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

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　　

Full Polarimetry ~Three component decomposition~ Double Bounce Volume Surface 　 (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°:plane 45°:dipole 90°:dihedral corner reflector 　 (Cloude and Pottier (1996, 1997))

ALOS PALSAR Study Area Area 1 Area 2 1km

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

Three Component Decomposition ALOS PALSAR Three Component Decomposition 3km 27AUG06 12OCT06　　 3km 18MAY06 24AUG08　　 R:Double Bounce G:Volume B:Surface

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

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

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

RADARSAT-2 Test Site ©MDA Rice field 1km

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-09 　 16-Aug-09 9-Sep-09　　　 ©MDA

Three Component Decomposition RADARSAT-2 　　 Three Component Decomposition 3km 29JUN09 23JUL09　　 3km 16AUG09 9SEP09　　 R:Double Bounce G:Volume B:Surface

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

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

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

H-a-A decomposition ALOS PALSAR RADARSAT-2 Alpha Alpha Anisotropy 50 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

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

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