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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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2011_0728_IGARSS2011_Motohka.ppt

  • 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)
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8. Deciduous broadleaf forest (Tomakomai, Hokkaido) Evergreen coniferous forest (Otanomousu-daira, Nagano) Deciduous broadleaf forest (Chichibu, Saitama) Evergreen broadleaf forest (Yona, Okinawa)
  • 9.  
  • 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.
  • 23.