2020 OLC Lidar DEM: Harney - Silver Creek, OR

Original Product: This GIS dataset contains hydro-flattened Bare Earth (BE) raster grids depicting lidar-derived elevation data for the 2020 Harney-Silver Creek 3DEP project area.

Original Dataset Description: the 2020 Harney-Silver Creek 3DEP Lidar project area encompasses 596,275.2 acres; and is primarily in Harney County, Oregon, but extends into Crook County and Grant County. The delivered data are composed of legacy and new collection LiDAR data. Newly collected LiDAR data were acquired in July 2020 and this metadata record describes that data. Legacy datasets include 2015 OLC Harney, 2017 OLC Silver Creek, and 2018 OLC Harney lidar data and are not part of this metadata record.

This 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 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.3. The native projection is Lambert Conic Conformal, units are in International feet. The native horizontal datum is North American Datum of 1983 (NAD83(2011)); the native vertical datum is North American Vertical Datum of 1988 (NAVD88); (Geoid 12B). Hydro-flattened bare earth DEMs were derived from the classified LiDAR data and delivered within a 3000 ft x 3000 ft schema. Points that were determined to be geometrically invalid, or invalid surface returns, were removed from the data set.

Original Dataset Collection Ground Conditions: 2020 Lidar was collected between July 27 and July 28, 2020, while no snow was on the ground and rivers were at or below normal levels. Please see reports from the 2015 Harney, 2017 OLC Silver Creek, and 2018 Harney projects for acquisition details specific to those projects. The Raw Swath NVA were tested with checkpoints located in bare earth and urban (non-vegetated) areas. These checkpoints were not used in the calibration or post processing of the lidar point cloud data. For legacy data areas, the resulting NVA was 0.160 meters tested against the BE DEM; 0.158 meters tested against the TIN. The resulting VVA was 0.145 meters tested against the BE DEM. For newly collected data, the resulting NVA was 0.048 meters tested against the BE DEM; 0.075 meters tested against the TIN. The resulting VVA was 0.082 meters tested against the BE DEM. NVA and VVA values included within the data quality section were tested against the combined legacy and new collection areas. Quantum Spatial Inc. collected the lidar and created this dataset in partnership with the Oregon Department of Geology and Mineral Industries (DOGAMI).

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 USGS GeoTiff files hosted by USGS on Amazon Web Services.

This dataset provides high resolution elevation data that is used to produce three-dimensional models of the earth surface for the purpose of managing natural resources and mapping natural hazards.

CONTRACTOR: Quantum Spatial, Inc.

All ground survey data, Lidar data acquisition, calibration, and follow-on processing were completed by the prime contractor, Quantum Spatial, Inc.

Users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, surveying, or site specific purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners.

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.

LiDAR Mapping Suite 2.4, Applanix PosPac 7.1, Microstation Connect, TerraScan Version 19, TerraModeler Version 19, TerraMatch Version 19, ESRI ArcGIS 10.3.1, Windows 10 Operating System

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 DEM Determined Vertical Accuracy

Tested NVA RMSEz = 6.7 cm

Tested 95th percentile value for VVA is: 15.52 cm

For more information see the USGS project report and the lidar report. The links to these reports are provided in the URL section of this metadata record.

A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist.

Data covers the entire area specified for this project.

Data is backed up to cloud storage.

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.