2021 USGS/NRCS Lidar DEM: Delta Junction, AK
Data Set (DS) | OCM Partners (OCMP)GUID: gov.noaa.nmfs.inport:80320 | Updated: August 12, 2026 | Published / External
-
View As
- Full List View
- EXPORTS
- InPort XML
- ISO 19115
- WAF Files
- View in Hierarchy
Summary
Short Citation
OCM Partners, 2026: 2021 USGS/NRCS Lidar DEM: Delta Junction, AK, https://www.fisheries.noaa.gov/inport/item/80320.
Full Citation Examples
A one-meter (1m) cell size Digital Elevation Model (DEM) raster was created from the ground classified lidar points plus the breaklines. The rasters are delivered in 32-bit floating point GeoTIFF format (.tif) and adhere to USGS-NGP Lidar Base Specification 2020 rev. A.
This metadata record supports the data entry in the NOAA Digital Coast Data Access Viewer (DAV). For this data set, the DAV is leveraging the GeoTIFF files hosted by USGS on Amazon Web Services.
This task is for providing a high-resolution QL2 lidar survey in late summer 2021 over an area of approximately 1,261 square miles in southeast Alaska in and around Delta Junction, which includes portions of Fairbanks North Star and Southeast Fairbanks Boroughs. This project will support the Natural Resource Conservation Service (NRCS), and the 3DEP mission. The project has 1622 tiles (1500x1500m).
Data Access & Downloads
-
Create custom data files by choosing data area, map projection, file format, etc. A new metadata will be produced to reflect your request using this record as a base.
-
GeoTIFF
Bulk download of data files in GeoTIFF format, based on a horizontal datum/projection of UTM Zone 6, NAD83(2011), meters (EPSG: 6335) and a vertical datum of NAVD88 (GEOID12B) and units in meters (EPSG: 5703).
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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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.
Controlled Theme Keywords
DIGITAL ELEVATION/TERRAIN MODEL (DEM), elevation, TERRAIN ELEVATION
URLs
-
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.
-
Link to the additional information available for this data set from the USGS. This information includes reports, tile index shapefiles, and hydro breaklines.
-
Link to the lidar report.
-
Link to the USGS work package report that provides project information, vertical accuracy results, classifications used, sensors used, and work unit information.
-
Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud.
-
Link to view the point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer.
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
https://coast.noaa.gov
Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov
Extents
-146.96522243452° W,
-144.3414406322° E,
64.37292617625° N,
63.63749711378° S
2021-09-07 - 2021-09-12
Item Identification
| Title: | 2021 USGS/NRCS Lidar DEM: Delta Junction, AK |
|---|---|
| Short Name: | ak2021_del_junc_dem_m14846 |
| Status: | Completed |
| Creation Date: | 2021 |
| Publication Date: | 2026 |
| Abstract: |
A one-meter (1m) cell size Digital Elevation Model (DEM) raster was created from the ground classified lidar points plus the breaklines. The rasters are delivered in 32-bit floating point GeoTIFF format (.tif) and adhere to USGS-NGP Lidar Base Specification 2020 rev. A. This metadata record supports the data entry in the NOAA Digital Coast Data Access Viewer (DAV). For this data set, the DAV is leveraging the GeoTIFF files hosted by USGS on Amazon Web Services. |
| Purpose: |
This task is for providing a high-resolution QL2 lidar survey in late summer 2021 over an area of approximately 1,261 square miles in southeast Alaska in and around Delta Junction, which includes portions of Fairbanks North Star and Southeast Fairbanks Boroughs. This project will support the Natural Resource Conservation Service (NRCS), and the 3DEP mission. The project has 1622 tiles (1500x1500m). |
| Supplemental Information: |
Raster File Type = TIFF Bit Depth/Pixel Type = 32-bit float Raster Cell Size = 1 meter Interpolation or Resampling Technique = Triangulated Irregular Network (TIN) Required Vertical Accuracy = 19.6cm NVA |
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 > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > DIGITAL ELEVATION/TERRAIN MODEL (DEM)
|
| ISO 19115 Topic Category |
elevation
|
Spatial Keywords
| Thesaurus | Keyword |
|---|---|
| Global Change Master Directory (GCMD) Location Keywords |
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
|
| 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
|
