49626
2012 Alaska Division of Geological and Geophysical Surveys (DGGS) Lidar: Whittier, Alaska
ak2012_whittier_m2580_metadata
Data Set
Published / External
49401
Lidar - partner (no harvest)
Project
Completed
2013
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
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.
10270
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
Theme
ISO 19115 Topic Category
elevation
Theme
Aerial Geology
Theme
Geologic Hazards
Theme
Geology
Theme
Geomorphology
Theme
Hazards
Theme
Hillshade Image
Theme
Point Cloud Data
Theme
Slope Instability
Office for Coastal Management
Charleston
SC
Data Set
None Planned
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.
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.
Data Steward
2013
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2013
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2013
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2013
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Ground Condition
-148.883498
-148.407257
60.879156
60.75784
Range
2012-10-21
2012-10-25
Yes
Unclassified
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.
;
None
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.
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2580
Customized Download
Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/index.html
Bulk Download
Simple download of data files.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/2580/supplemental/2012_DGGS_Whittier_Alaska_Lidar.kmz
Browse Graphic
Browse Graphic
kmz
This graphic shows the lidar coverage for the Whittier, Alaska area.
2017-10-10
Date that the source FGDC record was last modified.
2017-11-14
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.
2018-02-08
Partial upload of Positional Accuracy fields only.
2018-03-13
Partial upload to move data access links to Distribution Info.
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 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
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
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
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
1
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.
2012-01-01T00:00:00
2
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.
2012-01-01T00:00:00
3
Point-cloud data - all returns - classified - Lidar data points were classified (ASPRS standard) through automated point processing
algorithms and manual inspection.
2012-01-01T00:00:00
4
Point-cloud data - ground returns - classified - Lidar data points that were classified as "ground" were extracted to create the
ground point data file.
2012-01-01T00:00:00
5
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.
2012-01-01T00:00:00
6
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.
2013-10-01T00:00:00
gov.noaa.nmfs.inport:49626
Anne Ball
2017-11-15T15:21:17
SysAdmin InPortAdmin
2022-08-09T17:11:37
2022-03-16
OCM Partners
OCMP
1002
Public
No
2022-03-16
1 Year
2023-03-16