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Metadata Identifier: gov.noaa.csc.maps:2007_FL_SWFWMD_Hernando_m78
MD_DataIdentification
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2007 Southwest Florida Water Management District (SWFWMD) LiDAR: Hernando
County
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This dataset is one component of a digital terrain model (DTM) for the Southwest
Florida Water Management Districts FY2006 Digital Orthophoto (B089) and LiDAR Project
(L776) encompassing approximately 462 square miles in Hernando County, Florida. This
dataset is comprised of 530 LiDAR files, based on the DISTRICT 5,000' by 5,000' sheet
index system in the LAS version 1.1 file format. LiDAR acquisition dates were January
11 through January 16, 2007. The raw data was collected at an average ground sample
distance of 2.1 feet. Other components of the DTM include a personal geodatabase in
accordance with the SWFWMD 2006 Topographic Database Design containing: obscured vegetation
polygons; road overpass polygons; road breaklines; soft feature breaklines; water
body polygons; coastal shorelines; hydrographic features breaklines; island polygons;
and 1-foot contours. Final products include FEMA-compliant LIDAR-derived DTM data
and 1-foot contours (for cartographic visualization purposes only) meeting or exceeding
National Map Accuracy Standards for 2-foot contours.
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SV_Identification
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2007 Southwest Florida Water Management District (SWFWMD) LiDAR: Hernando County |
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Lidar Final Report |
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None |
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North American Datum 1983 |
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resourceProvider |
http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4269 |
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Citation URL |
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ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/swfwmd/Hernando_County_Final_Report.pdf |
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NOAA CSC (originator) |
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DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic
and Atmospheric Administration, U.S. Department of Commerce
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csc.info@noaa.gov |
originator |
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NOAA CSC (publisher) |
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DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic
and Atmospheric Administration, U.S. Department of Commerce
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csc.info@noaa.gov |
publisher |
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NOAA CSC(distributor) |
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DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic
and Atmospheric Administration, U.S. Department of Commerce
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csc.info@noaa.gov |
distributor |
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NOAA CSC (processor) |
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DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic
and Atmospheric Administration, U.S. Department of Commerce
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csc.info@noaa.gov |
processor |
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EPSG Registry |
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European Petroleum Survey Group |
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publisher |
http://www.epsg-registry.org/ |
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John Gerhard |
Woolpert, Inc. |
Project Manager |
john.gerhard@woolpert.com |
processor |
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Mapping and GIS |
Southwest Florida Water Management District |
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pointOfContact |
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Mike Sutherland(author) |
Mike Sutherland |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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mike.sutherland@noaa.gov |
author |
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Mike Sutherland |
Mike Sutherland |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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mike.sutherland@noaa.gov |
distributor |
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Pamela Grothe |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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processor |
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Southwest Florida Water Management District (SWFWMD) |
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originator |
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ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/swfwmd/Hernando_County_Final_Report.pdf |
Lidar Final Report |
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information |
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http://www.epsg-registry.org/ |
European Petroleum Survey Group Geodetic Parameter Registry |
Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured
dataset of Coordinate Reference Systems and Coordinate Transformations.
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search |
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http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4269 |
NAD83 |
Link to Geographic Markup Language (GML) description of reference system. |
information |
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Ellipsoid in Meters |
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urn:ogc:def:crs:EPSG::4269 |
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Bounding Box |
Temporal Extent |
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-81.925929 |
-81.848175 |
28.350110 |
28.308789 |
2007-01-11 |
2007-01-16 |
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-81.925929 |
-81.848175 |
28.350110 |
28.308789 |
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Lidar Use Limitation |
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.
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Ellipsoid |
Ellipsoid in Meters |
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NAD83 |
urn:ogc:def:crs:EPSG::4269 |
North American Datum 1983 |
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Lidar Final Report |
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crossReference |
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2007-01-01T00:00:00 |
The LiDAR data was acquired using a Leica ALS50 from an average altitude
of 2,400-feet above ground level to provide an average ground sample distance of 2.1-feet.
First and last return data was collected along with the signal return intensity. Two
redundant airborne GPS bases stations were utilized during the data acquisition with
maximum line-of-sight distance between the base station and aircraft of 20-km. The
LiDAR data was reduced using Grafnav (Waypoint Consulting) for GPS post-processing,
PosProc (Applanix Crop) for IMU processing, ALS50 Post Processor (LH Systems) to initial
LiDAR processing, TerraScan (Terrasolid) for initial point classification, and proprietary
Woolpert developed software for refining the point classification and QC. The LiDAR
data was reviewed in 3D using a digital photogrammetric work station using ADS40 digital
stereo imagery. During the production process, LiDAR data gaps between the flight
lines were observed. These gaps between flight lines were corrected by adding photogrametrically
compiled mass points. These points are classified as class 10, in the LAS file. In
the areas with the compiled mass points, it may be noted that the mass points are
not as dense the areas with complete LiDAR coverage. The mass points were compiled
at a sufficient density to define the surface to contract specifications. The LAS
files contain 5 classifications: 1 = unclassified; 2 = ground; 9 = water; 10 = photogrammetric
masspoints; and 11 = swamp and/or wetlands. The class 1 consists of all points not
on the ground. Class 2 consists of bare earth points. Class 9 consists of points within
water polygons. Class 11 consists of points within swamps and/or wetlands. Class 10
consists of supplementary mass points that were photogrametrically compiled on points
features such as peaks or pits, and LiDAR data gaps. These points were created to
maintain the accuracy of the DTM. 3D breaklines were collected at the digital photogrammetric
workstation during the LiDAR data review. These breaklines were delineated to insure
the DTM is hydrologically correct. Hydrologically Enforced Elevation Data is defined
as "Hydorenforced TINS, DEMS, or contours ensure that top surfaces of bridges and
culverts are cut by stream breaklines so that computer models will accurately represent
drainage flow" per FEMA's Appendix A A.4.10. The breaklines were collected for hydrologically
significant features as appropriate to support the development of the generation of
2-foot contours meeting National Map Accuracy Standards. The following breakline features
were classified and separated: Closed Water Body Features, Linear Hydrographic Features,
Coastal Shorelines, Road Features, Soft Features, Obscured Vegetated Areas, Island
Features, Overpasses, and Bridges. Per contract specifications, culverts were not
collected as part of this project. Therefore continuity of hydrographic features may
not be consistent. During final data production and analysis, the occurrence of mound
type features in the data set was noted. These areas were checked, and verified to
be above ground septic systems. For a complete description of survey methods, processing
methods, software, system parameters, and accuracy analysis, see the Florida MTS Report
of Specific Purpose Survey, SWFWMD MTS Report of DOI Survey, FY2007 Digital Orthophoto
and LiDAR (B089 & L776 (dated 4/31/2008).
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2008-04-24T00:00:00 |
The NOAA Coastal Services Center (CSC) received the files in LAS format.
The files contained Lidar intensity and elevation measurements. The data was in Florida
State Plane Projection and NAVD88 vertical datum. CSC performed the following processing
to the data to make it available within the LDART Retrieval Tool (LDART): 1. The data
were converted from Florida State Plane West coordinates to geographic coordinates.
2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid)
heights using Geoid 03. 3. The LAS data were sorted by latitude and the headers were
updated.
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2009-07-14T00:00:00 |
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.
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