tu2.l09.4 - polarimetric scattering analysis for accurate observation of stricken man-made targets...
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TRANSCRIPT
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Polarimetric Scattering Analysis For Accurate Observation of
Stricken Man-made Targets Using A Rotated Coherency Matrix
Ryoichi Sato*, Yoshio Yamaguchi,and Hiroyoshi Yamada
Niigata University, Japan
IGARSS2010, July 25-30, 2010, Honolulu, Hawaii, USA
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- June 15, 2008 Iwate-Miyagi Nairiku Earthquake, Japan, M7.2
IntroductionM7.0 class big earthquakes successively occurred in JAPAN not only in urban areas but also in severe mountainous areas
- March 20, 2005 West of Fukuoka Prefecture Earthquake, Japan, M7.0
- March 25, 2007 Noto Hanto Earthquake, Japan, M6.9
- July 16, 2008 Niigataken Chuetsu-oki Earthquake, Japan, M6.8
- October 23, 2004 Mid-Niigata Prefecture Earthquake, Japan, M6.8
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Introduction
To escape damages of secondary disasters
Grasp the situation around the disaster area
Copyright©1998-2006 NTT DATA CORPOLATION Copyright©1998-2006 NTT DATA CORPOLATION
Difficulty of on-site inspections
Immediately after big earthquake…
*We express our sincere appreciations to Prof. Makino and NTT data for providing these high resolution photos.
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Introduction
To escape damages of secondary disasters
Grasp the situation around the disaster area
Radar remote sensing based on POLSAR image analysis
ALOS/PALSAR
http://www.alos-restec.jp/aboutalos1.html
Space-borne POLSAR
Pi-SAR
Air-borne POLSAR
quad. POLSAR data acquisition
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Introduction
10
10
000
2
1
800
075
0515
30
1
000
01
0
000
0
01*
2
2
*
j
jffffT cvds
PdPs Pv Pc
Scattering power decomposition [1]-[3]
[1] A. Freeman and S. L. Durden, ``A Three-component scattering model for polarimetric SAR data,`` IEEE Trans. Geosi. Remote Sensing, Vol.36, No. 3, pp. 963-973, May 1998.
[2] Y. Yamaguchi, T. Moriyama, M. Ishido and H. Yamada, ``Four-Component Scattering Model for Polarimetric SAR Image Decomposition,`` IEEE Trans. Geosi. Remote Sensing, Vol.43, No.8, pp.1699-1706, Aug. 2005.
[3] Y. Yajima, Y. Yamaguchi, R. Sato and H. Yamada, ``POLSAR image analysis of wetlands using a modified four-component scattering power decomposition,`` IEEE Trans. Geosi. Remote Sensing, Vol.46, No.6, pp.1667-1673, June 2008.
2/sin)( p
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Introduction
Ps
Pd
Pv
illu
min
atio
n
SAPPORO
Urban area
Misclassification of man-made targets
Strong volume scattering
Targets are aligned obliquely to the illumination
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Introduction
Strong Pd
Furthermore…
Before earthquake After earthquake
Weak Pd
Strong Ps
Strong Pv
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Objective
Accuracy improvement of man-made target detection/extraction in POLSAR image analysis
Introduction of ``unitary rotation[4],[5]’’ of the coherency matrix
FDTD polarimetric scattering analysis for simplified man-made target model
To check the validity of the rotation,
[4] J.-S. Lee and D.L.Schuler and T. L. Ainsworth, ``Polarimetric SAR data Compensation for Terrain Azimuth Slope Variation,” IEEE Trans. Geosi. Remote Sensing, vol.38, no.5, pp.2153-2163, Sept. 2000.
[5] H. Kimura, K.P.Papathanassiou, and I. Hajnsek, ``Polarization orientation angle effects in urban areas on SAR data,” Proc. of IGARSS 2005, Seoul, South Korea, July 2005.
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Derivation of ``rotation angle’’
10
10
000
2
1
800
075
0515
30
1
000
01
0
000
0
01*
2
2
*
j
jffffT cvds
PdPs Pv Pc
2/sin)( p
Scattering power decomposition (4-components model):
[1] A. Freeman and S. L. Durden, ``A Three-component scattering model for polarimetric SAR data,`` IEEE Trans. Geosi. Remote Sensing, Vol.36, No. 3, pp. 963-973, May 1998.
[2] Y. Yamaguchi, T. Moriyama, M. Ishido and H. Yamada, ``Four-Component Scattering Model for Polarimetric SAR Image Decomposition,`` IEEE Trans. Geosi. Remote Sensing, Vol.43, No.8, pp.1699-1706, Aug. 2005.
