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Short Citation:
OCM Partners, 2022: 2002 NASA/USGS Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for California, Oregon, and Washington Coastlines, https://www.fisheries.noaa.gov/inport/item/49634.

Item Identification

Title: 2002 NASA/USGS Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for California, Oregon, and Washington Coastlines
Short Name: atm3_m14_metadata
Status: Completed
Abstract:

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

Purpose:

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.

Notes:

10278

Supplemental Information:

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.

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None beach
None erosion

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
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 Office for Coastal Management or its partners.

Data Set Credit: 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.

Support Roles

Data Steward

CC ID: 670690
Date Effective From: 2016-05-23
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 670692
Date Effective From: 2016-05-23
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 670693
Date Effective From: 2016-05-23
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 670691
Date Effective From: 2016-05-23
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1133107
W° Bound: -128.111
E° Bound: -119.611
N° Bound: 48.389465
S° Bound: 36.933602

Extent Group 1 / Time Frame 1

CC ID: 1133106
Time Frame Type: Range
Start: 2002-09-18
End: 2002-10-03

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

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.

;

Data Access Constraints:

None

Data Use Constraints:

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.

Distribution Information

Distribution 1

CC ID: 740454
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=14
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 740455
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/14/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 740457
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 740458
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 670710
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 670709
Activity Date/Time: 2017-11-14
Description:

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.

Activity Log 3

CC ID: 718175
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 740456
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

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.

Horizontal Positional Accuracy:

The ATM LIDAR elevation points are estimated to be horizontally accurate to +/- 0.8 meters at an aircraft altitude of 700 meters.

Vertical Positional Accuracy:

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.

Completeness Report:

None

Conceptual Consistency:

Not applicable.

Lineage

Process Steps

Process Step 1

CC ID: 1133103
Description:

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.

Process Date/Time: 2004-08-01 00:00:00

Process Step 2

CC ID: 1133104
Description:

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.

Catalog Details

Catalog Item ID: 49634
GUID: gov.noaa.nmfs.inport:49634
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:21+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16