2007 Northwest Florida Water Management District (NWFWMD)Lidar: Holmes County
This 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.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||Mr. John Crowe
Northwest Florida Water Management District (NWFWMD)
Documentation links not available.
- Northwest Florida Water Management District (NWFWMD)
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||FEMA map modernization, digital elevation model, planning, topographic interpretation
||2007-11-12 to 2008-01-20
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- digital surface model
- bare earth
- Northwest Florida Water Management District
- Jackson County
- Calhoun County
- Holmes County
- Washington County
- Liberty County
| Use Constraints
|| No constraint information available
|| Fee information not available.
- Description of Source: Source Contribution: Ground Control. GPS control network for LIDAR acquisition and
processing.Source Type: spreadsheet
- Temporal extent used:
|| Lineage statement not available.
- Merrick & Company
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
| 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
Metadata Last Modified: 2013-06-07
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