1. POLARIMETRIC OBSERVATION FOR RICE FIELD BY RADARSAT-2 AND ALOS/PALSAR
Chinatsu YONEZAWA1) ,Takahiro IMAI1) , Daisuke KUNII1) , Manabu WATANABE 2) and Genya SAITO3)
1)Tohoku University, 2)JAXA, 3)Tokyo Institute of Technology

2. Rice Field Monitoring by Multi-temporal Space-borne
Introduction
Rice Field Monitoring by
Multi-temporal Space-borne
Full Polarimetric SAR
:scattering characteristics
ALOS PALSAR　　L-band
RADARSAT-2　　 C-band
　　・ Three component decomposition
　　・ H-a-A decomposition　　

3. Full Polarimetry ~Three component decomposition~
Double Bounce
Volume
Surface
　 (Freeman and Durden (1998))

4. Full Polarimetry ~ H-a -A decomposition ~
Entropy
　　Randomness of the scattering
Anisotropy
　　Relative scattering of the second and the third eigenvalues
Alpha
　　Indicator of the type of scattering mechanism
　　 0°:plane °:dipole °:dihedral corner reflector
　 (Cloude and Pottier (1996, 1997))

5. ALOS PALSAR
Study Area
Area 1
Area 2
1km

6. Full polarimetric data
ALOS PALSAR
Full polarimetric data
Date
Off-nadir angle
Asc./Desc.
Growth stage of paddy
19-May-06
21.5°
Desc.
transplanted
27-Aug-06
Asc.
grain filling
12-Oct-06
harvested
14-Apr-07
30-May-07
24-Aug-08
9-Oct-08
24-Nov-08
2-Dec-08
19-Apr-09
27-Aug-09
12-Oct-09
©MDA
1km

7. Three Component Decomposition
ALOS PALSAR
Three Component Decomposition
3km
27AUG OCT06　　
3km
18MAY AUG08　　
R:Double Bounce
G:Volume
B:Surface

8. Three Component Decomposition
ALOS PALSAR
Three Component Decomposition
Surface
©MDA
Volume
Double bounce
27-Aug-06
24-Aug-08
27-Aug-09 A A A A D D D A A D D
1km

9. H-a-A Decomposition ALOS PALSAR Area 1 Area 2 Entropy Alpha Anisotropy
©MDA
Alpha
Anisotropy
27-Aug-06
24-Aug-08
27-Aug-09

10. ALOS PALSAR Three component decomposition: H-a-A decomposition:
Main scattering component of rice field
:Grain filling season - Double bounce scattering
:Harvested ~ Transplanting season - Surface scattering
H-a-A decomposition:
Alpha angle
-relationship with rice filed condition

11. RADARSAT-2
Test Site
©MDA
Rice field
1km

12. RADARSAT-2 Data Full Polarization 23-Jul-09 16-Aug-09 9-Sep-09
　Fine QP　 (incidence angle 20.1° Des.)　resolution: 11×9m
29-Jun-09
23-Jul 　
16-Aug-09
9-Sep-09　　　
©MDA

13. Three Component Decomposition
RADARSAT-2 　　
Three Component Decomposition
3km
29JUN JUL09　　
3km
16AUG SEP09　　
R:Double Bounce
G:Volume
B:Surface

14. Three Component Decomposition
RADARSAT-2
Three Component Decomposition
©MDA
Surface
Volume
Double bounce
1km

15. Three Component Decomposition
ALOS PALSAR
RADARSAT-2
Surface
Volume
Double bounce
Double bounce scattering
Volume scattering
©MDA
Dominant scattering component on grain filling season
1km

16. RADARSAT-2 H-a-A decomposition Entropy Alpha Anisotropy 0.7 0.6 0.5
0.4 50 40 30 20
Entropy
Alpha
29Jun-09
23-Jul-09
16-Aug-09
9-Sep-09
29Jun-09
23-Jul-09
16-Aug-09
9-Sep-09
0.7
0.6
0.5
0.4
Anisotropy
29Jun-09
23-Jul-09
16-Aug-09
9-Sep-09

17. H-a-A decomposition ALOS PALSAR RADARSAT-2 Alpha Alpha Anisotropy50 40 30 20
Alpha
Alpha
29Jun-09
23-Jul-09
16-Aug-09
9-Sep-09
0.7
0.6
0.5
0.4
Anisotropy
Anisotropy
29Jun-09
23-Jul-09
16-Aug-09
9-Sep-09

18. RADARSAT-2 Three component decomposition: H-a-A decomposition:
Volume scattering component ratio
– Useful to estimate rice growing process
H-a-A decomposition:
Alpha angle
– Increasing with growth
©MDA
1km

19. Summary ◆PALSAR(L-band) and RADARSAT-2(C-band)
　　　　⇒rice grain filling season
Main scattering component on three component decomposition
PALSAR: double bounce scattering
RADARSAT-2: volume scattering
　　　　⇒scattering mechanism difference
L-band transmit paddy rice field
★ H-a-A decomposition
PALSAR, RADARSAT-2:
Entropy: 0.5~ Alpha: 40 ~ 50 °Anisotropy: 0.6~0.7