Data Management Plan

Airborne LIDAR terrain mapping data acquired March through April 2005. These data sets may represent a single geographic tile of a larger, county/sub-county data set. As such, the map extent indicated in the Spatial_Domain element is representative of the larger data set and not an individual tile. The data sets are organized in 10,000 ft x 10,000 ft tiles using the NC Bureau of Land Records Management (LRMP) standards. Specific information about individual data tiles is included in the data delivery index. More information about this can be obtained at www.ncfloodmaps.com.

The native EBN full return flight lines were converted to LAS format (version 1.1) by the North Carolina Floodplain Mapping Program in May 2009. All other citation information remains unchanged.

Original contact information:

Contact Org: NC Floodplain Mapping Program

Phone: 919-715-0408

Email: hmorgan@ncem.org

Process Steps:

• 2003-12-22 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 at an altitude of 10,000 feet AMT was approximately 3,173 meters. Field of View for the Leica GeoSystems Aeroscan system used was 55 degrees project wide, or approximately 27.5 degrees from nadir with a maximum of 5 returns collected for each pulse. Nominal post spacing for finalized Bare Earth product was 2 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.
• 2003-12-22 00:00:00 - Checking for coverage and anomalies Airport calibration Production flightline calibration Removal of blunders
• 2003-12-22 00:00:00 - Tiling, Automated filtering for point classification, Manual editing to classify points, Quality control
• 2006-04-26 00:00:00 - 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.
• 2016-02-26 00:00:00 - The lidar point data were received by the NOAA Office for Coastal Management via ftp from NCFMP. The data were LAS format, horizontal datum NAD83 (1995) North Carolina State Plane (3200) feet, vertical datum NAVD88 US Survey Feet and contained elevation, intensity measurements and classifications. 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 in decimal degrees. 2. The data were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid03. 3. Outliers and Class 7 (noise) were removed.

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5011

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