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Short Citation:
OCM Partners, 2023: 2014 AK DOT Lidar DEM: Anita Bay, AK, https://www.fisheries.noaa.gov/inport/item/53414.

Item Identification

Title: 2014 AK DOT Lidar DEM: Anita Bay, AK
Short Name: ak2014_anita_dem_m8591_metadata
Status: Completed
Publication Date: 2015-02-27
Abstract:

Because no metadata record was provided with the Anita Bay data, this record was created by the NOAA Office for Coastal Management (OCM) based on information supplied in the Anita Bay Corridor Quality Assurance Report, the Tetra Tech UAF Light Detection and Ranging (LiDAR) and Ortho-Imagery Data Project Revilla Corridor, and the Hoonah metadata. Links to both reports are provided in the URL section of this record.

Tetra Tech was contracted by the University of Alaska Fairbanks (UAF) to provide LiDAR and ortho-imagery data for the Road to Resources in Alaska Program. Tetra Tech collected LIDAR data and aerial imagery during the fall of 2013 and the spring/summer of 2014.

This data is part of a data set of LiDAR point cloud data, derived elevation products and orthoimagery. The data were acquired along 5 corridors in South Eastern Alaska near Ketchikan and Juneau. The data were procured by GINA (Geographic Information Network of Alaska) at the University of Fairbanks (UAF) on behalf of the Alaska DoT (Department of Transportation). The 5 corridors are identified as Anita Bay, Bradfield to Behms, Hoonah, Revilla and Wrangell.

The NOAA Office for Coastal Management (OCM) downloaded this bare earth raster data from the AK DGGS site (https://elevation.alaska.gov/) and processed the data to be available on the Digital Coast Data Access Viewer (DAV).

In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from, are also available. These data are available for custom download at the link provided in the URL section of this metadata record.

Purpose:

The purpose of this LiDAR data is to support transportation planning within the Road to Resources Program in Alaska.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation
UNCONTROLLED
None beach
None DEM
None erosion
None Road to Resources

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
Airplane > Airplane
Global Change Master Directory (GCMD) Platform Keywords
DEM > Digital Elevation Model

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Elevation
Maintenance Frequency: None Planned
Data Presentation Form: Model (digital)
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners

Data Set Credit: Geographic Information Network of Alaska (GINA), University of Alaska Fairbanks, (UAF), Department of Transportation (DoT) Alaska, Tetra Tech Geomatic Technologies Group

Support Roles

Data Steward

CC ID: 769787
Date Effective From: 2018
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: 769788
Date Effective From: 2018
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: 769789
Date Effective From: 2018
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: 769790
Date Effective From: 2018
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: 1152244
W° Bound: -132.405159
E° Bound: -132.363743
N° Bound: 56.218713
S° Bound: 56.188569

Extent Group 1 / Time Frame 1

CC ID: 1152243
Time Frame Type: Discrete
Start: 2014-06-27

Spatial Information

Spatial Resolution

Horizontal Distance: 3.0 Foot

Reference Systems

Reference System 1

CC ID: 1257753

Coordinate Reference System

CRS Type: Vertical
EPSG Code: EPSG:6360
EPSG Name: NAVD88 height (ftUS)
See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for custom and bulk downloads.

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.

Distribution Information

Distribution 1

CC ID: 769791
Start Date: 2018
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8591
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2018 - Present)
File Name: Customized Download
Description:

Create custom data files by choosing data area, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base.

File Type (Deprecated): zip
Compression: Zip

Distribution 2

CC ID: 769792
Start Date: 2018
End Date: Present
Download URL: https://coast.noaa.gov/htdata/raster2/elevation/AK_Anita_DEM_2014_8591
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2018 - Present)
File Name: Bulk Download
Description:

Bulk download of data files in orthometric heights

File Type (Deprecated): GeoTIFF
Distribution Format: GeoTIFF

URLs

URL 1

CC ID: 769793
URL: https://coast.noaa.gov/dataviewer/
Name: NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV)
URL Type:
Online Resource
File Resource Format: HTML
Description:

The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer.

URL 2

CC ID: 769794
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8590/supplemental/ak2014_anita_m8590.kmz
Name: Browse graphic
URL Type:
Browse Graphic
File Resource Format: KML
Description:

This graphic displays the footprint for this lidar data set.

URL 3

CC ID: 769795
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8590/supplemental/Anita_Bay_Tetra_Tech_Report.pdf
Name: Dataset report
URL Type:
Online Resource
File Resource Format: PDF
Description:

Link to Tetra Tech report.

