MRO CRISM TRR3 Hyperspectral Data Filtering
Transcript of MRO CRISM TRR3 Hyperspectral Data Filtering
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MRO CRISM TRR3 Hyperspectral Data Filtering
CRISM Data User's Workshop03/18/12
F. Seelos, CRISM SOC
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CRISM PDS-Delivered VNIR TRR3 I/F3-Panel Plot
Scene median spectrum
Spectral percentile envelope(1st - 99th percentile)
Composite RGB bands
False Color RGB Composite
Composite band distribution box plot
Composite band stretch limits
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CRISM PDS-Delivered IR TRR3 I/F
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CRISM PDS-Delivered IR TRR3 Radiance Transformed to I/F
• IR detector temperature is the most significant driver for both systematic and stochastic noise in the CRISM IR data set
• Systematic noise appears in the ground plane as along-track striping• Time invariant (over the duration of the observation) calibration residual related to a specific [spatial, spectral] pixel on the IR detector
• Stochastic noise appears as data spikes with limited spatial and spectral extent and as time dependent (over the duration of the observation) variability in detector element responsivity
• The hyperspectral data filtering procedure seeks to isolate and mitigate these noise components without adversely impacting the spatial/spectral information content of the observation
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IR Detector Temperature Mission Profile
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Targeted Observation IR Detector Temperature Distribution
Walk through: FRT000094F6FRT00021BCB
Data Processing:FRT0000C202
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CalculateReference
TRR I/F/
Reference
Restore I/F RSCIKF
ReferenceTRR I/F Ratio
Ratio RSCResolveResolve
RSC
RSCResolve RSC
*Reference
Hyperspectral Data Filtering Processing Pipeline
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CRISM PDS-Delivered IR TRR3 Radiance Transformed to I/F
• Hyperspectral data filtering input image cube • TRR3 radiance image cube transformed to I/F
I/F = Radiance / [Solar Irradiance / (π * (Solar Distance)2)]
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Reference Image Cube
• Low spectral frequency / high spatial frequency transformation of input image cube
• Pristine representation of the spectral 'continuum' for each spatial pixel
• Any noise structure retained in the reference cube will be propagated without modification into the filtering result
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Ratio Image Cube
• Ratio Image Cube = [Input Image Cube] / [Reference Image Cube]
• High frequency spectral and low frequency spatial information retained in ratio image cube• Scene spectral variability and noise• Cross-track smile structure
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Ratio-RSC Image Cube
• Characterizes systematic column-oriented radiometric residuals through the serial evaluation of inter-column ratio statistics• Derived correction frame preserves statistically supported cross-track structure consistent with a reference model configuration
Ratio Shift Correction
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IKF Resolve Image Cube
Iterative Kernel Filter
• Isolates stochastic noise through the iterative kernel-based application of a formal statistical outlier test• Interpolation through outlier target pixels is performed by a proximity-weighted multidimensional polynomial model that excludes all kernel neighborhood outliers• Kernel size = [5,3,5]:[x,y,λ]• Confidence threshold and reference model configuration vary with wavelength
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Resolve RSC Image Cube
Ratio Shift Correction
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Ratio Image Cube
• Ratio Image Cube = [Input Image Cube] / [Reference Image Cube]
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Restore Image CubeCRISM PDS-Delivered IR TRR3 I/F
• Restore Image Cube = [Resolve RSC Image Cube] * [Reference Image Cube]
Single pixel input and output spectrum
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CRISM PDS-Delivered IR TRR3 Radiance Transformed to I/F
• Hyperspectral data filtering input image cube • TRR3 radiance image cube transformed to I/F
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Input / Output Ratio Image Cube
• Input Image Cube / Output Image Cube
• Median input/output spectrum is nearly stationary
• RSC – I/O ratio structure that is consistent along an entire column
• IKF – All other I/O ratio structure
Single pixel input/output ratio spectrum
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TRR3 Product Availability
CRISM TRR3Hyperspectral Data Filtering