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Rick Guritz IGARSS Meeting, July 28 2011 1 Rick Guritz, Don Atwood 1 Bruce Chapman, and Scott Hensley 2 1)Alaska Satellite Facility 2)NASA Jet Propulsion.

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Presentation on theme: "Rick Guritz IGARSS Meeting, July 28 2011 1 Rick Guritz, Don Atwood 1 Bruce Chapman, and Scott Hensley 2 1)Alaska Satellite Facility 2)NASA Jet Propulsion."— Presentation transcript:

1 Rick Guritz IGARSS Meeting, July 28 2011 1 Rick Guritz, Don Atwood 1 Bruce Chapman, and Scott Hensley 2 1)Alaska Satellite Facility 2)NASA Jet Propulsion Laboratory POLARIMETRIC IMPLICATIONS OF INCIDENCE ANGLE VARIABILITY FOR UAVSAR

2 Rick Guritz IGARSS Meeting, July 28 2011 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 Rick Guritz IGARSS Meeting, July 28 2011 3 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 UAVSAR

4 Rick Guritz IGARSS Meeting, July 28 2011 4 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 UAVSAR

5 Rick Guritz IGARSS Meeting, July 28 2011 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 Rick Guritz IGARSS Meeting, July 28 2011 6 Presentation Overview Introduce Project Study Area Show ellipsoidal and local incidence angle ranges Introduce statistical method for investigating scattering mechanisms Characterize impact of incidence angle on scattering mechanisms Analyze trends

7 Rick Guritz IGARSS Meeting, July 28 2011 7 Land Cover Classification of Yellowstone ylwstn_26903_10067 Aug 10, 2010

8 Rick Guritz IGARSS Meeting, July 28 2011 8 Ellipsoidal Incidence Angle Ranges from 12 to 64 degrees Incidence Angle Variability 70 degrees 0 degrees

9 Rick Guritz IGARSS Meeting, July 28 2011 9 Hillshade DEM Incidence Angle Variability

10 Rick Guritz IGARSS Meeting, July 28 2011 10 Local Incidence Angle Incidence Angle Variability 90 degrees 0 degrees

11 Rick Guritz IGARSS Meeting, July 28 2011 11 Segmentation of Local Incidence Angle Incidence Angle Variability

12 Rick Guritz IGARSS Meeting, July 28 2011 12 Reference Data USGS NLCD 2006

13 Rick Guritz IGARSS Meeting, July 28 2011 13 Use PolSARpro and GIS to create a statistical characterization of polarimetric scattering for individual land cover classes Use to: Investigate the physics of scattering for specific classes Explore impact of varying the local incidence angle Statistical Analysis of Scattering Mechanisms Surface Double Bounce Volume

14 Rick Guritz IGARSS Meeting, July 28 2011 14 3x3 Multilooked C3 VanZyl DecompositionConvert to GeoTIFF POA compensation Compute Class PDFs in GIS Polarimetric Processing

15 Rick Guritz IGARSS Meeting, July 28 2011 15 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

16 Rick Guritz IGARSS Meeting, July 28 2011 16 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

17 Rick Guritz IGARSS Meeting, July 28 2011 17 VanZyl Decomposition (all Incidence Angles) Surface Double Bounce Volume

18 Rick Guritz IGARSS Meeting, July 28 2011 18 Pixel Count per Incidence Angle

19 Rick Guritz IGARSS Meeting, July 28 2011 19 Incidence Angle Analysis Surface Double Bounce Volume

20 Rick Guritz IGARSS Meeting, July 28 2011 20 Incidence Angle Analysis Surface Double Bounce Volume

21 Rick Guritz IGARSS Meeting, July 28 2011 21 Incidence Angle Analysis Surface Double Bounce Volume

22 Rick Guritz IGARSS Meeting, July 28 2011 22 Incidence Angle Analysis Surface Double Bounce Volume

23 Rick Guritz IGARSS Meeting, July 28 2011 23 Incidence Angle Analysis Surface Double Bounce Volume

24 Rick Guritz IGARSS Meeting, July 28 2011 24 Incidence Angle Analysis Surface Double Bounce Volume

25 Rick Guritz IGARSS Meeting, July 28 2011 25 Trend Analysis Surface Double Bounce Volume

26 Rick Guritz IGARSS Meeting, July 28 2011 26 Class: Evergreen Surface Double Bounce Volume

27 Rick Guritz IGARSS Meeting, July 28 2011 27 Class: Woody Wetlands Surface Double Bounce Volume

28 Rick Guritz IGARSS Meeting, July 28 2011 28 Class: Shrub/Scrub Surface Double Bounce Volume

29 Rick Guritz IGARSS Meeting, July 28 2011 29 Class: Herb/Grassland Surface Double Bounce Volume

30 Rick Guritz IGARSS Meeting, July 28 2011 30 Class: Emergent Herb Wetlands Surface Double Bounce Volume

31 Rick Guritz IGARSS Meeting, July 28 2011 31 Class: Barren Ground Surface Double Bounce Volume

32 Rick Guritz IGARSS Meeting, July 28 2011 32 Comparison: Scattering power of surface scattering drops off as function of angle Corresponding growth of volume and double bounce Barren ground exhibits strong specular reflection effect Comparison: Barren Ground vs Evergreen Forest Surface Double Bounce Volume Surface Double Bounce Volume

33 Rick Guritz IGARSS Meeting, July 28 2011 33 Comparison: Herb Wetlands vs Woody Wetlands Comparison: Herb wetlands and woody wetlands differ in magnitude of surface scattering Herb wetland exhibits rapid fall-off of surface scattering, similar to barren ground Surface Double Bounce Volume Surface Double Bounce Volume

34 Rick Guritz IGARSS Meeting, July 28 2011 34 Comparison: Herb/Grassland vs Shrub/Scrub Comparison: Trends for Herb/Grassland and Shrub/Scrub are remarkably similar making it hard to distinguish these two vegetation classes Surface Double Bounce Volume Surface Double Bounce Volume

35 Rick Guritz IGARSS Meeting, July 28 2011 35 Summary Introduced methodology for characterizing scattering mechanisms using VanZyl decomposition VanZyl scattering mechanism vary strongly as a function of local incidence angle for all classes Trend across classes included diminishing surface scattering and increasing volume and double bounce scattering as incidence angle increases This effect is most pronounced for smooth surfaced (e.g. barren ground and emergent wetlands)

36 Rick Guritz IGARSS Meeting, July 28 2011 36 Questions? Rick Guritz rmguritz@alaska.edu (907) 474-7886 Photo Credit: Don Atwood

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