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Metadata Identifier: gov.noaa.csc.maps:2005_FL_Seminole_m101
MD_DataIdentification
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2005 St. Johns River Water Management District (SJRWMD) Lidar: Western
Seminole County, Florida
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This data set consists of a bare earth data set of 498 files covering a geographic
area of 175 square miles in western Seminole County, Florida and includes small portions
of adjacent Orange and Lake Counties. The lidar data was collected June 5-7, 2005.
This data set seems to contain only model keypoints (points that are a thinned data
set that is intended to remove extraneous data such as trees and points that are deemed
redundant to the final bare earth product) that are classified as ground points. As
a result, there are a lower number of points than in a full mass point lidar data
set; and it is recommended that the data be downloaded as points and used with a TIN
(Triangulated Irregular Network) or similar algorithm to produce a bare earth surface.
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SV_Identification
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2005 St. Johns River Water Management District (SJRWMD) Lidar: Western Seminole County,
Florida
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Lidar Final Reports |
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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/seminole |
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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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Edward C. Beute, PSM, CP |
Aerial Cartographics of America, Inc. |
LiDAR Operations |
e_beute@aca-net.com |
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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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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Paul Finer |
St. Johns River Water Management District (SJRWMD) |
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gis_support@sjrwmd.com |
pointOfContact |
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St. Johns River Water Management District (SJRWMD) |
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originator |
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ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/seminole |
Lidar Final Reports |
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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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-81.486743 |
-81.240467 |
28.875263 |
28.639242 |
2005-06-05 |
2005-06-07 |
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-81.486743 |
-81.240467 |
28.875263 |
28.639242 |
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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 Reports |
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crossReference |
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2005-06-07T00:00:00 |
LiDAR Data Acquisition -- The Lidar data was collected utilizing an
Optech ALTM (Airborne Laser Terrain Mapper) 2025 in a Cessna 208 Grand Caravan aircraft
on June 5, 2005 between 0930 and 1150 hours at an altitude of 3000' AGL. Data was
also collected starting June 6, 2005 at 1830 hours and ending on June 7 at 0900 hours.
The configuration used a scan half-angle of +/-17 degrees, a laser pulse repetition
frequency of 25 kilohertz, and a flying speed of approximately 80 knots. Airborne
GPS using a Novatel dual frequency GPS receiver was accomplished during the flight
session to provide positional information for the Lidar platform. Simultaneous acquisition
of ground base station data was performed using a Novatel and Leica SR9500 dual frequency
receivers for the June 5, 2005 session. Two Leica SR9500 dual frequency GPS receivers
were used for the second session on June 6-7, 2005. Each station remained in operation
for the duration of the project flight. The ground base stations were set up over
National Geodetic Survey (NGS) monuments AK0205 (Designation Number I4 71 A14) and
AK7045 (Designation Number GIS 0472 CAS 1). Positional information on these monuments
was obtained from Data Sheets retrieved from the NGS website (http://www.ngs.noaa.gov).
The GPS data from the ground base stations and the airborne platform were processed
together using Applanix POSPac 4.2 software module POSGPS. All adjustments were referenced
to WGS84. The Inertial Measurement Unit (IMU) solution was accomplished to provide
information regarding the attitude of the Lidar platform using the Applanix POSPac
4.2 software module POSProc. This solution was integrated with the Airborne GPS and
adjusted using a Kalman filter in a forward/reverse solution to provide a Smoothed
Best Estimate of Trajectory (SBET). Laser ranging from the airborne platform was accomplished
using Realm 3.2 processing software to provide XYZ ground positions for each point.
The final horizontal values were output in Universal Transverse Mercator (UTM), Zone
17, units are meters. The horizontal datum conforms to the current Florida High Accuracy
Reference Network (HARN) adjustment for the North American Datum of 1983. The Vertical
Datum is the North American Vertical Datum of 1988 (NAVD88), units are feet.
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2005-07-01T00:00:00 |
Classification of the laser data to extract above ground features
such as buildings and vegetation leaving only bare earth ground points was performed
using Terrasolid Ltd. Terrascan software (Version 003.003). The data was separated
into five (5) separate sets 502 files representing Bald Earth First Pulse, Bald Earth
Last Pulse, Extracted Features First Pulse, Extracted Features Last Pulse, and LAS
format. The Bald Earth Last Pulse best represents the natural ground and is the file
upon which all accuracy statements are based. The Extracted Features First Pulse best
represents the canopy data that includes all features determined to be above the natural
ground.
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2008-11-14T00:00:00 |
The NOAA Coastal Services Center (CSC) received the bare earth files
in ASCII format. The data were Universal Transverse Mercator (UTM), Zone 17, units
in meters, NAVD88 vertical datum and the vertical units of measure were feet. CSC
performed the following processing to the ASCII data to make it available within Digital
Coast: 1. The data were converted from UTM 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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2009-07-20T00:00:00 |
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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