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Daily MODIS V006 BRDF, Albedo, NBAR Status and Updates

Daily MODIS V006 BRDF, Albedo, NBAR Status and Updates. Zhuosen Wang, Crystal Schaaf, Qingsong Sun, Yan Liu, Alan Strahler University of Massachusetts Boston, Boston University, NASA/GSFC And the large contingent of colleagues who have contributed to the development and validation of MCD43.

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Daily MODIS V006 BRDF, Albedo, NBAR Status and Updates

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  1. Daily MODIS V006 BRDF, Albedo, NBARStatus and Updates Zhuosen Wang, Crystal Schaaf, Qingsong Sun, Yan Liu, Alan Strahler University of Massachusetts Boston, Boston University, NASA/GSFC And the large contingent of colleagues who have contributed to the development and validation of MCD43

  2. Daily MODIS V006 BRDF, Albedo, NBARStatus and Updates • MCD43A • Albedo (ECV), NBAR (phenology, landcover, biomass, clear-sky), BRDF (anisotropy, structure, clumping) etc.

  3. Daily MODIS V006 BRDF, Albedo, NBAR • DAILY MCD43A • Was originally proposed as a daily product • Retrieved each day utilizing all high-quality, multi-date, multi-angle, cloud-free surface reflectances from a rolling 16-day period • Day of interest is center date • Fit semi-empirical Ross Thick Lis Sparce Reciprocal BRDF Model • Number of angularly well distributed obs (RMSE, WoD) • Weighted by quality, obscov, vicinity to day of interest • Produced in 10˚ tiles on a 500m sinusoidal grid

  4. Daily MODIS V006 BRDF, Albedo, NBAR • DAILY MCD43A • Extensive Quality flags • Byte, not bit packed (mostly - dates used) • Snow albedo retrieval (utilizing MO/YD10) • Conservative high quality full inversion retrievals • Poor quality back up magnitude inversion algorithm uses more recent high quality retrieval as a priori BRDF shape • USE the QA!!

  5. Daily MODIS V006 BRDF, Albedo, NBAR • Daily CMG BRDF, Albedo, NBAR (MCD43D) • 30arc-second global • Separate full retrieval • Uncertainty measures • MCD43C (0.05 degree CMG) is average of underlying parameters • Quality based on majority of underlying qualities • MCD43_GF 30arc-second snow-free, gap-filled global CMG • V005 version is available

  6. Red 0-0.3 Blue 0-0.3 Green 0-0.3 V006 True color NBAR DOY 201, 2003 V006 Shortwave WSA DOY 201, 2003

  7. MCD43 Collection V006 Eight Day -> Daily Collection V005 eight day product oldest Dynamic observation stream newest day 1, day 2 ... day 9, … day 16, day xxx … day 24 , day 25 … day xxx+15 … … … … … Collection V006 daily product oldest Dynamic observation stream newest day -8, day -7…DOI…, day 8, day xxx … day 16 , day 17 … day xxx+15 … … … … … … Observation weights Temporal, observation coverage, band quality

  8. Updates: Number of input observations • V005: The first 4 layers • V006: All the available layers Tile h16v01 Number of observations DOY 240

  9. Extensive Validation • CEOS/WGCV/Land Product Validation • BSRN (gold standard of tower albedo measurements) • Ameriflux, Surfrad, NEON, ARM, Fluxnet etc. • Spatial representativeness of sites (Román et al., 2009) • Multi-angle Airborne measurement (CAR, GLiHT etc) • Lidar Measurements of Structure (DWEL, CBL, Airborne)

  10. Validate MODIS/Landsat albedo using CAR In general, the satellite derived estimates meet the accuracy requirements established for the high-quality MODIS operational albedos at 500 m (the greater of 0.02 units or ±10% of surface measured values). Román et al., IEEE Transactions on Geoscience and Remote Sensing,2013

  11. Validation Sites CCP: Canadian Carbon Program IMECC: Infrastructure for Measurements of the European Carbon Cycle

  12. Validation Results * RMSE during fully snow covered period

  13. Spatial Representativeness Harvard Forest

  14. Validation Efforts Daily V006 NBAR (500m MCD43A4) data for tile h12v04 on 5 Aug 2007 (DOY 2007217). Harvard Experimental Forest Petersham MA

  15. V006 NBAR (500m MCD43A4) data for tile h12v02 on 6 Sep 2009 (DOY 2009249) over the Imnaviat, Alaska Flux Site

  16. Gap-filled Snow-free MODIS Albedo V005 White-sky Albedo DOY 193 2010 RGB

  17. Gap-filled Snow-added-back-in MODIS Albedo White-sky Albedo DOY 289 2010

  18. Gap-filled Snow-free MODIS Albedo Quality V005 White-sky Albedo DOY 193 2010 QUALITY!!!!!!!!

  19. Surface Structure and AnisotropyLidar Validation Efforts Alan Strahler

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