80299 PostHelene-NC_2025 DEM m14054 Data Set Published / External 49404 DEMs - partner (no harvest) Project Completed 2025 Product: These data were acquired by the NC Collaboratory at UNC Chapel Hill utilizing funds appropriated by the NC General Assembly. These are Digital Elevation Model (DEM) data for North Carolina as part of the required deliverables for the NC_Lidar_Phase3_Draft_Metadata project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 3.125 ft, 10-ft, and 20 ft hydro-flattened Raster DEM. The Class 2 points were derived from the proeject data collected and processed at a USGS QL1 level of quality. Geographic Extent: 12 counties in North Carolina, covering approximately 5,060 total square miles. Counties covered in their entirety for this project included: Ashe, Watauga, Avery, Mitchell, Burke, Yancey, McDowell, Rutherford, Buncombe, Henderson, Haywood, and Jackson. Dataset Description: The Helene-North Carolina Priority 1 Lidar and Imagery project called for the planning, acquisition, and processing of lidar data to be collected at an approximate 8 points per square meter to meet USGS QL1 specifications. Project specifications are based on the USGS Lidar Base Specifications along with specific North Carolina Emergency Management standards for the North Carolina Floodplain Mapping Program for lidar classification types and specialized, derivative products. In addition to project oversight AECOM's performed an independent quality assurance effort against project specifications. This effort was limited to a 10% review of the lidar tiles and coincident vector Geodatabases in each county. Additionbally a randomized 5% review of the ESRI terrains, DEM, and intensity rasters was also performed. 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 3.125 ft, 5-ft, and 10 ft 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 = 3.125 ft, 5-ft, and 10 ft; 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 > 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 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 Theme DEM Theme Elevation Data Theme Lidar Theme Model Theme Raster Theme Remote Sensing Spatial Ashe County Spatial Avery County Spatial Buncombe County Spatial Burke County Spatial Haywood County Spatial Henderson County Spatial Jackson County Spatial McDowell County Spatial Mitchell County Spatial North Carolina Spatial Rutherford County Spatial Watauga County Spatial Yancey County 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 AECOM Technical Services, Inc.; State of North Carolina 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 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 -83.266278837 -80.582747359 36.332719738 34.58587958 Range 2025-01-09 2025-03-28 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 or 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=14054/details/14054 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://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/dem/NC_postHelene_2025_14054/index.html 2026 Organization NOAA Office for Coastal Management Bulk Download Bulk download of data files in the original coordinate system. https://coast.noaa.gov/ NOAA's Office for Coastal Management (OCM) website Online Resource HTML Information on the NOAA Office for Coastal Management (OCM) 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. This data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data, Edition 2 (2023) for a 22(cm) RMSEh horizontal positional accuracy Class. The specifications require that only nonvegetated vertical accuracy (NVA) be computed for raw LiDAR data swath files. The vertical accuracy was tested with 81 independent survey points located in open terrain. These check points were not used in the calibration or post processing of the LiDAR data. The survey check points were distributed throughout the project area.Qualitative value:0.0219 , Test that produced the value: This data set was tested to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data, Edition 2 (2023) for a 10 (cm) RMSEv Vertical Accuracy Class. NVA accuracy was found to be RMSEv = 2.19 (cm). 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. Post-Helene Digital Elevation Model in Western North Carolina Organization North Carolina Spatial Data Download Originator 2026-03-25 https://sdd.nc.gov/ North Carolina Spatial Data Download Download system for North Carolina Lidar Data was requested through the NC SDD system and transferred directly to cloud storage. 1 Hydro-Flattened Raster DEM Processing: Class 2 (Ground) LiDAR points in conjunction with the hydro-breaklines were used to create a 3.125 ft, 10-ft, and 20 ft 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. 2025-01-01T00:00:00 2 Data were received by NOAA Office of Coastal Management from the North Carolina Spatial Data Download system. Data were ingested into the NOAA Digital Coast Data Access Viewer without change. 2026-08-01T00:00:00 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 Post-Helene Digital Elevation Model in Western North Carolina gov.noaa.nmfs.inport:80299 Kirk Waters 2026-08-03T12:15:39 Rebecca Mataosky 2026-09-04T14:58:03 2026-08-03 OCM Partners OCMP 1002 Public No No 2026-08-03 1 Year 2027-08-03