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: | Unknown |
| 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: | USGS, Merrick-Surdex Joint Venture, LLP |
Support Roles
Data Steward
| Date Effective From: | 2026 |
|---|---|
| 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: | 2026 |
|---|---|
| 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: | 2022 |
|---|---|
| Date Effective To: | |
| Contact (Organization): | U.S. Geological Survey |
| Address: |
12201 Sunrise Valley Drive Reston, VA 20191 USA |
| URL: | USGS Home |
Metadata Contact
| Date Effective From: | 2026 |
|---|---|
| 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: | 2026 |
|---|---|
| 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: | -146.96522243452 | |
|---|---|---|
| E° Bound: | -144.3414406322 | |
| N° Bound: | 64.37292617625 | |
| S° Bound: | 63.63749711378 |
Extent Group 1 / Time Frame 1
| Time Frame Type: | Range |
|---|---|
| Start: | 2021-09-07 |
| End: | 2021-09-12 |
Spatial Information
Spatial Resolution
| Horizontal Distance: | 1.0 Meter |
|---|
Spatial Representation
Representations Used
| Grid: | Yes |
|---|---|
| Vector: | No |
| Text / Table: | No |
| TIN: | No |
| Stereo Model: | No |
| Video: | No |
Reference Systems
Reference System 1
Coordinate Reference System |
|||||||||||||||||||||||
|
|||||||||||||||||||||||
Reference System 2
Coordinate Reference System |
|||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||
Access Information
| Security Class: | Unclassified |
|---|---|
| Data Access Procedure: |
Data is available online for bulk and custom 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
| Download URL: | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=14846/details/14846 |
|---|---|
| Distributor: | NOAA Office for Coastal Management (NOAA/OCM) (2026 - Present) |
| File Name: | Customized Download |
| Description: |
Create custom data files by choosing data area, map projection, file format, 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
| Download URL: | https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/OPR/Projects/AK_DeltaJunction_2021_D21/AK_DeltaJunction_1_2021/TIFF/ |
|---|---|
| Distributor: | U.S. Geological Survey (2022 - Present) |
| File Name: | Bulk Download |
| Description: |
Bulk download of data files in GeoTIFF format, based on a horizontal datum/projection of UTM Zone 6, NAD83(2011), meters (EPSG: 6335) and a vertical datum of NAVD88 (GEOID12B) and units in meters (EPSG: 5703). |
| File Type (Deprecated): | LAZ |
| Distribution Format: | GeoTIFF |
URLs
URL 1
| 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
| URL: | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AK_DeltaJunction_2021_D21/AK_DeltaJunction_1_2021/ |
|---|---|
| Name: | USGS Additional Info |
| URL Type: |
Online Resource
|
| Description: |
Link to the additional information available for this data set from the USGS. This information includes reports, tile index shapefiles, and hydro breaklines. |
URL 3
| URL: | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AK_DeltaJunction_2021_D21/AK_DeltaJunction_1_2021/reports/Lidar_Report/140G00221F0235-AK_DeltaJunction_2021_D21_WU_ID_222955_Lidar_Mapping_Report.pdf |
|---|---|
| Name: | Lidar Report |
| URL Type: |
Online Resource
|
| File Resource Format: | |
| Description: |
Link to the lidar report. |
URL 4
| URL: | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AK_DeltaJunction_2021_D21/USGS_AK_DeltaJunction_2021_D21_WP_Report.pdf |
|---|---|
| Name: | USGS Work Package Report |
| URL Type: |
Online Resource
|
| File Resource Format: | |
| Description: |
Link to the USGS work package report that provides project information, vertical accuracy results, classifications used, sensors used, and work unit information. |
URL 5
| URL: | https://s3-us-west-2.amazonaws.com/usgs-lidar-public/AK_DeltaJunction_1_2021/ept.json |
|---|---|
| Name: | USGS Entwine Point Tiles (EPT) |
| URL Type: |
Online Resource
|
| File Resource Format: | json |
| Description: |
Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud. |
URL 6
| URL: | https://usgs.entwine.io/data/view.html?r=%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/AK_DeltaJunction_1_2021%22 |
|---|---|
| Name: | USGS Potree 3D View |
| URL Type: |
Online Resource
|
| Description: |
Link to view the point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer. |
Data Quality
| Vertical Positional Accuracy: |
