49634
2002 NASA/USGS Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for California, Oregon, and Washington Coastlines
atm3_m14_metadata
Data Set
Published / External
49401
Lidar - partner (no harvest)
Project
Completed
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 by the USGS and NASA to map beach topography and assess beach change for the states of California,
Oregon and Washington.
10278
This data set was collected with the NASA Airborne Topographic Lidar 3 (ATM3) LIDAR (LIght Detection and Ranging) instrument which was designed
and developed by the NASA Observational Science Branch (OSB Code 972) Goddard Space Flight Center, Wallops Island VA. The ATM3 measures the time
of flight of a narrow pulse (5 nanoseconds) of green laser light (532 nm) from the aircraft to the ground and back to the aircraft. The laser is
pulsed at 5000 Hz and the pulses are reflected from a 22 degree off-nadir scanning mirror rotating at 20 Hz which directs the laser light and the
telescope view in an elliptical scan pattern under the aircraft. The telescope collects the reflected laser light which passes through a narrow
bandpass filter (to reject background light) and is detected by a photomultiplier tube detector. The ATM3 time of flight measurements are
calibrated and combined with GPS data (to provide position) and aircraft inertial gyro data (to provide the aircraft attitude when each laser
measurement was recorded) resulting in a calculated latitude, longitude, and elevation for each laser spot in the 250 laser shot elliptical scan
under the aircraft. The scan pattern (at 22 degrees off nadir) covers a width of ~560 meters from a nominal aircraft altitude of 700 meters.
Depending on aircraft ground speed, several consecutive scans may overlap along the aircraft flight track. Normally parallel flight tracks will
be flown with ~20% overlap to cover areas wider than a single ATM3 scan width. The resultant data set is normally resampled and binned to create
a digital elevation model of the desired area. 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
ISO 19115 Topic Category
elevation
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.
This Airborne Topographic Mapper LIDAR data set was collected in partnership with the NASA Wallops Flight Facility, and the U. S. Geological
Survey (USGS) Center for Coastal and Regional Marine Geology.
Data Steward
2016-05-23
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
2016-05-23
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
2016-05-23
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
2016-05-23
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
-128.111
-119.611
48.389465
36.933602
Range
2002-09-18
2002-10-03
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 NASA,
USGS, or NOAA. 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=14
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/geoid18/14/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.
See Vertical_Positional_Accuracy_Report. 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 estimated to be horizontally accurate to +/- 0.8 meters at an aircraft altitude of 700 meters.
The accuracy of this data set has not been validated against ground truth measurements. An internal consistency check of the data was conducted.
The process compared elevation points determined to be over beaches and non-vegetated areas from overlapping flights. The elevation of points
within a meter of each other were compared. The average RSME of the 60 sample areas each containing on average 1311 common points was 18.5 cm.
In comparisons of another ATM LIDAR data set for a small geographic region to various ground surveys the differences are between +/- 15 to 20
centimeters. The accuracy of the majority of this data set is estimated to be consistent with the above stated results.
None
Not applicable.
1
The xyz coordinates of this data set were transformed from ITRF_2000 to ITRF_1994 using datum transformation parameters from the National
Geodetic Surveys HTDP software.
2004-08-01T00:00:00
2
The vertical values in this data set have been filtered through visual inspection to find abnormally high and abnormally low values. In addition,
these data have been filtered 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:49634
Anne Ball
2017-11-15T15:21:19
SysAdmin InPortAdmin
2022-08-09T17:11:37
2022-03-16
OCM Partners
OCMP
1002
Public
No
2022-03-16
1 Year
2023-03-16