[3] Y. Yajima, Y. Yamaguchi, R. Sato and H. Yamada, ``POLSAR image analysis of wetlands using a modified four-component scattering power decomposition,`` IEEE Trans. Geosi. Remote Sensing, Vol.46, No.6, pp.1667-1673, June 2008.
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x
xx
xx
T reflection
00
0
0
Reflection symmetry
u
//u
0~~ **HVVVVHHH SSSS
Derivation of ``rotation angle’’Scattering power decomposition (4-components model):
10
10
000
2
1
800
075
0515
30
1
000
01
0
000
0
01*
2
2
*
j
jffffT cvds
PdPs Pv Pc
Measured coherency matrix
2/sin)( p
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xx
xx
x
T rotation
0
0
00
Rotation symmetry
Derivation of ``rotation angle’’Scattering power decomposition (4-components model):
10
10
000
2
1
800
075
0515
30
1
000
01
0
000
0
01*
2
2
*
j
jffffT cvds
PdPs Pv Pc
Measured coherency matrix
2/sin)( pu
//u
Roll invariant
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xx
xx
x
T rotation
0
0
00
Rotation symmetry
x
xx
xx
T reflection
00
0
0
Reflection symmetry
Derivation of ``rotation angle’’Scattering power decomposition (4-components model):
10
10
000
2
1
800
075
0515
30
1
000
01
0
000
0
01*
2
2
*
j
jffffT cvds
PdPs Pv Pc
Measured coherency matrix
2/sin)( p
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10
10
000
2
1
800
075
0515
30
1
000
01
0
000
0
01*
2
2
*
j
jffffT cvds
2**
*2*
**2
4)(2)(2
)(2)()(
)(2))((
2
1
HVVVHHHVVVHHHV
VVHHHVVVHHVVHHVVHH
VVHHHVVVHHVVHHVVHH
SSSSSSS
SSSSSSSSS
SSSSSSSSS
T
Derivation of ``rotation angle’’Scattering power decomposition (4-components model):
PdPs Pv Pc
Measured coherency matrix2/sin)( p
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Derivation of ``rotation angle’’
2**
*2*
**2
4)(2)(2
)(2)()(
)(2))((
2
1
HVVVHHHVVVHHHV
VVHHHVVVHHVVHHVVHH
VVHHHVVVHHVVHHVVHH
SSSSSSS
SSSSSSSSS
SSSSSSSSS
T
Measured coherency matrix
Expanded coherency matrix
000
0
012
*
000
01
0*
2
800
075
0515
30
1
800
075
0515
30
1
100
010
002
4
1
10
10
000
2
1
j
j
PdPs Pv Pc
Inconsistency)(2 *13 VVHHHV SSST *
31 )(2 VVHHHV SSST 0
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Derivation of ``rotation angle’’``Rotation’’ of the measured coherency matrix
2cos2sin0
2sin2cos0
001
2cos2sin0
2sin2cos0
001
TT
02cos2sin 131213 TTT
Condition for determining the rotation angle
12
131tanˆ2T
T
So we obtain the rotation angle as
Complex angle
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Derivation of ``rotation angle’’
after carrying out the averaging processing,
12
13
12
13 ImReT
T
T
T
- For obliquely oriented man-made target area
We approximately choose the rotation angle as
ˆRe~
12
131tanˆ2T
T
'13T becomes small, but not zero.
it is often observed
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Modified algorithm with Re{T13} rotation
2cos2sin0
2sin2cos0
001
2cos2sin0
2sin2cos0
001
TT
02cos2sin 131213 TTT
1. Determination of the rotation angle
2. Obtain the rotated coherency matrix using T
3. Scattering power decomposition for the rotated matrix T
Pre-processing
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Modified algorithm with T33 rotation
2cos2sin0
2sin2cos0
001
2cos2sin0
2sin2cos0
001
TT
0/)(33 dTd Minimize
2. Obtain the rotated coherency matrix using T
3. Scattering power decomposition for the rotated matrix T
Pre-processing
'33T
1. Determination of the rotation angle
In the previous presentation by Prof. Yamaguchi (in EUSAR2010 etc. )
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POLSAR data description
Mode: Quad.Pol. HH+HV+VH+VV
Pi-SAR
Quad. polarimetric data take function
Pi-SAR**
Resolution 3m by 3m
Total pixel number (entire region)
6,000 by 4,000
Averaging size (pixels) 5 by 5
Incident angle [deg.]
