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Metadata Identifier: gov.noaa.csc.maps:2004_CT_m20
MD_DataIdentification
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2004 Connecticut Lidar |
LIDAR data is remotely sensed high-resolution elevation data collected by
an airborne collection platform. Using a combination of laser rangefinding, GPS positioning
and inertial measurement technologies; LIDAR instruments are able to make highly detailed
Digital Elevation Models (DEMs) of the earth's terrain, man-made structures and vegetation.
This data was collected at submeter resolution to provide nominal 1m spacing of collected
points. Two returns were recorded for each pulse in addition to an intensity value.
This data set is a raster file of z values with 153 columns and 61 rows. The data
set was generated from a larger data set and includes all valid points within the
requested geographic bounds.
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SV_Identification
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2004 Connecticut Lidar |
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Collection System Calibration |
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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/ct/20040415_QA_REPORT_Connecticut.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 (pointOfContact) |
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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 |
pointOfContact |
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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 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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Woolpert LLP |
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originator |
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ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/ct/20040415_QA_REPORT_Connecticut.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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-72.908092 |
-72.279933 |
41.453890 |
41.240042 |
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-72.908092 |
-72.279933 |
41.453890 |
41.240042 |
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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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Collection System Calibration |
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Source Contribution: System Calibration. Minimizes horizontal error
caused by IMU mis-alignment by checking over known range and by comparing positional
results from adjacent flight lines to compute error adjustment function. Source Type:
Validation Report
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2004-10-01T00:00:00 |
Data Collection: Using a LH Systems ALS50 Light Detection And Ranging
(LiDAR) system, 41 flight lines of high density (submeter ground sample distance)
data were collected over areas in coastal Connecticut (approximately 300 square kilometers).
Two returns were recorded for each laser pulse along with an intensity value for each
return. The data acquisition occurred in one (1) mission on October 8, 2004. Three
(3) airborne global positioning system (GPS) base stations were used to support the
LiDAR data acquisition: Moriches 1 continuously operating reference station (CORS)
ARP, NGS point P36, and one station Woolpert located using static GPS positioning
methods, Madison CP. In addition, twenty-two control points were surveyed through
fast-static GPS methods to support the final accuracy analysis and tied into the National
Geodetic Survey (NGS) points Moriches CORS and P36.
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2004-11-01T00:00:00 |
Airborne GPS Processing: Airborne GPS data was differentially processed
and integrated with the post processed IMU data to derive a smoothed best estimate
of trajectory (SBET). The SBET was used to reduce the LiDAR slant range measurements
to a raw reflective surface for each flight line. The overlap between flight lines
was removed to provide a homogeneous coverage, and the coverage was classified to
extract a bare earth digital elevation model (DEM). Airborne GPS is differentially
processed using the GrafNAV V4.10 software by Waypoint Consulting of Calgary, Alberta,
Canada. The PDOP and distance separation is as follows: P36: Maximum PDOP = 3.58 (maximum)
Average Distance Separation: 17 km Madison CP: Maximum PDOP = 3.58 (maximum) Average
Distance Separation: 19 km IMU data is processed using the PosPac V4.2 software by
Applanix Corporation of Richmond Hill, Ontario, Canada. The reflective surface is
derived using the ALS Post Processor software by Leica Geosystems GIS & Mapping Division
of Atlanta, Georgia. The classification and quality control (QC) of LiDAR data is
carried out using a combination of proprietary software and TerraScan software by
Terrasolid Limited of Helinski, Finland. Two (2) coverages were delivered in the LAS
file format: bare-earth and above ground features.
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2004-11-01T00:00:00 |
IMU data Processing: IMU data provides information concerning roll,
pitch and yaw of collection platform during collection event. IMU information allows
the pulse vector to be properly placed in 3D space allowing the distance from the
aircraft reference point to be properly positioned on the elevation model surface.
IMU data is processed using the PosPac V4.2 software by Applanix Corporation of Richmond
Hill, Ontario, Canada.
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2004-11-01T00:00:00 |
Reflective Surface Generation: The reflective surface is derived using
the ALS Post Processor software by Leica Geosystems GIS & Mapping Division of Atlanta,
Georgia.
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2004-12-01T00:00:00 |
LIDAR Point Classification The classification and quality control
(QC) of LiDAR data is carried out using a combination of proprietary software and
TerraScan software by Terrasolid Limited of Helinski, Finland.
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2005-01-01T00:00:00 |
Output LAS Files Random LIDAR points maintained in UTM coordinate
system converted to Geographic projection with units of Decimal Degrees
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2006-01-03T00:00:00 |
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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2006-09-27T00:00:00 |
The NOAA Coastal Services Center (CSC) received files in LAS format.
The files contained LiDAR intensity and elevation measurements. CSC performed the
following processing on the data to make it available within the LiDAR Data Retrieval
Tool (LDART): 1. The las files were converted from State Plane coordinates to Geographic
coordinates. 2. The las header fields were sorted by latitude and updated. 3. The
data were converted from orthometric to ellipsoidal heights using Geoid03.
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