gov.noaa.csc.maps:alace_1998_ma
1996-2000 NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
1996-2000 NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline
Unknown
Charleston, SC
NOAA's Ocean Service, Coastal Services Center (CSC)
http://www.csc.noaa.gov/ldart
ABSTRACT: This data set includes data collected from 1996-2000 and covers the states of AL,FL,LA,MS,DE,MD,VA,CT,MA,ME,NH, NJ,NY,RI,NC,SC,GA,CA OR,WA,TX OH,PA. Laser beach mapping uses a pulsed laser ranging system mounted onboard an aircraft to measure ground elevation and coastal topography. The laser emits laser beams at high frequency and is directed downward at the earth's surface through a port opening in the bottom of the aircraft's fuselage. The laser system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the aircraft. The aircraft travels over the beach at approximately 60 meters per second while surveying from the low water line to the landward base of the sand dunes.
PURPOSE: This data was collected as part of an effort to map beach topography efficiently and cheaply.
SUPPLEMENTAL INFORMATION:
This data set was collected with a LIDAR
(LIght Detection And Ranging) instrument designed and
developed by the Observational Sciences Branch (OSB) of
NASA at the Wallops Flight Facility in Virginia. The
instrument, originally designed for mapping ice sheets
in Greenland, is called the Airborne Topographic Mapper
or ATM. The ATM II (the latest version), operates with
a Spectra Physics laser transmitter, which provides a
7 nanoseconds long, 250 microjoules pulse at a
frequency-doubled wavelength of 523 nanometers in the
blue-green spectral region. The laser transmitter
can function at pulse rates from 2 to 10 kilohertz
(kHz). The laser system with a separate cooling unit
weighs approximately 45 kilograms (kg) and requires
approximately 15 amperes of power at 115 volts.
The transmitted laser pulse is reflected to the surface
of the earth with the aid of a small folding mirror mounted
on the back of a secondary mirror of a rotating scan
mirror assembly mounted directly in front of the
telescope. The scan mirror, which is rotated at 20
hertz, is comprised of a section of round aluminum
stock, machined to a specific off-nadir angle.
A scan mirror with the off-nadir angle of 15 degrees
was utilized, producing an elliptical scan pattern
with a swath width equal to 50 percent of the
approximately 700-meter aircraft altitude. The reflected
laser pulse is transmitted to a photo-multiplier
assembly that consists of a lens, a narrow bandpass
filter, and a single photomultiplier tube.
Note: The Spatial Reference section of this document
may lack fully FGDC-compliant information regarding
projection parameters (i.e., Central meridian, false
Northing, etc.). The State Plane or UTM Zone will be
supplied, and the corresponding parameters can be found
in Appendix C of:
Snyder, John, 1987, Map Projections, a Working Manual
(U.S. Geological Survey Professional Paper 1395):
Washington, U.S. Government Printing Office.
CURRENTNESS REFERENCE: Ground condition
SPATIAL DATA ORGANIZATION INFORMATION
Direct Spatial Reference:
Point
SDTS Point and Vector Object Type:
Point
1996-10-09
2000-11-02
COMPLETE
25.633621
47.885630
-124.621351
-69.692954
ELEVATION
lidar
laser
beach
Bathymetry/Topography
DIGITAL ELEVATION MODEL
DEM
erosion
U.S. Coastline
Alabama
Delaware
Maryland
North Carolina
South Carolina
Virginia
Connecticut
Massachussetts
Maine
New Hampshire
New Jersey
New York
Rhode Island
Florida
Louisiana
Mississippi
Georgia
California
Oregon
Washington
Texas
Ohio
Pennsylvania
ACCESS CONSTRAINTS:
None
DISTRIBUTION LIABILITY:
This data was collected for the purposes of research.
Any conclusions drawn from analysis of this information
are not the responsibility of NOAA, the Coastal Services
Center, or it's partners.
DISTRIBUTION LIABILITY:
Disclaimer While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
CUSTOM ORDER PROCESS:
This data can be obtained on-line at the following URL:
http://www.csc.noaa.gov/ldart. The data set is dynamically generated based on
user-specified parameters.
CUSTOM ORDER PROCESS:
The National Geophysical Data Center serves as the archive for this LIDAR data. NGDC should only be contacted for this data if it cannot be obtained from NOAA Coastal Services Center.
This data was collected for the purposes of research. Any conclusions drawn from analysis of this information
are not the responsibility of NOAA or the Coastal Services Center. This data is likely to contain returns
from the water surface and vegetation. No processing has been done to remove returns from water or vegetation.
