2012 USGS Lidar: Juneau (AK)
OCM Partners
Data Set
(DS)
| ID: 49625
| Published / External
Created: 2017-11-15
|
Last Modified: 2022-08-09
Project (PRJ) | ID: 49401
ID: 49625
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | 2012 USGS Lidar: Juneau (AK) |
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Short Name | ak2012_usgs_juneau_m5021_metadata |
* Status | Completed |
Creation Date | |
Revision Date | |
• Publication Date | 2016-03-11 |
* » Abstract |
This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for Juneau, Alaska. LiDAR data, and derivative products produced in compliance with this task order are part of the data to be obtained under Contract number G10PC00025, Order number G12PD00481. Specifications listed below are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 13. |
* Purpose |
USGS has a requirement for LiDAR data in Juneau, Alaska and vicinity. Data is to be collected at a nominal pulse spacing (NPS) of 1.0 meters or less. The Juneau, Alaska LiDAR Acquisition project is to provide high accuracy bare-earth processed LiDAR data suitable for the project area. The project consisted of acquisition, post-processing, classification of LiDAR data, and creation of final deliverable products. All areas shall be collected at a nominal pulse spacing (NPS) of 1.0 meters or less based on UTM 8, related to the North American Datum of 1983. Vertical accuracy was to achieve a RMSE Z of 12.5 cm (95% confidence level of less than 24.5 cm) or better in the "Open Terrain" land cover category for all areas. Accuracy statement is based on areas of moderate to flat terrain. Diminished accuracies are to be expected in areas in dense vegetation. The accuracy of the LiDAR data as tested met or exceeded the vertical accuracy requirements, however, derived products may be less accurate in areas of dense vegetation due to a lesser number of points defining the bare-earth in such areas. |
Notes |
10269 |
Other Citation Details | |
• Supplemental Information |
A full report for this project is available at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/5021/supplemental/ak2012_usgs_juneau_m5021_lidarreport.pdf A quality report for this project is available at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/5021/supplemental/ak2012_usgs_juneau_m5021_qualityreport.pdf A footprint of this data set may be viewed in Google Earth at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/5021/supplemental/ak2012_usgs_juneau_m5021.kmz |
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Keywords
Theme Keywords
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ISO 19115 Topic Category | elevation |
None | Ground |
None | Terrain |
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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 | Unknown |
Maintenance Note | |
» Data Presentation Form | las |
• Entity Attribute Overview |
LAS 1.2 format (classes 1,2,7,9,10) |
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 Aero-Metric, INC., USGS, NOAA, the Office for Coastal Management or its partners. |
Data Set Credit |
Support Roles
* » Support Role | Data Steward |
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* » Date Effective From | 2016-03-11 |
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 | Distributor |
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* » Date Effective From | 2016-03-11 |
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 |
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Contact Instructions |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2016-03-11 |
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 | 2016-03-11 |
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 | Publication Date |
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Extent Group 1
Extent Description |
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Extent Group 1 / Geographic Area 1
* » W° Bound | -134.84996 |
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* » E° Bound | -134.26305 |
* » N° Bound | 58.54946 |
* » S° Bound | 58.21335 |
* » 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 | 2012-04-25 |
End | 2012-06-22 |
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Spatial Information
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Access Information
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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=5021 The data set is dynamically generated based on user-specified parameters.; |
• » 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=5021 |
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/geoid12b/5021/index.html |
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File Name | Bulk Download |
Description |
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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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/geoid12b/5021/supplemental/ak2012_usgs_juneau_m5021.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 2012 USGS lidar project for Juneau (AK). |
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Activity Log
Activity Time | 2016-05-23 |
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Date that the source FGDC record was last modified. |
Activity Time | 2017-11-14 |
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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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Technical Environment
Description |
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Data Quality
Representativeness | |
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Accuracy |
The vertical accuracy assessment of the data has a project requirement to achieve a Fundamental Vertical Accuracy (FVA) of 24.5 cm 95% confidence level, a requirement to achieve a Consolidated Vertical Accuracy (CVA) of 36.3 cm 95th Percentile and a target value for Supplemental Vertical Accuracies (SVA) of 36.3 cm 95th Percentile. The FVA of the LAS Swath Data achieved 20.9 cm at a 95% confidence level with an RMSE of 10.7 cm utilizing (29) ground survey check points in the evaluation. The SVA results in Short Grass achieved 15.6 cm at the 95th Percentile where (30) checkpoints were used in the evaluation. The SVA results Brush achieved 32.2 cm at the 95th Percentile where (80) checkpoints were used in the evaluation. The SVA results Trees achieved 25.2 cm at the 95th Percentile where (92) checkpoints were used in the evaluation. The SVA results Urban achieved 13.8 cm at the 95th Percentile where (252) checkpoints were used in the evaluation. The CVA results for all Land Cover Classes combined achieved 21.8 cm at the 95th Percentile where (483) checkpoints were evaluated. An additional (20) ground control check points are held in reserve and supplied to the client. |
