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 　　　　

Double Bounce Volume Surface

　 (Freeman and Durden (1998))

Full Polarimetry 　 ~Three component decomposition~

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

1km

Study Area

Area 1

Area 2

ALOS PALSAR

Full polarimetric data

1km

©MDA

　 Date Off-nadir angle Asc./Desc. Growth stage of paddy

19-May-06 21.5° Desc. transplanted 27-Aug-06 21.5° Asc. grain filling 12-Oct-06 21.5° Asc. harvested 14-Apr-07 21.5° Asc. harvested 30-May-07 21.5° Asc. transplanted 24-Aug-08 21.5° Desc. grain filling 9-Oct-08 21.5° Desc. harvested

24-Nov-08 21.5° Desc. harvested 2-Dec-08 21.5° Asc. harvested 19-Apr-09 21.5° Asc. harvested 27-Aug-09 21.5° Desc. grain filling 12-Oct-09 21.5° Desc. harvested

3km

3km

27AUG06 12OCT06 　　

18MAY06 24AUG08 　　

　　

　　 R:Double BounceG:VolumeB:Surface

　　

ALOS PALSARThree Component Decomposition

ALOS PALSARThree Component Decomposition

1km

©MDA

19-May-06

12-Oct-06

30-May-07

9-Oct-08

2-Dec-08

27-Aug-090%

20%

40%

60%

80%

100%

D

Surface

Volume

Double bounce

27-Aug-06

24-Aug-08

27-Aug-09

A D DDD DA A A AA

19-May-06

27-Aug-06

12-Oct-06

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

0.3

0.4

0.5

0.6

0.7

ALOS PALSAR

H-a-A Decomposition

©MDA

Entropy

19-May-06

27-Aug-06

12-Oct-06

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

0

10

20

30

40

50

Alpha

19-May-

06

27-Aug-0

6

12-Oct

-06

14-Apr-0

7

30-May-

07

24-Aug-0

8

9-Oct

-08

24-Nov-

08

2-Dec-

08

19-Apr-0

9

27-Aug-0

9

12-Oct

-09

0.3

0.4

0.5

0.6

0.7

0.8

Anisotropy

Area 1 Area 2

27-A

ug-0

6

24-A

ug-0

8

27-A

ug-0

9

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-2Test Site

1km

©MDA

Rice field

RADARSAT-2

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

Data

RADARSAT-2 　　

3km

3km

29JUN09 23JUL09 　　

16AUG09 9SEP09 　　

　　

　　 R:Double BounceG:VolumeB:Surface

　　

Three Component Decomposition

RADARSAT-2Three Component Decomposition

1km

©MDA

29-Jun-0

9

23-Jul-09

16-Au

g-09

9-Sep-09

0%

20%

40%

60%

80%

100%

Surface

Volume

Double bounce

Three Component Decomposition

1km

©MDA

Surface Volume

RADARSAT-2ALOS PALSAR

Double bounce

Dominant scattering component on grain filling season

Double bounce scattering Volume scattering

Entropy Alpha

Anisotropy

0.7

0.6

0.5

0.4

50

40

30

20

0.7

0.6

0.5

0.4

29Jun-09

RADARSAT-2H-a-A decomposition

23-Jul-0

9

16-Aug-09

9-Sep-09

29Jun-09

23-Jul-0

9

16-Aug-09

9-Sep-09

29Jun-09

23-Jul-0

9

16-Aug-09

9-Sep-09

Alpha

Anisotropy

50

40

30

20

0.7

0.6

0.5

0.4

H-a-A decomposition

23-Jul-0

9

16-Aug-09

9-Sep-09

23-Jul-0

9

16-Aug-09

9-Sep-09

RADARSAT-2ALOS PALSAR

20

30

40

50

0.4

0.5

0.6

0.7

Alpha

Anisotropy

29Jun-09

29Jun-09

RADARSAT-2

1km

©MDA

★Three component decomposition: Volume scattering component ratio – Useful to estimate rice growing process

★H-a-A decomposition: Alpha angle – Increasing with growth

Summary

★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

◆PALSAR(L-band) and RADARSAT-2(C-band) 　　　　⇒ rice grain filling season