.: Airborne Laser Scanner
uses Riegl LMS-Q560 digital waveform scanners with high
infrared laser pulse repetition rates up to 240 kHz. They
meet the most challenging requirements in airborne laser
scanning as they provide full waveform analysis for
unlimited numbers of target echoes.
Waveform laser scanner
provides continuous pulse return without apparent dead time.
The waveform is analyzed with respect to echo and amplitude
where all returns are digitized, producing the highest
density of points, including ground points.
Conventional LiDAR scanners are inferior
because they have an inherent sensor dead time of 8nsec
(equivalent to 1.2m distance in height), which leads to
non-measurement of elevation points. In particular, ground
returns will be missed in densely vegetated areas such as
long grass and low shrub areas. In contrast, waveform laser
scanners do not have any sensor dead time and much more
detailed data of targets could be captured. In the case of
forest application for instance, detailed canopy structure
could be captured thus facilitating tree characterization
GDS’s waveform LiDAR systems also allow
for return waveform to be analyzed, giving insight into the
slope, surface roughness and composition at each point