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Short Citation:
OCM Partners, 2022: 2010 ARRA Lidar: Eklutna Glacier (AK), https://www.fisheries.noaa.gov/inport/item/49623.

Item Identification

Title: 2010 ARRA Lidar: Eklutna Glacier (AK)
Short Name: ak2010_arra_eklutna_m4798_metadata
Status: Completed
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

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

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Ground
None Terrain

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: Unknown
Data Presentation Form: las
Entity Attribute Overview:

LAS 1.2 format (classes 1,2,7,9,10)

Entity Attribute Detail Citation:

none

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.

Support Roles

Data Steward

CC ID: 670297
Date Effective From: 2015-02-09
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: 670299
Date Effective From: 2015-02-09
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: 670300
Date Effective From: 2015-02-09
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: 670298
Date Effective From: 2015-02-09
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: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1136381
W° Bound: -149.10809
E° Bound: -148.76331
N° Bound: 61.3277
S° Bound: 61.11853

Extent Group 1 / Time Frame 1

CC ID: 1136380
Time Frame Type: Discrete
Start: 2010-10-23

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=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.

Distribution Information

Distribution 1

CC ID: 740394
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.

Distribution 2

CC ID: 740395
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.

URLs

URL 1

CC ID: 740397
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 740398
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 740399
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.

Activity Log

Activity Log 1

CC ID: 670316
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 670315
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: 718163
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 740396
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

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.

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.

Completeness Report:

Complete

Conceptual Consistency:

None

Lineage

Process Steps

Process Step 1

CC ID: 1136377
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 Step 2

CC ID: 1136378
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

Catalog Details

Catalog Item ID: 49623
GUID: gov.noaa.nmfs.inport: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 Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16