The applications of InSAR technique for natural hazard detection in smart society
2020
Synthetic Aperture Radar (SAR) is a potential application of remote sensing to
geological and hydrometeorological hazards. This paper presents sustainability strategies for
smart cities: the use of SAR Sentinel-1 for monitoring flood inundation and landslide hazards in
Aceh Province, Indonesia. In this study, for flood detection, we attempt to uses Sentinel-1A (S1A)
in
the
same
direction
and
acquisition
through
polarization
of
Vertical
transmit
and
Vertical
received
(VV)
–
Vertical
transmit
and
Horizontal
received
(VH)
with
a
temporal
baseline
of
6
days.
Those
data
were
then
analysed
using
the
SNAP
Toolbox.
The
results
showed
that
the
S1A
was
successfully
for
detecting
a
flood
inundation
in
which
VH
polarization
is
more
sensitive
than
VV.
For
landslide
monitoring,
we
apply
multitemporal
SAR
images,
where
one
of
them
is
the
Quasi-Persistent Scatterers (Q-PS) technique. Using ascending and descending orbit pass
results in a better velocity map where both sides of the slope are detected due to the different
sensor angle of both orbital passes. This technique has resulted in the undulating areas being
monitored well and this will also fill the gap of layover and shadowing phenomena of the slant
range SAR image. The Q-PS combinations were very effective to identify the deformation
features associated with the land movement. For a smart city, natural hazards such as landslides
and floods require continuous monitoring to ensure the potential as well as management and
mitigation of natural hazards. Therefore, the InSAR technique is one of the effective ways for
doing this strategy
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