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Short Citation:
OCM Partners, 2024: March 2006 Lidar Point Data of Southern California Coastline: Long Beach to US/Mexican Border,

Item Identification

Title: March 2006 Lidar Point Data of Southern California Coastline: Long Beach to US/Mexican Border
Short Name: scripps_20060324_m54_metadata
Status: Completed
Publication Date: 2006-07-26

This data set contains lidar point data (Geodetic Coordinates) from a strip of Southern California

coastline (including water, beach, cliffs, and top of cliffs) from Long Beach to the US/Mexico border. The data set was created

by combining data collected using an Optech Inc. Airborne Laser Terrain Mapper (ALTM) 1225 in combination with geodetic quality

Global Positioning System (GPS) airborne and ground-based receivers. The Bureau of Economic Geology, the University of Texas at

Austin owns and operates an ALTM 1225 system (serial number 99d118). The system was installed in a twin engine Partenavia P-68

(tail number N3832K) owned and operated by Aspen Helicopter, Inc. The lidar data set described by this document was collected on

24 and 25 March 2006; Julian Days 08306 and 08406 (see Lineage, Source_Information, Source_Contribution for pass information).

99d118 instrument settings for these flights were; laser pulse rate: 25kHz, scanner rate: 26Hz, scan angle: +/- 20deg, beam

divergence: narrow, altitude: 300-600m AGL, and ground speed: 95-120kts. Two GPS base stations were operating during each day

of the survey, Point Loma and San Onofre on 08306 and Seal Beach and San Onofre on 08406 (see Lineage, Source_Information,

and Source Contribution for coordinates). Data represented is all points including terrain, vegetation, and structures.

This data also contains returns from the water surface. No processing has been done to remove returns from terrain,

vegetation, structures or water surfaces.

Original contact information:

Contact Name: Julie Thomas/Randy Bucciarelli

Contact Org: SCBPS/CDIP, Scripps Institution of Oceanography

Title: Project Managers

Phone: 858-534-3032


The data described in this document will be compared with previous and forthcoming data sets to determine rates of

shoreline change along the Southern California coastline. The SCBPS program is designed to improve the understanding of beach

sand transport by waves and currents, thus improving local and regional coastal management.



Other Citation Details:

quad names (from north to south): Long Beach, Los Alamitos, Long Beach OE S, Seal Beach, Newport Beach, Newport Beach OE S,

Laguna Beach, San Juan Capistrano, Dana Point, San Clemente, San Onofre Bluff, Las Pulgas Canyon, Oceanside, San Luis Rey,

Encinitas, Del Mar OE W, Del Mar, La Jolla OE W, La Jolla, Point Loma OE W, Point Loma, Imperial Beach OE W, Imperial Beach

Supplemental Information:

The ALTM 1225 (SN#99d118) lidar instrument has the following specifications: operating altitude = 410-2,000 m AGL; maximum

laser pulse rate = 25 kHz; laser scan angle = variable from 0 to +/-20deg from nadir; scanning frequency = variable, 28 Hz

at the 20deg scan angle; and beam divergence: narrow = 0.2 milliradian (half angle, 1/e). The ALTM 1225 does not digitize and

record the waveform of the laser reflection, but records the range and backscatter intensity of the first and last laser

reflection using a constant-fraction discriminator and two Timing Interval Meters (TIM).

ALTM elevation points are computed using three sets of data: laser ranges and their associated scan angles, platform position

and orientation information, and calibration data and mounting parameters (Wehr and Lohr, 1999). Global Positioning System

(GPS) receivers in the aircraft and on the ground provide platform positioning. The GPS receivers record pseudo-range and

phase information for post-processing. Platform orientation information comes from an Inertial Measurement Unit (IMU)

containing three orthogonal accelerometers and gyroscopes. An aided-Inertial Navigation System (INS) solution for the

aircraft's attitude is estimated from the IMU output and the GPS information.

Wehr, A. and U. Lohr, 1999, Airborne laser scanning - an introduction and overview, ISPRS Journal of Photogrammetry and

Remote Sensing, vol. 54, no.2-3, pp.68-82.


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
None beach
None intensity
None Latitude
None Longitude
None point file
None shoreline

Temporal Keywords

Thesaurus Keyword
None 2006
None March

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Note:

None planned, as needed

Distribution Liability:

This data was collected in partnership with Scripps Institution of Oceanography,

The University of California, San Diego. Any conclusions drawn from analysis of this information are not the responsibility

of the Bureau of Economic Geology or the University of Texas at Austin, NOAA, the OCM or its partners.

