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Short Citation:
OCM Partners, 2022: 2006 U.S. Geological Survey (USGS) Bare Earth Topographic LiDAR: North Puget Sound, Washington, https://www.fisheries.noaa.gov/inport/item/49602.

Item Identification

Title: 2006 U.S. Geological Survey (USGS) Bare Earth Topographic LiDAR: North Puget Sound, Washington
Short Name: 2006_northpugetsound_m1451_metadata
Status: Completed
Publication Date: 2013-01
Abstract:

USGS Contract Number: 01CRCN0014

In Spring, 2006 Sanborn was contracted by the USGS to survey aprocimately 1,735 square miles of western Whatcom and Skagit Counties in Washington state. All data was collected during ideal conditions (rivers at or below mean level,

leaf off, etc.).

For this collect two sensors were used: The Leica ALS-50 (High Relief Collection) and Optech 2050 (High and Low Relief Collection). LiDAR calibrations were performed to determine and therefore eliminate systematic

biases that occur between the the two sensors. Once the biases were determined they were modeled out. The Leica ALS-50 produced an average point spacing of 1.4 meters. The Optech 2050 produced an average point spacing

of 1.3 meters. All points are classified as Class 2 (Ground) which includes water points and any possibly remaining artifacts.

Leica ALS-50 LiDAR Acquisition Paramters:

Avg. Altitude: 1,500 meters AGL

Airspeed: ~120 Knots

Scan Freq: 36 Hertz

Scan Width Half Angle: 36 Degrees

Pulse Rate: 60,000 Hertz

Overlap: 44-60%

Optech 2050 LiDAR Acquisition Parameters:

Avg. Altitude: 1,200 meters AGL

Airspeed: ~120 Knots

Scan Freq: 30 Hertz

Scan Width Half Angle: 40 Degrees

Pulse Rate: 50,000 Hertz

Overlap: 30-50%

Purpose:

This LiDAR operation was designed to provide a highly detailed ground surface dataset to be used for the development of topographic mapping, contour mapping and

hydraulic modeling.

Notes:

10246

Supplemental Information:

The third-party QA report for this data set may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1451/supplemental/2006_NorthPugetSound_lidar_Task_Order.pdf

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1451/supplemental/2006_NorthPugetSound_lidar_geo_footprint.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation

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 LAS 1.1 format

Entity Attribute Detail Citation:

none

Distribution Liability:

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

of Photo Science, NOAA, GADNR, the Office for Coastal Management or its partners.

Data Set Credit: Sanborn acquired and post-processed the LiDAR for North Puget Sound.

Support Roles

Data Steward

CC ID: 669474
Date Effective From: 2013-01
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: 669476
Date Effective From: 2013-01
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: 669477
Date Effective From: 2013-01
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: 669475
Date Effective From: 2013-01
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: 1133467
W° Bound: -85.215673
E° Bound: -83.90863
N° Bound: 34.576794
S° Bound: 32.854996

Extent Group 1 / Time Frame 1

CC ID: 1133466
Time Frame Type: Range
Start: 2006-05-05
End: 2006-09-03

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=1451

;

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: 740272
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1451
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: 740273
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1451/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 740275
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 740276
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 740277
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1451/supplemental/2006_NorthPugetSound_lidar_geo_footprint.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for the North Puget Sound in Washington.

Activity Log

Activity Log 1

CC ID: 669494
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 669493
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: 718023
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 740274
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

The USGS task order required a a vertical bare earth accuracy of 18.5cm @ 95% confidence, a 1m horizontal RMS @ 95% confidence, and

no data voids due to system malfunctions of lack of overlap. The project did not meet the specifications for vertical accuracy or

data voids.

Horizontal Positional Accuracy:

The LiDAR data was compiled to meet a 1 meter horizontal accuracy. The calibration of

the LiDAR sensor itself and the calibration process of the data produced by this sensor ensure

that this accuracy is met.

; Quantitative Value: 1 meters, Test that produced the value: Value stated as RMSE @ 95% confidence in meters

Vertical Positional Accuracy:

The LiDAR data was tested by Sanborn for vertical accuracy. Sanborn collected

a total of 60 ground control points for use in verifying the vertical accuracy of the classified LiDAR data in North Puget Sound.

Only 45 ground control points proved valid. These points were tested against the classified LiDAR data.

; Quantitative Value: 0.55 meters, Test that produced the value: RMSEz in meters

Completeness Report:

Datasets contain complete coverage of tiles except where previously discussed.

Conceptual Consistency:

Deliverables were tested by Sanborn for vertical accuracy and consistency. There are two small unsurveyed areas near the North Fork Nooksack River.

There are three areas of sparse returns located along Finney Creek south of Concrete, near Marblemount and along the Skagit River near Ross Dam.

Lineage

Process Steps

Process Step 1

CC ID: 1133463
Description:

Final post-processing of LiDAR data involves several steps. The airborne GPS

data was post-processed using Waypoint's GravNAVTM software (version 7.5). A

fixed-bias carrier phase solution was computed in both the forward and reverse

chronological directions. The data was processed for both base stations and

combined. In the event that the solution worsened as a result of the combination of

both solutions the best of both solutions was used to yield more accurate data.

The GPS trajectory was combined with the raw IMU data and post-processed

using Applanix Inc.'s POSPROC (version 4.3) Kalman Filtering software. This

results in a two-fold improvement in the attitude accuracies over the real-time INS

data. The best estimated trajectory (BET) and refined attitude data are then reintroduced

into the LEICA ALS post processor or REALM Survey Suite OPTECH to

compute the laser point-positions. The trajectory is then combined with the attitude

data and laser range measurements to produce the 3-dimensional coordinates of

the mass points.

All return values are produced within ALS Post Processing software or REALM

Survey Suite OPTECH software. The multi-return information minus the last return

provides a useful depiction of the "canopy" within the project area. The last return

is further processed to obtain the "Bare Earth Dataset" as a deliverable. All LiDAR

data is processed using the binary LAS format 1.0 file format.

LiDAR filtering was accomplished using TerraSolid, TerraScan LiDAR processing

and modeling software. The filtering process reclassifies all the data into classes

within the LAS formatted file based scheme set using the LAS format 1.0

specifications or by the client. Once the data is classified, the entire data set is

reviewed and manually edited for anomalies that are outside the required

guidelines of the product specification or contract guidelines, whichever apply.

The coordinate and datum transformations were then applied to the data set to

reflect the required deliverable projection, coordinate and datum systems as

provided in the contract. The final data is in State Plane Washington North

Coordinate System with the horizontal and vertical units being in feet.

Process Date/Time: 2006-01-01 00:00:00

Process Step 2

CC ID: 1133464
Description:

The NOAA Office for Coastal Management (OCM) received topographic file in ASCII .XYZ format. The files contained lidar

elevation measurements. The data were received in Washington State Plane North Zone 4601, NAD83 coordinates

and were vertically referenced to NAVD88 using the Geoid99 model. The vertical units of the data were

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

1. The ASCII .XYZ files were converted to LAS version 1.1 using Global Mapper.

2. All points in Class 0 (Never Classified) were changed to Class 2 (Ground). This includes water points.

3. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid99.

4. The topographic las files were converted from a Projected Coordinate System (WA SP North) to a Geographic Coordinate system (GCS).

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

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

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

Catalog Details

Catalog Item ID: 49602
GUID: gov.noaa.nmfs.inport:49602
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:21+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