Data Management Plan (Deprecated)

This airborne LiDAR terrain mapping data was acquired in the spring of 2001. The data were collected for the floodplain mapping program for the state of North Carolina. The data were collected for the state in three phases: 1, 2, and 3. This metadata record describes that data that were in phase 1 of collection and fall within the Cape Fear and Lumber River Basins in central and eastern North Carolina. This area consists of 30 counties which are listed below in the Place Keywords field.

The data were received by the NOAA Office for Coastal Management from the U.S. Geological Survey (USGS) Center for Lidar Coordination and Knowledge (CLICK). For data storage and Digital Coast provisioning purposes, the OCM converted the data to geographic coordinates and ellipsoid (Geoid99) elevations. The data are unclassified.

Process Steps:

• 2002-05-31 00:00:00 - Production Narrative: Data collected were processed to determine that valid GPS values were achieved on all flights. The flight data was processed using proprietary automated algorithms that calculate the x, y, and z value of each point by combining GPS position of the aircraft, IMU attitude of the aircraft, range of the laser pulse, and scan angle of the laser scanner. Resulting data from each flight line was then compared to crossing and bordering flight lines to identify any residual pitch, roll or yaw errors. Data were also compared to calibration flights over airports in or adjacent to the Cape Fear and Lumber River Basins. Data were then edited in TerraModel by comparing contour lines, shaded relief models (hillshading) and points clouds within tiles and from one tile to the next. Finally, the data were compared to available ground survey data prior to submitting to the State for QAQC checks.
• 2008-01-01 00:00:00 - Lidar points were supplied to the USGS EROS Center. Points received in a file format other than LAS were converted to LAS, if the data contained adequate attribute information to create a valid LAS file and without the loss of any original attribute information. The points have been re-tiled into a standard Quarter-Quad, or Quarter-Quarter-Quad, scheme for publication on the CLICK website. The data remain in the Coordinate Reference System in which they were received. No alteration of any sort, of either the geometry or attribute values or structure has been performed.
• 2023-10-03 00:00:00 - The lidar point data were originally received by the NOAA Office for Coastal Management from the USGS Center for Lidar Coordination and Knowledge (CLICK) in las format in 2012. In 2023, some of the tiles were found to be missing data. The data were reacquired from the USGS legacy data web site, no longer in a quarter quad related tile scheme. The data were reprocessed for the Digital Coast. OCM performed the following processing for data storage and Digital Coast provisioning purposes: 1. The data were converted from State Plane coordinates to geographic coordinates. 2. The data were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid99. 3. The data were compressed in the cloud optimized point cloud version of LAZ. (Citation: Point cloud files)

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1399

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