Data Management Plan (Deprecated)

This airborne LiDAR terrain mapping data was acquired January through March 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 Neuse, Pasquotank, Tar-Pamlico,

and White Oak River Basins in central and eastern North Carolina. This area consists of 33 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.

Original contact information:

Contact Org: NC Floodplain Mapping Program

Phone: 919-715-0408

Email: hmorgan@ncem.org

Process Steps:

• 2001-02-01 00:00:00 - All data collection flights were initialized and finalized during periods of GPS Position Dilution of Precision greater than 4. GPS data quality was evaluated post-flight to ensure sufficient quality for LIDAR data requirements and integration. GPS base maximum allowable distance between stations was established such that no more than a 50 mile radius occurred between occupations. Swath width of terrain covered in a single flightline for inland areas at an altitude of 12,000 feet AMT was approximately 3,411 meters, coastal areas at an altitude of 8,000 feet AMT was approximately 2,274 meters. Field of View for the Leica GeoSystems Aeroscan system used was 50 degrees project wide, or 25 degrees from nadir with a maximum of 5 returns collected for each pulse. Ground distance between flightlines for inland areas at 12,000 feet AMT was approximately 2,388 meters, for coastal areas at 8,000 feet AMT was approximately 1,592 meters. Nominal post spacing for finalized Bare Earth product was 3 meters. An average of 10-20 rapid static GPS survey collected ground control points were established per base airport project wide to detect and correct horizontal and vertical bias. Typically, 3 or more flightlines of LIDAR returns were collected for each airport lift, one of which being bi-directional for use in optimizing instrument boresight angles to account for aircraft pitch, yaw and roll. All post process collection quality assurance is achieved aided by airport cross and bi-directional flightlines, entire lift cross flightlines, and the use of surveyed ground control points.
• 2001-02-01 00:00:00 - Checking for coverage and anomalies, Airport calibration, Production flightline calibration, and Removal of blunders
• Tiling Automated filtering for point classification, Manual editing to classify points, Quality control, Removal of all points not classified as bare earth
• The methods used to develop these data for the North Carolina Floodplain Mapping Program are documented in LIDAR Bare Earth Mass Points and Breaklines Technical Document, available online at www.ncfloodmaps.com.
• 2012-12-01 00:00:00 - The lidar point data were received by the NOAA Office for Coastal Management from the USGS Center for Lidar Coordination and Knowledge (CLICK) in las format. The files contained lidar elevation and intensity measurements. The data were unclassified, in State Plane coordinates, and were vertically referenced to NAVD88. 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 sorted by time and laszipped.

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

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1397

;