An Optech
ALTM 3100 was mounted in a Cessna 310 and flown at about 600 m
above ground. The scanner was operated at 70 kHz with a 20° scan
angle. The resulting swaths were about 430 m wide with 15 cm
diameter laser spots. The stated shot spacing per swath was then
0.6 m at nadir and about 1 m at the edge of the swath. Typically, the
plane made five passes to scan a total of 1–1.5 km wide zone spanning
the SAF. The data were gathered by a team lead by Ohio State
University that included USGS, the National Center for Airborne Laser
Mapping (NCALM), and UNAVCO. The data have been made available
publicly. In particular, the GEON project