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2008 Northwest Florida Water Management District Lidar: Eglin Air Force Base, Walton County, FL

browse graphicThis kmz file shows the extent of coverage for the 2008 NWFWMD Walton County-Eglin AFB lidar data set.
In the summer of 2008, the Northwest Florida Water Management District collected lidar data over a portion of Walton County, FL (Eglin Air force Base) to support various projects such as floodplain and hazards mapping, wetlands mitigation and stormwater management. The data collection occured in a portion of the county for which there is no prior collected lidar data. Used in conjunction with previously collected data in Walton County (FDEM Lidar collected in 2006), these data support the creation of a county-wide, high resolution, lidar derived digital elevation model(DEM).
Cite this dataset when used as a source.
Online Access
  • Online access is not available for this resource
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
Dataset Point of Contact John B. Crowe
Associate Hydrologist
Northwest Florida Water Management District
(850) 539-5999
John.Crowe@nwfwmd.state.fl.us
Documentation links not available.
Date(s)
  • publication: 2008-08-01
Data Presentation Form: Digital image
Dataset Progress Status Complete
Data Update Frequency: Unknown
Supplemental Information:
Reflective surface data represents the DEM created by laser energy reflected from the first surface encountered by the laser pulse. Some energy may continue beyond this initial surface to be reflected by a subsequent surface as represented by the Last Return data. Intensity information is captured from the Reflective Surface pulse and indicates the relative energy returned to the sensor as compared to the energy transmitted. The Intensity image is not calibrated or normalized but indicates differences in energy absorption due to the interaction of the surface materials with laser energy at the wavelength transmitted by the sensor. Points are classified as water, bare ground or not bare ground to support creation of a bare earth model from the data.
Purpose: To supplement previously collected lidar data in the creation of county-wide, high resolution, lidar derived digital elevation models (DEM).
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.
Originator(s)
  • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
  • Northwest Florida Water Management District (NWFWMD)
Publisher(s)
  • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
Time Period: Unknown to Unknown
Spatial Reference System: urn:ogc:def:crs:EPSG::4269 Ellipsoid in Meters
Spatial Bounding Box Coordinates:
N: 30.605467
S: 30.495943
E: -86.114148
W: -86.323522
Spatial Coverage Map:
Theme keywords
  • Bathymetry/Topography
  • LiDAR
  • Digital Elevation Model
  • LAS
  • topography
  • DEM
Place keywords
  • US
  • Florida
  • Walton County
  • Eglin Air Force Base
Use Constraints No constraint information available
Fees Fee information not available.
Lineage information for: dataset
Processor
  • Sanborn Map Company, Inc
  • 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
  • 2008-06-15T00:00:00 - The ABGPS, IMU, and raw Optech 3100 LiDAR data are integrated into the TerraScan post processor software. The resultant file is in a LAS binary file format. The LAS file version 1.1 formats can be easily transferred from one file format to another. It is a binary file format that maintains information specific to the LiDAR data (return#, intensity value, xyz, etc.). The resultant points are produced in the geodetic coordinates referenced to the NAD83 horizontal datum and GRS80 vertical datum. The date and time for each flight line can be determined using the Julian date and time. The Julian date is a continuous count of days and fractions since noon Universal Time on January 1, 4713 BCE on the Julian calendar.
  • 2008-01-01T00:00:00 - The unedited data are classified to facilitate the application of the appropriate feature extraction filters. A combination of proprietary filters are applied as appropriate for the production of bare earth digital terrain models (dtms). Interactive editing methods are applied to those areas where it is inappropriate or impossible to use the feature extraction filters, based upon the design criteria and/or limitations of the relevant filters. These same feature extraction filters are used to produce elevation height surfaces. The LiDAR mass points were delivered in American Society for Photogrammetry and Remote Sensing LAS 1.1 format. The header file for each dataset is complete as define by the LAS 1.1 specification. In addition the following fields are included: Flight Date Julian, Year, and Class. The LAS files do not include overlap. The data was classified as follows: Class 1 = Unclassified. This class includes vegetation, buildings, noise etc. Class 2 = Ground Class 9 = Water
  • 2008-01-01T00:00:00 - Conversion from Geodetic coordinates, NAD83 into State Plane coordinates (meters) and conversion from ellipsoid heights (meters) into orthometric heights (U.S. Survey Feet).
  • 2011-03-31T00:00:00 - The NOAA Coastal Services Center (CSC) received files in LAS format. The files contained LiDAR intensity and elevation measurements. CSC performed the following processing on the data for data storage purposes and Digital Coast provisioning: 1. The data were converted from State Plane Florida West coordinates to geographic (NAD83) coordinates.; 2. the data were filtered to remove elevation outliers.; 3. The data were converted from NAVD88 heights to ellipsoid heights using Geoid03.; 4. The LAS header fields were sorted by latitude and updated.
  • 2011-05-13T00:00:00 - 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.
Last Modified: 2013-06-05
For questions about the information on this page, please email: mike.sutherland@noaa.gov