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2001 North Carolina Floodplain Mapping Program (NCFMP) Lidar: Phase 1A (Neuse, Pasquotank, Tar-Pamlico, White Oak River Basins)

browse graphicThis kmz file shows the extent of coverage for the 2001 North Carolina Floodplain Mapping Program Phase 1A lidar data set.
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 Coastal Services Center from the U.S. Geological Survey (USGS) Center for Lidar Coordination and Knowledge (CLICK). For data storage and Digital Coast provisioning purposes, the CSC converted the data to geographic coordinates and ellipsoid (Geoid99) elevations. The data are unclassified.

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    Distribution Formats
    • LAZ
    Distributor DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    Point of Contact NC Floodplain Mapping Program
    919-715-0408
    hmorgan@ncem.org
    Documentation links not available.
    Originator
    • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    Originator
    • Floodplain Mapping Program, North Carolina Division of Emergency Management
    Publisher
    • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    Date(s)
    • publication: 2012-12-01
    Data Presentation Form: Digital image
    Dataset Progress Status Complete
    Data Update Frequency: Unknown
    Purpose: These data were collected and derived by the North Carolina Floodplain Mapping Program (www.ncfloodmaps.com) as part of its effort to modernize FEMA Flood Insurance Rate Maps (FIRM) statewide. Although created for specific use in the engineering aspects of floodplain delineation, the data were also developed to address the elevation data requirements of the broader geospatial data user community. The North Carolina Floodplain Mapping Program was established in response to the extensive damage caused by Hurricane Floyd in 1999.
    Use Limitations
    • These data depict the elevations at the time of the survey and are only accurate for that time. 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. Any conclusions drawn from analysis of this information are not the responsibility of NOAA or any of its partners. These data are NOT to be used for navigational purposes.
    Time Period: 2001-01-03  to  2001-03-23
    Spatial Reference System: urn:ogc:def:crs:EPSG::4269 Ellipsoid in Meters
    Spatial Bounding Box Coordinates:
    N: 36.563854
    S: 34.464308
    E: -75.451653
    W: -79.241832
    Spatial Coverage Map:
    Themes
    • LIDAR
    • Lidar
    • Elevation
    • Full return
    • Raw
    • Contour
    • Shapefile
    • ESRI
    • Elevation
    • Flood
    • Floodplain
    • Hydraulic Modeling
    Places
    • North Carolina
    • NC
    • Coastal
    • Neuse River Basin
    • Pasquotank River Basin
    • Tar-Pamlico River Basin
    • White Oak River Basin
    • Beaufort County
    • Camden County
    • Carteret County
    • Chowan County
    • Craven County
    • Currituck County
    • Dare County
    • Durham County
    • Edgecombe County
    • Franklin County
    • Gates County
    • Granville County
    • Greene County
    • Halifax County
    • Hyde County
    • Johnston County
    • Jones County
    • Lenoir County
    • Martin County
    • Nash County
    • Onslow County
    • Orange County
    • Pamlico County
    • Pasquotank County
    • Perquimans County
    • Person County
    • Pitt County
    • Tyrrell County
    • Vance County
    • Wake County
    • Warren County
    • Washington County
    • Wayne County
    • Wilson County
    Use Constraints No constraint information available
    Fees Fee information not available.
    Lineage Statement Lineage statement not available.
    Processor
    • EarthData International of North Carolina
    • EarthData International of North Carolina
    • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Processing Steps
    • 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.
    • 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.
    • The lidar point data were received by the NOAA Coastal Services Center 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. CSC 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. 4. The data were converted to LAZ format.
    • The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp transfer from the NOAA Coastal Services Center. The data are currently being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/. The data can be used to re-populate the system. The data are archived in LAS or LAZ format. The LAS format is an industry standard for LiDAR data developed by the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version of LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most up to date geoid model when transforming to orthometric heights.

    Metadata Last Modified: 2013-02-20

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