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    yonezawa.pptx yonezawa.pptx Presentation Transcript

    • 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
    • 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  
        
    • Full Polarimetry  ~Three component decomposition~
      Surface
      Double Bounce
      Volume
       (Freeman and Durden (1998))
    • 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))
    • ALOS PALSAR
      Study Area
      Area 1
      Area 2
      1km
    • ALOS PALSAR
      Full polarimetric data
      ©MDA
      1km
    • ALOS PALSAR
      3km
      Three Component Decomposition
      27AUG06 12OCT06  
      3km
      18MAY06 24AUG08  
        
        
      R:Double Bounce
      G:Volume
      B:Surface
        
    • 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
    • ALOS PALSAR
      H-a-ADecomposition
      Area 1
      Area 2
      Entropy
      ©MDA
      Alpha
      Anisotropy
      24-Aug-08
      27-Aug-06
      27-Aug-09
    • 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
    • RADARSAT-2
      Test Site
      ©MDA
      Rice field
      1km
    • 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
    • RADARSAT-2   
      3km
      Three Component Decomposition
      29JUN09 23JUL09  
      3km
      16AUG09 9SEP09  
        
        
      R:Double Bounce
      G:Volume
      B:Surface
        
    • RADARSAT-2
      Three Component Decomposition
      ©MDA
      Surface
      Volume
      Double bounce
      1km
    • 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
    • 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
    • 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
    • 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
    • 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