2010 ARRA Lidar: Eklutna Glacier (AK)

OCM Partners
Data Set (DS) | ID: 49623 | Published / External
Created: 2017-11-15   |   Last Modified: 2022-08-09

Parent: Lidar - partner (no harvest)
Project (PRJ) | ID: 49401

ID: 49623
Data Set (DS)

* Discovery
• First Pass
» Metadata Rubric

Item Identification

* » Title 2010 ARRA Lidar: Eklutna Glacier (AK)
Short Name ak2010_arra_eklutna_m4798_metadata
* Status Completed
Creation Date  
Revision Date  
• Publication Date 2015-02-09
* » Abstract

This task order is for planning, acquisition, processing, and derivative products of lidar data to be collected for an area over Eklutna Glacier in the Chugach Mountains of Alaska. Lidar data, and derivative products produced in compliance with this task order are part of the data to be obtained under the American Recovery and Reinvestment Act degrees (ARRA) of 2009. Specifications listed below are based on the US Geological Survey National Geospatial Program Base Lidar Specification, Version 12.
* Purpose

The Eklutna Glacier LiDAR project was carried out to provide high accuracy bare-earth processed LiDAR data suitable for the approximately 160 square miles of the project area. This delivery includes classified LiDAR data in LAS 1.2 format. The following classification scheme is utilized:

Class 1: Default - processed points, but unclassified

Class 2: Ground

Class 7: Noise

Class 9: Water

Class 10: Ignored Ground (breakline proximity)

The project consisted of acquisition, post-processing, and classification of LiDAR data. The LiDAR data was collected at a nominal point spacing of 1.939 meters throughout the project area. Vertical accuracy was to achieve a RMSE Z of 15cm (95% confidence level of less than 30cm) or better in the "Open Terrain" land cover category.

Accuracy statement is based on the area 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 the vertical accuracy or better, however, derived products may be less accurate in areas of dense vegetation due to a lesser number of points defining the bare-earth in these areas.
Notes

10267
Other Citation Details
• Supplemental Information

A report for this project is available at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/4798/supplemental/ak2010_ARRA_Eklutna_m4798_surveyreport.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/4798/supplemental/ak2010_ARRA_Eklutna_m4798.kmz
DOI (Digital Object Identifier)  
DOI Registration Authority  
DOI Issue Date  

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category elevation
None Ground
None Terrain
   
   
   

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* Spatial Keywords

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Platform Keywords

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Physical Location

• » Organization Office for Coastal Management
• » City Charleston
• » State/Province SC
• Country  
• » Location Description

Data Set Information

* Data Set Scope Code Data Set
• 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

» At least one Distributor Org, one Metadata Contact, one Point of Contact, and one Data Steward should be listed.
* » Support Role Data Steward
* » Date Effective From 2015-02-09
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
* » Date Effective From 2015-02-09
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
* » Date Effective From 2015-02-09
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
* » Date Effective From 2015-02-09
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
* » Date Effective From
Date Effective To
* » Contact
* Contact Instructions
* » Support Role
* » Date Effective From
Date Effective To
* » Contact
* Contact Instructions
* » Support Role
* » Date Effective From
Date Effective To
* » Contact
* Contact Instructions

Extents

Currentness Reference Publication Date

Extent Group 1

Extent Description

Extent Group 1 / Geographic Area 1

* » W° Bound -149.10809
* » E° Bound -148.76331
* » N° Bound 61.3277
* » S° Bound 61.11853
* » Description

Extent Group 1 / Vertical Extent

EPSG Code
Vertical Minimum
Vertical Maximum

Extent Group 1 / Time Frame 1

* » Time Frame Type Discrete
* » Start 2010-10-23
End  
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Alternate End As Of Info  
Description

Spatial Information

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Vector Representation Used? Yes
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Access Information

Data License  
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=4798

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.
Metadata Access Constraints
Metadata Use Constraints

Distribution Information

Start Date  
» Download URL https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=4798
Distributor
File Name Customized Download
Description

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
File Date/Time  
File Type (Deprecated)  
Distribution Format  
File Size  
Application Version  
Compression  
Review Status  
Start Date  
» Download URL https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/4798/index.html
Distributor
File Name Bulk Download
Description

Simple download of data files.
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Archive Information

Location
File Identifier
File Name
URL
Description
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URL
Description
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URLs

URL https://coast.noaa.gov/dataviewer
Name  
URL Type Online Resource
File Resource Format  
Description
URL https://coast.noaa.gov
Name  
URL Type Online Resource
File Resource Format  
Description
URL https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/4798/supplemental/ak2010_ARRA_Eklutna_m4798.kmz
Name Browse Graphic
URL Type Browse Graphic
File Resource Format kmz
Description

This graphic shows the lidar coverage for the 2010 ARRA lidar project covering the Eklutna Glacier.
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Activity Log

