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Preliminary analysis for MODIS and VIIRS by using MICROS

Preliminary analysis for MODIS and VIIRS by using MICROS. Xingming Liang. SST bands. Processing Specifics. Characteristics VIIRS versus MODIS. Comparison of Histograms. AVHRR Ch3B like. MODIS-AUQA coefficient used to simulate VIIRS BTs. VIIRS coefficient used to simulate VIIRS BTs.

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Preliminary analysis for MODIS and VIIRS by using MICROS

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  1. Preliminary analysis for MODIS and VIIRS by using MICROS Xingming Liang

  2. SST bands

  3. Processing Specifics

  4. Characteristics VIIRS versus MODIS

  5. Comparison of Histograms

  6. AVHRR Ch3B like MODIS-AUQA coefficient used to simulate VIIRS BTs VIIRS coefficient used to simulate VIIRS BTs

  7. AVHRR Ch4 like • By using AQUA Coeff. to simulate VIIRS BTs for Ch3 and Ch4, the M-O biases and SDs are all reduced. • NOBS in VIIRS is 4 times lager than MODIS.

  8. AVHRR Ch5 like • Different from Ch3 and Ch4, using AQUA Coeff. to simulate VIIRS Ch5 BTs, the M-O biases are SDs increase.

  9. SST Large VIIRS SST biases may be due to SST coeff.

  10. Comparison of gloal M-O and SST maps -- MODIS/Terra vs MODIS/AQUA -- -- VIIRS/VIIRS Coef. vs VIIRS/AQUA Coef. --

  11. AVHRR Ch3B like • M-O bias in AQUA is 0.3 K larger than TERRA; • High latitude with high M-O bias, more significant for AQUA. • Adjusting Clear-sky mask for MODIS and VIIRS is needed. MODIS-TERRA Ch20 VIIRS-NPP Ch12, VIIRS Coeff

  12. AVHRR Ch3B like • Using AQUA Coefficient to simulate VIIRS BT • M-O biases are reduced from -1.3 K to -1.0 K ; • More Gaussian distribution. • Remaining bias may be due to • inaccuracy in the proxy sensor BTs • CRTM simulation MODIS-AQUA Ch20 VIIRS-NPP Ch12, AQUA Coeff

  13. AVHRR Ch4 like MODIS-TERRA Ch31 VIIRS-NPP Ch15, VIIRS Coeff

  14. AVHRR Ch4 like MODIS-AQUA Ch31 • M-O biases In near equator are significantly reduced by using AQUA Coefficient to simulate VIIRS BT VIIRS-NPP Ch15, AQUA Coeff

  15. AVHRR Ch5 like MODIS-TERRA Ch31 MODIS-TERRA Ch32 VIIRS-NPP Ch16, VIIRS Coeff

  16. AVHRR Ch5 like MODIS-AQUA Ch32 VIIRS-NPP Ch16, AQUA Coeff

  17. SST

  18. SST

  19. Comparison of dependencies VIIRS-NPP (Ch12, VIIRS Coeff) and MODIS/Terra & AQUA (Ch20)

  20. VIIRS dependences are likely more obvious than MODIS. • Sensor view angles for MODIS and VIIRS are not negative value, which is inconsistent with AVHRR • current John is working on this issue.

  21. Conclusion • Adjusting clear-sky mask for MODIS and VIIRS is needed. • SST coefficients need to be recalculated for MODIS and VIIRS. • Using AQUA coefficient to simulate VIIRS BTs, M-O biases are reduced in Ch3B and Ch4, but increase in Ch5. • The remaining bias may be due to inaccuracy in the proxy sensor BTs or CRTM simulation.

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