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 transcript:

Rick Guritz IGARSS Meeting, July 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

Rick Guritz IGARSS Meeting, July 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.

Rick Guritz IGARSS Meeting, July 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

Rick Guritz IGARSS Meeting, July 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

Rick Guritz IGARSS Meeting, July 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

Rick Guritz IGARSS Meeting, July 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

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

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

Rick Guritz IGARSS Meeting, July Hillshade DEM Incidence Angle Variability

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

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

Rick Guritz IGARSS Meeting, July Reference Data USGS NLCD 2006

Rick Guritz IGARSS Meeting, July 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

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

Rick Guritz IGARSS Meeting, July 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

Rick Guritz IGARSS Meeting, July 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

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

Rick Guritz IGARSS Meeting, July Pixel Count per Incidence Angle

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

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

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

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

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

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

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

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

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

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

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

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

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

Rick Guritz IGARSS Meeting, July 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

Rick Guritz IGARSS Meeting, July 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

Rick Guritz IGARSS Meeting, July 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

Rick Guritz IGARSS Meeting, July 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)

Rick Guritz IGARSS Meeting, July Questions? Rick Guritz (907) Photo Credit: Don Atwood