|September 2004 Lidar Point Data of Southern California Coastline: Long Beach to US/Mexican
|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 N6602L) owned and operated by Aspen Helicopter, Inc.
The lidar data set described by this document was collected on 28-30 September 2004;
Julian Days 27204, 27304, and 27404 (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:
950-1150m AGL, and ground speed: 90-132kts. Settings were different on final day of
surveying due to low clouds and flight restrictions: beam divergence: wide, altitude:
320-620m AGL, and ground speed: 101-121kts. Three GPS base stations (Seal Beach, Dana
Point, and Point Loma, 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.