Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 Soil Moisture Retrieval Under Vegetation Using Dual Polarized PALSAR Data Christian.

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Presentation transcript:

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 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

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 Outline Test Site & Field Measurements ALOS PALSAR Data & Processing Grassland Soil Moisture Retrieval Model High Resolution Surface Soil Moisture Patterns Conclusions T ABLE OF C ONTENTS

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 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 G ROUND T RUTH D ATA (test site and field measurements)

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 PALSAR Fine Mode Dual Polarization Data Region: Track / Frame Ground Range Resolution: 15 m Center Frequency: 1,270 MHz Chirp Bandwidth: 14 MHz Polarization: HH + HV Off-Nadir Angle: 34.3 deg Track 647 Track /21/2009 5/4/2008 6/2/2008 6/19/20087/18/20086/22/20097/21/2009 9/5/20099/22/20099/17/2007 8/2/2007 Soil moisture Surface roughness Biomass ALOS PALSAR FBD343 DATA (product description & acquisition overview) Jan. Feb. Mar. Apr. MayJune July Aug. Sep. Oct. Nov. Dec. Aug. Sep. Oct. Nov. Dec. Jan. Feb. Mar. Apr. MayJune July Aug. Sep. Oct. Nov. Dec. Jan. Feb. Mar. Apr. MayJune 5/10/2010 6/25/

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 ALOS PALSAR FBD343 Level 1.1 Multi-looking Coregistration + Generic Filtering Terrain Geocoding Radiometric Calibration [C2] Matrix Elements Processing Multi-Looking H/A/Alpha Decomposition Covariance [C2] Matrix Elements Geocoding S IMPLIFIED P ROCESSING C HAIN (basic processing and polarimetric decomposition of FBD343)

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July Meters Dual-pol α/H/span-HSV (H = alpha / S = entropy / V = span) Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 Thatch Matrix soil Grass canopy T HATCH L AYER E FFECT

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July Alpha [deg.] Entropy Alpha [deg.] Entropy m v = 37.9 SD = 4.4 m v = 34.5 SD = m v = 51.1 SD = 4.2 m v = 48.7 SD = G RASSLAND H2α P LANES Alpha [deg.] Entropy Alpha [deg.] Entropy Cloude, S.R. (2007): “The Dual Polarisation Entropy/Alpha Decomposition: A PALSAR Case Study, “ In Proceedings of PolInSAR 2007.

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July E MPIRICAL G RASSLAND P ARAMETER M ODEL

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July G RASSLAND S OIL M OISTURE E STIMATION

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 S URFACE S OIL M OISTURE D ISTRIBUTION 2575 m v [Vol.-%] Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 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 C ONCLUSIONS

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 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 N. Koyama University of Cologne IGARSS 2011 Vancouver, July Meters Dual-pol Pauli-RGB (R = C22 / G = C11-2xC12r+C22 / B = C11) Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26

Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 Christian N. Koyama University of Cologne IGARSS 2011 Vancouver, July 26 Surface Soil Moisture Distribution 2575 m v [Vol.-%]

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