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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. - PowerPoint PPT Presentation
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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
Daily MODIS V006 BRDF, Albedo, NBAR
Status and Updates
MCD43AAlbedo (ECV), NBAR (phenology, landcover, biomass, clear-sky), BRDF (anisotropy, structure, clumping) etc.
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
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!!
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
Red 0-0.3Blue 0-0.3Green 0-0.3
V006 True color NBAR DOY 201, 2003
V006 Shortwave WSADOY 201, 2003
MCD43 Collection V006 Eight Day -> Daily
Observation weights 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 V005 eight day product
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 … … …… ……
… …
7
Updates: Number of input observations
▸ V005:
The first 4 layers
▸ V006:
All the available layers
Tile h16v01 Number of observations DOY 240 8
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)
Validate MODIS/Landsat albedo using CAR
Román et al., IEEE Transactions on Geoscience and Remote Sensing,2013
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).
11
Site Name Lat Lon MODIS Tile Land TypeFlux Networks
BC-Campbell River 1949 Douglas-fir 49.867 -125.334 h09v04 Evergreen Needleleaf Forest CCP
SK-1998 Fire 54.092 -106.005 h11v03 Evergreen Needleleaf Forest CCP
Wetzstein 50.454 11.458 h18v03 Evergreen Needleleaf Forest IMECC
Griffin- Aberfeldy-Scotland 56.607 -3.798 h17v03 Evergreen Needleleaf Forest AmeriFlux
Tumbarumba -35.656 148.152 h30v12 Evergreen Broadleaf Forest OzFlux
Hesse Forest- Sarrebourg 48.674 7.066 h18v04 Deciduous Broadleaf Forest IMECC
Walker Branch 35.959 -84.287 h11v05 Deciduous Broadleaf Forest AmeriFluxSK-1989 Fire 54.254 -105.878 h11v03 Mixed Forests CCP
Bily Kriz- Beskidy Mountains 49.502 18.537 h19v04 Mixed Forests IMECCHainich 51.079 10.452 h18v03 Mixed Forests IMECC
Harvard Forest 42.538 -72.172 h12v04 Mixed Forest Ameriflux
Las Majadas del Tietar 39.942 -5.773 h17v05 Closed Shrublands IMECCSkukuza -25.020 31.497 h20v11 Savannas CarboAfricaEl Saler-Sueca 39.276 -0.315 h17v05 Croplands IMECCLangerak 52.004 4.806 h18v03 Croplands IMECCDripsey 51.987 -8.752 h17v03 Grasslands IMECCFort Peck 48.308 -105.102 h11v04 Grasslands SURFRADBoulder 40.050 -105.010 h09v04 Grasslands BSRNCottonwood 43.950 -101.847 h10v04 Grasslands AmeriFluxBarrow 71.323 -156.609 h12v01 Tundra BSRNImnaviat 68.613 -149.312 h12v02 Tundra LTERDesert Rock 36.620 -116.020 h08v05 Desert SURFRAD
IMECC:Infrastructure for Measurements of the European Carbon Cycle
CCP:Canadian Carbon Program
Validation Sites
Mixed ForestNeedleleaf
ForestBroadleaf
ForestSavanna/Shrubland
Grassland/Cropland/
Tundra Desert
All quality
Bias -0.0015 -0.0074 -0.0037 0.0071 0.0047 0.0028
RMSE 0.0187 0.0241 0.0162 0.0129 0.0293 0.0118
Full inversion
Bias -0.0005 -0.0067 -0.0025 0.0086 -0.0006 0.0025
RMSE 0.0152 0.016 0.0123 0.0136 0.0211 0.0108
Magnitude inversion
Bias -0.0025 -0.0079 -0.0052 0.0008 0.0118 0.0107
RMSE 0.0215 0.0294 0.0203 0.0096 0.0375 0.0218
Snow free
Bias -0.0013 -0.0081 -0.0032 0.0071 0.0033 0.0029
RMSE 0.0183 0.0189 0.0151 0.0129 0.0224 0.0117
Snow covered
Bias -0.0102 -0.0018 -0.0275 N/A 0.0175 N/A
RMSE 0.0274 0.0487 0.0465 N/A0.0634
(0.0465)* N/A
* RMSE during fully snow covered period
Validation Results
Spatial Representativeness Harvard Forest
Validation Efforts
Daily V006 NBAR (500m MCD43A4) data for tile h12v04 on 5 Aug 2007 (DOY 2007217). Harvard Experimental Forest Petersham MA
V006 NBAR (500m MCD43A4) data for tile h12v02 on 6 Sep 2009 (DOY 2009249) over the Imnaviat, Alaska Flux Site
Gap-filled Snow-free MODIS Albedo V005
White-sky Albedo DOY 193 2010 RGB
Gap-filled Snow-added-back-in MODIS Albedo
White-sky Albedo DOY 289 2010
Gap-filled Snow-free MODIS Albedo Quality V005
White-sky Albedo DOY 193 2010 QUALITY!!!!!!!!
Surface Structure and AnisotropyLidar Validation Efforts
Alan Strahler
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