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POLARIMETRIC IMPLICATIONS OF INCIDENCE ANGLE VARIABILITY FOR UAVSAR
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POLARIMETRIC IMPLICATIONS OF INCIDENCE ANGLE VARIABILITY FOR UAVSAR

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  • 1. POLARIMETRIC IMPLICATIONS OF INCIDENCE ANGLE VARIABILITY FOR UAVSAR
    Rick Guritz, Don Atwood1
    Bruce Chapman, and Scott Hensley2
    Alaska Satellite Facility
    NASA Jet Propulsion Laboratory
  • 2. UAVSAR
    The UAVSAR L-band radar is housed in a pod flown on the NASA G-3 platform, shown here in flight over Edwards Air Force Base, California.
  • 3. UAVSAR
    NASA Jet Propulsion Lab’s UAVSAR Instrument
    Reconfigurable L-band, quad-polarimetric SAR
    Developed specifically for repeat track differential interferometry
    Designed to be flown aboard a UAV (Uninhabited Aerial Vehicle)
    Currently being flown aboard a Gulfstream III
    Mission-based data acquisition
  • 4. UAVSAR
    NASA Jet Propulsion Lab’s UAVSAR Instrument
    Reconfigurable L-band, quad-polarimetric SAR
    Developed specifically for repeat track differential interferometry
    Designed to be flown aboard a UAV (Uninhabited Aerial Vehicle)
    Currently being flown aboard a Gulfstream III
    Mission-based data acquisition
    Lacks coverage of spaceborne SAR, but offers higher resolution and better noise floor. Great data for PolSAR research.
    However airborne platform presents broad range of look angles, possibly making classification more challenging
  • 5. Motivation
    Investigate the affects of incidence angle variation on polarimetric scattering mechanisms
    As noted by Dr. Lee in his summary talk Tuesday
    Ideal Radiometric Terrain Correction will require knowledge of terrain type – No current RTC algorithms address this
    Assess possible implications for polarimetric classification
  • 6. Presentation Overview
    • Introduce Project Study Area
    • 7. Show ellipsoidal and local incidence angle ranges
    • 8. Introduce statistical method for investigating scattering mechanisms
    • 9. Characterize impact of incidence angle on scattering mechanisms
    • 10. Analyze trends
  • Land Cover Classification
    of Yellowstone
    ylwstn_26903_10067
    Aug 10, 2010
  • 11. Incidence Angle Variability
    70 degrees
    0 degrees
    Ellipsoidal Incidence Angle
    Ranges from 12 to 64 degrees
  • 12. Incidence Angle Variability
    Hillshade DEM
  • 13. Incidence Angle Variability
    90 degrees
    0 degrees
    Local Incidence Angle
  • 14. Incidence Angle Variability
    Segmentation of Local Incidence Angle
  • 15. Reference Data
    USGS NLCD 2006
  • 16. Statistical Analysis of Scattering Mechanisms
    Use PolSARpro and GIS to create a statistical characterization of polarimetric scattering for individual land cover classes
    Surface
    Double Bounce
    Volume
    Use to:
    • Investigate the physics of scattering for specific classes
    • 17. Explore impact of varying the local incidence angle
  • Polarimetric Processing
    3x3 Multilooked C3 VanZyl Decomposition Convert to GeoTIFF
    POA compensation Compute Class PDFs
    in GIS
  • 18. Extracting Scattering Strengths from Land Cover
    GIS Procedure:
    • Normalize the polarimetric decomposition components
    (Surface, Double, Volume) for each resolution cell
    • Determine Probability Distribution Function of Scattering Strengths for each Land Cover Class
  • Extracting Scattering Strengths from Land Cover
    GIS Procedure:
    • Normalize the polarimetric decomposition components
    (Surface, Double, Volume) for each resolution cell
    • Determine Probability Distribution Function of Scattering Strength for each Land Cover Class
    Surface
    Double Bounce
    Volume
  • 19. VanZyl Decomposition
    (all Incidence Angles)
    Surface
    Double Bounce
    Volume
  • 20. Pixel Count per Incidence Angle
  • 21. Incidence Angle Analysis
    Surface
    Double Bounce
    Volume
  • 22. Incidence Angle Analysis
    Surface
    Double Bounce
    Volume
  • 23. Incidence Angle Analysis
    Surface
    Double Bounce
    Volume
  • 24. Incidence Angle Analysis
    Surface
    Double Bounce
    Volume
  • 25. Incidence Angle Analysis
    Surface
    Double Bounce
    Volume
  • 26. Incidence Angle Analysis
    Surface
    Double Bounce
    Volume
  • 27. Trend Analysis
    Surface
    Double Bounce
    Volume
  • 28. Class: Evergreen
    Surface
    Double Bounce
    Volume
  • 29. Class: Woody Wetlands
    Surface
    Double Bounce
    Volume
  • 30. Class: Shrub/Scrub
    Surface
    Double Bounce
    Volume
  • 31. Class: Herb/Grassland
    Surface
    Double Bounce
    Volume
  • 32. Class: Emergent Herb Wetlands
    Surface
    Double Bounce
    Volume
  • 33. Class: Barren Ground
    Surface
    Double Bounce
    Volume
  • 34. Comparison:
    Barren Ground vs Evergreen Forest
    Surface
    Double Bounce
    Volume
    Surface
    Double Bounce
    Volume
    Comparison:
    • Scattering power of surface scattering drops off as function of angle
    • 35. Corresponding growth of volume and double bounce
    • 36. Barren ground exhibits strong specular reflection effect
  • Comparison:
    Herb Wetlands vs Woody Wetlands
    Surface
    Double Bounce
    Volume
    Surface
    Double Bounce
    Volume
    Comparison:
    • Herb wetlands and woody wetlands differ in magnitude of surface scattering
    • 37. Herb wetland exhibits rapid fall-off of surface scattering, similar to barren ground
  • Comparison:
    Herb/Grassland vs Shrub/Scrub
    Surface
    Double Bounce
    Volume
    Surface
    Double Bounce
    Volume
    Comparison:
    • Trends for Herb/Grassland and Shrub/Scrub are remarkably similar making it hard to distinguish these two vegetation classes
  • Summary
    • Introduced methodology for characterizing scattering mechanisms using VanZyl decomposition
    • 38. VanZyl scattering mechanism vary strongly as a function of local incidence angle for all classes
    • 39. Trend across classes included diminishing surface scattering and increasing volume and double bounce scattering as incidence angle increases
    • 40. This effect is most pronounced for smooth surfaced (e.g. barren ground and emergent wetlands)
  • Questions?
    Rick Guritz
    rmguritz@alaska.edu
    (907) 474-7886
    Photo Credit: Don Atwood