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  1. 1. A coherent backscattering model for growing corn<br />Alejandro Monsivais-Huertero(1) and Jasmeet Judge(2)<br />(1)ESIME Ticoman, InstitutoPolitecnicoNacional, Mexico<br />(2)Center for RemoteSensing, University of Florida, USA<br />
  2. 2. 7/25/11<br />IGARSS 2011. Vancouver, Canada.<br />Outline<br /><ul><li>Introduction
  3. 3. Methodology
  4. 4. Results
  5. 5. Conclusion and future work</li></li></ul><li>Introduction<br />VSM is important for:<br />ET <br />Infiltration <br />Groundwater recharge <br />Crop growth and yield<br />7/25/11<br />IGARSS 2011. Vancouver, Canada.<br />
  6. 6. Introduction<br />7/25/11<br />Soil moisture information<br />Active satellite missions<br />VSM<br />IGARSS 2011. Vancouver, Canada.<br />
  7. 7. Introduction<br />7/25/11<br />Dynamic vegetation<br />IGARSS 2011. Vancouver, Canada.<br />
  8. 8. 7/25/11<br />Introduction<br />Monsivais-Huertero & Judge, 2011. Random generation, discrete representation<br />Incoherent model<br /> (MIMICS)<br />Coherent model<br /> (Born approximation)<br />Vs<br />IGARSS 2011. Vancouver, Canada.<br />
  9. 9. Introduction<br />7/25/11<br />Monsivais-Huertero & Judge, 2011. Random generation, discrete representation<br />Incoherent model<br /> (MIMICS)<br />Coherent model<br /> (Born approximation)<br />Vs<br />IGARSS 2011. Vancouver, Canada.<br />
  10. 10. Introduction<br />7/25/11<br />Monsivais-Huertero & Judge, 2011. Random generation, discrete representation<br />Incoherent model<br /> (MIMICS)<br />Coherent model<br /> (Born approximation)<br />Vs<br /><ul><li>Coherent model shows higher double scattering contribution
  11. 11. Coherent model predicts higher sensitivity to soil moisture than MIMICS model</li></ul>IGARSS 2011. Vancouver, Canada.<br />
  12. 12. Motivation<br />Objectives<br /><ul><li>To compare incoherent and coherent formulations to estimate backscatter from growing corn
  13. 13. To understand the coherent effects due to rows and location of canonical elements</li></ul>7/25/11<br />IGARSS 2011. Vancouver, Canada.<br />
  14. 14. Methodology<br />7/25/11<br />Leaf location<br />Ear location<br />Leaf location<br />Leaf location<br />Canonical elements<br />Stems Cylinders<br />Leaves Ellipsoids<br />Ears Cylinders<br />Rough surface<br />Row space<br />IGARSS 2011. Vancouver, Canada.<br />
  15. 15. Eighth Microwave Water and Energy Balance Experiment (MicroWEX-8)<br />Series of season-long experiments conducted at a 9-acre field in NC Florida.<br />MicroWEX-8: growing season of sweet corn from June 16 through August 24, 2009 <br />Soil moisture and temperature values were observed every 15 minutes at the depths of 2, 4, 8, 16, 32, 64, and 120cm.<br />V- & H-pol. TB at C-band and H-pol. TB at L-band every 15 minutes.<br />Intensive Observation Period (IOP) 3 days in August, 2009<br />A risk-reduction experiment for the NASA-THP project<br /><ul><li>Concurrent active and passive, along w/ Lidar observations</li></ul>7/25/11<br />IGARSS 2011. Vancouver, Canada.<br />
  16. 16. MicroWEX-8 contd.<br />Radiometer<br />Radar<br />Lidar<br />
  17. 17. MicroWEX-8 (Veg. description)<br />Rep.<br />Rep.<br />Early<br />Mid<br />Late<br />Early<br />Mid<br />Late<br />Length (m)<br />H (m)<br />Density (plants/m2)<br />Width (m)<br />Biomass (kg/m2)<br />DoY (EST) 2009<br />*Bongiovanni, T.,, et al. (2011). Field observations during the eighth microwavewater and energy balance experiment (MicroWEX-8), University ofFlorida, available at UF/IFAS EDIS website,http://edis.ifas.ufl.edu/ae476<br />DoY (EST) 2009<br />
  18. 18. MicroWEX-8 (soil description)<br />7/25/11<br />Surface roughness measurements<br />Near-surface soil moisture<br />IGARSS 2011. Vancouver, Canada.<br />
  19. 19. Results<br />MIMICS model estimates the lowest s0vv among the three models and similar level for s0hh<br />Both the modified generator and the random generator show similar trends at both co-pols.<br />At VV-pol, the modified generator gives amplitudes 2 dB higher than the random generator all over the growing season, in contrast, at HH-pol, both generators provide similar amplitudes after the late season. <br />Rep.<br />Early<br />Mid<br />Late<br />s0vv (dB)<br />s0hh (dB)<br />DoY (EST) 2009<br />
  20. 20. Results (contd)<br /><ul><li>For both models, the main scat. mechanism is the double scatt.
  21. 21. At vv-pol: s0dir for both models has similar level, s0doub is 2 dB higher in the mod. generator, s0soil is 5 dB higher at the mod. generator.
  22. 22. At hh-pol, both s0dir and s0doub have similar level, in contrast, s0soil is 3 dB lower in mod. generator.</li></ul>Rep.<br />Rep.<br />Early<br />Mid<br />Late<br />Early<br />Mid<br />Late<br />s0vv (dB)<br />s0hh (dB)<br />DoY (EST) 2009<br />DoY (EST) 2009<br />
  23. 23. Results (contd)<br /><ul><li>Restriction in the stem, leaf and ear location increases the double scattering and the attenuation due to veg. cover at hh-pol, but reduces the attention at vv-pol.</li></ul>Rep.<br />Rep.<br />Early<br />Mid<br />Late<br />Early<br />Mid<br />Late<br />s0vv (dB)<br />s0hh (dB)<br />DoY (EST) 2009<br />DoY (EST) 2009<br />
  24. 24. Conclusions<br />Inclusion of row structure and restriction of leaf and ear location produces higher double scattering up to 2 dB in VV-pol. <br />Differences at VV-pol are more significant after mid season due to increments in the double scattering.<br />Future work: Model evaluation with field observations<br />7/25/11<br />IGARSS 2011. Vancouver, Canada.<br />
  25. 25. MicroWEX-10<br />UF – L band Automated Scatterometer System<br />UF-LASS <br /><ul><li>RF electronics and antenna: Roger DeRoo & Ruzbeh Akbar @ U. Michigan
  26. 26. Controls and mechanics: UF
  27. 27. Provide diurnal observations w/ high temporal frequency</li></li></ul><li>Thank you for your attention<br />amonsivais@ipn.mx<br />monsivais@ufl.edu<br />7/25/11<br />20<br />IGARSS 2011. Vancouver, Canada.<br />