49602
2006 U.S. Geological Survey (USGS) Bare Earth Topographic LiDAR: North Puget Sound, Washington
2006_northpugetsound_m1451_metadata
Data Set
Published / External
49401
Lidar - partner (no harvest)
Project
Completed
2013-01
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%
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.
10246
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
Theme
ISO 19115 Topic Category
elevation
Office for Coastal Management
Charleston
SC
Data Set
As Needed
las
LiDAR points in LAS 1.1 format
none
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.
Sanborn acquired and post-processed the LiDAR for North Puget Sound.
Data Steward
2013-01
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2013-01
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2013-01
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2013-01
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Ground Condition
-85.215673
-83.90863
34.576794
32.854996
Range
2006-05-05
2006-09-03
Yes
Unclassified
This data can be obtained on-line at the following URL:
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1451
;
None
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.
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1451
Customized Download
Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1451/index.html
Bulk Download
Simple download of data files.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1451/supplemental/2006_NorthPugetSound_lidar_geo_footprint.kmz
Browse Graphic
Browse Graphic
kmz
This graphic shows the lidar coverage for the North Puget Sound in Washington.
https://coast.noaa.gov
Online Resource
https://coast.noaa.gov/dataviewer
Online Resource
2016-05-23
Date that the source FGDC record was last modified.
2017-11-14
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.
2018-02-08
Partial upload of Positional Accuracy fields only.
2018-03-13
Partial upload to move data access links to Distribution Info.
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.
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
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
Datasets contain complete coverage of tiles except where previously discussed.
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.
1
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.
2006-01-01T00:00:00
2
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.
2013-01-01T00:00:00
gov.noaa.nmfs.inport:49602
Anne Ball
2017-11-15T15:21:07
SysAdmin InPortAdmin
2022-08-09T17:11:36
2022-03-16
OCM Partners
OCMP
1002
Public
No
2022-03-16
1 Year
2023-03-16