Oregon. The upper Okanogan River area, in Canada, was excluded from this project the data

does not lie in borders of the United States.

The total delivered acreage for the study areas shown above is >26,000 acres greater than the original

amount, due to buffering of the original study areas and flight planning optimization.

Collection dates for the project areas:

----- Lower Okanogan (WA) 20060506 ----- Methow (WA) 20061108-20061109 -----

Lake Roosevelt (WA) 20061016-20061020 & 20061029-20061101 ----- John Day River (OR)

20061005-20061007 ----- Wenatchee (WA) 20061012-20061013 & 20061025-20061028 -----

Provide high resolution terrain elevation and land cover elevation data.

10797

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2596/supplemental/wa2006_pslc_rivercorridors_m2596.kmz

Reports explaining collection and quality assurance is available at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2596/supplemental/wa2006_pslc_rivercorridors_m2596_lidarreport.pdf

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

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

of Watershed Sciences, 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=2596

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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may no longer represent actual surface conditions.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.

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

Horizontal positional accuracy for LiDAR is dependent upon the quality of

the GPS/INS solution, sensor calibration and ground conditions at the time of data capture.

The standard system results for horizontal accuracy are less than 1 meter. Not reported, assumed as 1.0 m.

; Quantitative Value: 1.0 meters, Test that produced the value: See LiDAR data report.

LiDAR survey datasets are referenced to 1-Hz static ground GPS data collected over presurveyed

monuments with known coordinates. While surveying, the aircraft collects 2 Hz kinematic

GPS data. The onboard inertial measurement unit (IMU) collects 200 Hz aircraft attitude

data. Waypoint GPS v.7.60 and REALM are used to process the kinematic corrections for the

aircraft. The static and kinematic GPS data are then post-processed after the survey to

obtain an accurate GPS solution and aircraft positions. IPAS v.1.0 and POSPAC are used to

develop a trajectory file that includes corrected aircraft position and attitude information.

The trajectory data for the entire flight survey session are incorporated into a final

smoothed best estimate trajectory (SBET) file that contains accurate and continuous

aircraft positions and attitudes.

RTK GPS measurements were taken throughout all study areas and are compared to LiDAR point data in

each study area. The root mean square error (RMSE) is reported for each study area, along with 1-

and 2-sigma absolute deviation values available in report at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2596/supplemental/wa2006_pslc_rivercorridors.pdf

; Quantitative Value: 0.12 meters, Test that produced the value:

Accuracies averaged to 0.12 m.

2 sigma standard deviations absolute accuracy calculated as 0.16 meters in Lower Okanogan,

0.16 m in the Methow area, 0.09 m in the Lake Roosevelt area, 0.06 m in the Wenatchee

study area and 0.14 m in the John Day study area.

(Upper Okanogan study area accuracy 0.11 m at 2 sigma std dev)

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 60% sidelap, there are minimal 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 1:2000 scale.