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Short Citation:
OCM Partners, 2022: May 2002 Lidar Point Data of Southern California Coastline: Dana Point to Point La Jolla, https://www.fisheries.noaa.gov/inport/item/50001.

Item Identification

Title: May 2002 Lidar Point Data of Southern California Coastline: Dana Point to Point La Jolla
Short Name: scripps_20020522_m45_metadata
Status: Completed
Publication Date: 2003-04-17
Abstract:

This data set contains lidar point data from a strip of Southern California coastline

(including water, beach, cliffs, and top of cliffs) from Dana Point to Point La Jolla. 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 is installed in

a single engine Cessna 206 (tail number N4589U) owned and operated by the Texas State Aircraft Pooling Board.

The lidar data set described by this document was collected at low tide on 22 May 2002 (14202) between 18:20 and 21:39 UTC

(actual data collection). Conditions on that day were light clouds along the shoreline as well as offshore. 99d118 instrument

settings for this flight were; laser pulse rate: 25kHz, scanner rate: 26Hz (28Hz for calibration target), scan angle:

+/-20deg, beam divergence: narrow, altitude: 680-780m AGL for first half of flight and 900-950 for second half of flight,

and ground speed: 83-125kts. Two GPS base stations (Scripps pier and San Onofre Power Plant) were operating during the survey.

The survey included 3 shoreline passes between Dana Point and Point La Jolla as well as one offshore pass along the 20m

isobath. 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

Purpose:

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.

Notes:

10645

Other Citation Details:

quad names: Dana Point, San Clemente, San Onofre Bluff, Las Pulgas Canyon, Oceanside, San Luis Rey, Encinitas, Del Mar,

La Jolla

Supplemental Information:

The ALTM 1225 has the following specifications: operating altitude = 410-2,000 m AGL; 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 = 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.

Keywords

Theme Keywords

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

Temporal Keywords

Thesaurus Keyword
UNCONTROLLED
None 2002
None May

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: 686382
Date Effective From: 2003-04-17
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: 686384
Date Effective From: 2003-04-17
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: 686385
Date Effective From: 2003-04-17
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: 686383
Date Effective From: 2003-04-17
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: 1136008
W° Bound: -117.704143
E° Bound: -117.249643
N° Bound: 33.471978
S° Bound: 32.838178

Extent Group 1 / Time Frame 1

CC ID: 1136007
Time Frame Type: Discrete
Start: 2002-05-22

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

;

Data Access Constraints:

none

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: 742542
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=45
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: 742543
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/45/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 742545
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 742546
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 686406
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 686405
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: 718602
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 742544
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

Selected portions from each lidar data set (last return only) were used to generate

a 1m x 1m digital elevation model (DEM). Data estimated to have a horizontal accuracy of 0.01-0.03m from ground surveys

using kinematic GPS techniques were superimposed on the lidar DEM and examined for any mismatch between the horizontal

position of the ground GPS and the corresponding feature on the lidar DEM. Horizontal agreement between the ground kinematic

GPS and the lidar was within the resolution of the 1m x 1m DEM.

Vertical Positional Accuracy:

Ground GPS surveys were conducted within the lidar survey area to acquire ground

"truth" information. The ground survey points are estimated to have a vertical accuracy of 0.01-to-0.03m. The parking lot

at Torrey Pines State Park and the Scripps Pier were surveyed using kinematic GPS techniques. A lidar data set was sorted

to find data points that fell within 0.5m of a ground GPS survey point. The mean elevation difference between the lidar

and the ground GPS was used to estimate and remove an elevation bias from the lidar. The standard deviation of these

elevation differences provides estimates of the lidar precision. The May 2002 lidar data set was determined to have an

elevation bias of 0.19m when compared to ground truth. The 0.19m bias was removed so that mean lidar elevations conform

to NAVD88 with an RMSE of 0.10m.

