LiDAR provides accurate 3D mapping
(Light Detection and
L and iDAR
Ranging) allows scientists
mapping professionals to
examine natural and man-made
environments with accuracy and
precision.
Airborne LiDAR is a remote
sensing method that uses light
in the form of a pulsed laser to
measure distance to the ground.
These light pulses combined with
other data recorded by airborne
systems generate precise, three-
dimensional information about
the shape of the landscape and its
surface characteristics.
Late last year the Landholders
Driving Change project obtained
LiDAR data to map gully and
hillslope erosion across a specified
area in the BBB.
The data, combined with historical
air photos, can be used to
reconstruct gully erosion rates and
sediment yields.
This information is critical for
determining sediment savings
and the cost-effectiveness of
rehabilitation treatments.
LiDAR will also provide
information used in the design of
on-ground remediation works.
Site
Site 2 2
Site
Site 1 1
Site
Site 3 3
Example cross-section of proposed excavation showing the base of tunnelling
(orange), the existing topography (green) and the final profile (purple)
Mt
Mt Wickham
Wickham
The LiDAR is used to generate cross sections of Property
gullies. The soil
Property
between the green and orange lines will be reshaped and treated to
create a new and more stable surface, represented by the purple line.
The cool thing about this data is we can calculate the amount of soil
that needs to be moved to try and get an understanding of how much
work is required at each site.
ISSUE 1, April, 2018 | P39