2001 North Carolina Floodplain Mapping Program (NCFMP) Lidar: Phase 1A (Neuse, Pasquotank,
Tar-Pamlico, White Oak River Basins)
This 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.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||NC Floodplain Mapping Program
Documentation links not available.
- Floodplain Mapping Program, North Carolina Division of Emergency Management
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
||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.
||2001-01-03 to 2001-03-23
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Full return
- Hydraulic Modeling
- North Carolina
- 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
|| Fee information not available.
|| Lineage statement not available.
- EarthData International of North Carolina
- EarthData International of North Carolina
| 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
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
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
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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