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Metadata Identifier: gov.noaa.csc.maps:2000_HI_USACE_Bathy_m1458
MD_DataIdentification
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2000 USACE Bathymetric LiDAR: Hawaiian Islands |
These data were collected by the SHOALS (Scanning Hydrographic Operational
Airborne Lidar Survey) system which consists of an airborne laser transmitter/receiver
capable of measuring 400 soundings per second. The system operates from a deHavilland
DHC-6 Twin Otter flying at altitudes between 200 and 400 meters with a ground speed
of about 100 knots. The SHOALS system also includes a ground-based data processing
system for calculating acurate horizontal position and water depth. Lidar is an acronym
for LIght Detection And Ranging. The system operates by emitting a pulse of light
that travels from an airborne platform to the water surface where a small portion
of the laser energy is backscattered to the airborne receiver. The remaining energy
at the water's surface propogates through the water column and reflects off the sea
bottom and back to the airborne detector. The time difference between the surface
return and the bottom return corresponds to water depth. The maximum depth the system
is able to sense is related to the complex interaction of radiance of bottom material,
incident sun angle and intensity, and the type and quantity of organics or sediments
in the water column. As a rule-of-thumb, the SHOALS system should be capable of sensing
bottom to depths equal to two or three times the Secchi depth.
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SV_Identification
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2000 USACE Bathymetric LiDAR: Hawaiian Islands |
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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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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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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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JALBTCX (originator) |
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US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center
of eXpertise (JALBTCX)
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Data Production Manager |
JALBTCX@usace.army.mil |
originator |
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| 1 |
JALBTCX (pointOfContact) |
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US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center
of eXpertise (JALBTCX)
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Data Production Manager |
JALBTCX@usace.army.mil |
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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-158.275000 |
-154.803683 |
21.718898 |
18.900120 |
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| 1 |
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-158.275000 |
-154.803683 |
21.718898 |
18.900120 |
| 1 |
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 |
| 1 |
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2000-12-01T00:00:00 |
The SHOALS airborne system acquires a tremendous volume of raw data
during a single mission. The lidar data are unique and require a specialized Data
Processing System (DPS) for post-processing. The DPS main funcions 1) import airborne
data stored on high density data tape; 2) perform quality control checks on initial
depths and horizontal positions; 3) provide display and edit capabilities; 4) calculate
depth and position (XYZ) values for each sounding; and 5) output final positions and
depths for each sounding.
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| 1 |
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2012-01-01T00:00:00 |
The NOAA Coastal Services Center (CSC) received topographic files
in ASCII format. The files contained bathymetric depth measurements. Some sections
of the data were received in NAD27 Hawaii State Plane (various zones), other sections
were received in NAD27 UTM Zones 4 and 5. The data were vertically referenced to MLLW
(feet or meters). CSC performed the following processing for data storage and Digital
Coast provisioning purposes: 1. The topographic las files were converted from Projected
coordinates (State Plane or UTM) to Geographic coordinates. 2. If the vertical units
were feet they were converted to meters. 3. The data were converted from ASCII to
LAS V1.2 4. All points were classified to Class 11 (Bathymetry). 5. The data were
converted to LAZ format.
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| 1 |
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2013-03-28T00:00:00 |
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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