Calibration assessment over desert site Eric Vermote.

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Presentation transcript:

Calibration assessment over desert site Eric Vermote

Surface Reflectance (smoothed) observed over desert site –band 1

Surface Reflectance (smoothed) observed over desert site –band 2

Method for monitoring degradation Where the offset (between -8 and 8) is chosen to match viewing geometry (or AOI) Where i is between 0 and 15

Terra band 1 Terra band 2 Aqua band 1 Aqua band 2

Terra Band 1

Terra Band 2

Aqua Band 1

Aqua Band 2

Conclusion The jump observed in Terra band 1 and 2 surface reflectance is in part of fully due to degradation not accounted for in collection 5 Level 1B due to introduction of extra solar diffuser degradation in April 2009 for almost all bands (1 to 4 and 8 – 19) 1.3% decrease in m1 -> 1.3% decrease in TOA reflectance