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2007 Northwest Florida Water Management District (NWFWMD)Lidar: Holmes County

browse graphicThis kmz file shows the extent of coverage for the 2007 NWFWMD Holmes, County, FL lidar data set.
LIDAR-derived binary (.las) files containing points classified as bare-earth and canopy (first return) were produced for the 2007/2008 Northwest Florida Water Management District - 5 Counties (Calhoun, Holmes, Washington, Jackson and Liberty), Florida lidar mapping project. The files were provided in a scheme of FDEM-derived 5,000 x 5,000 foot (1500 x 1500 meter) tiles. When initially processed, horizontal mapping units were in UTM meters, vertical mapping units are in U.S. survey feet. The total mapping area covers approximately 2102 square miles.

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    Distribution Formats
    • LAZ
    Distributor Distributor information not available
    Point of Contact Mr. John Crowe
    Northwest Florida Water Management District (NWFWMD)
    850-539-5999
    John.Crowe@nwfwmd.state.fl.us
    Documentation links not available.
    Originator
    • Northwest Florida Water Management District (NWFWMD)
    Publisher
      Date(s)
      • publication: 2011-04-01
      Data Presentation Form: Digital image
      Dataset Progress Status Complete
      Data Update Frequency: As needed
      Purpose: FEMA map modernization, digital elevation model, planning, topographic interpretation
      Time Period: 2007-11-12  to  2008-01-20
      Spatial Reference System:
      Spatial Bounding Box Coordinates:
      N: 31.006
      S: 30.694
      E: -85.482
      W: -86.053
      Spatial Coverage Map:
      Themes
      • Bathymetry/Topography
      • LIDAR
      • digital surface model
      • elevation
      • bare earth
      • canopy
      • binary
      • classified
      Places
      • Northwest Florida Water Management District
      • NWFWMD
      • Jackson County
      • Florida
      • USA
      • Calhoun County
      • Holmes County
      • Washington County
      • Liberty County
      Use Constraints No constraint information available
      Fees Fee information not available.
      Source Datasets
      • Ground Control
        • Description of Source: Source Contribution: Ground Control. GPS control network for LIDAR acquisition and processing.Source Type: spreadsheet
        • Temporal extent used:  unknown  to 
      Lineage Statement Lineage statement not available.
      Processor
      • Merrick & Company
      • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Processing Steps
      • LIDAR data was collected using Merrick's ALS50 Phase 2 sensor. The raw data was verified in MARS software for complete coverage of the project area, and bore sighted to align the flight lines. Raw data files were parsed into manageable client-specific tiles. These tiles were then processed through automated filtering that separates the data into different classification groups: error points, ground points, and canopy/building points. The data was next taken into a graphic environment to reclassify the erroneous points that may remain in the LIDAR point cloud after auto filter.
      • The NOAA Coastal Services Center (CSC) received the lidar files in las format. The files contained lidar intensity and elevation measurements. CSC performed the following processing for data storage and Digital Coast provisioning purposes: 1. Data converted from UTM coordinates to geographic coordinates. 2. Data converted from NAVD88 heights to ellipsoid heights using GEOID03. 3. The LAS data were sorted by latitude and the headers were 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: 2013-06-07

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