Analytical Accuracy | |
Horizontal Positional Accuracy |
Area data products collected with the Optech Gemini were acquired at or below 1500 meters above mean terrain (AMT) and have a horizontal accuracy of 0.30 meters (per manufacturers system specifications), with a nominal point spacing of 1.0 meters.; Quantitative Value: 0.3 meters, Test that produced the value: 30 cm per manufacturer system specifications |
Vertical Positional Accuracy |
The FVA of the LAS Swath Data achieved 20.9 cm at a 95% confidence level with an RMSE of 10.7 cm utilizing (29) ground survey check points in the evaluation.; Quantitative Value: 0.107 meters, Test that produced the value: RMSE of 0.107 m (10.7 cm) |
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Completeness Report |
Complete |
Conceptual Consistency |
None |
» Quality Control Procedures Employed |
Data Management
» Have Resources for Management of these Data Been Identified? | |
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» Approximate Percentage of Budget for these Data Devoted to Data Management | |
» 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 |
The LiDAR data was captured using AeroMetric's twin-engine fixed wing aircraft equipped with an Optech LiDAR system. The LiDAR systems includes a differential GPS unit and inertial measurement system to provide superior accuracy. Acquisition parameters: 1. Flight Height - 1500 meters or lower above mean terrain 2. Swath Width - 28 degrees 3. Sidelap - 55% 4. Nominal Post Spacing - 1.0 meters GPS and IMU processing parameters 1. Maximum baseline length - Not greater than 100 kilometers. 2. Number of base stations during LiDAR collection - A minimum of 1. 3. Maximum positional RMS of trajectory during LiDAR collection - 0.10 meters 4. IMU processing monitored for consistency and smoothness - Yes. Point Cloud Processing: 1. Horizontal Datum - NAD83 2. Horizontal Coordinates - Universal Transverse Mercator, Zone 8, in meters. 3. Vertical Datum - NAVD88 4. Geoid Model used to reduce satellite derived elevations to orthometric heights - NGS Geoid09. LiDAR Processing: 1. Point Cloud data is imported to TerraScan in a Microstation V8 (V) CAD environment on a specified 1500 meter by 1500 meter tiling scheme. 2. Analyze the data for overall completeness and consistency. This is to ensure that there are no voids in the data collection. 3. Inspect for calibration errors in the dataset using the TerraMatch software. This is accomplished by sampling the data collected across all flight lines and classify the individual lines to ground. The software will use the ground-classified lines to compute corrections (Heading, Pitch, Roll, and Scale). 4. Orientation corrections (i.e. Calibration corrections) are then applied (if needed) to the entire dataset. 5. Automatic ground classification is performed using algorithms with customized parameters to best fit the project area. Several areas of varying relief and planimetric features were inspected to verify the final ground surface. 6. AeroMetric, Inc. provided Quality Assurance and Quality Control (QA/QC) data for this project. AeroMetric captured QA/QC points in 'open terrain' land cover category that were used to test the accuracy of the LiDAR ground surface. TerraScan's Output Control Report (OCR) was used to compare the QA/QC data to the LiDAR data. This routine searches the LiDAR dataset by X and Y coordinate, finds the closest LiDAR point and compares the vertical (Z) values to the known data collected in the field. Based on the QA/QC data, a bias adjustment was determined, and the results were applied (if necessary) to the LiDAR data. A final OCR was performed with a resulting RMSE of 10.7 cm for the project. 7. After the LiDAR data is finalized for vertical placement, a macro is run via TerraScan to output a dataset generated on a per swath basis as part of the final deliverables. All points of the swath are reclassified to class 0 during this step. 8. Each tile is reviewed for accuracy and consistency of the macro ground classification. During this phase, MicroStation is used to generate line work representing water bodies and rivers. Separate line work is also placed in instances where overpasses have blocked enough valid ground returns or water gave too few ground returns to reasonably portray the ground surface. A proprietary in-house software program is then run to drape the river line work in a flowing fashion. Contours are generated on the river breaklines to review monotonicity of the draped line work. 9. Once the automatic processing and the testing of LiDAR is complete, AeroMetric meticulously reviews the generated bare-earth surface data to ensure that proper classification was achieved as part of a Quality Control process. 10. Final deliverables are generated and output to a client specified 1500 meter by 1500 meter tiling scheme. |
Process Date/Time | 2012-10-01 00:00:00 |
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Process Step Number | 2 |
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» Description |
The NOAA Office for Coastal Management (OCM) received the files in laz format via an FTP online repository. The files contained lidar elevation and intensity measurements. The data were in UTM Zone 8, NAVD88 (orthometric) heights in meters. OCM performed the following processing for data storage and Digital Coast provisioning purposes: 1. The data were converted from UTM coordinates to geographic coordinates. 2. The data were converted from NAVD88 (orthometric) heights in meters to GRS80 (ellipsoid) heights in meters using Geoid 09. 3. The LAS data were sorted by latitude and the headers were updated. 4. Erroneous elevations were removed. |
Process Date/Time | 2016-03-01 00:00:00 |
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Acquisition Information
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Catalog Details
Catalog Item ID | 49625 |
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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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