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2007 Lake County Board of County Commissioners Topographic LiDAR: Lake County, Florida

browse graphicThis kmz file shows the extent of coverage for the 2007 Lake County, Florida lidar data set.
This metadata document describes the LiDAR point data in LAS format produced by Kucera covering the project area of Lake County, FL. The data produced is satisfactory for the generation of both 1' and 2' contours. The average point spacing for all tiles is estimated to be 1 meter.

Cite this dataset when used as a source.

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    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
    Point of Contact Kevin Willis
    Lake County Board of County Commissioners, Department of Information Technology, GIS Division
    352-343-9791
    kwillis@lakecountyfl.gov
    Documentation links not available.
    Originator
    • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    Originator
    • Lake County Board of County Commissioners, Department of Information Technology, GIS Division
    Publisher
    • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    Date(s)
    • publication: 2013-01-01
    Data Presentation Form: Digital image
    Dataset Progress Status Complete
    Data Update Frequency: As needed
    Purpose: LiDAR points depict the 'bald earth' within the project area. All points not specifically derived from the terrain are removed (tree canopy, buildings, etc.). As such, the file is useful for a variety of applications, such as aiding in contour generation and the production of orthophotos.
    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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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.
    Time Period: Unknown  to  Unknown
    Spatial Reference System: urn:ogc:def:crs:EPSG::4269 Ellipsoid in Meters
    Spatial Bounding Box Coordinates:
    N: 29.283727
    S: 28.332972
    E: -81.347519
    W: -81.964340
    Spatial Coverage Map:
    Themes
    • Topography/Bathymetry
    • Elevation
    • Lidar
    • LAS
    Places
    • Florida
    • Lake County
    • Tavares
    Use Constraints No constraint information available
    Fees Fee information not available.
    Lineage Statement Lineage statement not available.
    Processor
    • 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
    • At selected locations throughout the site, accurate GPS coordinates and elevations are surveyed and the points are marked with targets.
    • New LiDAR data is captured for the project area using a Leica ALS50 LiDAR instrument in conjunction with a POSAV Applanix GPS/INS system mounted within a Piper Navajo twin prop airplane. Base-station receivers are operated on the ground over known site points during the flyover to provide data necessary to reference the instrument position and orientation measurements to the terrain coordinate system. Altitude of flight was 6315' above mean sea level (AMSL).
    • The airborne GPS/INS data is processed, in both forward and reverse directions, together with the simultaneously recorded ground-based GPS base station data to determine the LiDAR sensor's angle and orientation in the terrain (project) coordinate datum during the survey.
    • LiDAR data is processed using the GPS/INS solution. Data is classified to produce a 'bald earth' surface and output to a LAS binary file format.
    • The NOAA Coastal Services Center (CSC) received topographic files in LAS format. The files contained lidar elevation and intensity measurements. The data were received in Florida State Plane East (Zone 0901) Coordinates and were vertically referenced to NAVD88 using the Geoid03 model. The vertical units of the data were survey feet. CSC performed the following processing for data storage and Digital Coast provisioning purposes: 1. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid03. 2. The topographic las files were converted from Florida State Plane East (survey feet) to Geographic coordinates (decimal degrees). 3. 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 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: 2013-04-25

    For questions about the information on this page, please email: mike.sutherland@noaa.gov