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Summary

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Short Citation
OCM Partners, 2024: 2012 Alaska Division of Geological and Geophysical Surveys (DGGS) Lidar: Whittier, Alaska, https://www.fisheries.noaa.gov/inport/item/49626.
Full Citation Examples

Abstract

In support of geologic mapping and hazards evaluation in and near Whittier, Alaska, the Division of Geological and Geophysical Surveys (DGGS)

acquired, and is making publicly available, lidar (light detection and ranging) data for an area along Passage Canal, Portage Lake, and

Portage Glacier Highway. The lidar data, acquired between 21 - Oct 25 2013, was processed by Watershed Sciences, Inc. (WSI) and consists of

continuous coverage encompassing an area extending from Portage Lake eastward to Logging Company Bay in Passage Canal in the Seward D-4,

D-5, and D-6 1:63,360-scale quadrangles.

Lidar data collected below 1,600 ft (488 m) elevation have a minimum average pulse density of 8 pulses/square meter; above 1,600 ft (488 m)

data were collected with an average pulse density of at least 4 pulses/square meter. Following lidar data collection and processing by WSI

and their survey subcontractor, McClintock Land Associates, WSI submitted the data to the State of Oregon Department of Geology and Mineral

Industries (DOGAMI) for independent quality control analysis. After addressing any concerns from DOGAMI, WSI submitted the revised dataset to

DGGS along with a technical report describing details about the lidar acquisition, accuracy, and quality. DOGAMI also provided a separate

report summarizing their methodologies and the results of quality control checks.

The following data classifications are available for download from the NOAA Digital Coast:

1 (Unclassified)

2 (Ground)

3 (Low Vegetation)

4 (Medium Vegetation)

6 (Buildings)

7 (Low Point/Noise)

9 (Water Surface)

10 (Ignored Ground - Ground points within 1 m of breaklines)

14 (Withheld - Points that have intensity values of 0 or 255)

15 (Mobile - Temporary Placed Structures (cars, boats, docks, buoys))

16 (Utilities - Man made non-habitable structures (fences, power lines))

Original contact information:

Contact Name: James Weakland

Contact Org: Alaska Division of Geological and Geophysical Surveys

Title: GIS Analyst

Phone: (907)451-5029

Email: dggsgis@alaska.gov

Distribution Information

  • Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

  • Simple download of data files.

Access Constraints:

None

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.

Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the

data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not

to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of

Natural Resources, Division of Geological and Geophysical Surveys. The State of Alaska makes no express or implied warranties

(including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic

data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental,

indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the

electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor

or anyone else exceed the fee paid for the electronic service or product.

Controlled Theme Keywords

elevation

Child Items

No Child Items for this record.

Contact Information

Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202

Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202

Extents

Geographic Area 1

-148.883498° W, -148.407257° E, 60.879156° N, 60.75784° S

Time Frame 1
2012-10-21 - 2012-10-25

Item Identification

Title: 2012 Alaska Division of Geological and Geophysical Surveys (DGGS) Lidar: Whittier, Alaska
Short Name: ak2012_whittier_m2580_metadata
Status: Completed
Publication Date: 2013
Abstract:

In support of geologic mapping and hazards evaluation in and near Whittier, Alaska, the Division of Geological and Geophysical Surveys (DGGS)

acquired, and is making publicly available, lidar (light detection and ranging) data for an area along Passage Canal, Portage Lake, and

Portage Glacier Highway. The lidar data, acquired between 21 - Oct 25 2013, was processed by Watershed Sciences, Inc. (WSI) and consists of

continuous coverage encompassing an area extending from Portage Lake eastward to Logging Company Bay in Passage Canal in the Seward D-4,

D-5, and D-6 1:63,360-scale quadrangles.

Lidar data collected below 1,600 ft (488 m) elevation have a minimum average pulse density of 8 pulses/square meter; above 1,600 ft (488 m)

data were collected with an average pulse density of at least 4 pulses/square meter. Following lidar data collection and processing by WSI

and their survey subcontractor, McClintock Land Associates, WSI submitted the data to the State of Oregon Department of Geology and Mineral

Industries (DOGAMI) for independent quality control analysis. After addressing any concerns from DOGAMI, WSI submitted the revised dataset to

DGGS along with a technical report describing details about the lidar acquisition, accuracy, and quality. DOGAMI also provided a separate

report summarizing their methodologies and the results of quality control checks.

The following data classifications are available for download from the NOAA Digital Coast:

1 (Unclassified)

2 (Ground)

3 (Low Vegetation)

4 (Medium Vegetation)

6 (Buildings)

7 (Low Point/Noise)

9 (Water Surface)

10 (Ignored Ground - Ground points within 1 m of breaklines)

14 (Withheld - Points that have intensity values of 0 or 255)

15 (Mobile - Temporary Placed Structures (cars, boats, docks, buoys))

16 (Utilities - Man made non-habitable structures (fences, power lines))

Original contact information:

Contact Name: James Weakland

Contact Org: Alaska Division of Geological and Geophysical Surveys

Title: GIS Analyst

Phone: (907)451-5029

Email: dggsgis@alaska.gov

Purpose:

In support of geologic mapping and hazards evaluation in and near Whittier, Alaska, the Division of Geological and Geophysical Surveys (DGGS)

acquired, and is making publicly available, lidar (light detection and ranging) data for an area along Passage Canal, Portage Lake, and

Portage Glacier Highway. Data will serve multiple purposes but were primarily collected to map geology and evaluate potential geologic hazards.

