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Monitoring Surface Reflectance Degradation at Desert Site via Calibration Assessment

This study evaluates the calibration assessment of surface reflectance over a desert site using data from Aqua and Terra satellite bands. We explore the degradation of solar diffuser over time, particularly the notable jump observed in Terra bands 1 and 2, attributed to an unaccounted degradation in Level 1B collection methods since April 2009. The chosen offset between -8 and 8 corresponds to the viewing geometry, and the monitoring method provides insights into reflectance changes and degradation levels across multiple spectral bands.

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Monitoring Surface Reflectance Degradation at Desert Site via Calibration Assessment

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  1. Calibration assessment over desert site Eric Vermote

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

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

  4. 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

  5. Aqua band 1 Terra band 1 Terra band 2 Aqua band 2

  6. Terra Band 1

  7. Terra Band 2

  8. Aqua Band 1

  9. Aqua Band 2

  10. 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

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