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  • 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. Introduction
    Rice Field Monitoring by
    Multi-temporal Space-borne
    Full Polarimetric SAR
    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~
    Surface
    Double Bounce
    Volume
     (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°:plane45°:dipole 90°:dihedral corner reflector
     (Cloude and Pottier(1996, 1997))
  • 5. ALOS PALSAR
    Study Area
    Area 1
    Area 2
    1km
  • 6. ALOS PALSAR
    Full polarimetric data
    ©MDA
    1km
  • 7. ALOS PALSAR
    3km
    Three Component Decomposition
    27AUG06 12OCT06  
    3km
    18MAY06 24AUG08  
      
      
    R:Double Bounce
    G:Volume
    B:Surface
      
  • 8. ALOS PALSAR
    Three Component Decomposition
    Surface
    ©MDA
    Volume
    Double bounce
    24-Aug-08
    27-Aug-06
    27-Aug-09
    A
    A
    A
    D
    D
    A
    D
    D
    A
    D
    A
    1km
  • 9. ALOS PALSAR
    H-a-ADecomposition
    Area 1
    Area 2
    Entropy
    ©MDA
    Alpha
    Anisotropy
    24-Aug-08
    27-Aug-06
    27-Aug-09
  • 10. ALOS PALSAR
    • Three component 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
     Fine QP  (incidence angle 20.1°Des.) resolution: 11×9m
    29-Jun-09
    23-Jul-09 
    16-Aug-09
    9-Sep-09   
    ©MDA
  • 13. RADARSAT-2   
    3km
    Three Component Decomposition
    29JUN09 23JUL09  
    3km
    16AUG09 9SEP09  
      
      
    R:Double Bounce
    G:Volume
    B:Surface
      
  • 14. RADARSAT-2
    Three Component Decomposition
    ©MDA
    Surface
    Volume
    Double bounce
    1km
  • 15. Three Component Decomposition
    RADARSAT-2
    ALOS PALSAR
    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
    50
    40
    30
    20
    0.7
    0.6
    0.5
    0.4
    Entropy
    Alpha
    29Jun-09
    23-Jul-09
    9-Sep-09
    29Jun-09
    23-Jul-09
    9-Sep-09
    16-Aug-09
    16-Aug-09
    0.7
    0.6
    0.5
    0.4
    Anisotropy
    29Jun-09
    23-Jul-09
    9-Sep-09
    16-Aug-09
  • 17. H-a-A decomposition
    RADARSAT-2
    ALOS PALSAR
    50
    40
    30
    20
    Alpha
    Alpha
    29Jun-09
    23-Jul-09
    9-Sep-09
    16-Aug-09
    0.7
    0.6
    0.5
    0.4
    Anisotropy
    Anisotropy
    29Jun-09
    23-Jul-09
    9-Sep-09
    16-Aug-09
  • 18. RADARSAT-2
    • Three component 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: 0.5~0.6 Alpha: 40 ~ 50 °Anisotropy: 0.6~0.7