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 it's limitations.
TECHNICAL CONTACT
DEPARTMENT OF COMMERCE (DOC), NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION (NOAA), NATIONAL OCEAN SERVICE (NOS),
COASTAL SERVICES CENTER (CSC)
2234 South Hobson Avenue
Charleston
South Carolina
29405
United States
DIF AUTHOR
KEIL SCHMID
NOAA COASTAL SERVICES CENTER
2234 South Hobson Avenue
Charleston
SC
29405-2413
2008-02-06
2007-06-26
DOC/NOAA/NOS/CSC
Coastal Services Center, National Ocean Service, NOAA, U.S. Department of Commerce
http://www.csc.noaa.gov
______Downloadable_Data
____
DATA CENTER CONTACT
KEIL SCHMID
KELLY STROKER
DEPARTMENT OF COMMERCE (DOC), NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION (NOAA), NATIONAL OCEAN SERVICE (NOS),
COASTAL SERVICES CENTER (CSC)
DOC/NOAA/NESDIS/NGDC > NATIONAL GEOPHYSICAL DATA CENTER, NESDIS, NOAA, U.S. DEPARTMENT OF COMMERCE
2234 South Hobson Avenue
Charleston
SC
29405-2413
NOAA/NESDIS/NGDC E/GC1 325 Broadway
Boulder
CO
80305-3328
USA
DOC/NOAA/NESDIS/NGDC
National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
http://www.csc.noaa.gov
______Downloadable_Data
____
DATA CENTER CONTACT
KEIL SCHMID
KELLY STROKER
DEPARTMENT OF COMMERCE (DOC), NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION (NOAA), NATIONAL OCEAN SERVICE (NOS),
COASTAL SERVICES CENTER (CSC)
DOC/NOAA/NESDIS/NGDC > NATIONAL GEOPHYSICAL DATA CENTER, NESDIS, NOAA, U.S. DEPARTMENT OF COMMERCE
2234 South Hobson Avenue
Charleston
SC
29405-2413
NOAA/NESDIS/NGDC E/GC1 325 Broadway
Boulder
CO
80305-3328
USA
ATTRIBUTE ACCURACY REPORT:
Raw elevation measurements have been determined to be vertically accurate
to within 15 cm. Processing steps (datum conversion, projection, grid
interpolation, etc.) introduce additional error factors which have not
been tested at the time of this publication.
LOGICAL CONSISTENCY REPORT:
Not applicable.
COMPLETENESS REPORT:
All elevation data points that appeared to be within a reasonable vertical
range were retained, and other points were thrown away. This filtering process
was performed 'by eye'.
HORIZONTAL POSITIONAL ACCURACY REPORT:
The ATM LIDAR elevation points are known to be horizontally accurate
to +/- 0.8 meters at an aircraft altitude of 700 meters.
VERTICAL POSITIONAL ACCURACY REPORT:
The ATM LIDAR elevation measurements have been found to be within +/-
15 centimeters of each other in successive and overlapping passes of
the same area. In comparisons of LIDAR data for a small geographic region
with various ground surveys the differences are between +/- 15 to
20 centimeters. The accuracy of the majority of the data is estimated
to be consistent with the above stated results. At this time, there has been
no large scale verification of the data.
LINEAGE/PROCESS STEP:
PROCESS DESCRIPTION:
The vertical values in this data set have been
filtered through visual inspection to find abnormally high
and abnormally low values. In addition, this data
was processed using a spatial filtering program that identifies
and discards outlier elevation measurements. This program reads
each elevation measurement within a file and identifies "spatially close"
points (i.e. those neighboring points within a fixed radius of the point).
The mean and standard deviation is calculated using the elevations of these
points. If the elevation difference from the mean of the point under consideration
is more than 2 standard deviations and greater than a defined distance
the point is discarded.
LINEAGE/PROCESS STEP:
PROCESS DESCRIPTION:
The NOAA National Geophysical Data Center (NGDC) received Lidar data files on external harddrive. The disk contains LiDAR data from the NOAA Coastal Services Center. This data is currently being served via LDART at http://www.csc.noaa.gov/ldart . This data can be used to re-populate the system.
PROCESS DATE:
Unknown
PROCESS DATE:
20071226
VIEW EXTENDED METADATA
http://www.ngdc.noaa.gov/nmmr/xmls/xml-to-text.jsp?id=
gov.noaa.csc.maps:alace_1998_ma
View Source Metadata document from the Metadata Manager and Repository (NMMR).
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