2009 Northwest Florida Water Management District (NWFWMD)Lidar: Leon County
This kmz file shows the extent of coverage for the March 2009 NWFWMD Leon County,
FL lidar data set.
This dataset is part of a regularly scheduled update of planimetric, hydrographic,
and topographic features. The dataset was created from source imagery acquired by
a Leica ADS40 multispectral scanner and LAS data acquired by a Leica ALS50 Phase I
Lidar sensor from January 31, 2009 through February 6, 2009.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||Mr. Greg Mauldin
Documentation links not available.
- Northwest Florida Water Management District (NWFWMD)
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||LAS classifications: 1 = Unclassified 2 = Ground 7 = Noise 9 = Water 10 = Swamp
||TLCGIS regularly uses digital orthophotos and planimetric/hydrographic/topographic
data to support regulatory functions, land management and acquisition, planning, engineering
and habitat restoration projects.
|| Unknown to Unknown
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Northwest Florida Water Management District
- Leon County
| Use Constraints
|| No constraint information available
|| Fee information not available.
- Description of Source: Source Contribution: Ground control data. Horizontal and vertical control was used
to establish positions and elevations for reference and correlation purposes and as
input to the aerotriangulation process. Control consists of Airborne GPS/IMU and ground
control points for ground reference. Source Type: digital files
- Temporal extent used:
|| Lineage statement not available.
- Merrick and Company
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
| Processing Steps
- Lidar data was collected using Leica's ALS50 Phase I 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: unclassified points, ground points, "noise"
points and water. The data was next taken into MARS 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 State Plane 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
Metadata Last Modified: 2013-05-09
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