2001 North Carolina Floodplain Mapping Program (NCFMP) Lidar: Phase 1B (Cape Fear
and Lumber 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 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 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
- United States
- North Carolina
- Cape Fear River Basin
- Lumber River Basin
- Alamance County
- Brunswick County
- Bladen County
- Caswell County
- Chatham County
- Columbus County
- Cumberland County
- Duplin County
- Durham County
- Forsyth County
- Guilford County
- Harnett County
- Hoke County
- Johnston County
- Lee County
- Lenoir County
- Montgomery County
- Moore County
- New Hanover County
- Onslow County
- Orange County
- Pender County
- Randolph County
- Robeson County
- Rockingham County
- Richmond County
- Sampson County
- Scotland County
- Wake County
- Wayne County
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| Processing Steps
- 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.
- 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.
- 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: 2013-04-03
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