MODIS Collection 6 BRDF/Albedo: Status and Updates Zhuosen Wang 1, Crysal Schaaf 1, Miguel Román 2 1 University of Massachusetts-Boston 2 NASA Goddard.

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MODIS Collection 6 BRDF/Albedo: Status and Updates Zhuosen Wang 1, Crysal Schaaf 1, Miguel Román 2 1 University of Massachusetts-Boston 2 NASA Goddard Space Flight Center April,

Outline Collection 6 updates Validation NEON sites Conclusion 2 MODIS Science Team Meeting, 2013

Updates: Eight Day -> Daily Observations weighted Temporal, observation coverage, band quality oldest Dynamic observation stream newest day 1, day 2... day 9, … day 16, day xxx … day 24, day 25 … day xxx+15 … … … Collection 5 eight day product Collection 6 daily product oldest Dynamic observation stream newest day 1, day 2... day 9, … day 16, day xxx … day 24, day 25 … day xxx+15 … … … … … 3 MODIS Science Team Meeting, 2013

Updates: Capture Disturbance shortwave WSA shortwave WSA shortwave WSA shortwave WSA shortwave WSA shortwave WSA Anaktuvuk River Fire location in MODIS Science Team Meeting, 2013

Updates: Magnitude Inversion Collection 5: Land cover based Collection 6: Pixel based Updated from the latest full inversion C6 backup database Fiso 5 Back-up Database MODIS Science Team Meeting, 2013

Updates: Number of input observations increased Collection 5: The first 4 layers Collection 6: All the available observations Tile h16v01 Number of observations, DOY MODIS Science Team Meeting, 2013

Updates: Snow status Snow cover MOD10A1 product as input -- separate 100 % snow cover and partly snow cover 7 MODIS Science Team Meeting, 2013

Updates: Snow /non snow status Collection 5: Majority snow/non snow status Collection 6: Current day snow/non snow status Barrow C SW WSA Barrow C SW WSA DOY 157 DOY 145 (input from 145 to 160) Snowmelt 8 MODIS Science Team Meeting, 2013

Updates: Climate Modeling Grid (CMG) Albedo Collection 5: Aggregated from 500 m albedo Collection 6: Redo the retrieval using all the clear sky observations within 1km grid for MCD43D. MCD43B is discontinued. H12v04 true color DOY MODIS Science Team Meeting, 2013

Updates: Quality Collection 6 Overall Quality Snow status Ancillary Valid observations for each day Quality flag Band 1 … Quality flag Band 7 Uncertainty Collection 5 Overall Quality Snow status Ancillary Band Quality flag 10 MODIS Science Team Meeting, 2013

Updates: Adjust the Quality Threshold Shuai et al., 2008 GRL 11 MODIS Science Team Meeting, 2013

Validation: Compare with in situ measurements 12 MODIS Science Team Meeting, 2013

Validate MODIS/Landsat albedo using CAR data Román et al., IEEE Transactions on Geoscience and Remote Sensing,2013 In general, the satellite derived estimates met 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). 13 MODIS Science Team Meeting, 2013

Evaluation at NEON sites: Location NEON core sites location Courtesy of 14 Continue to expand our validation sites beyond Surfrad, BSRN, and Flux sites to include NEON sites. MODIS Science Team Meeting, 2013

NEON sites: Spatial Representativeness Domain 17: San Joaquin Experimental Range More representative site Domain 17: San Joaquin Experimental Range Domain 18: Toolik Lake Less representative site Domain 18: Toolik Lake 15 Xiaoyuan Yang MODIS Science Team Meeting, 2013

NEON sites: Albedometer Height Analysis 10m (left), 20m (center) and 30m (right) albedometer heights are applied to each sites to evaluate the changing of R se parameter with respect to MODIS Science Team Meeting, 2013

NEON sites: Fused MODIS and Landsat NBAR 17 MODIS Science Team Meeting, 2013

Conclusion C6 daily BRDF/albedo product can now capture rapid land surface changes – snowmelt, fire etc. More high quality output is produced because of the increase in the number of observations (especially over high latitude areas). The MODIS albedos agree well with ground and airborne measurements. The fusion of MODIS and Landsat produces vegetation index that track dynamic land surface characteristics with high temporal/spatial resolution. 18 MODIS Science Team Meeting, 2013