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IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
IGARSS2011_Koyama_Schneider.pptx
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IGARSS2011_Koyama_Schneider.pptx

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  • 1. Soil Moisture Retrieval Under Vegetation Using Dual Polarized PALSAR Data<br />Christian Koyama & Karl Schneider<br />Department of Geosciences<br />University of Cologne<br />IGARSS 2011 Vancouver<br />July 26, 2011<br />
  • 2. Outline<br /><ul><li>Test Site & Field Measurements
  • 3. ALOS PALSAR Data & Processing
  • 4. Grassland Soil Moisture Retrieval Model
  • 5. High Resolution Surface Soil Moisture Patterns
  • 6. Conclusions</li></ul>Table of Contents<br />- 02 -<br />
  • 7. Grass layer<br />Layer depth: 5 – 175 cm<br />Dielectric constant: 15 – 25 <br />Blade density: 1000 – 3000/m²<br />Grass biomass: 0.2 – 3.1 kg/m²<br />Thatch layer<br />Layer depth: 2 – 4 cm<br />Dielectric constant: 6 – 70<br />Soil half space<br />Dielectric constant: 9.7 – 33.8<br />Texture: clay/silt loam<br />Ground Truth Data<br />(test site and field measurements)<br />- 03 -<br />
  • 8. PALSAR Fine Mode Dual Polarization Data<br />Region: Track 647+648 / Frame 1000+1010<br />Ground Range Resolution: 15 m<br />Center Frequency: L-band @ 1,270 MHz<br />Chirp Bandwidth: 14 MHz<br />Polarization: HH + HV<br />Off-Nadir Angle: 34.3 deg.<br />8/2/2007<br />9/17/2007<br />5/4/2008<br />6/2/2008<br />6/19/2008<br />7/18/2008<br />6/22/2009<br />7/21/2009<br />9/5/2009<br />9/22/2009<br />5/10/2010<br />6/25/2010<br />10/21/2009<br />Track 647<br />Track 648<br />Soil moisture<br />Surface roughness<br />Biomass<br />Jan.<br />Feb.<br />Mar.<br />Apr.<br />May<br />June<br />July<br />Aug.<br />Sep.<br />Oct.<br />Nov.<br />Dec.<br />Aug.<br />Sep.<br />Oct.<br />Nov.<br />Dec.<br />Jan.<br />Feb.<br />Mar.<br />Apr.<br />May<br />June<br />July<br />Aug.<br />Sep.<br />Oct.<br />Nov.<br />Dec.<br />Jan.<br />Feb.<br />Mar.<br />Apr.<br />May<br />June<br />2010<br />2007<br />2008<br />2009<br />ALOS PALSAR FBD343 DATA<br />(product description & acquisition overview)<br />- 04 -<br />
  • 9. ALOS PALSAR FBD343 Level 1.1<br />Multi-looking<br />[C2] Matrix Elements Processing<br />HH Power Image<br />σ0HH<br />HV Power Image<br />σ0HV<br />Multi-Looking<br />Covariance [C2] Matrix Elements<br />Coregistration + Generic Filtering<br />H<br />A<br />alpha<br />span<br />Terrain Geocoding<br />H/A/Alpha Decomposition<br />Radiometric Calibration<br />Geocoding<br />Simplified Processing Chain<br />(basicprocessingand polarimetric decompositionof FBD343)<br />- 05 -<br />
  • 10. 2008-06-02<br />2008-07-18<br />2009-07-21<br />200<br />400<br />0<br />Meters<br />Christian N. Koyama<br />University of Cologne<br />IGARSS 2011<br />Vancouver, July 26<br />Dual-pol α/H/span-HSV<br />(H = alpha / S = entropy / V = span)<br />
  • 11. Grass canopy<br />Thatch<br />Matrix soil<br />Thatch Layer Effect<br />- 7 -<br />
  • 12. 2009-07-21<br />2008-05-04<br />2007-09-17<br />2008-06-02<br />mv = 51.1 <br />SD = 4.2<br />mv = 34.5 <br />SD = 3.4<br />mv = 48.7 <br />SD = 4.9<br />mv = 37.9 <br />SD = 4.4<br />Alpha [deg.]<br />Alpha [deg.]<br />Alpha [deg.]<br />Alpha [deg.]<br />Entropy<br />Entropy<br />Entropy<br />Entropy<br />Cloude, S.R. (2007): “The Dual Polarisation Entropy/Alpha Decomposition: A PALSAR Case Study, “ In Proceedings of PolInSAR 2007.<br />Grassland H2αPlanes<br />- 8 -<br />
  • 13. Empirical Grassland Parameter Model<br />- 9 -<br />
  • 14. Grassland Soil Moisture Estimation<br />- 10 -<br />
  • 15. 2007-08-02<br />2007-09-17<br />Christian N. Koyama<br />University of Cologne<br />IGARSS 2011<br />Vancouver, July 26<br />25<br />75<br />Surface Soil Moisture Distribution<br />mv [Vol.-%]<br />
  • 16. Conclusions<br /><ul><li>L-band dual-pol SAR has the potential to correct for disturbing effects occurring in grassland ecosystems without the use of a priori knowledge
  • 17. The retrieval algorithm is suitable to account for varying effects of vegetation and thatch
  • 18. The thatch layer is the major source of attenuation
  • 19. At L-band the amount of above ground grass biomass and its geometric properties can be neglected if <2 kg/m²</li></ul>Conclusions<br />- 12 -<br />
  • 20. Thank you for your attention.<br />Acknowledgements <br />The authors thank the Japan Aerospace Exploration Agency (JAXA) and the European Space Agency (ESA) for the provision of ALOS PALSAR<br /> data through their PI programme (AOALO.3570). <br />Financial support by the SFB/TR32 "Patterns in Soil-Vegetation-Atmosphere Systems" funded by the German Research Foundation (DFG) is gratefully acknowledged. <br />christian.koyama@uni-koeln.de<br />www.tr32.de<br />- 13 -<br />
  • 21. 2009-07-21<br />2009-07-21<br />2009-07-21<br />200<br />400<br />0<br />Meters<br />Christian N. Koyama<br />University of Cologne<br />IGARSS 2011<br />Vancouver, July 26<br />Dual-pol Pauli-RGB<br />(R = C22 /G = C11-2xC12r+C22 /B = C11)<br />
  • 22. 2008-05-04<br />2008-06-02<br />2008-06-19<br />Christian N. Koyama<br />University of Cologne<br />IGARSS 2011<br />Vancouver, July 26<br />25<br />75<br />Surface Soil Moisture Distribution<br />mv [Vol.-%]<br />
  • 23. 16<br />
  • 24. 17<br />
  • 25. 18<br />
  • 26. 19<br />
  • 27. 20<br />
  • 28. 21<br />
  • 29. 22<br />
  • 30. 23<br />

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