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Metadata Identifier: gov.noaa.csc.maps:2006_northpugetsound_m1451
MD_DataIdentification
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2006 U.S. Geological Survey (USGS) Bare Earth Topographic LiDAR: North
Puget Sound, Washington
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USGS Contract Number: 01CRCN0014 In Spring, 2006 Sanborn was contracted by
the USGS to survey aprocimately 1,735 square miles of western Whatcom and Skagit Counties
in Washington state. All data was collected during ideal conditions (rivers at or
below mean level, leaf off, etc.). For this collect two sensors were used: The Leica
ALS-50 (High Relief Collection) and Optech 2050 (High and Low Relief Collection).
LiDAR calibrations were performed to determine and therefore eliminate systematic
biases that occur between the the two sensors. Once the biases were determined they
were modeled out. The Leica ALS-50 produced an average point spacing of 1.4 meters.
The Optech 2050 produced an average point spacing of 1.3 meters. All points are classified
as Class 2 (Ground) which includes water points and any possibly remaining artifacts.
Leica ALS-50 LiDAR Acquisition Paramters: Avg. Altitude: 1,500 meters AGL Airspeed:
~120 Knots Scan Freq: 36 Hertz Scan Width Half Angle: 36 Degrees Pulse Rate: 60,000
Hertz Overlap: 44-60% Optech 2050 LiDAR Acquisition Parameters: Avg. Altitude: 1,200
meters AGL Airspeed: ~120 Knots Scan Freq: 30 Hertz Scan Width Half Angle: 40 Degrees
Pulse Rate: 50,000 Hertz Overlap: 30-50%
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SV_Identification
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2006 U.S. Geological Survey (USGS) Bare Earth Topographic LiDAR: North Puget Sound,
Washington
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None |
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North American Datum 1983 |
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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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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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DOI/USGS > United States Geological Survey, U.S. Department of the Interior |
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originator |
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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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Mike Sutherland (processor) |
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 |
processor |
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Robert Kelly |
United States Geological Survey, National Geospatial Technical Operations Center (NGTOC) |
USGS NGTOC |
ckelly@usgs.gov |
pointOfContact |
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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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-85.215673 |
-83.908630 |
34.576794 |
32.854996 |
2006-05-05 |
2006-09-03 |
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-85.215673 |
-83.908630 |
34.576794 |
32.854996 |
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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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2006-01-01T00:00:00 |
Final post-processing of LiDAR data involves several steps. The airborne
GPS data was post-processed using Waypoint's GravNAVTM software (version 7.5). A fixed-bias
carrier phase solution was computed in both the forward and reverse chronological
directions. The data was processed for both base stations and combined. In the event
that the solution worsened as a result of the combination of both solutions the best
of both solutions was used to yield more accurate data. The GPS trajectory was combined
with the raw IMU data and post-processed using Applanix Inc.'s POSPROC (version 4.3)
Kalman Filtering software. This results in a two-fold improvement in the attitude
accuracies over the real-time INS data. The best estimated trajectory (BET) and refined
attitude data are then reintroduced into the LEICA ALS post processor or REALM Survey
Suite OPTECH to compute the laser point-positions. The trajectory is then combined
with the attitude data and laser range measurements to produce the 3-dimensional coordinates
of the mass points. All return values are produced within ALS Post Processing software
or REALM Survey Suite OPTECH software. The multi-return information minus the last
return provides a useful depiction of the "canopy" within the project area. The last
return is further processed to obtain the "Bare Earth Dataset" as a deliverable. All
LiDAR data is processed using the binary LAS format 1.0 file format. LiDAR filtering
was accomplished using TerraSolid, TerraScan LiDAR processing and modeling software.
The filtering process reclassifies all the data into classes within the LAS formatted
file based scheme set using the LAS format 1.0 specifications or by the client. Once
the data is classified, the entire data set is reviewed and manually edited for anomalies
that are outside the required guidelines of the product specification or contract
guidelines, whichever apply. The coordinate and datum transformations were then applied
to the data set to reflect the required deliverable projection, coordinate and datum
systems as provided in the contract. The final data is in State Plane Washington North
Coordinate System with the horizontal and vertical units being in feet.
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2013-01-01T00:00:00 |
The NOAA Coastal Services Center (CSC) received topographic file in
ASCII .XYZ format. The files contained lidar elevation measurements. The data were
received in Washington State Plane North Zone 4601, NAD83 coordinates and were vertically
referenced to NAVD88 using the Geoid99 model. The vertical units of the data were
feet. CSC performed the following processing for data storage and Digital Coast provisioning
purposes: 1. The ASCII .XYZ files were converted to LAS version 1.1 using Global Mapper.
2. All points in Class 0 (Never Classified) were changed to Class 2 (Ground). This
includes water points. 3. The topographic las files were converted from orthometric
(NAVD88) heights to ellipsoidal heights using Geoid99. 4. The topographic las files
were converted from a Projected Coordinate System (WA SP North) to a Geographic Coordinate
system (GCS). 5. The topographic las files' vertical units were converted from feet
to meters. 6. The topographic las files' horizontal units were converted from feet
to decimal degrees. 7. The data were converted to LAZ format.
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2013-04-25T00:00:00 |
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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