USING TIME-SERIES APPROACHES TO - Landsat 7 · 2015-06-02 · USING TIME-SERIES APPROACHES TO...
Transcript of USING TIME-SERIES APPROACHES TO - Landsat 7 · 2015-06-02 · USING TIME-SERIES APPROACHES TO...
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USING TIME-SERIES APPROACHES TO
IMPROVE LANDSAT’S CHARACTERIZATION OF
LANDSCAPE DYNAMICS
Project update, October 2013, by Kennedy.
Co-Author: John Rogan, Clark University
Team: Andréfouët, Fraser, Gómez, Hais, Helmer, Hostert,
Pflugmacher, Griffiths, Main-Knorn, Phinn, Scarth, Sonnenschein
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Landsat
Standard
Products
Motivation
Geometry
Clouds
Surface
Reflectance Status
Use
Dynamics
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Valid
Consistent
Generalizable
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Valid
Consistent
Generalizable
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Overall workflow
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Landsat
images
Maps of trends
and events
Yearly maps
of state /
condition
Classification
Vertex
maps
Simplifying &
Filtering Temporal
smoothing
Temporally-
smoothed
imagery
Existing
landcover map
Pre-processing Data stack
LandTrendr
temporal
segmentation
Attribution
Human
interpretation
Maps of change
processes
Maps of change
processes
Yearly maps
of state /
condition
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Consistent
Generalizable
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NBR: (NIR-
SWIR2)/(NIR+SWIR2)
Ledaps + Fmask: Good!
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Year of
Disturbance
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Generalizing
Use MapReduce framework and new
Python/GDAL coding
General framework will be useful for
any pixel-based time series approach
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Year of disturbance: Abrupt
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Slic
e R
ate
of
Ch
an
ge
“History” image
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TC B
rig
htn
ess
TC
Gre
en
ne
ss
TC W
etn
ess
Define patch
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Interpret patch
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Fluvial erosion
Balsam woolly
adelgid
Avalanche
Clearcut
Windthrow
Fire
Agriculture
Development
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Machine learning
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Overall workflow
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Landsat
images
Maps of trends
and events
Yearly maps
of state /
condition
Classification
Vertex
maps
Simplifying &
Filtering Temporal
smoothing
Temporally-
smoothed
imagery
Existing
landcover map
Pre-processing Data stack
LandTrendr
temporal
segmentation
Attribution
Human
interpretation
Maps of change
processes
Maps of change
processes
Yearly maps
of state /
condition
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Yearly land cover mapping
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LandTrendr
Airphoto
C-CAP
White arrows
show
development
The only thing changing is the
spectral value over time
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0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Pe
rce
nt b
y t
y
pe
Time S
i
nce D
i
sturbance
Forest M
a
nag ement
Herbaceous
Evergreeen Forest
Deciduous Forest
Barren L
a
nd
Developed
Perennial S
n
o w/Ice
Open Water
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Pe
rce
nta
ge b
y t
y
pe
Time S
i
nce D
i
sturbance
Increasing Urban
Herbaceous
Evergreeen Forest
Deciduous Forest
Barren L
a
nd
Developed
Perennial S
n
o w/Ice
Open Water
a)
b)
Figure 25. Land cover progression for patches labeled in the attribution phase as (a) forest management and (b) increasing urban. Forest management largely begins as coniferous forest and ends as either coniferous or deciduous forest, with barren and developed classes ref ecting brief periods of complete loss of vegetation cover. Patches modeled as increasing urban do sometimes get labeled as urban, but also include some propor-tion of vegetated classes. As noted in Figure 17, these are likely related to suburban, low-density development with associated lawns and trees.
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Landsat
Standard
Products
Motivation
Geometry
Clouds
Surface
Reflectance Status
Use
Dynamics
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We will be forced to articulate
these for the temporal domain!
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* Landscape Change Monitoring System –
USGS and USFS
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Single image normalization: L5 vs. OLI
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Blue Green Red
NIR SWIR 1 SWIR 2
OLI
L
5
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NBR* From OLI NBR From L5
* NBR: (NIR-
SWIR2)/(NIR+SWIR2)
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NBR From OLI NBR From L5
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Consistent