2024 - 2025 USGS Lidar DEM: Northern SC

The Digital Elevation Model dataset consists of tiled LiDAR DEM Images. Each file contains a Raster Image of the Digital Elevation Model. The Geographical Extent of this dataset extends to the entirety of the SC_Northern_1_D24 UTM Zone 17N boundary, approximately 2760 square miles, covering the following counties: Cherokee, Chester, Fairfield (partial), Lancaster (partial), Union, York.

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.

The USGS and NRCS contracted Digital Aerial Solutions, LLC to obtain professional services related to the planning, acquisition and development of Light Detection and Ranging (Lidar) data and derivative products. The task order is for a QL1 LiDAR survey to be collected over northern South Carolina. The deliverable products would be used to support the State of South Carolina, and the 3DEP mission.

All Lidar data and associated products were acquired, calibrated, and used in the creation of Lidar derived products by Digital Aerial Solutions, LLC.

Raster File Type = GeoTIFF

Bit Depth/Pixel Type = 32-bit float

Raster Cell Size = 0.5 Meter

Interpolation or Resampling Technique = TIN

Required Vertical Accuracy = 19.6 cm NVA

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

To the extent possible under law, the U.S. Government has waived all copyright and related or neighboring rights to this dataset.

Data is available online for bulk and custom downloads.

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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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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.

Inertial Explorer ver: 8.9; GeoCue Ver: 2020.1.22.1; Microstation CONNECT 10.12.00.40 ;TerraScan v021.034; LP360 ver: 2021.1.47.0; ArcMap ver: 10.7; Global Mapper ver: 18.1

This data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2023) for a 36.0 (cm) RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy =+/- 50.2 cm at a 95% confidence level.

This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2024) for a 10-cm RMSEz Vertical Accuracy Class.

USGS Determined DEM Vertical Accuracy:

Non-Vegetated Vertical Accuracy (NVA) = 4.99 cm RMSE

Vegetated Vertical Accuracy (VVA) = 18 cm at the 95th Percentile

Please refer to the USGS Project Report in the URL section of this metadata record.

The RAW LAS data files included all data points collected. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The RAW point cloud is of good quality and data passes Fundamental Vertical Accuracy specifications. Void areas (i.e., areas outside the project boundary but within the tiling scheme) are coded using a unique NODATA value. This value is identified in the appropriate location within the file header.

Aerial LiDAR data covers the entire 2760 square miless Area of Interest intended for this project.All LiDAR Point Cloud tiles show no edge artifacts or mismatches from tile to tile. Void areas (i.e., areas outside the project boundary but within the tiling scheme) are coded using a unique NODATA value. This value is identified in the appropriate location within the file header. 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.