polarimetric implications of incidence angle variability for uavsar
TRANSCRIPT
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Rick GuritzIGARSS Meeting, July 28 2011 1
Rick Guritz, Don Atwood1
Bruce Chapman, and Scott Hensley2
1) Alaska Satellite Facility
2) NASA Jet Propulsion Laboratory
POLARIMETRIC IMPLICATIONS OF INCIDENCE
ANGLE VARIABILITY FOR UAVSAR
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Rick GuritzIGARSS 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.
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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
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Rick GuritzIGARSS 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
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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
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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
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Land Cover Classificationof Yellowstone
ylwstn_26903_10067
Aug 10, 2010
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Ellipsoidal Incidence Angle
Ranges from 12 to 64 degrees
Incidence Angle Variability
70 degrees
0 degrees
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Hillshade DEM
Incidence Angle Variability
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Local Incidence Angle
Incidence Angle Variability
90 degrees
0 degrees
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Segmentation of Local Incidence Angle
Incidence Angle Variability
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Reference DataUSGS NLCD 2006
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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
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3x3 Multilooked C3 VanZyl Decomposition Convert to GeoTIFF
POA compensation Compute Class PDFs
in GIS
Polarimetric Processing
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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
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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
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VanZyl Decomposition
(all Incidence Angles)
Surface
Double Bounce
Volume
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Pixel Count per Incidence Angle
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Incidence Angle Analysis
Surface
Double Bounce
Volume
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Incidence Angle Analysis
Surface
Double Bounce
Volume
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Incidence Angle Analysis
Surface
Double Bounce
Volume
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Incidence Angle Analysis
Surface
Double Bounce
Volume
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Incidence Angle Analysis
Surface
Double Bounce
Volume
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Incidence Angle Analysis
Surface
Double Bounce
Volume
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Trend Analysis
Surface
Double Bounce
Volume
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Class: Evergreen
Surface
Double Bounce
Volume
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Class: Woody Wetlands
Surface
Double Bounce
Volume
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Class: Shrub/Scrub
Surface
Double Bounce
Volume
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Class: Herb/Grassland
Surface
Double Bounce
Volume
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Class: Emergent Herb Wetlands
Surface
Double Bounce
Volume
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Class: Barren Ground
Surface
Double Bounce
Volume
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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
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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
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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
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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)
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Questions?
Rick Guritz
(907) 474-7886
Photo Credit: Don Atwood