Data Set Credit: SCBPS/CDIP is jointly funded by the US Army Corps of Engineers and the California Department of Boating and Waterways. The initial data are collected by Bureau of Economic Geology, The University of Texas at Austin: R. Gutierrez and T. Hepner. Center for Space Research, The University of Texas at Austin: A. Neuenschwander. Data are further classified and processed by the SCBPS group, located at the Scripps Institution of Oceanography.

Support Roles

Data Steward

CC ID: 686719
Date Effective From: 2006-07-26
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 686721
Date Effective From: 2006-07-26
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 686722
Date Effective From: 2006-07-26
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 686720
Date Effective From: 2006-07-26
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1138783
W° Bound: -118.203606
E° Bound: -117.116806
N° Bound: 33.768792
S° Bound: 32.510392

Extent Group 1 / Time Frame 1

CC ID: 1138782
Time Frame Type: Range
Start: 2006-03-24
End: 2006-03-25

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:


Data Access Constraints:


Data Use Constraints:

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: 742587
Download URL:
File Name: Customized Download

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

Distribution 2

CC ID: 742588
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 742590
URL Type:
Online Resource


CC ID: 742591
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 686743
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 686742
Activity Date/Time: 2017-11-14

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718611
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 742589
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

The lidar data is estimated to have a horizontal error of less than or equal to 0.50 m

from comparison between kinematic GPS road survey and a 1m resolution grey-scale image generated from the lidar backscatter

intensity data. Kinematic GPS data were superimposed on the lidar backscatter image and examined for any mismatch between

the horizontal position of the ground GPS and the corresponding features on the lidar image. Horizontal agreement between

the ground kinematic GPS and the lidar was within the resolution of the 1m -resolution backscatter image.

Vertical Positional Accuracy:

The March 2006 lidar data were compared to the 1998 ATM LIDAR data to determine offsets

in the vertical position. The ATM survey points are estimated to have a vertical accuracy of +/- 15 cm. The March 2006 lidar

data set was sorted to find data points that fell within 0.5 m of an ATM LIDAR survey point along piers in the survey area.

The mean elevation difference between the The elevation differences between the March 2006 survey and the ATM survey were

used to estimate and remove TIM1 and TIM2 elevation biases from each lidar flight. The standard deviation of these elevation

differences provides estimates of the lidar precision. After bias adjustment the mean lidar elevations have a vertical

accuracy of 0.10 m.

Completeness Report:

Data were edited by an automated method to remove obvious outliers above a threshold of 150m.

Conceptual Consistency:

Not Applicable



Air and Ground GPS files from 08306 and 08406

CC ID: 1138776
Publish Date: 2006-03-25
Extent Type: Range
Extent Start Date/Time: 2006-03-24
Extent End Date/Time: 2006-03-25
Source Contribution:

air and ground GPS files

base station coordinates Easting, Northing, HAE in NAD83, Zone 11 (Latitude, Longitude):

Seal Beach (SEAL) = 399190.210, 3733584.054, -27.287 (N 33 44 15.03814, W 118 05 17.77225)

San Onofre (SANO) = 447430.058, 3693036.854, -5.193 (N 33 22 31.08745, W 117 33 54.55130)

Point Loma (LOMA) = 477399.573, 3614791.280, 90.855 (N 32 40 13.99848, W 117 14 27.74927)

| Type of Source Media: digital file

Raw lidar data output from ALTM 1225, SN#99D118

CC ID: 1138777
Publish Date: 2006-03-25
Extent Type: Range
Extent Start Date/Time: 2006-03-24
Extent End Date/Time: 2006-03-25
Source Contribution:

raw lidar data from ALTM 1225 (all times UTC)


Pass A (Carlsbad to Mexico) = 18:41-19:14

Pass B (Mexico to Point Loma) = 19:17-19:24

Pass C (Point Loma to Mexico) = 19:29-19:35

Pass D (Point Loma to Dana Point) = 20:06-20:43

Pass E (Dana Point to La Jolla) = 20:49-21:16

Pass F (La Jolla to Dana Point) = 21:39-22:26

Pass G (Dana Point to Carlsbad) = 22:13-22:26

2 Calibration Passes = 21:19-21:25


Pass H (Newport Beach to Long Beach) = 20:44-20:56

Pass I (Long Beach to Dana Point) = 21:00-21:17

Pass J (Dana Point to Long Beach) = 21:31-21:47

Pass K (Long Beach to Dana Point) = 21:51-22:08

Pass L (Dana Point to Newport Beach) = 22:12-22:19

2 Calibration Passes = 22:24-22:30

| Type of Source Media: digital file

Process Steps

Process Step 1

CC ID: 1138778

GPS and XYZ-Point Data Processing

Transfer raw ALTM 1225 flight data (laser ranges with associated scan angle information and IMU data), airborne GPS data

collected at 1 Hz using Ashtech receiver, and ground-based GPS data collected at 1 Hz using Ashtech Z-12 receivers to

processing computer. Generate decimated lidar point file from above three data sets using Optech's Realm 2.27 software.