Steep slopes with poor access, combined with dense vegetation and a thick moss ground-cover that obscures the bedrock surface, make the use of

lidar one of the most effective ways to map the geology and evaluate unstable slopes and other hazards.

Notes:

10270

Supplemental Information:

This metadata file was written to document and describe, as a whole, all the lidar data products generated for this project. It provides

a brief overview to the data acquisition, processing, and quality control steps utilized by DGGS contractors and subcontractors. Watershed

Sciences, Inc. has associated additional metadata (via ArcGIS) with many of the distribution files. The metadata fields populated by WSI are

viewable via ArcCatalog and may include additional useful information that is specific to each individual file. However, WSI metadata has not

been reviewed by DGGS/DOGAMI to ensure accuracy and completeness. We encourage users to review the delivery and quality control reports

provided by Watershed Sciences, Inc. and DOGAMI for a comprehensive discussion of their processes.

The Quality Control Report may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/rdf2013_003_qc_report.pdf

The Delivery Report may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/rdf2013_003_delivery_report.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/2580/supplemental/2012_DGGS_Whittier_Alaska_Lidar.kmz

The appropriate citation for this infomation is:

Hubbard, T.D., Wolken, G.J., Stevens, D.S.P., and Combellick, R.A., 2013, High-resolution lidar data for the Whittier area, Passage Canal, and Portage Lake, Alaska: Alaska Division of Geological and Geophysical Surveys Raw Data File 2013-3, 5 p. http://doi.org/10.14509/24976

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Aerial Geology
None Geologic Hazards
None Geology
None Geomorphology
None Hazards
None Hillshade Image
None Point Cloud Data
None Slope Instability

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Distribution Liability:

The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with

respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's

purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages

suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or

otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic

service or product.

Any conclusions drawn from the analysis of this information are not the responsibility of Alaska DGGS, the Office for Coastal Management

or its partners.

Data Set Credit: Financial support for this work came from State of Alaska capital-project funding. The authors are grateful for support from several staff members of the Division of Geological and Geophysical Surveys. Jim Weakland helped process data and create the hillshade images; Lauren Southerland helped organize the data for distribution; Susan Seitz created the programming by which the data are offered online; Simone Montayne assisted with metadata; and Ken Woods manages data on the server.

Support Roles

Data Steward

CC ID: 670402
Date Effective From: 2013
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: 670404
Date Effective From: 2013
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: 670405
Date Effective From: 2013
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: 670403
Date Effective From: 2013
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: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1134757
W° Bound: -148.883498
E° Bound: -148.407257
N° Bound: 60.879156
S° Bound: 60.75784

Extent Group 1 / Time Frame 1

CC ID: 1134756
Time Frame Type: Range
Start: 2012-10-21
End: 2012-10-25

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=2580

This 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.

Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the

data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not

to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of

Natural Resources, Division of Geological and Geophysical Surveys. The State of Alaska makes no express or implied warranties

(including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic

data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental,

indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the

electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor

or anyone else exceed the fee paid for the electronic service or product.

Distribution Information

Distribution 1

CC ID: 740412
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2580
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: 740413
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 740415
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/2012_DGGS_Whittier_Alaska_Lidar.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for the Whittier, Alaska area.

Activity Log

Activity Log 1

CC ID: 670438
Activity Date/Time: 2017-10-10
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 670437
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: 718166
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 740414
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

LiDAR flight lines have been examined to ensure that there was at least 60% sidelap, there are no gaps between flight-lines, and overlapping

flight-lines have consistent elevation values. Shaded relief images have been visually inspected for data errors such as pits, border

artifacts, gaps, and shifting. The data was examined at a 1:2000 scale. WSI submitted the data to the State of Oregon Department of

Geology and Mineral Industries (DOGAMI) for independent quality control analysis. After addressing any concerns from DOGAMI, WSI submitted

the revised data set to DGGS along with a technical report describing details about the lidar acquisition, accuracy, and quality. DOGAMI also

provided a separate report summarizing their methodologies and the results of quality control checks. Both reports are available via the DGGS

website or at:

The Quality Control Report may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/rdf2013_003_qc_report.pdf

The Delivery Report may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/rdf2013_003_delivery_report.pdf

Horizontal Positional Accuracy:

Horizontal accuracy is regarded as a product of the lidar ground footprint. Lidar is referenced to co-acquired GPS base station data that

have accuracies far greater than the value of the lidar footprint. The ground footprint is equal to 1/3333rd of the above - ground flying

height. The ground footprint for data collected for this project exceeds typical accuracy of ground control used to reference the lidar

data (less than 0.01 meters). Project specifications require the lidar footprint to be between 0.15 and 0.40 meters. The values, tests,

and processing methods used by WSI and DOGAMI to ensure relative accuracy are described in the accompanying delivery and quality control

reports. Please see the lidar QC report at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/rdf2013_003_qc_report.pdf

Vertical Positional Accuracy:

The vertical accuracy for this data set is 2.2 cm RMSE.

