2009 US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical
Center of Expertise (JALBTCX) Bathymetric Lidar: Southern California
This kmz file shows the extent of coverage for the 2009 USACE JALBTCX Southern California
Bathy Lidar data set.
These files contain bathymetric lidar data collected by the SHOALS-1000T system along
the coast of California. Data coverage generally extends along the coastline from
the waterline offshore 1,000 meters or to laser extinction. Exclusively in areas where
Fugro Pelagos acquired or planned to acquire multibeam sonar data by December 31,
2009, data coverage extends from the shoreline either to the 10-m contour, the 20-m
contour or the landward extent of the multibeam data plus an additional 100 m offshore.
The SHOALS system has a pulse repetition rate of 1 kHz at 532 nm (green wavelength).
Native lidar data is not generally in a format accessible to most Geographical Information
Systems (GIS). Specialized in-house and commercial software packages are used to process
the native lidar data into 3-dimensional positions that can be imported into GIS software
for visualization and further analysis. Horizontal positions, provided in decimal
degrees of latitude and longitude, are referenced to the North American Datum of 1983
(NAD83). Vertical positions are referenced to the NAD83 ellipsoid and provided in
meters. The National Geodetic Survey's (NGS) GEOID09 model is used to transform the
vertical positions from ellipsoid to orthometric heights referenced to the North American
Vertical Datum of 1988 (NAVD88). Both ellipsoidal and orthometric heights were provided
to NOAA CSC. For data storage and Digital Coast provisioning, NOAA CSC processed the
ellipsoidal height data.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
Documentation links not available.
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||High water turbidity in the survey area hindered the acquisition of bathymetric data
in boxes 23,24,25,31,33,34,35 and 36 and resulted in incomplete coverage.
||These data were collected as a part of the National Coastal Mapping Program (NCMP)
to depict the elevations above and below the water line in the California coastal
||2009-09-28 to 2009-10-28
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- U.S. Army Corps of Engineers, Mobile District
- ASCII XYZ
- DOD/US Army/USACE/SAM/Mobile
- United States
- Orange County
- Los Angeles County
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| Processing Steps
- These data were collected using the SHOALS-1000T system. It is owned by Fugro Pelagos
Inc. and operated through contract. The system collects bathymetric lidar data at
1kHz and RGB imagery at 1Hz. A CASI-2 hyperspectral line scanner is integrated with
the system as well. Aircraft position, velocity and acceleration information are collected
through a combination of Novatel and POS A/V 410 equipment. All raw data streams are
transferred to the office for downloading and processing in SHOALS GCS software. Aircraft
position data are processed using POSPac software and the results are combined with
the lidar data to produce 3-D positions for each lidar shot. Upon inspection and QA/QC
in the software package Fledermaus, anomalous data are flagged as invalid. FPI Workbench
then converts all valid data from ellipsoid to orthometric heights based on the NGS'
GEOID09 model and exports data as a series of bathymetry (H) ASCII files. The bathymetry
files contain all of the returns from the bathymetric sensor which include returns
both above and below the water.
- The NOAA Coastal Services Center (CSC) received ASCII formatted data in geographic
coordinates and ellipsoid heights in meters. The files contained lidar intensity and
elevation measurements. CSC performed the following processing for data storage and
Digital Coast provisioning purposes: 1. The data were converted from ASCII format
to LAS format. 2. The data were classified as 11 (Bathymetry). 3. The processed las
files were zipped.
- Times had originally been stored as POSIX seconds when converted to LAS. This was
switched to adjusted GPS time (GPS seconds - 1e9) to conform to the LAS 1.2 standard.
- The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp
transfer from the NOAA Coastal Services Center. The data are currently
being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS or LAZ
The LAS format is an industry standard for LiDAR data developed by the American Society
of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version
LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively
in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically
the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most
up to date geoid model when transforming to orthometric heights.
Metadata Last Modified: 2014-03-14
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