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Metadata Identifier: gov.noaa.csc.maps:2007_OR_DOGAMI_m82
MD_DataIdentification
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2007 Oregon Department of Geology and Mineral Industries (DoGAMI) LiDAR:
Northwest Oregon and Portland Metro Area
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Watershed Sciences, Inc. collected Light Detection and Ranging (LiDAR) data
for the Oregon Department of Geology and Mineral Industries (DoGAMI) and the Oregon
Department of Forestry (ODF) between March 15 and November 7 2007. This data set has
bare earth and unclassified points. The dataset encompasses portions of the following
counties in northwest Oregon: Multnomah, Marion, Hood River, Clackamas, Columbia,
Washington and Yamhill. Areas of interest within this data set are the Portland Metro
area, Mt. Hood and Silver Falls State Park. There is approximately 8 points per square
meter over terrestrial surfaces. In some areas of heavy vegetation or forest cover,
there may be relatively few ground points in the LiDAR data. Elevation values for
open water surfaces are not valid elevation values because few LiDAR points are returned
from water surfaces. Lidar intensity values were also collected.
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SV_Identification
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2007 Oregon Department of Geology and Mineral Industries (DoGAMI) LiDAR: Northwest
Oregon and Portland Metro Area
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Lidar Final Reports |
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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/or/dogami |
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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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Ian Madin |
DoGAMI |
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ian.madin@dogami.state.or.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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Oregon Department of Geology and Mineral Industries (DoGAMI) |
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originator |
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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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Watershed Sciences, Inc. |
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watershedsciences.com |
processor |
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ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/or/dogami |
Lidar Final Reports |
The data are organized by "delivery". Each delivery has a corresponding report. |
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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-123.165316 |
-121.611916 |
45.904818 |
44.943718 |
2007-03-15 |
2007-11-07 |
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-123.165316 |
-121.611916 |
45.904818 |
44.943718 |
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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 Reports |
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crossReference |
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2007-01-01T00:00:00 |
Acquisition. The LiDAR data was collected between March 15 and November
11, 2007. The survey used a Leica ALS50 Pase II laser system mounted in a Cessna Caravan
208, and an Optech 3100 laser system mounted in a Cessna Caravan 208. Near nadir scan
angles were used to increase penetration of vegetation to ground surfaces. Ground
level GPS and aircraft IMU were collected during the flight.
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2008-01-01T00:00:00 |
Processing. 1. Flight lines and data were reviewed to ensure complete
coverage of the study area and positional accuracy of the laser points. 2. Laser point
return coordinates were computed using ALS Post Processor software, IPAS Pro GPS/INS
software, REALM survey suite, and PosPac software, based on independent data from
the LiDAR system, IMU, and aircraft. 3. The raw LiDAR file was assembled into flight
lines per return with each point having an associated x, y, and z coordinate. 4. Visual
inspection of swath to swath laser point consistencies within the study area were
used to perform manual refinements of system alignment. 5. Custom algorithms were
designed to evaluate points between adjacent flight lines. Automated system alignment
was computed based upon randomly selected swath to swath accuracy measurements that
consider elevation, slope, and intensities. Specifically, refinement in the combination
of system pitch, roll and yaw offset parameters optimize internal consistency. 6.
Noise (e.g., pits and birds) was filtered using ALS postprocessing software and REALM
software tools, based on known elevation ranges and included the removal of any cycle
slips. 7. Using TerraScan and Microstation, ground classifications utilized custom
settings appropriate to the study area. 8. The corrected and filtered return points
were compared to the RTK ground survey points collected to verify the vertical and
horizontal accuracies. 9. Points were output as laser points, TINed and GRIDed surfaces.
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2008-07-17T00:00:00 |
The NOAA Coastal Services Center (CSC) received the files in las format.
The files contained Lidar elevation and intensity measurements. The data was in Lambert
Conformal Conic and Oregon State Plane projections, and NAVD88 Geoid 03 vertical datum.
CSC performed the following processing to the data to make it available within the
LDART Retrieval Tool (LDART): 1. The data were converted from Lambert Conformal Conic
and Oregon State Plane coordinates to geographic coordinates. 2. The data were converted
from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03. 3.
The LAS data were sorted by latitude and the headers were updated.
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2011-09-19T00:00:00 |
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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