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    IGARSS2011_Koyama_Schneider.pptx IGARSS2011_Koyama_Schneider.pptx Presentation Transcript

    • Soil Moisture Retrieval Under Vegetation Using Dual Polarized PALSAR Data
      Christian Koyama & Karl Schneider
      Department of Geosciences
      University of Cologne
      IGARSS 2011 Vancouver
      July 26, 2011
    • Outline
      • Test Site & Field Measurements
      • ALOS PALSAR Data & Processing
      • Grassland Soil Moisture Retrieval Model
      • High Resolution Surface Soil Moisture Patterns
      • Conclusions
      Table of Contents
      - 02 -
    • Grass layer
      Layer depth: 5 – 175 cm
      Dielectric constant: 15 – 25
      Blade density: 1000 – 3000/m²
      Grass biomass: 0.2 – 3.1 kg/m²
      Thatch layer
      Layer depth: 2 – 4 cm
      Dielectric constant: 6 – 70
      Soil half space
      Dielectric constant: 9.7 – 33.8
      Texture: clay/silt loam
      Ground Truth Data
      (test site and field measurements)
      - 03 -
    • PALSAR Fine Mode Dual Polarization Data
      Region: Track 647+648 / Frame 1000+1010
      Ground Range Resolution: 15 m
      Center Frequency: L-band @ 1,270 MHz
      Chirp Bandwidth: 14 MHz
      Polarization: HH + HV
      Off-Nadir Angle: 34.3 deg.
      8/2/2007
      9/17/2007
      5/4/2008
      6/2/2008
      6/19/2008
      7/18/2008
      6/22/2009
      7/21/2009
      9/5/2009
      9/22/2009
      5/10/2010
      6/25/2010
      10/21/2009
      Track 647
      Track 648
      Soil moisture
      Surface roughness
      Biomass
      Jan.
      Feb.
      Mar.
      Apr.
      May
      June
      July
      Aug.
      Sep.
      Oct.
      Nov.
      Dec.
      Aug.
      Sep.
      Oct.
      Nov.
      Dec.
      Jan.
      Feb.
      Mar.
      Apr.
      May
      June
      July
      Aug.
      Sep.
      Oct.
      Nov.
      Dec.
      Jan.
      Feb.
      Mar.
      Apr.
      May
      June
      2010
      2007
      2008
      2009
      ALOS PALSAR FBD343 DATA
      (product description & acquisition overview)
      - 04 -
    • ALOS PALSAR FBD343 Level 1.1
      Multi-looking
      [C2] Matrix Elements Processing
      HH Power Image
      σ0HH
      HV Power Image
      σ0HV
      Multi-Looking
      Covariance [C2] Matrix Elements
      Coregistration + Generic Filtering
      H
      A
      alpha
      span
      Terrain Geocoding
      H/A/Alpha Decomposition
      Radiometric Calibration
      Geocoding
      Simplified Processing Chain
      (basicprocessingand polarimetric decompositionof FBD343)
      - 05 -
    • 2008-06-02
      2008-07-18
      2009-07-21
      200
      400
      0
      Meters
      Christian N. Koyama
      University of Cologne
      IGARSS 2011
      Vancouver, July 26
      Dual-pol α/H/span-HSV
      (H = alpha / S = entropy / V = span)
    • Grass canopy
      Thatch
      Matrix soil
      Thatch Layer Effect
      - 7 -
    • 2009-07-21
      2008-05-04
      2007-09-17
      2008-06-02
      mv = 51.1
      SD = 4.2
      mv = 34.5
      SD = 3.4
      mv = 48.7
      SD = 4.9
      mv = 37.9
      SD = 4.4
      Alpha [deg.]
      Alpha [deg.]
      Alpha [deg.]
      Alpha [deg.]
      Entropy
      Entropy
      Entropy
      Entropy
      Cloude, S.R. (2007): “The Dual Polarisation Entropy/Alpha Decomposition: A PALSAR Case Study, “ In Proceedings of PolInSAR 2007.
      Grassland H2αPlanes
      - 8 -
    • Empirical Grassland Parameter Model
      - 9 -
    • Grassland Soil Moisture Estimation
      - 10 -
    • 2007-08-02
      2007-09-17
      Christian N. Koyama
      University of Cologne
      IGARSS 2011
      Vancouver, July 26
      25
      75
      Surface Soil Moisture Distribution
      mv [Vol.-%]
    • Conclusions
      • L-band dual-pol SAR has the potential to correct for disturbing effects occurring in grassland ecosystems without the use of a priori knowledge
      • The retrieval algorithm is suitable to account for varying effects of vegetation and thatch
      • The thatch layer is the major source of attenuation
      • At L-band the amount of above ground grass biomass and its geometric properties can be neglected if <2 kg/m²
      Conclusions
      - 12 -
    • Thank you for your attention.
      Acknowledgements
      The authors thank the Japan Aerospace Exploration Agency (JAXA) and the European Space Agency (ESA) for the provision of ALOS PALSAR
      data through their PI programme (AOALO.3570).
      Financial support by the SFB/TR32 "Patterns in Soil-Vegetation-Atmosphere Systems" funded by the German Research Foundation (DFG) is gratefully acknowledged.
      christian.koyama@uni-koeln.de
      www.tr32.de
      - 13 -
    • 2009-07-21
      2009-07-21
      2009-07-21
      200
      400
      0
      Meters
      Christian N. Koyama
      University of Cologne
      IGARSS 2011
      Vancouver, July 26
      Dual-pol Pauli-RGB
      (R = C22 /G = C11-2xC12r+C22 /B = C11)
    • 2008-05-04
      2008-06-02
      2008-06-19
      Christian N. Koyama
      University of Cologne
      IGARSS 2011
      Vancouver, July 26
      25
      75
      Surface Soil Moisture Distribution
      mv [Vol.-%]
    • 16
    • 17
    • 18
    • 19
    • 20
    • 21
    • 22
    • 23