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IGARSS2011Monsivais.pptx

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

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