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Metadata Identifier: gov.noaa.csc.maps:2002_Texas_m13
MD_DataIdentification
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2002 Upper Texas Coast Lidar Point Data, Gulf of Mexico Shoreline in the
Northeast 3.75-Minute Quadrant of the Lake Como 7.5-Minute Quadrangle: Post Fay Survey
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This data set contains elevation data derived from a lidar survey approximately
300m wide of the Gulf of Mexico shoreline in the Northeast Lake Como quarter-quadrangle
on Galveston Island Texas. The geographic extent of the data set is equivalent to
the quarter-quadrangle plus 30 meters of overedge. The data is created by combining
data collected using an Optech Inc. Airborne Laser Terrain Mapper (ALTM) 1225 in combination
with geodetic quality Global Positioning System (GPS) airborne and ground-based receivers.
The Bureau of Economic Geology, the University of Texas at Austin owns and operates
an ALTM 1225 system (serial number 99d118). This system is installed in a single engine
Cessna 206 (tail number N4589U) owned and operated by the Texas State Aircraft Pooling
Board. The lidar data described by this document was collected on 18 September 2002
(26102) between 20:34 and 00:08 UTC (actual data collection). Conditions on that day
were low clouds at 335m Above Ground Level (AGL), haze, and occasional showers. 99d118
instrument settings for this flight were; laser pulse rate: 25kHz, scanner rate: 26Hz,
scan angle: +/-20deg, beam divergence: wide, altitude: 300-490m AGL, and ground speed:
70-106kts. Three GPS base stations, 2 Ashtech and 1 Trimble 4000SSI receivers (backup),
were operating during the survey. The three base stations were at the following locations:
one 3.5km south of San Luis Pass, one at the Scholes International Airport Galveston,
and one on the seawall at Rollover Pass. This data set consists of 1687100 records
of x,y, and z values. 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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2002 Upper Texas Coast Lidar Point Data, Gulf of Mexico Shoreline in the Northeast
3.75-Minute Quadrant of the Lake Como 7.5-Minute Quadrangle: Post Fay Survey
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Air and Ground GPS files from 26102 |
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None |
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North American Datum 1983 |
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Raw lidar data output from ALTM 1225 |
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none |
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resourceProvider |
http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4269 |
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Bureau of Economic Geology, University of Texas at Austin |
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originator |
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Bureau of Economic Geology, University of Texas at Austin |
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pointOfContact |
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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 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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Roberto Guiterrez and John Andrews |
Bureau of Economic Geology, The University of Texas at Austin |
Research Associate and Research Scientist Associate |
Roberto: oskar@mail.utexas.edu John: john.andrews@beg.utexas.edu |
processor |
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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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-95.568694 |
-93.831419 |
29.688483 |
28.797218 |
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-95.568694 |
-93.831419 |
29.688483 |
28.797218 |
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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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Air and Ground GPS files from 26102 |
2002-09-18 |
Source Contribution: GPS data. Air and ground GPS files Source Type:
digital file
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Raw lidar data output from ALTM 1225 |
2002-09-18 |
Source Contribution: Raw lidar data files. Raw lidar data from ALTM
1225 Source Type: digital file
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2003-02-11T00:00:00 |
Transfer raw ALTM 1225 flight data, airborne GPS data collected at
1 Hz using Ashtech receiver, and ground-based GPS data collected at 1 Hz using Ashtech
and Trimble 4000SSI receivers to NT workstation. Generate decimated lidar point file
from above three data sets using Optech's Realm 2.27 software. This is a 9-column
ASCII data set with the following format: time tag; first pulse Easting, Northing,
HAE; last pulse Easting, Northing, HAE; first pulse intensity; and last pulse intensity.
View decimated lidar point file to check data coverage (i.e. sufficient overlap of
flight lines and point spacing). Compute base station coordinates using National Geodetic
Survey's PAGES software. Computed aircraft trajectories for both base stations using
National Geodetic Survey's KINPOS software. Coordinates for base stations and trajectories
are in the International Terrestrial Reference Frame of 2000 (ITRF2000) datum. Trajectories
from both base stations were merged into one. Weighting for trajectory merge is based
upon baseline length (distance from base station) and solution RMS. Transformed trajectory
solution from ITRF2000 to North American Datum of 1983 (NAD83). Use NAD83 trajectories
and aircraft inertial measurement unit data in Applanix's POSProc version 2.1.4 to
compute an optimal 50Hz inertial navigation solution. Substitute the aircraft position
and attitude information from the inertial navigation solution into Realm 2.27. Extract
calibration area data set from lidar point file for quality control and instrument
calibration checks. If necessary, use multiple iterations to adjust calibration parameters
(pitch, roll, and scale) and reprocess sample data set. Then generate entire lidar
point file (9-column ASCII file). Transfer point file from NT workstation to UNIX
workstation. Parse the 9-column lidar point file into 3.75-minute quarter-quadrangle
components and apply elevation bias correction (determined during calibration step).
There are some points in the file that only contain 5-columns. These are points that
either the first or last pulse was not recorded. Processing done over 20020918-20030211.
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2003-02-24T00:00:00 |
The 9-column post-processed data from University of Texas were provided
in UTM projection (Zone 15) referenced to NAD83 with vertical elevations in meters
referenced to the Geodetic Reference System 80 (GRS80) ellipsoid. The xyz values for
the last return were extracted from the 9-column file. The data were converted to
geographic coordinates using General Cartographic Transformation Program software
developed by the United States Geological Survey. A vertical datum transformation
was performed to convert vertical elevations referenced to GRS80 ellipsoid to NAVD88
using National Geodetic Survey (NGS) GEOID99 grids. The data were then converted to
a binary format and loaded into the LIDAR Data Retrieval Tool (LDART) database.
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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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