Vicarious calibration of VNIR/SWIR bands of ASTER

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Why bother with vicarious?Radiance validation is most critical for the accurateretrieval of geophysical parameters from temporaldata sets with little to no overlapP Realistically, absolute radiometric calibration may not beneeded for some specific cases! Data from a single sensor with focus on changeanalysis! Multiple sensors for which significant overlap existsP Temporal studies and inter-sensor measurements,however, critically require validated sensors! Biases between sensors need to be removed! Temporal changes in response must be trackedP Temporal studies using multiple sensors with little to nooverlap in data MUST have accurate absoluteradiometric calibration
Why bother with vicarious?Landsat-5 Thematic Mapper results from band 1show significant degradation after launch1.61.5Preflight1.41.31.2Ground-reference0 1 2 3 4 5 6Days since launchThousands
Page 1: Vicarious calibration ofVNIR/SWIR b
Page 6 and 7: Vicarious approachesCurrent approac
Page 8 and 9: Reflectance-Based ApproachMeasuredS
Page 10 and 11: Surface reflectanceMeasure a large
Page 12 and 13: Surface reflectance
Page 14 and 15: Railroad Valley Test Site
Page 16 and 17: Lunar Lake test site
Page 18 and 19: Test site characteristicsTest site
Page 20 and 21: Recent results - ETM+Radiometric ca
Page 22 and 23: ASTER Band 1P Level 1B data do nots
Page 24 and 25: ASTER Band 3P Level 1B similar toBa
Page 26 and 27: 1.05Summary of resultsGraphs below
Page 28 and 29: Solar irradiance model effectsP AST
Page 30 and 31: AVIRIS predicting sensor radianceSh
Page 32 and 33: Coincident MODIS dataUsing ASTER an
Page 34 and 35: Cross-comparison resultsSummary of
Page 36 and 37: ConclusionsP ASTER VNIR bands! Bias
Page 38: ConclusionsP Current level of preci

Vicarious calibration of VNIR/SWIR bands of ASTER

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