Land
subsidence
has
attracted
widespread
attention
because
of
its
potential
hazards
to
sustainable
urban
development.
The
traditional
methods
for
estimating
land
disregard
the
crucial
aspect
altitude
by
analyzing
spatial
data
solely
on
2D
plane
(longitude
and
latitude
geographic
coordinates).
This
research
incorporates
feature
into
construction
matrix
develop
a
new
method
named
spatially
multiscale
geographically
weighted
regression
(SM-GWR)
better
estimation
subsidence,
enabling
determine
optimal
bandwidth
at
3D
scales.The
proposed
method's
feasibility
is
confirmed
through
examples
in
China
Singapore.
case
study
results
demonstrate
that:
(1)
SM-GWR
model
shows
significant
improvement
fitting
compared
method;
(2)
contribution
influencing
factors
highly
related
nature
properties
development
city.
Journal of Lightwave Technology,
Journal Year:
2024,
Volume and Issue:
42(10), P. 3944 - 3953
Published: Feb. 7, 2024
In
this
paper,
the
cyclic
shift
method
is
provided
to
solve
phase
wrapping
problem
of
relative
due
initial
wavelength
error
by
a
pure
theoretical
algorithm
in
optical
frequency
domain
reflectometry
(OFDR)
system.
The
reduces
experimental
equipment
requirements
and
can
be
extended
all
system
uses
demodulation
Hilbert-Euclidean
distance
substitution
presented
strain
area
with
complete
preservation
information.
What's
more,
wavelet
denoising
two-dimensional
weighted
map
proposed,
which
able
measure
spatial
resolution
9.07
mm,
accuracy
0.5
μ
$\varepsilon$
maximum
0.225
range
36
m,
based
on
eight
measurements.
This
has
lower
than
cross-correlation
averaging
method,
it
make
full
use
multiple
sets
information
every
point,
solves
high
static
measurement
medium
distance.
Sensors,
Journal Year:
2023,
Volume and Issue:
23(15), P. 6863 - 6863
Published: Aug. 2, 2023
Mastering
the
strain
transfer
mechanism
in
distributed
fiber
optic
(DFO)
sensors
holds
key
to
analyzing
measurement
errors
from
DFO
sensing
systems.
However,
impact
of
monitored
structure's
distribution
on
has
often
been
overlooked
existing
research.
To
address
this
issue,
a
model
surface-bonded
with
multilayered
structures
was
established
based
shear
lag
theory.
The
closed-form
solutions
coefficient
subjected
uniform,
parabolic,
single-linear
gradient,
and
bilinear
gradient
strains
were
obtained.
With
high-accuracy
optical
frequency-domain
reflectometer
(OFDR),
theoretical
validated
by
laboratory
tests.
Upon
parametric
analysis,
suggestions
further
offered
about
designing
installing
sensors.
