Remote Sensing Applications Society and Environment,
Journal Year:
2024,
Volume and Issue:
36, P. 101335 - 101335
Published: Aug. 28, 2024
Forests
are
crucial
in
delivering
ecosystem
services
that
underpin
human
well-being
and
biodiversity
conservation.
However,
these
vital
ecosystems
threatened
by
forest
degradation
rapid
urbanisation.
This
study
addresses
this
challenge
proposing
a
comprehensive
framework
for
mapping
natural
forests
at
the
municipal
scale.
The
integrates
remote
sensing
techniques
with
machine
learning
algorithms
to
provide
valuable
insights
into
extent
of
within
eThekwini
Municipality.
utilised
Landsat
7,
8,
9
satellite
imagery
analyse
map
historical
current
distribution
forests.
Five
spectral
indices,
namely,
Normalized
Differential
Vegetation
Index
(NDVI),
Green
Difference
(GNDVI),
Chlorophyll
(CIG),
Enhanced
(EVI),
Index-2
(EVI-2),
which
were
calculated
from
bands,
employed
analysis.
Light
Gradient
Boosting
Machine
(LightGBM),
Categorical
(CatBoost),
Extreme
(XGBoost)
used
model
distribution.
Accuracy
was
assessed
through
confusion
matrices,
Receiver
Operating
Characteristic
(ROC)
Curves,
area
under
ROC
curve
(AUC),
F1
scores.
LightGBM
achieved
highest
overall
accuracy
(90.76%),
followed
CatBoost
(89.56%)
XGBoost
(84.34%).
also
obtained
best
score
(90.76%).
These
findings
highlight
LightGBM's
effectiveness
classifying
forests,
making
it
preferred
classifications
based
on
7
significantly
underestimated
area,
whereas
8
data
revealed
an
increase
2015
2023.
will
guide
effective
targeted
rehabilitation
restoration
efforts,
ensuring
preservation
enhancement
services.
International Journal of Applied Earth Observation and Geoinformation,
Journal Year:
2024,
Volume and Issue:
132, P. 104068 - 104068
Published: Aug. 1, 2024
Aerosols
are
crucial
constituents
of
the
atmosphere,
with
significant
impacts
on
air
quality.
Aerosol
optical
depth
(AOD)
is
critical
in
assessing
solar
resources
and
modeling
sky
radiance.
However,
comprehensive
aerosol
studies
at
a
continental
scale
limited,
existing
methodologies
need
to
consider
spatial
characteristics.
This
study
develops
spatio-temporal
unmixing
heterogeneity
(STUH)
model
evaluate
patterns
temporal
trends
atmospheric
aerosols
across
African
continent.
The
AOD
data
cube,
comprising
monthly
averaged
MODIS-derived
from
2001
2015,
was
decomposed
using
spatially
non-negative
matrix
variabilization
explore
determinants
their
interactions
geographically
optimal
zones-based
(GOZH)
model.
Our
findings
reveal
an
increasing
trend
levels
Africa
past
15
years,
combined
pattern
explained
by
five
abundance
variables.
We
find
that
different
regions
Africa,
impact
natural
variables
1.56
3.01
times
human
variables,
variations.
These
results
essential
for
understanding
climatic
implications
Africa.
Remote Sensing Applications Society and Environment,
Journal Year:
2024,
Volume and Issue:
36, P. 101335 - 101335
Published: Aug. 28, 2024
Forests
are
crucial
in
delivering
ecosystem
services
that
underpin
human
well-being
and
biodiversity
conservation.
However,
these
vital
ecosystems
threatened
by
forest
degradation
rapid
urbanisation.
This
study
addresses
this
challenge
proposing
a
comprehensive
framework
for
mapping
natural
forests
at
the
municipal
scale.
The
integrates
remote
sensing
techniques
with
machine
learning
algorithms
to
provide
valuable
insights
into
extent
of
within
eThekwini
Municipality.
utilised
Landsat
7,
8,
9
satellite
imagery
analyse
map
historical
current
distribution
forests.
Five
spectral
indices,
namely,
Normalized
Differential
Vegetation
Index
(NDVI),
Green
Difference
(GNDVI),
Chlorophyll
(CIG),
Enhanced
(EVI),
Index-2
(EVI-2),
which
were
calculated
from
bands,
employed
analysis.
Light
Gradient
Boosting
Machine
(LightGBM),
Categorical
(CatBoost),
Extreme
(XGBoost)
used
model
distribution.
Accuracy
was
assessed
through
confusion
matrices,
Receiver
Operating
Characteristic
(ROC)
Curves,
area
under
ROC
curve
(AUC),
F1
scores.
LightGBM
achieved
highest
overall
accuracy
(90.76%),
followed
CatBoost
(89.56%)
XGBoost
(84.34%).
also
obtained
best
score
(90.76%).
These
findings
highlight
LightGBM's
effectiveness
classifying
forests,
making
it
preferred
classifications
based
on
7
significantly
underestimated
area,
whereas
8
data
revealed
an
increase
2015
2023.
will
guide
effective
targeted
rehabilitation
restoration
efforts,
ensuring
preservation
enhancement
services.