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Metadata Identifier: gov.noaa.csc.maps:2003_MD_m16
MD_DataIdentification
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2003 Maryland Department of Natural Resources LiDAR: Dorchester, Somerset,
Talbot,and Wicomico Counties, with portions of Caroline, Kent and Queen Anne's Counties
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Light Detection and Ranging (LiDAR) is a method of locating objects on the
ground using aerial-borne equipment. It is similar to RADAR or SONAR in that the two-way
travel time of an energy beam reflected off an object is precisely measured, but this
technology uses laser light instead of radio or sound waves. This technology has proven
very useful in remote sensing of the earth. It can be used for determining elevations
of both the earth's surface and items (natural and man-made) on the surface. Analysis
of LiDAR data is used in detailed modeling of the earth's surface for drainage and
floodplain studies, determining how a new structure will affect views from various
locations, shoreline erosion studies, and other reasons. The bare earth mass points
data show the calculated elevation of the earth's surface (the ground, without objects
such as trees or buildings). Mass points may appear to have "holes" with no elevation
values in areas where the surface could not be determined, such as very dense forests
or urban areas.
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SV_Identification
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2003 Maryland Department of Natural Resources LiDAR: Dorchester, Somerset, Talbot,and
Wicomico Counties, with portions of Caroline, Kent and Queen Anne's Counties
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Lidar QA/QC 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/md/Dorchester_Somerset_Talbot_Wicomico_QA_Report_2003.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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Ken Miller |
Maryland Department of Natural Resources |
Chief. Watershed Information Services Division |
kenmiller@dnr.state.md.us |
pointOfContact |
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Ken Miller |
Maryland Department of Natural Resources |
Director, Watershed Information Services |
kenmiller@dnr.state.md.us |
processor |
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Maryland Department of Natural Resources |
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originator |
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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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ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/md/Dorchester_Somerset_Talbot_Wicomico_QA_Report_2003.pdf |
Lidar QA/QC 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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-76.390925 |
-75.350752 |
39.132246 |
37.892377 |
2003-03-01 |
2003-11-30 |
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-76.390925 |
-75.350752 |
39.132246 |
37.892377 |
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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 QA/QC Report |
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crossReference |
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2004-01-20T00:00:00 |
LIDAR Data Acquisition. Airborne 1, using an Optec 25 mHz system,
flew the project area with the LIDAR sensor. A portion of the 2003 project area included
data acquisition of portions of the LIDAR 2002 project area that had incomplete coverage.
Where overlaps between the two series of data occurred, the newer data was used. No
attempt at blending the two datasets was made to maintain the highest data integrity.
In an effort to permit correlation of the point values with tidal gauge stations,
the Airborne 1 was required to fly tidal shoreline areas during the low tide cycle
(slack water - low tide - slack water) as predicted by local tide stations. The LIDAR
sensor collected raw data that was referenced in UTM. The specifications called for
data collection during leaf-off conditions, which generally run through early to mid
April. However, due to late winter snow cover, windy flight conditions and other technical
obstacles, data acquisitions continued into early June 2003. In addition, a small
area in the north end of the project area was acquired in July. Anticipating the trouble
with leaf density, Airborne 1 modified the flight parameters to increase the laser
light penetration to the ground. The flight plan on this project included the following
specifications to meet the project requirements: *Single pass density - 1.696 square
meters per sample; *Average area sampling density -1.272 square meters per sample;
*Swath width - 996.76 meters; *Flight altitude -1371 meters (4500 ft); *Flight line
spacing - 498.38 meters w/50% overlap; *Scan frequency - 21 Hz; *Firing rate - 25
kHz; *Scan angle - 20 degrees; *Ground speed - 140 knots. When complete, the raw data
was delivered to Spatial Systems.
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2004-01-20T00:00:00 |
LIDAR Data Processing. Computational Consulting Systems. The First
and Last Return data was delivered to CCS in large blocks of data. CCS processed the
data using both the First and Last Returns, removed artifacts using automated and
manual techniques, reprojected the data into the client-specified X,Y,Z text files
using the 1200 meter x 1800 meter tiles, NAD 83 meters, NAVD 88 meters. CCS also generated
the Intensity Imagery using the client-specified USGS 3.75' tiling scheme. The data
products were delivered to SSA for quality assurance testing, formatting and final
delivery.
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2004-01-20T00:00:00 |
LIDAR Data Post Processing. Spatial Systems Associates. SSA digitized
the shoreline from the Intensity Imagery for the purposes of delineating a shoreline.
Any LIDAR points that fell seaward of this shoreline were assigned the value of zero
(0). In addition to the shoreline, SSA delineated upland ponds using the same technique
and assigned all LIDAR points that fell within the water area the value of the lowest
observed point close to the shore. The observed elevation values were not lost - a
fourth field in the data file was added for the assigned value. SSA also performed
a variety of QA procedures to determine if the point density was within expected ranges;
that each tile was completely filled; that all tiles were accounted for, and that
the tiles were named in accordance with client specifications.
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2004-01-20T00:00:00 |
LIDAR Data Check Point Surveys. NXL Construction Services. NXL was
contracted to acquire the check-points in the 5 different land cover classes. SSA
provided NXL with maps of each area where a check-point was to be located. The points
were scattered throughout the project area. NXL was permitted the latitude to select
the exact location based on field conditions, provided the points were generally within
a 1 mile radius of the chosen location and that the land cover class was the same
as the one specified. The land cover classes were: Grass/Ground, High Grass/Crops,
Brush/Low Trees, Forest, and Urban/Pavement.
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2004-01-20T00:00:00 |
LIDAR Data Quailty Assurance. Dewberry LLC was provided with the check-point
and LIDAR Bare Earth Mass Points data to perform their independent quality assurance
work. They performed detailed analyses to determine if the vertical accuracy with
within specifications and examined the data for flight, data collection and processing
inconsistencies. Neither the flight vendor (Airborne 1) nor the processing vendor
(CCS) was given access to the check-point data. The entire accuracy report can be
found at <http://dnrweb.dnr.state.md.us/gis/data/lidar>.
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2004-05-28T00:00:00 |
The NOAA Coastal Services Center (CSC) received ASCII files containing
the bared-earth elevation and intensity data from Maryland Department of Natural Resources.
CSC performed the following processing on the data to make it available within the
Lidar Data Retrieval Tool (LDART): 1. The data were projected from Maryland State
Plane coordinates to geographic decimal degrees using the General Cartographic Transformation
Package. 2. The lat, lon, MODZVAL and intensity values where extracted from the ascii
files and converted to the LDART binary format. 3. The data were converted to xyz
text files
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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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