URL 4

CC ID: 769796
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8590/supplemental/Anita_Bay_Corridor_Quality_Assurance_Report.pdf
Name: Quality Assurance Report
URL Type:
Online Resource
Description:

Link to UAF Quality Assurace report.

URL 5

CC ID: 769797
URL: https://coast.noaa.gov/
Name: NOAA's Office for Coastal Management (OCM) website
URL Type:
Online Resource
File Resource Format: HTML
Description:

Information on the NOAA Office for Coastal Management (OCM)

URL 6

CC ID: 769798
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8590
URL Type:
Online Resource
Description:

Link to custom download the lidar point data from which these raster Digital Elevation Model (DEM) data were created.

Data Quality

Vertical Positional Accuracy:

Meets or exceed ASPRS class 2 accuracy for 2’ contours. The vertical accuracy analysis is based on TIN data derived from the classified LAS data. TIN data have been produced in AutoCAD Civil3D from the model key points. The Civil3D TIN has been independently certified by an Alaska PLS to meet or exceed ASPRS class 2 accuracy for 2 ft contours.

OCM found that there were 2 different values found for the vertical accuracy inthe two reports available for this data set. According to the Tetra Tech report (10 check points) referenced in the URL section of this metadata record, the value is 0.26 ft/7.9 cm RMSE. According to the UAF report (9 check points), also referenced in the URL section of this metadata record, the value is 0.18 ft/6 cm RMSE.

Completeness Report:

All LAS files and derived products have been visually inspected for completeness inside the project area of interest and passed inspection. Derived products contain gridded DEM, DSM and intensities, TIN data created in AutoCAD Civil3D and landxml export files.

Conceptual Consistency:

All data has been checked by automatic tools and visual inspection.

Lineage

Process Steps

Process Step 1

CC ID: 1152239
Description:

The LiDAR data for the Anita Bay corridor was acquired June 27 of 2014. SBET and shapefile of the trajectory are located with the point cloud data (see Figure 2 for the organization of LiDAR and LiDAR derived data). The data was post processed through PosPac, Waypoint’s GPS and IMU (inertial measurement unit) post processing software, and LMS, Optech’s LiDAR post processing software. PosPac is used to generate the trajectory file which contains the position (X, Y, Z) from differential GPS observations and the plane’s attitude (roll, pitch, heading) from the IMU. LMS is used to join the discreet point range information to the trajectory information through a common time stamp and to calibrate the data. The calibration is achieved by first identifying common features in the overlap of adjacent flight lines, and then adjustments are applied to the IMU’s angular offsets to align the data. Once finished, LMS refines the calibration further through a bundle adjustment to create the final calibrated data set.

Classification of the calibrated LiDAR data set is achieved through the use of TerraScan, the industry standard software from TerraSolid for classifying LiDAR. Individual macros were defined that derive and refine a ground surface, vegetation, and buildings. These macros are also used to eliminate spurious points below the surface and high point artifacts. The Anita Bay area was then manually checked and edited to eliminate low and high points as well as to ensure that points are classified appropriately.

Breaklines were derived from LiDAR and imagery and help define water classes in the LiDAR data.

Process Step 2

CC ID: 1152240
Description:

The DEM was created using ESRI 3DAnalyst. The individual steps included:

1.Importing all las files into the geodatabase as multipoint, all returns, classes 8 and 9.

2. Importing the breaklines as a feature layer.

3. Creating a terrain in 3D Analyst from all mass-points.

4. Creating a 3’ spacing grid, using the NATURAL_NEIGHBORS interpolation method

5. The ERDAS Imagine mosaic tool was then used to clip and tile the DEM at the same time into individual geotiff tiles

Process Step 3

CC ID: 1152241
Description:

The NOAA Office for Coastal Management (OCM) downloaded 16 tif files from the Alaska Division of Geological and Geophysical Surveys data Portal (https://elevation.alaska.gov/). The data were in Alaska State Plane, Zone 5001 coordinates (NAD83, US survey feet) and NAVD88 elevations (GEOID12A) in feet. The bare earth raster files are at a 3 ft grid spacing.

OCM converted the files to Cloud Optimized GeoTiffs and set the vertical georeferencing using GeoTiff 1.1 format.

Process Date/Time: 2023-06-26 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 53414
GUID: gov.noaa.nmfs.inport:53414
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2018-08-31 10:40+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-10-17 16:12+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