L-band 1.27GHz (l=0.236m)
**Acquired by NiCT, JAXA, Japan
Date
11/04/2004 Yamakoshi
27.2-53.3 deg.(Near - Far)
42.9 deg.(Center)
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Result
illu
min
atio
n
w/o rotation
Ps
Pd
Pv
Yamakoshi (Niigata, Japan)
11/04/2004
area A
area B
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Result for area A
Ps
Pd
Pv
illu
min
atio
n
w/o rotation T33 rotation
Re{T13} rotationYamakoshi (Niigata, Japan)
11/04/2004
illu
min
atio
nil
lum
inat
ion
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Result for area B il
lum
inat
ion
w/o rotation T33 rotation
Ps
Pd
Pv
Yamakoshi (Niigata, Japan) Re{T13} rotation
11/04/2004
illu
min
atio
nil
lum
inat
ion
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Polarimetric FDTD analysisPolarimetric scattering analysis for a quad man-made
target model by using the FDTD method
f
q
Plane wave incidence
f=1.2GHz (L-band)
H-pol
V-pol
x
y
z
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f= 5 to 35 [deg.]
Polarimetric FDTD analysisParameters in the FDTD analysis
f
q
=45 [deg.]
f=1.2GHz (L-band)
H
W
W=L=1.2m (4.8l)
H=1.6m (6.4l)
Permittivity & conductivity
main part: e r=4 s=0.0070
base part: e r=7 s=0.0141
(er=4-j0.2 at 1.2GHz )
(er=7-j0.1 at 1.2GHz )
H-pol
V-pol
Analytical region
Cubic cell size DTime step Dt
Incident pulse
Absorbing boundary condition
700 X 700 X 350 cells
0.01m
1.925 X 10-11 s
Lowpass Gaussian pulse
PML (8 layer)
D
D=0.3m (1.2l)
R
R=3.0m (12.0l)L
x
y
z
f:variable
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Polarimetric FDTD analysis
Plain view
To evaluate statistical polarimetric scattering feature as actual POLSAR image analysis,
Statistical evaluation
y
x
Ensemble average processing is carried out for 10 degs. squint anguler range (Average of 10 angles).
15-25deg.5-15deg.Squint angle
y
x
y
x25-35deg.
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y
x
5-15deg.
Polarimetric FDTD analysis
Pt=Pd+Ps+Pv+Pc
=45o
Pd/Pt Ps/Pt Pv/Pt Pc/Pt0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00w/o rotation
Pd/Pt Ps/Pt Pv/Pt Pc/Pt0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00Re{T13} rotation
Pd/Pt Ps/Pt Pv/Pt Pc/Pt0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00 T33 rotation
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y
x
15-25deg.
Polarimetric FDTD analysis
Pt=Pd+Ps+Pv+Pc
=45o
Pd/Pt Ps/Pt Pv/Pt Pc/Pt0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00w/o rotation
Pd/Pt Ps/Pt Pv/Pt Pc/Pt0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00Re{T13} rotation
Pd/Pt Ps/Pt Pv/Pt Pc/Pt0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00 T33 rotation
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y
x
25-35deg.
Polarimetric FDTD analysis
Pt=Pd+Ps+Pv+Pc
=45o
Pd/Pt Ps/Pt Pv/Pt Pc/Pt0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00w/o rotation
Pd/Pt Ps/Pt Pv/Pt Pc/Pt0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00Re{T13} rotation
Pd/Pt Ps/Pt Pv/Pt Pc/Pt0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00 T33 rotation
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Polarimetric FDTD analysisSummary of the rotation effect
5-15
15-25
25-35
Re{T13} rotation T33 rotationSquint angle
(No need) (No need)
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Conclusion
Re{T13} and T33 rotations are both valid.
Accuracy improvement of man-made target detection/extraction in POLSAR image analysis
``Unitary rotation’’ of the coherency matrix
From the results of POLSAR image analysis
Confirmation of the validity of ``rotation’’
The ``rotation’’ is efficient at least up to 30o in squint angular range
FDTD polarimetric scattering analysis for simplified man-made targets
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Outlook
Determination of more appropriate/rigorous rotation angle
More accurate man-made targets detection/extraction
FDTD polarimetric scattering analysis for man-
made target model on slope/rough ground
in stricken area i.e.
in inclined and/or rough surface area
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Acknowledgments- The authors express their sincere appreciations to JAXA and NiCT, Japan, for providing valuable ALOS/PALSAR and Pi-SAR image data sets.
- This research was partially supported by A Scientific Research Grant-In-Aid (19510183) from JSPS, Japan, and Telecom Engineering Center (TELEC).
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Thank you!