79546 ak2023_lake_penin_dem_m14067 Data Set Published / External 49404 DEMs - partner (no harvest) Project Completed 2023 2026 Product: These are Digital Elevation Model (DEM) data for Alaska as part of the required deliverables for the AK_LakePeninsula_2_B23 project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 0.5 meter hydro-flattened Raster DEM. Geographic Extent: This dataset consists of 3 blocks, they are: AK_LakePeninsula_1 (Work Unit 300502) - covering approximately 264 total square miles in Lake and Peninsula Borough AK_LakePeninsula_2 (Work Unit 300503) - covering approximately 128 total square miles in Lake and Peninsula Borough AK_LakePeninsula_3 (Work Unit 300504) - covering approximately 97 total square miles in Lake and Peninsula Borough Dataset Description: The AK_LakePeninsula_2_B23, project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.35 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, 2023 Rev. A. The data were developed based on a horizontal projection/datum of NAD 1983 2011 UTM Zone 4N and 5N, Meters and vertical datum of NAVD88 Geoid 12b, Meters. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to individual 1500 m x 1500 m tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 1500 m x 1500 m schema. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in summer 2023 and 2024, while no snow was on the ground and rivers were at or below normal levels. 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. To acquire detailed surface elevation data for use in conservation planning, design, research, floodplain mapping, dam safety assessments and elevation modeling, etc. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create intensity images, breaklines and raster DEMs. The purpose of these LiDAR data was to produce high accuracy 3D hydro-flattened digital elevation models (DEMs) with a 0.5 meter cell size. These raw LiDAR point cloud data were used to create classified LiDAR LAS files, intensity images, 3D breaklines, and hydro-flattened DEMs as necessary. Raster File Type = GeoTIFF; Bit Depth/Pixel Type = 32-bit float; Raster Cell Size = 0.5 meter; Interpolation or Resampling Technique = Triangulated Irregular Network (TIN), Linear Interpolation, Proprietary; Required Vertical Accuracy = 0.196 Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > DIGITAL ELEVATION/TERRAIN MODEL (DEM) Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION Theme ISO 19115 Topic Category elevation Spatial Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA Spatial Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA Spatial Global Change Master Directory (GCMD) Location Keywords VERTICAL LOCATION > LAND SURFACE Instrument Global Change Master Directory (GCMD) Instrument Keywords LIDAR > Light Detection and Ranging Platform Global Change Master Directory (GCMD) Platform Keywords Airplane > Airplane Office for Coastal Management Charleston SC Data Set Elevation None Planned Model (digital) Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners. USGS, NV5 Geospatial Data Steward 2026 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 2026 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 2026 Organization U.S. Geological Survey 12201 Sunrise Valley Drive Reston VA 20191 USA https://usgs.gov USGS Home Home page for USGS Online Resource Metadata Contact 2026 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 2026 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 AK_LakePeninsula_2 (Work Unit 300503) - covering approximately 128 total square miles in Lake and Peninsula Borough -158.98501473 -157.304814667 58.3301562615 56.2045065193 Area of collection for AK_LakePeninsula_2 (Work Unit 300503) Range 2023-06-02 2023-07-22 Dates of collection for AK_LakePeninsula_2 (Work Unit 300503) AK_LakePeninsula_3 (Work Unit 300504) - covering approximately 97 total square miles in Lake and Peninsula Borough -159.51 -158.3 57 55.87 Area of collection for AK_LakePeninsula_3 (Work Unit 300504) Range 2023-06-02 2024-08-14 Dates of collection for AK_LakePeninsula_3 (Work Unit 300504) AK_LakePeninsula_1 (Work Unit 300502) - covering approximately 264 total square miles in Lake and Peninsula Borough -156.31 -153.59 60.24 59.21 Area of collection for AK_LakePeninsula_1 (Work Unit 300502) Range 2023-07-12 2023-07-24 Dates of collection for AK_LakePeninsula_1 (Work Unit 300502) Yes No No No No Projected EPSG:6333 NAD83(2011) / UTM zone 4N NAD83 (National Spatial Reference System 2011) GRS 1980 6378137 298.257222101 NAD83(2011) UTM zone 4N Transverse Mercator 1 Easting E metre east Projected EPSG:6334 NAD83(2011) / UTM zone 5N NAD83 (National Spatial Reference System 2011) GRS 1980 NAD83(2011) 1 Easting E M East Vertical EPSG:5703 NAVD88 height North American Vertical Datum 1988 1 Gravity-related height H metre up Custom Universal (CC0 1.0) Public Domain Dedication https://creativecommons.org/publicdomain/zero/1.0/ To the extent possible under law, the U.S. Government has waived all copyright and related or neighboring rights to this dataset. Unclassified Data is available online for bulk and custom downloads. 