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2004 Florida Division of Emergency Management (FDEM) Lidar: Portion of Flagler County

This metadata record describes the LiDAR data that was collected for 147 square miles within part of Flagler County, Florida during 28 February - 5 May 2004. In 2008, because the final lidar dataset satisfied the accuracy requirements in the FDEM Baseline Specifications, the lidar data was processed into .LAS files, and breaklines and contours were generated for the Florida Division of Emergency Management (FDEM) using the existing lidar data from 2004.

Cite this dataset when used as a source.

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    Distribution Formats
    • LAZ
    Distributor Distributor information not available
    Point of Contact Florida Division of Emergency Management (FDEM)
    850-413-9969
    Associated Resources
    • Lidar Dataset Supplemental Information
    Originator
    • Florida Division of Emergency Management (FDEM)
    Publisher
      Date(s)
      • publication: 2009-01-01
      Data Presentation Form: Digital image
      Dataset Progress Status Complete
      Data Update Frequency: As needed
      Purpose: Used in conjunction with breaklines to determine a DTM surface. The DTM was developed to support the Florida Division of Emergency Management (FDEM) development and maintenance of Regional Evacuation Studies (Study), which include vulnerability assessments and assist disaster response personnel in understanding threats to Florida's citizens and visitors.
      Time Period: 2004-02-28  to  2004-05-05
      Spatial Reference System:
      Spatial Bounding Box Coordinates:
      N: 29.671515
      S: 29.325883
      E: -81.101503
      W: -81.506793
      Spatial Coverage Map:
      Themes
      • Bathymetry/Topography
      • DTM
      • Elevation
      • Lidar
      Places
      • United States
      • Florida
      • Flagler County
      Use Constraints No constraint information available
      Fees Fee information not available.
      Lineage Statement Lineage statement not available.
      Processor
      • Merrick & Co
      • Merrick & Co
      • Merrick & Co
      • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Processing Steps
      • The ABGPS, IMU, and raw Leica ALS40 LiDAR data are integrated with Leica's Incorporated ALS Post Processor software. The resultant file is in a LAS binary file format. The LAS file version 1.1 format 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 HARN horizontal datum and NAVD88 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.
      • 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
      • Ground points were extracted from the LiDAR dataset and converted to a multipoint feature class using ArcGIS.
      • 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 to make it available within Digital Coast: 1. The data were converted from State Plane Florida East coordinates to geographic coordinates. 2. The data were converted from NAVD88 heights to ellipsoid heights using Geoid03. 3. The LAS header fields were sorted by latitude and updated.
      • 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: 2013-05-07

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