gov.noaa.nmfs.inport:50002
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dataset
OCM Partners
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NOAA Office for Coastal Management
(843) 740-1202
2234 South Hobson Ave
Charleston
SC
29405-2413
coastal.info@noaa.gov
https://coast.noaa.gov
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NOAA Office for Coastal Management Website
NOAA Office for Coastal Management Home Page
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2024-02-29T00:00:00
ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data
ISO 19115-2:2009(E)
point
85441633
September 2002 Lidar Point Data of Southern California Coastline: Dana Point to Point La Jolla
scripps_20020909_m46_metadata
2003-04-22
publication
NOAA/NMFS/EDM
50002
https://www.fisheries.noaa.gov/inport/item/50002
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View the complete metadata record on InPort for more information about this dataset.
information
https://coast.noaa.gov
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Online Resource
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quad names: Del Mar, Dana Point, Encinitas, La Jolla, Las Pulgas Canyon, Oceanside, San Clemente, San Luis Rey, San Onofre
Bluff
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 geographic extent of the data set is equivalent to the
18 quarter-quadrangles listed in Other_Citation_Details plus 30 meters of overedge beyond the extents of each quarter-quadrangle
(overlap between quads). 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 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 on 9 September 2002 (25202) between 22:44 and 02:02 UTC (see Lineage,
Source_Information, Source_Contribution for pass information). Conditions on that day were clear skies, no fog or low clouds,
but haze. 99d118 instrument settings for this flight were; laser pulse rate: 25kHz, scanner rate: 26Hz, scan angle: +/-20deg,
beam divergence: narrow, altitude: 760-960m AGL, and ground speed: 99-110kts. Two GPS base stations (Scripps pier and San Onofre
Power Plant, see Lineage, Source_Information, Source_Contribution for coordinates) were operating during the survey. 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.
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.
completed
NOAA Office for Coastal Management
(843) 740-1202
2234 South Hobson Ave
Charleston
SC
29405-2413
coastal.info@noaa.gov
https://coast.noaa.gov
WWW:LINK-1.0-http--link
NOAA Office for Coastal Management Website
NOAA Office for Coastal Management Home Page
information
pointOfContact
NOAA Office for Coastal Management
(843) 740-1202
2234 South Hobson Ave
Charleston
SC
29405-2413
coastal.info@noaa.gov
https://coast.noaa.gov
WWW:LINK-1.0-http--link
NOAA Office for Coastal Management Website
NOAA Office for Coastal Management Home Page
information
custodian
None planned, as needed
Latitude
Longitude
beach
intensity
point file
shoreline
theme
2002
September
temporal
Lidar - partner (no harvest)
project
InPort
otherRestrictions
Cite As: OCM Partners, [Date of Access]: September 2002 Lidar Point Data of Southern California Coastline: Dana Point to Point La Jolla [Data Date Range], https://www.fisheries.noaa.gov/inport/item/50002.
NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
otherRestrictions
Access Constraints: none
otherRestrictions
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.
otherRestrictions
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.
unclassified
NOAA Data Management Plan (DMP)
NOAA/NMFS/EDM
50002
https://www.fisheries.noaa.gov/inportserve/waf/noaa/nos/ocmp/dmp/pdf/50002.pdf
WWW:LINK-1.0-http--link
NOAA Data Management Plan (DMP)
NOAA Data Management Plan for this record on InPort.
information
crossReference
vector
eng; US
elevation
-117.743455
-117.249755
32.843078
33.490578
| Currentness: Ground Condition
2002-09-09
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.
NOAA Office for Coastal Management
(843) 740-1202
2234 South Hobson Ave
Charleston
SC
29405-2413
coastal.info@noaa.gov
https://coast.noaa.gov
WWW:LINK-1.0-http--link
NOAA Office for Coastal Management Website
NOAA Office for Coastal Management Home Page
information
distributor
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=46
WWW:LINK-1.0-http--link
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Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
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dataset
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 September 2002 lidar data set was determined to have an elevation bias of -0.007m when
compared to ground truth. The -0.007m bias was removed so that mean lidar elevations conform to NAVD88 with an RMSE of 0.125m.
Completeness Report
Data were edited by an automated method to remove obvious outliers above a threshold of 150m.
Conceptual Consistency
Not Applicable
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). 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 eighteen UTM quarter-quad files were re-organized into eleven 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. Processing occurred 20020909-20030421.
2002-09-09T00:00:00
Created initial metadata
2003-04-18T00:00:00
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.
2007-07-24T00:00:00
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
Air and Ground GPS files from 25202
2002-09-09
publication
2002-09-09
Source Contribution: raw lidar data from ALTM 1225
Offshore Pass = 22:54-23:19 UTC
Pass 1 (Dana Point to Point La Jolla) = 23:22-23:52 UTC
Pass 2 (Point La Jolla to Dana Point) = 23:59-00:28 UTC
Pass 3 (Dana Point to Point La Jolla) = 00:37-01:06 UTC
Pass 4 (Point La Jolla to Dana Point) = 01:24-01:48 UTC
Pass 5 (Dana Point Area) = 01:52-01:54 UTC
Pass 6 (Dana Point Area) = 01:56-02:02 UTC
4 calibration passes between 01:10-01:23 UTC
| Type of Source Media: digital file
Raw lidar data output from ALTM 1225
2002-09-09
publication
2002-09-09