Completeness Report:

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

Conceptual Consistency:

Not Applicable

Lineage

Sources

Air and Ground GPS files from 14202

CC ID: 1136001
Publish Date: 2002-05-22
Extent Type: Discrete
Extent Start Date/Time: 2002-05-22
Source Contribution:

air and ground GPS files

base station coordinates (Easting, Northing, HAE) in NAD83:

Scripps Pier (PIER) = 476093.032, 3636524.941, -25.424

San Onofre (GPS1) = 447430.150, 3693036.731, -5.166

| Type of Source Media: digital file

Raw lidar data output from ALTM 1225

CC ID: 1136002
Publish Date: 2002-05-22
Extent Type: Discrete
Extent Start Date/Time: 2002-05-22
Source Contribution:

raw lidar data from ALTM 1225 (all times are UTC)

20m isobath = 18:27-18:51

Pass 1 (Dana Point to Point La Jolla) = 19:14-19:41

Pass 2 (Point La Jolla to Dana Point) = 19:48-20:20

Pass 3 (Dana Point to Point Mateo) = 20:23-20:30

Pass 4 (Dana Point to Point Mateo) = 20:54-20:58

Pass 5 (Point Mateo to Dana Point) = 21:02-21:07

Pass 6 (Dana Point to Point La Jolla) = 21:11-21:39

6 calibration passes between 19:00-19:04 and 20:33-20:45

| Type of Source Media: digital file

Process Steps

Process Step 1

CC ID: 1136003
Description:

Transfer raw ALTM 1225 flight data, airborne GPS data collected at 1 Hz using Ashtech receiver, and ground-based GPS data

collected at 1 Hz using Ashtech and Trimble 4000SSI receivers to NT workstation. 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 software. Computed aircraft trajectories

for both base stations using National Geodetic Survey's KINPOS software. Coordinates for base stations and trajectories

are in the International Terrestrial Reference Frame of 2000 (ITRF2000) datum. Trajectories from both base stations were

merged into one. Weighting for trajectory merge is based upon baseline length (distance from base station) and solution RMS.

Transformed trajectory solution from ITRF2000 to North American Datum of 1983 (NAD83). Use NAD83 trajectories and aircraft

inertial measurement unit data in Applanix's POSProc version 2.1.4 to compute an optimal 50Hz inertial navigation solution.

Substitute the aircraft position and attitude information from the inertial navigation solution into Realm 2.27. Extract

calibration area data set from lidar point file for quality control and instrument calibration checks. If necessary, use

multiple iterations to adjust calibration parameters (pitch, roll, and scale) and reprocess sample data set. Then generate

entire lidar point file (9-column ASCII file). Use the Geiod99 geoid model to convert from Height Above the GRS80 ellipsoid

to elevations with respect to the North American Vertical Datum 88 (NAVD88). Transfer point file from NT workstation to

UNIX workstation. Parse the 9-column lidar point file into 3.75-minute quarter-quadrangle components and apply elevation

bias correction (determined during calibration step). There are some points in the file that only contain 5-columns.

These are points that either the first or last pulse was not recorded. UTM Easting and Northing were converted 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). Latitude and longitude are in decimal degrees with nine

significant digits to retain the 0.01m resolution of the UTM coordinates. 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). West longitude is negative and north latitude

is positive. The eighteen UTM quarter-quad files were re-organized into ten 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. may02) and the lower latitude bounding the quarter-quad. The quarter-quad file name and the

corresponding lat-long file name are shown below. Processing occurred from 20020522-20030416.

d_point_nw.asc,d_point_ne.asc = may02_33.4375.asc

d_point_se.asc, s_clem_sw.asc = may02_33.3750.asc

s_ono_nw.asc, s_ono_ne.asc, l_pul_nw.asc = may02_33.3125.asc

l_pul_sw.asc, l_pul_se.asc = may02_33.2500.asc

oside_ne.asc = may02_33.1875.asc

oside_se.asc, s_luis_sw.asc = may02_33.1250.asc

encin_nw.asc, encin_ne.asc = may02_33.0625.asc

encin_se.asc = may02_33.0000.asc

d_mar_oew_ne.asc = may02_32.9375.asc

d_mar_oew_se.asc = may02_32.8750.asc

l_jol_oew_ne.asc = may02_32.8125.asc

Process Date/Time: 2002-05-22 00:00:00

Process Step 2

CC ID: 1136004
Description:

Created initial metadata

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

Process Step 3

CC ID: 1136005
Description:

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: 50001
GUID: gov.noaa.nmfs.inport:50001
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