POLARIMETRIC IMPLICATIONS OF INCIDENCE ANGLE VARIABILITY FOR UAVSAR

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POLARIMETRIC IMPLICATIONS OF INCIDENCE ANGLE VARIABILITY FOR UAVSAR

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

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