2015 NOAA Lidar: Pelekane Watershed (HI)

This metadata describes the Digital Elevation Model (DEM) 1 meter products derived from the airborne LiDAR data collected in August of 2015 for the Pelekane Watershed on the big island of Hawaii. The point cloud dataset was acquired with an Optech Orion M300 Airborne LiDAR Terrain Mapper with a nominal point spacing of 0.33 m. The DEM for this delivery was made from airborne LiDAR in LP360. A triangulated irregular network (TIN) was generated based on the LiDAR ground information (Using the tenderloin part of the point cloud only), and was later converted in a 1-meter raster file (DEM). Horizontal positions are referenced to UTM Zone 5 North (NAD83 PA11). Vertical elevations are in an orthometric datum derived from applying Geoid12b to NAD83(2011) ellipsoid heights and are in meters.

The LiDAR data will support local hydrologists and watershed managers in their decision-making processes for the Pelekane Watershed.

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The final report for this project may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/5180/supplemental/hi2015_noaa_pelekane_m5180_lidar_report.pdf

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

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5192

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None

None, however, 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be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions.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 these data for critical applications without a full awareness of its limitations.

LP360 2014.1.51.1; MicroStation v8i 08.11.09.357; TerraScan v8i 015.022; Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.1.1.3143

These data are not attributed. | Quantitative Value: N/A | Quantitative Test Explanation: These data are not attributed.

For the lidar points that these DEMs were created from, Towill, Inc. and NOAA provided GPS surveys of ground control points distributed over the whole project area for LiDAR accuracy validation. A control report has been computed with Terrascan as a quality assurance check. ; Quantitative Value: 0.173 meters, Test that produced the value: Ground check points were surveyed on the hardest and flatest surfaces available. Due to the remote location of the area of interest, hard, flat surfaces like roads were not always available. The relationship between surveyed and LiDAR points was analyzed in order to determine the elevation difference and root square mean error (RMSEz) for the dataset. An automated tool in Terrascan was used to perform the analysis. Vertical accuracy value reported as ASPRA-NSDDA accuracy(z)(95%) in m.

The data quality reports are complete and provided as a report to this dataset

Automatic qualitative assessments were performed to gauge data completeness. Automatic qualitative assessments were performed to gauge absolute vertical accuracy. Automatic and visual qualitative assessments were performed to gauge relative vertical accuracy. The software packages utilized to perform the assessments were Terrascan, LP360 and Lastools.