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. https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=14067/details/14067 2026 Organization NOAA Office for Coastal Management Customized Download 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. Not Applicable Zip https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/OPR/Projects/AK_LakePeninsula_B23/ 2026 Organization U.S. Geological Survey Bulk Download Bulk download of data files in the original coordinate system. GeoTIFF https://coast.noaa.gov/dataviewer/ NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV) Online Resource HTML 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. https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/metadata/AK_LakePeninsula_B23/AK_LakePeninsula_1_B23/reports/AK_LakePeninsula_1_B23_WU300502.pdf Lidar Report - AK_LakePeninsula_1 Online Resource pdf Link to the NV5 lidar report for AK_LakePeninsula_1 https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/metadata/AK_LakePeninsula_B23/AK_LakePeninsula_2_B23/reports/AK_LakePeninsula_2_B23_WU300503.pdf Lidar Report - AK_LakePeninsula_2 Online Resource pdf Link to the NV5 lidar report for AK_LakePeninsula_2 https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/metadata/AK_LakePeninsula_B23/AK_LakePeninsula_3_B23/reports/AK_LakePeninsula_B23_WU300504_Lidar_Report.pdf Lidar Report - AK_LakePeninsula_3 Online Resource pdf Link to the NV5 lidar report for AK_LakePeninsula_3 https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/metadata/AK_LakePeninsula_B23/USGS_AK_LakePeninsula_B23_Project_Report.pdf USGS Project Report Online Resource pdf Link to the USGS Project Report that provides information about the project, vertical accuracy results, and the point classes and sensors used. https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/metadata/AK_LakePeninsula_B23/ USGS Additional Info Online Resource Link to the reports, breaklines, metadata, and spatial metadata. Lidar horizontal accuracy is a function of Global Navigation Satellite System (GNSS) derived positional error, flying altitude, and INS derived attitude error. The obtained RMSEr value is multiplied by a conversion factor of 1.7308 to yield the horizontal component of the National Standards for Spatial Data Accuracy (NSSDA) reporting standard where a theoretical point will fall within the obtained radius 95% of the time. Based on a flying altitude of 2478 meters, an IMU error of 0.002 decimal degrees, and a GNSS positional error of 0.015 meters, this project was compiled to meet 0.27 meter horizontal accuracy at the 95% confidence level. 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) = 3.23 cm RMSE Vegetated Vertical Accuracy (VVA) = 26.14 cm at the 95th Percentile Datasets contain complete coverage of tiles. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. There are no void areas or missing data. The raw point cloud is of good quality and data pass Non-Vegetated Vertical Accuracy specifications. Data cover the entire area specified for this project. 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. USGS AWS GeoTIFF Files - AK_LakePeninsula_1 Organization USGS Publisher https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/OPR/Projects/AK_LakePeninsula_B23/AK_LakePeninsula_1_B23/TIFF/ USGS AWS GeoTIFF Files for AK_LakePeninsula_1 USGS AWS GeoTIFF Files - AK_LakePeninsula_2 Organization USGS Publisher https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/OPR/Projects/AK_LakePeninsula_B23/AK_LakePeninsula_2_B23/TIFF/ USGS AWS GeoTIFF Files - AK_LakePeninsula_2 USGS AWS GeoTIFF Files - AK_LakePeninsula_3 Organization USGS Publisher https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/OPR/Projects/AK_LakePeninsula_B23/AK_LakePeninsula_3_B23/TIFF/ USGS AWS GeoTIFF Files for AK_LakePeninsula_3 1 Hydro-Flattened Raster DEM Processing: Class 2 (Ground) LiDAR points in conjunction with the hydro-breaklines were used to create a 0.5 meter hydro-flattened raster DEM. Using automated scripting routines in proprietary software, GeoTIFF files were created for each tile. Each surface was reviewed using Global Mapper to check for any surface anomalies or incorrect elevations found within the surface. 2024-01-01T00:00:00 2 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_LakePeninsula_B23/AK_LakePeninsula_1_B23/TIFF/ https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/OPR/Projects/AK_LakePeninsula_B23/AK_LakePeninsula_2_B23/TIFF/ https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/OPR/Projects/AK_LakePeninsula_B23/AK_LakePeninsula_3_B23/TIFF/ 2026-04-07T00:00:00 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 79908 Data Set Cross Reference gov.noaa.nmfs.inport:79546 Rebecca Mataosky 2026-04-07T13:35:27 Rebecca Mataosky 2026-04-07T14:26:45 2026-04-07 OCM Partners OCMP 1002 Public No No 2026-04-07 1 Year 2027-04-07