This is a 9-column ASCII data set with the following format: time tag; first pulse Easting, Northing, HAE; last pulse

Easting, Northing, HAE; first pulse intensity; and last pulse intensity. View decimated lidar point file to check data

coverage (i.e. sufficient overlap of flight lines and point spacing).

Compute base station coordinates using National Geodetic Survey's PAGES-NT software. Compute aircraft trajectories from

each base station GPS dataset using National Geodetic Survey's KINPOS software. Solutions for base stations coordinates

and aircraft trajectories are in the International Terrestrial Reference Frame of 2000 (ITRF2000). A final aircraft

trajectory was computed from a weighted average of the trajectories from the two base stations. Epoch-by-epoch weighting

for the individual trajectories was inversely proportional to the baseline length (distance from base station) and solution

RMS. Transformed trajectory solution from ITRF2000 to North American Datum of 1983 (NAD83) using the National Geodetic

Survey's Horizontal Time Dependent Positioning software ( Input NAD83

trajectories and aircraft inertial measurement unit data into Applanix's POSProc version 2.1.4 to compute an optimal

50Hz inertial navigation solution (INS) and smoothed best estimate of trajectory (SBET). Substitute the INS and SBET into

Realm 2.27. Generate a set of initial lidar instrument calibration parameters (pitch, roll, scale, and elevation bias)

for each lidar flight, then incrementally improve parameters by iteratively comparing a subset of the lidar output to

the GPS kinematic ground control. Once the instrument calibration parameters are sufficiently accurate, create the

complete lidar point file (9-column ASCII file) for the entire survey area in UTM Zone 11 with elevations being heights

above the GRS-80 reference ellipsoid (HAE).

The output format from REALM 2.27 was a 9-column ASCII file containing: the second in the GPS week, easting, northing

and HAE of the first lidar return, the easting, northing and HAE of the last lidar return, and the laser backscatter

intensity of the first and last returns.

Using the GEOID99 geoid model, heights above the GRS80 ellipsoid were converted to orthometric heights with respect

to the North American Vertical Datum of 1988 (NAVD88). Parse the 9-column lidar point file into 3.75-minute quarter-quadrangle

components. Convert UTM Easting and Northing to geodetic latitude and longitude with respect to the GRS80 ellipsoid.

The conversion was computed using the TMGEOD and TCONPC fortran subroutines written by T. Vincenty (NGS). Each record

contains 9 columns of data: time tag (seconds in the GPS week), first return Latitude,first return Longitude,

first return NAVD88, last return Latitude, last return Longitude, last return NAVD88, first return intensity, and last

return intensity. In some cases either the first or last return values may be missing (5 columns). Latitude

and longitude are in decimal degrees with nine significant digits to retain the 0.01m resolution of the UTM coordinates.

West longitude is negative and north latitude is positive. The UTM quarter-quad files were re-organized into latitude

delineated files. UTM quarter-quads files that were delineated by the same upper and lower latitude bounds were concatenated.

The lat-long files were named by the month-year of the survey (e.g. mar06) and the lower latitude bounding the quarter-quad.

Processing occurred 20060324-20060726.

Process Date/Time: 2006-03-24 00:00:00

Process Step 2

CC ID: 1138779

Created initial metadata

Process Date/Time: 2003-04-18 00:00:00

Process Step 3

CC ID: 1138780

The NOAA Office for Coastal Management (OCM) received files in ASCII format. The files contained LiDAR intensity

and elevation measurements. OCM performed the following

processing on the data to make it available within the LiDAR Data Retrieval Tool (LDART)

1. Data returned to ellipsoid heights from NAVD88, using GEOID99.

2. Data converted to LAS format.

3. The LAS data were sorted by latitude and the headers were updated.

Process Date/Time: 2007-07-24 00:00:00

Catalog Details

Catalog Item ID: 50010
GUID: gov.noaa.nmfs.inport:50010
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:23+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