2012 Alaska Division of Geological and Geophysical Surveys (DGGS) Lidar: Whittier, Alaska
Data Set (DS) | OCM Partners (OCMP)GUID: gov.noaa.nmfs.inport:49626 | Updated: August 9, 2022 | Published / External
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
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
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
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
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
W° Bound: | -148.883498 | |
---|---|---|
E° Bound: | -148.407257 | |
N° Bound: | 60.879156 | |
S° Bound: | 60.75784 |
Extent Group 1 / Time Frame 1
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
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
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
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
Activity Date/Time: | 2017-10-10 |
---|---|
Description: |
Date that the source FGDC record was last modified. |
Activity Log 2
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
Activity Date/Time: | 2018-02-08 |
---|---|
Description: |
Partial upload of Positional Accuracy fields only. |
Activity Log 4
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
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
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
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
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
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
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 |