48157
1998 Winter East Coast NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline
atm1998_winter_east_coast_m38_metadata
Data Set
Published / External
37231
Lidar
Project
Completed
2000-01-01
This data set includes data collected in February 1998 and partially covers coastline of the Delmarva peninsula in
the states of Virgina, Maryland, and Delaware.
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.
Original contact information:
Contact Org: NOAA Office for Coastal Management
Phone: 843-740-1202
Email: coastal.info@noaa.gov
This data was collected as part of an effort to map beach topography and assess beach change along the US coastline.
10180
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.
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > TOPOGRAPHICAL RELIEF MAPS
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > SEAFLOOR TOPOGRAPHY
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
Theme
ISO 19115 Topic Category
elevation
Spatial
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > DELAWARE
Spatial
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MARYLAND
Spatial
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > VIRGINIA
Theme
beach
Theme
erosion
Office for Coastal Management
Charleston
SC
Data Set
None Planned
This data was collected for the purposes of research. Any conclusions drawn from analysis of this information are not the responsibility
of NOAA, the Office for Coastal Management, or its partners.
Airborne Topographic Mapper LIDAR data were collected in partnership with the National Oceanic and Atmospheric Administration (NOAA)
Office for Coastal Management, the NASA Wallops Flight Facility, the U. S. Geological Survey (USGS) Center for Coastal and Regional
Marine Geology, and the NOAA Aircraft Operations Center.
Data Steward
2000-01-01
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2000-01-01
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2000-01-01
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2000-01-01
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Ground Condition
-124.621351
-69.692954
47.88563
25.633621
Range
1998-02-09
1998-02-10
Yes
Unclassified
This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer. The data set is dynamically generated based on
user-specified parameters.
;
None
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 Office for Coastal Management. 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 its limitations.
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=38
Customized Download
Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/38/index.html
Bulk Download
Simple download of data files.
https://coast.noaa.gov
Online Resource
https://coast.noaa.gov/dataviewer
Online Resource
2016-05-23
Date that the source FGDC record was last modified.
2017-11-14
Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.
2018-02-08
Partial upload of Positional Accuracy fields only.
2018-03-13
Partial upload to move data access links to Distribution Info.
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.
The ATM LIDAR elevation points are known to be horizontally accurate to +/- 0.8 meters at an aircraft altitude of 700 meters.
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.
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'.
Not applicable
1
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.
gov.noaa.nmfs.inport:48157
Anne Ball
2017-11-14T14:19:44
SysAdmin InPortAdmin
2022-08-09T17:11:33
2022-03-16
Office for Coastal Management
OCM
1002
Public
No
2022-03-16
1 Year
2023-03-16