Activity Time 2016-05-23
Activity Type  
Responsible Party  
Description

Date that the source FGDC record was last modified.
Activity Time 2017-11-14
Activity Type  
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
Activity Type  
Responsible Party  
Description

Partial upload of Positional Accuracy fields only.
Activity Time 2018-03-13
Activity Type  
Responsible Party  
Description

Partial upload to move data access links to Distribution Info.
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Issues

Issue Date
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Technical Environment

Description  
 

Data Quality

Representativeness
Accuracy

The Fundamental Vertical Accuracy (FVA) of the Classified Bare Earth files achieved an RMSE of 0.109 meters. These results are based on profile data collected in open areas over relatively level terrain.
Analytical Accuracy
Horizontal Positional Accuracy

All these data products were acquired at 3000 meters above mean terrain (AMT) and have a horizontal accuracy of 0.97 meters with a nominal point spacing of 1.939 meters per manufacturer's specifications, not field verified.; Quantitative Value: 1 meters, Test that produced the value: 1 m, not tested
Vertical Positional Accuracy

The Fundamental Vertical Accuracy (FVA) of the Classified Bare Earth for this project achieved an RMSE of 0.109 meters at a 95% confidence level in the "Open Terrain" land cover category. A total of 445 QC points were used in assessing this project's vertical accuracy. ; Quantitative Value: 0.109 meters, Test that produced the value: 0.109 m RMSE. The Fundamental Vertical Accuracy (FVA) of the Classified Bare Earth for this project achieved an RMSE of 10.9 cm at a 95% confidence level in the "Open Terrain" land cover category. A total of 445 QC points were used in assessing this project's vertical accuracy.
Quantitation Limits
Bias
Comparability
Completeness Measure
Precision
Analytical Precision
Field Precision
Sensitivity
Detection Limit
Completeness Report

Complete
Conceptual Consistency

None
» Quality Control Procedures Employed

Data Management

» Have Resources for Management of these Data Been Identified?  
» 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  
 
» 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  
 
» 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?  
 

Lineage

» Lineage Statement

Sources

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Process Steps

Process Step Number 1
» Description

The LiDAR data was captured using AERO-METRIC's twin-engine, fixed wing aircraft equipped with a LiDAR system. The LiDAR system includes a differential GPS unit and inertial measurement system to provide superior accuracy.

Acquisition parameters:

1. Scanner - Optech ALTM Gemini

2. Flight Height - 3000m above mean terrain

3. Scan Angle - 15 degrees

4. Sidelap - 40% for both areas

5. Nominal Post Spacing - 1.939 meters

GPS and IMU processing parameters:

1. Processing Programs and version - Applanix - POSGPS and POSProc, versions 4.4

2. Maximum baseline length - Not greater than 40km.

3. IMU processing monitored for consistency and smoothness - Yes.

Point Cloud Processing:

1. Program and version - Optech LMS

2. Horizontal Datum - NAD83(CORS96)

3. Horizontal Coordinates - Universal Transverse Mercator, Zone 6, in Meters.

4. Vertical Datum - NAVD88

5. Geoid Model used to reduce ellipsoid heights to orthometric elevations - NGS Geoid09.

LIDAR Processing:

1. Processing Programs and versions - TerraSolid TerraScan (version 009.004), TerraModeler (version 009.001 and TerraMatch (version 009.001) and Intergraph MicroStation (version.08.01.02.15).

2. Point Cloud data is imported to TerraScan in a Microstation V8 (V) CAD environment on a specified 5000 foot by 5000 foot tiling scheme.

3. Analyze the data for overall completeness and consistency. This is to ensure that there are no voids in the data collection.

4. Inspect for calibration errors in the dataset using the TerraMatch software. This is accomplished by sampling the data collected across all flight lines and classifying the individual lines to ground. The software will use the ground-classified lines to compute corrections (Heading, Pitch, Roll, and Scale).

5. Orientation corrections (i.e. Calibration corrections) are then applied (if needed) to the entire dataset.

6. 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.

7. AERO-METRIC, INC. provided Quality Assurance and Quality Control (QAQC) data for this project. AERO-METRIC 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 QAQC 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 QAQC data, a bias adjustment was determined, and the results were applied to the LIDAR data. A final OCR was performed with a resulting RMSE of 0.10m.

8. Once the automatic processing and the testing of LiDAR is complete, AERO-METRIC meticulously reviews the generated bare-earth surface data to insure that proper classification was achieved as part of a Quality Control process.

9. Final deliverables are generated and output to a 3000m by 3000m tiling scheme in accordance with client specifications.
Process Date/Time 2010-10-28 00:00:00
Process Contact  
Phone (Voice)  
Email Address  
Source  
Process Step Number 2
» 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 6, 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 2015-01-25 00:00:00
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Acquisition Information

Instruments

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FAQs

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Catalog Details

Catalog Item ID 49623
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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