2011_0728_IGARSS2011_Motohka.ppt

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Relationships between PALSAR backscattering data and forest above ground biomass in Japan ○ Takeshi Motohka (Japan Aerospace Exploration Agency) 2011/07/28: IGARSS 2011, Vancouver, Canada. Masanobu Shimada (Japan Aerospace Exploration Agency) Osamu Isoguchi (Remote Sensing Technology Center of Japan) Masae I. Ishihara (Japan Wildlife Research Center) Satoshi N. Suzuki (Japan Wildlife Research Center)

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Background ,[object Object],[object Object],[object Object],[object Object],A large-scale, time-series, globally consistent biomass monitoring is important for various projects such as REDD+.

Biomass monitoring by PALSAR ,[object Object],[object Object],[object Object],[object Object],Phased Array type L-band Synthetic Aperture Radar PALSAR PALSAR-2 ALOS ALOS-2

Lucas et al ., 2011 Mitchard et al ., 2009 Englhart et al ., 2011 ,[object Object],Africa Australia Indonesia

Purpose of the study ,[object Object],[object Object],[object Object]

In situ Biomass Data Website: 　 http://www.biodic.go.jp/moni1000/ “ Monitoring Site 1000” project 　 by the Ministry of Environment of Japan (since 2003) ,[object Object],[object Object],[object Object],[object Object]

Deciduous broadleaf forest (Tomakomai, Hokkaido) Evergreen coniferous forest (Otanomousu-daira, Nagano) Deciduous broadleaf forest (Chichibu, Saitama) Evergreen broadleaf forest (Yona, Okinawa)

Tree diameter of breast height [cm] (DBH) Dry weight 　 [kg] measured all trees in about 1 ha plot except for DBH < about 5 cm. Allometric equations for each specie Ʃ (dry weight) / stand-size Biomass [t/ha] Processing of tree census data

Statistics of the forest stands (n=44) DBH: Diameter at Breast Height

PALSAR yearly mosaic R: HH G: HV B: HH/HV Year: 2007, 2009 Mode ：　 Fine beam dual (HH, HV) Mosaicking period ：　 Jun. - Sep. Pixel sampling ：　 10 m Orbit: Ascending

[object Object],[object Object],[object Object],[object Object],γ 0 [dB] = 10 log 〈 DN 2 〉 - 83 15 x 15 pixels averaging Shimada & Otaki (2011); Shimada (2011) in “ IEEE JSTAR special issue on Kyoto and Carbon Initiative” Generation of PALSAR yearly mosaics Converting DN to gamma naught

Saturation level : - dy/dx = 0.01 … 91 [t/ha] - dy/dx = 0.005 … 182 [t/ha] HV RMSE : 0.703 [dB] PALSAR γ 0 vs. biomass

Saturation level : - dy/dx = 0.01 … 68 [t/ha] - dy/dx = 0.005 … 136 [t/ha] PALSAR γ 0 vs. biomass RMSE : 1.053 [dB] HH

Red ●: After correction 　　 Green +: Before correction RMSE : 1.053 [dB] RMSE 0.703 [dB] RMSE : 2.312 [dB] RMSE 2.073 [dB] Effect of slope-correction

HV HH Precipitation vs. PALSAR gamma naught rainfall (over 10mm during 3 days before obs.) RMSE: HH : 0.670 dB HV : 0.402 dB Mean bias between rainy and non-rainy data: HH : +0.177 dB HV : +0.044 dB

Inversion of forest biomass 　 RMSE: 　 106.23 t/ha 　 %RMSE: 　 39.3 % 　　 (=RMSE/mean ) PALSAR HV γ 0 (15 x 15 pix average) Water, Lay-over, Shadowing mask Urban area mask Biomass map

400 ～ 0 100 200 300 Above ground biomass (t/ha)

Cropland Cropland Wetland 400 ～ 0 100 200 300 Above ground biomass (t/ha)

1 km (c) Google Earth 400 ～ 0 100 200 300 Above ground biomass (t/ha)

Summary ,[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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1. Relationships between PALSAR backscattering data and forest above ground biomass in Japan ○ Takeshi Motohka (Japan Aerospace Exploration Agency) 2011/07/28: IGARSS 2011, Vancouver, Canada. Masanobu Shimada (Japan Aerospace Exploration Agency) Osamu Isoguchi (Remote Sensing Technology Center of Japan) Masae I. Ishihara (Japan Wildlife Research Center) Satoshi N. Suzuki (Japan Wildlife Research Center)

8. Deciduous broadleaf forest (Tomakomai, Hokkaido) Evergreen coniferous forest (Otanomousu-daira, Nagano) Deciduous broadleaf forest (Chichibu, Saitama) Evergreen broadleaf forest (Yona, Okinawa)

10. Tree diameter of breast height [cm] (DBH) Dry weight 　 [kg] measured all trees in about 1 ha plot except for DBH < about 5 cm. Allometric equations for each specie Ʃ (dry weight) / stand-size Biomass [t/ha] Processing of tree census data

11. Statistics of the forest stands (n=44) DBH: Diameter at Breast Height

12. PALSAR yearly mosaic R: HH G: HV B: HH/HV Year: 2007, 2009 Mode ：　 Fine beam dual (HH, HV) Mosaicking period ：　 Jun. - Sep. Pixel sampling ：　 10 m Orbit: Ascending

13.

14. Saturation level : - dy/dx = 0.01 … 91 [t/ha] - dy/dx = 0.005 … 182 [t/ha] HV RMSE : 0.703 [dB] PALSAR γ 0 vs. biomass

15. Saturation level : - dy/dx = 0.01 … 68 [t/ha] - dy/dx = 0.005 … 136 [t/ha] PALSAR γ 0 vs. biomass RMSE : 1.053 [dB] HH

16. Red ●: After correction 　　 Green +: Before correction RMSE : 1.053 [dB] RMSE 0.703 [dB] RMSE : 2.312 [dB] RMSE 2.073 [dB] Effect of slope-correction

17. HV HH Precipitation vs. PALSAR gamma naught rainfall (over 10mm during 3 days before obs.) RMSE: HH : 0.670 dB HV : 0.402 dB Mean bias between rainy and non-rainy data: HH : +0.177 dB HV : +0.044 dB

18. Inversion of forest biomass 　 RMSE: 　 106.23 t/ha 　 %RMSE: 　 39.3 % 　　 (=RMSE/mean ) PALSAR HV γ 0 (15 x 15 pix average) Water, Lay-over, Shadowing mask Urban area mask Biomass map

19. 400 ～ 0 100 200 300 Above ground biomass (t/ha)

20. Cropland Cropland Wetland 400 ～ 0 100 200 300 Above ground biomass (t/ha)

21. 1 km (c) Google Earth 400 ～ 0 100 200 300 Above ground biomass (t/ha)

22.

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2011_0728_IGARSS2011_Motohka.ppt