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Metadata Identifier: gov.noaa.csc.maps:2004_FL_StJohns_m100
MD_DataIdentification
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2004 St. Johns County, Florida Lidar |
This dataset is the bare earth lidar data for St. Johns County, Florida, acquired
in early January and February of 2004. This data was collected to develop comprehensive
countywide base mapping and perform other GIS enhancements to support master drainage
planning, transportation planning, preliminary engineering and wetland preservation
studies. The surveyed area included all of St. Johns County, approximately 610 square
miles. Eighty-seven (87) flight lines of high density lidar data (average GSD is 3.3
feet) were obtained at an altitude of 3000 feet AGL. This data set contains 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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2004 St. Johns County, Florida Lidar |
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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/st_johns/2004_MTS_Final_Report_stjohns.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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Mike Campbell |
St. Johns County Florida GIS |
St. Johns County GIS Manager |
gis@sjcfl.us |
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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Savo Slijepcevic |
Woolpert, Inc. |
Project Director |
savo.slijepcevic@woolpert.com |
processor |
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St. Johns County, Florida Public Works Department |
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originator |
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ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/st_johns/2004_MTS_Final_Report_stjohns.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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-81.669173 |
-81.212673 |
30.259696 |
29.621896 |
2004-01-17 |
2004-02-07 |
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-81.669173 |
-81.212673 |
30.259696 |
29.621896 |
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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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2004-01-01T00:00:00 |
The LiDAR data was acquired in 93 flight lines acquired in 6 sessions
between January 17 and February 7, 2004 from an altitude of 3,000 feet above ground
level (AGL) to provide an average ground sample distance (GSD) of 3.3 feet. Three
concurrent airborne GPS base stations were used for each acquisition session. The
ABGPS data were reduced using the GrafNav software package by Waypoint Consulting,
Inc. The IMU data was reduced using the PosProc software package by Applanix Corporation.
The initial lidar "point cloud" was derived through the ALS Post Processor software
package by Leica Geosystems. The aircraft, lidar system and associated computer hardware
and software are owned and operated by Woolpert LLP. Once the initial lidar "point
cloud" was derived, Woolpert performed QC to look for any systematic error within
the lidar flights using proprietary software. After systematic error was identified
and removed, the individual lidar flights were clipped to remove overlap between adjacent
flight lines and provide a homogeneous coverage over the project extents. Using the
homogeneous coverage, above ground features were classified and removed using proprietary
software to produce the bare-earth coverage.
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2008-11-03T00:00:00 |
The NOAA Coastal Services Center (CSC) received the files in ASCII
format. The data was in Florida State Plane Projection, NAVD88 vertical datum and
the vertical units of measure were feet. CSC performed the following processing to
the data to make it available within Digital Coast: 1. The data were converted from
Florida State Plane East, Zone 0901 coordinates to geographic coordinates. 2. The
data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights
using Geoid 03. 3. The vertical unit of measure for the data was converted from feet
to meters. 4. 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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