This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class. USGS Determined DEM Vertical Accuracy Non-Vegetated Vertical Accuracy (NVA) = 4.6 cm RMSE Vegetated Vertical Accuracy (VVA) = 23.54 cm at the 95th Percentile Refer to the USGS Project Report for further details. The link to this report is provided in the URL section of this metadata record. |
|---|---|
| Completeness Report: |
The dataset was reviewed to ensure completeness and accuracy. |
| Conceptual Consistency: |
Data covers the entire area specified for this project. |
Data Management
| Have Resources for Management of these Data Been Identified?: | Yes |
|---|---|
| Approximate Percentage of Budget for these Data Devoted to Data Management: | Unknown |
| Do these Data Comply with the Data Access Directive?: | Yes |
| Actual or Planned Long-Term Data Archive Location: | NCEI-CO |
| How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?: |
Data is backed up to tape and to cloud storage. |
Lineage
| Lineage Statement: |
The NOAA Office for Coastal Management (OCM) ingested references to the USGS GeoTIFF files that are hosted on Amazon Web Services (AWS), into the Digital Coast Data Access Viewer (DAV). The DAV accesses the raster data as it resides on AWS. |
|---|
Sources
USGS AWS GeoTIFF Files - AK_DeltaJunction_1
| Contact Role Type: | Publisher |
|---|---|
| Contact Type: | Organization |
| Contact Name: | USGS |
| Citation URL: | https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/OPR/Projects/AK_DeltaJunction_2021_D21/AK_DeltaJunction_1_2021/TIFF/ |
| Citation URL Name: | USGS AWS GeoTIFF Files for AK_DeltaJunction_1 |
Process Steps
Process Step 1
| Description: |
Lidar data was collected using Optech Galaxy Prime sensor. The raw data was verified in MARS software for complete coverage of the project area, and boresighted to align the flightlines. Raw data files were parsed into manageable client-specific tiles. These tiles were then processed through automated filtering that separates the data into different classification groups: unclassified points, ground points, low noise, water, bridge decks, high noise and ignore ground. The data was next taken into MARS to reclassify the erroneous points that may remain in the lidar point cloud after auto filter. Two points per square meter (QL2). |
|---|---|
| Process Date/Time: | 2022-01-06 00:00:00 |
Process Step 2
| Description: |
LiDAR swath data was measured to have an average of 0.589 meter nominal pulse spacing and 2.88 pulses per meter. The method used was counting first return points within each swath, then dividing by the area of the extent of the corresponding swath to get density. NPS was mathematically derived from this density number. This was performed on each swath then averaged to generate the two numbers above. This USGS method does not consider swath sidelap in these calculations. |
|---|---|
| Process Date/Time: | 2022-01-06 00:00:00 |
Process Step 3
| Description: |
Using MARS software a one-meter (1m) 32-bit floating point DEM raster in GeoTIFF format (.tif) were created using the ground classified lidar points with the hydro-flattened breaklines. The files are delivered in 1500m by 1500m tiles. |
|---|
Process Step 4
| Description: |
The NOAA Office for Coastal Management (OCM) created references to the USGS GeoTIFF files that were ingested into the NOAA Digital Coast Data Access Viewer (DAV). No changes were made to the data. The DAV will access the raster data as it resides on Amazon Web Services (AWS). These are the GeoTIFF files that are being accessed: https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/OPR/Projects/AK_DeltaJunction_2021_D21/AK_DeltaJunction_1_2021/TIFF/ |
|---|---|
| Process Date/Time: | 2026-08-12 00:00:00 |
| Process Contact: | Office for Coastal Management (OCM) |
| ROR: | https://ror.org/05v14bq57 |
Related Items
| Item Type | Relationship Type | Title |
|---|---|---|
| Data Set (DS) | Cross Reference |
2021 USGS/NRCS Lidar: Delta Junction, AK |
Catalog Details
| Catalog Item ID: | 80320 |
|---|---|
| GUID: | gov.noaa.nmfs.inport:80320 |
| Metadata Record Created By: | Rebecca Mataosky |
| Metadata Record Created: | 2026-08-12 17:56+0000 |
| Metadata Record Last Modified By: | Rebecca Mataosky |
| Metadata Record Last Modified: | 2026-08-12 18:22+0000 |
| Metadata Record Published: | 2026-08-12 |
| Owner Org: | OCMP |
| Metadata Publication Status: | Published Externally |
| Do Not Publish?: | N |
| Metadata Last Review Date: | 2022-07-07 |
| Metadata Review Frequency: | 1 Year |
| Metadata Next Review Date: | 2023-07-07 |