2007 Lake County Board of County Commissioners Topographic LiDAR: Lake County, Florida
This kmz file shows the extent of coverage for the 2007 Lake County, Florida lidar
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.
|Search and Download
|| Distributor information not available
| Point of Contact
Lake County Board of County Commissioners, Department of Information Technology, GIS
Documentation links not available.
- Lake County Board of County Commissioners, Department of Information Technology, GIS
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||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.
|| Unknown to Unknown
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Lake County
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| 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
- 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
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: 2013-04-25
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