|April 2008 Scripps Institute of Oceanography (SIO) Lidar of the Southern California
Coastline: Long Beach to US/Mexico Border
||This lidar point data set collected during low tide conditions along an approximately
500-700 meter wide strip of the Southern California coastline within an area extending
south from Long Beach to the US/Mexico border. Data were collected in Los Angeles,
Orange and San Diego counties from south of the Downtown Long Beach Marina in Long
Beach, California to Oceanside Harbor on April 13, 2008 between 17:17 and 19:52 UTC.
Data were collected in San Diego County from San Onofre to south of the United States-Mexico
border near Playas de Tijuana, Baja California, Mexico on April 12, 2008 between 16:04
and 19:13 UTC. Data set features include water, beach, cliffs, and top of cliffs.
The all points data set contains the complete point cloud of first and last return
elevation and laser intensity measurements recorded during the spring 2008 airborne
lidar survey conducted semi-annually by the University of Texas at Austin for the
Southern California Beach Processes Study. The data set was generated by the processing
of laser range, scan angle, and aircraft attitude data collected using an Optech Inc.
Airborne Laser Terrain Mapper (ALTM) 1225 system and geodetic quality Global Positioning
System (GPS) airborne and ground-based receivers. Instrument settings and parameters
during survey were: Nominal on-ground beam diameter: 25 cm Pulse rate: 25 kHz Maximum
number of returns recorded: 2 Minimum separation between detected returns from a single
pulse: 4.3 m Laser wavelength: 1064 nm Frequency of GPS sampling: 1 Hz Frequency of
IMU sampling: 50 Hz; Scan angle: +/- 20 degrees Nominal height of instrument above
ground: 1100 m Nominal single-swath pulse density: 2 m Nominal aggregate pulse density:
0.75 Nature of vertical control: Kinematic and static GPS points