(NMMR Metadata gov.noaa.csc.maps:alace_1998_ma)
1996-2000 NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline
1996-2000 NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline
Metadata from the NOAA Metadata Manager and Repository (NMMR)
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Publication Date:
Unknown
Title:
1996-2000 NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline
Publication Information:
Publication Place:
Charleston, SC
Publisher:
NOAA's Ocean Service, Coastal Services Center (CSC)
Description:
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.
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date:
19961009
Ending Date:
20001102
Currentness Reference:
Ground condition
Status:
Progress:
Complete
Maintenance and Update Frequency:
None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate:
-124.621351
East Bounding Coordinate:
-69.692954
North Bounding Coordinate:
47.885630
South Bounding Coordinate:
25.633621
Keywords:
Theme:
Theme Keyword Thesaurus:
ISO 19115 Topic Category
Theme Keyword:
Elevation
Theme:
Theme Keyword Thesaurus:
None
Theme Keyword:
lidar
Theme Keyword:
laser
Theme Keyword:
beach
Theme Keyword:
Bathymetry/Topography
Theme Keyword:
digital elevation model
Theme Keyword:
DEM
Theme Keyword:
erosion
Place:
Place Keyword Thesaurus:
None
Place Keyword:
U.S. Coastline
Place Keyword:
Alabama
Place Keyword:
Delaware
Place Keyword:
Maryland
Place Keyword:
North Carolina
Place Keyword:
South Carolina
Place Keyword:
Virginia
Place Keyword:
Connecticut
Place Keyword:
Massachussetts
Place Keyword:
Maine
Place Keyword:
New Hampshire
Place Keyword:
New Jersey
Place Keyword:
New York
Place Keyword:
Rhode Island
Place Keyword:
Florida
Place Keyword:
Louisiana
Place Keyword:
Mississippi
Place Keyword:
Georgia
Place Keyword:
California
Place Keyword:
Oregon
Place Keyword:
Washington
Place Keyword:
Texas
Place Keyword:
Ohio
Place Keyword:
Pennsylvania
Access Constraints:
None
Use Constraints:
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.
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS),
Coastal Services Center (CSC)
Contact Position:
TCM Project Scientist
Contact Address:
Address Type:
mailing and physical address
Address:
2234 South Hobson Avenue
City:
Charleston
State or Province:
South Carolina
Postal Code:
29405
Country:
United States
Contact Voice Telephone:
(843) 740-1200
Contact Electronic Mail Address:
tcm@csc.noaa.gov
Data Set Credit:
Airborne Topographic Mapper LIDAR data were collected in partnership
with the National Oceanic and Atmospheric Administration (NOAA) Coastal
Services Center, the NASA Wallops Flight Facility, the U. S. Geological
Survey (USGS) Center for Coastal and Regional Marine Geology, and the
NOAA Aircraft Operations Center.
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'.
Positional Accuracy:
Horizontal Positional Accuracy:
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:
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.
Process Date:
Unknown
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:
20071226
Process Contact:
Contact Information:
Contact Organization Primary:
Contact Organization:
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS),
Coastal Services Center (CSC)
Contact Person:
Keil Schmid
Contact Position:
TCM Project Scientist
Contact Address:
Address Type:
mailing and physical address
Address:
2234 South Hobson Avenue
City:
Charleston
State or Province:
SC
Postal Code:
29405-2413
Contact Voice Telephone:
843-740-1200
Contact Electronic Mail Address:
tcm@csc.noaa.gov
Resource Description:
Downloadable Data
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.
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.
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization:
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Contact Person:
Kelly Stroker
Contact Address:
Address Type:
Mailing and Physical Address
Address:
NOAA/NESDIS/NGDC E/GC1 325 Broadway
City:
Boulder
State or Province:
CO
Postal Code:
80305-3328
Country:
USA
Contact Voice Telephone:
(303) 497-4603
Contact TDD/TTY Telephone:
(303) 497-6958
Contact Facsimile Telephone:
(303) 497-6513
Contact Electronic Mail Address:
kelly.stroker@noaa.gov
Hours of Service:
7:30-5:00 Mountain
Contact Instructions:
Contact Data Center
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:
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.