Vertical accuracy was assessed by comparing GPS survey collected by McClintock Land Associates with lidar digital elevation models to expose

offsets. Quality control analysis performed by DOGAMI, indicate that the data complies with project specifications (maximum root mean square

vertical offset - 0.20 meters). Please see the lidar QC report for statistics from vertical accuracy analysis at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/rdf2013_003_qc_report.pdf

Completeness Report:

The pulse density distribution varies throughout the study area. Areas below 1,600 feet in elevation, including the City of Whittier, were

collected at a higher pulse density (greater or equal to 8 pulses/square meter), with areas above 1,600 feet in elevation collected at greater

than or equal to 4 pulses/square meter. The WSI delivery report provides additional information about the lidar pulse density and distribution.

Real time kinematic ground survey data (used for absolute vertical adjustment) is available in Appendix A of the delivery report. Aircraft

flight-lines (trajectory files) were supplied to DOGAMI for quality control but are not included as a component of this publication.

The Delivery Report may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/rdf2013_003_delivery_report.pdf

Conceptual Consistency:

Data consistency varies slightly throughout the project area with higher errors in areas of steep terrain. The tests and processing methods used

by WSI and DOGAMI to ensure data consistency are described in the accompanying delivery and quality control reports which may be accessed at:

The Quality Control Report may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/rdf2013_003_qc_report.pdf

The Delivery Report may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/rdf2013_003_delivery_report.pdf

Lineage

Process Steps

Process Step 1

CC ID: 1134749
Description:

Data acquisition and processing - This lidar dataset was collected and processed by WSI and their survey subcontractor, McClintock Land

Associates (October 21-25, 2012). WSI has provided a delivery report which outlines in detail their data acquisition procedures, processing

methods, and results of all accuracy assessments. The delivery report is available on the citation page for this publication.

Process Date/Time: 2012-01-01 00:00:00

Process Step 2

CC ID: 1134750
Description:

Quality control - WSI submitted the data to the State of Oregon Department of Geology and Mineral Industries (DOGAMI) for independent

quality control analysis. After addressing any concerns from DOGAMI, WSI submitted the revised data set to DGGS along with a technical

report describing details about the lidar acquisition, accuracy, and quality. DOGAMI also provided a separate report summarizing their

methodologies and the results of quality control checks.

Process Date/Time: 2012-01-01 00:00:00

Process Step 3

CC ID: 1134751
Description:

Point-cloud data - all returns - classified - Lidar data points were classified (ASPRS standard) through automated point processing

algorithms and manual inspection.

Process Date/Time: 2012-01-01 00:00:00

Process Step 4

CC ID: 1134752
Description:

Point-cloud data - ground returns - classified - Lidar data points that were classified as "ground" were extracted to create the

ground point data file.

Process Date/Time: 2012-01-01 00:00:00

Process Step 5

CC ID: 1134753
Description:

Lidar intensity images - The lidar intensity values of ground points were symbolized (0-255 grayscale) according to their relative

intensity values. The resultant image was exported to a raster format.

Process Date/Time: 2012-01-01 00:00:00

Process Step 6

CC ID: 1134754
Description:

The NOAA Office for Coastal Management (OCM) received the files in las format. The files contained lidar

elevation and intensity measurements. The data were in UTM Zone 6 (NAD83) coordinates and elevations were in meters, referenced to

the NAVD88 (Geoid09) vertical datum. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The data were filtered for elevation outliers.

2. The data that were classified as 11, 12, and 13 were reclassified to classes 14, 15, and 16, respectively.

The following data classifications are available for download: 1 (Unclassified), 2 (Ground), 3 (Low Vegetation), 4 (Medium Vegetation),

6 (Buildings), 7 (Low Point/Noise), 9 (Water Surface), 10 (Ignored Ground - Ground points within 1 m of breaklines),

14 (Withheld - Points that have intensity values of 0 or 255), 15 (Mobile - Temporary Places Structures (cars, boats, docks,

buoys)), 16 (Utilities - Man made non-habitable structures (fences, power lines))

3. The data were converted from GPS week time to Adjusted GPS time.

4. The data were converted from UTM Zone 6 (NAD83) coordinates to geographic coordinates.

5. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid09.

6. The data were zipped to laz format.

Process Date/Time: 2013-10-01 00:00:00

Catalog Details

Catalog Item ID: 49626
GUID: gov.noaa.nmfs.inport:49626
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