2006 U.S. Geological Survey (USGS) Bare Earth Topographic LiDAR: North Puget Sound, Washington
OCM Partners
Data Set
(DS)
| ID: 49602
| Published / External
Created: 2017-11-15
|
Last Modified: 2022-08-09
Project (PRJ) | ID: 49401
ID: 49602
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | 2006 U.S. Geological Survey (USGS) Bare Earth Topographic LiDAR: North Puget Sound, Washington |
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Short Name | 2006_northpugetsound_m1451_metadata |
* Status | Completed |
Creation Date | |
Revision Date | |
• 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 |
Other Citation Details | |
• 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 |
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Keywords
Theme Keywords
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ISO 19115 Topic Category | elevation |
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Physical Location
• » Organization | Office for Coastal Management |
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• » City | Charleston |
• » State/Province | SC |
• Country | |
• » Location Description |
Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | |
• Maintenance Frequency | As Needed |
Maintenance Note | |
» Data Presentation Form | las |
• Entity Attribute Overview |
LiDAR points in LAS 1.1 format |
Entity Attribute Detail Citation |
none |
Entity Attribute Detail URL | |
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
* » Support Role | Data Steward |
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* » Date Effective From | 2013-01 |
Date Effective To | |
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 |
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Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Distributor |
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* » Date Effective From | 2013-01 |
Date Effective To | |
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 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2013-01 |
Date Effective To | |
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 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Point of Contact |
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* » Date Effective From | 2013-01 |
Date Effective To | |
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 |
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URL | https://coast.noaa.gov |
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Extents
Currentness Reference | Ground Condition |
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Extent Group 1
Extent Description |
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Extent Group 1 / Geographic Area 1
* » W° Bound | -85.215673 |
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* » E° Bound | -83.90863 |
* » N° Bound | 34.576794 |
* » S° Bound | 32.854996 |
* » Description |
Extent Group 1 / Vertical Extent
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Extent Group 1 / Time Frame 1
* » Time Frame Type | Range |
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* » Start | 2006-05-05 |
End | 2006-09-03 |
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Spatial Information
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Vector Representation Used? | Yes |
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Access Information
Data License | |
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Data License URL | |
Data License Statement | |
* » Security Class | Unclassified |
* Security Classification System | |
Security Handling Description | |
• Data Access Policy | |
» 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. |
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Distribution Information
Start Date | |
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» 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. |
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» Download URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1451/index.html |
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File Name | Bulk Download |
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Simple download of data files. |
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URLs
URL | https://coast.noaa.gov/dataviewer |
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URL Type | Online Resource |
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Description |
URL | https://coast.noaa.gov |
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URL Type | Online Resource |
File Resource Format | |
Description |
URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1451/supplemental/2006_NorthPugetSound_lidar_geo_footprint.kmz |
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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. |
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Activity Log
Activity Time | 2016-05-23 |
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Description |
Date that the source FGDC record was last modified. |
Activity Time | 2017-11-14 |
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Responsible Party | |
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 Time | 2018-02-08 |
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Description |
Partial upload of Positional Accuracy fields only. |
Activity Time | 2018-03-13 |
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Partial upload to move data access links to Distribution Info. |
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Issues
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Technical Environment
Description |
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Data Quality
Representativeness | |
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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. |
Analytical Accuracy | |
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 |
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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. |
» Quality Control Procedures Employed |
Data Management
» Have Resources for Management of these Data Been Identified? | |
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» Do these Data Comply with the Data Access Directive? | |
» Is Access to the Data Limited Based on an Approved Waiver? | |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed |
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» Actual or Planned Long-Term Data Archive Location | |
» If World Data Center or Other, Specify | |
» If To Be Determined, Unable to Archive, or No Archiving Intended, Explain |
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» Approximate Delay Between Data Collection and Archiving | |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
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Process Steps
Process Step Number | 1 |
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» 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 |
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Process Step Number | 2 |
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» 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 |
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Acquisition Information
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Child Items
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Catalog Details
Catalog Item ID | 49602 |
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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 Workflow State | Published / External |
Metadata Last Review Date | 2022-03-16 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2023-03-16 |
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