Recent Developments in the MODIS Albedo, Nadir BRDF- Adjusted Reflectance (NBAR)and Reflectance Anisotropy Products (MCD43) Crystal Schaaf (and a huge.

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Presentation transcript:

Recent Developments in the MODIS Albedo, Nadir BRDF- Adjusted Reflectance (NBAR)and Reflectance Anisotropy Products (MCD43) Crystal Schaaf (and a huge cast of collaborators) Center for Remote Sensing, Boston University

Albedo and Reflectance Anisotropy GTOS ECV Essential Climate Variable Schaaf, C.B., J. Cihlar, A. Belward, E. Dutton, and M. Verstraete, Albedo and Reflectance Anisotropy: Assessment of the status of the development of standards for the Terrestrial Essential Climate Variables, GTOS-63/GTOS-ECV-T08, Ed. R. Sessa, Global Terrestrial Observing System (GTOS)Secretariat, FAO, Rome, May Schaaf, C., Albedo and Reflectance Anisotropy, Terrestrial Essential Climate Variables for Climate Change Assessment, Mitigation and Adaptation., GTOS-52, Eds. R. Sessa and H. Dolman, FAO, Rome, 28-29, January Documents stress importance of supporting and expanding high caliber networks such as BSRN, Fluxnet, AERONET

MODIS Anisotropy, Albedo, NBAR Aug. 24 – Sep. 8, 2004 α λ (θ i, Φ i ; θ r, Φ r ) = f iso + f vol k vol + f geo k geo Roujean et al., 1992 MODIS Aqua MODIS Terra Potentially MISR

MODIS Albedo and Reflectance Anisotropy Collection 5 (V005) MCD43A products BRDF parameters NBAR Albedo (WSA, Standard spatial grid resolution 500m Global land, 10deg. tiles, sinusoidal projection Produced every 8 days (on a 16 day period) Snow albedo only retrieved when majority condition over a 16 day period. Extensive quality information

MODIS Albedo, NBAR, Reflectance Anisotropy Collection 5 (V005) MCD43D products Climate Modeling Grid (CMG) global lat/lon 30arc sec grid Majority quality MCD43C products CMG, global lat/lon 0.05degree grid Majority quality Separate snow-free version

MODIS Albedo, NBAR, Reflectance Anisotropy Algorithm originally envisioned as a daily product Long term archive constraints have limited production to periodic retrievals thus far Daily Direct Broadcast Algorithm has allowed implementation of daily rolling 500m (potentially 250m) retrievals in a regional context Australia, China, South Africa, USA (USFS, SDState) view angle correction, rangeland and agricultural monitoring, assessment of disturbance/change UWisc – IMAPP package complete for transition to DRL (Strabala and Gumley)

MODIS Albedo, NBAR, Reflectance Anisotropy – Daily Direct Broadcast Algorithm Daily temporal spectral BSA albedo (true color composites of MODIS band 1, 4, and 3) for the small area (30km by 30 km) centered on the Bartlett tower site for the 2005 growing season. Continuous cloud cover precluded a majority of the retrievals from Days – Yanmin Shuai

MODIS Albedo, NBAR, Reflectance Anisotropy Daily Temporal NBAR-EVI of small area (30km by 30 km) centered the YCES for year 2005 Zhang,X., M. A.Friedl, C. B. Schaaf, Global vegetation phenology from Moderate Resolution Imaging Spectroradiometer (MODIS): Evaluation of global patterns and comparison with in situ measurements,J. Geophys. Res., 111, G04017,doi: /2006JG000217,2006

Albedo and Reflectance Anisotropy Gap-filled snow-free products V004 global 1 min albedos were a very successful collaborative effort with MODIS atmospheres Moody, E. G., M. D. King, S. Platnick, C. B. Schaaf, and F. Gao, Spatially complete global spectral surface albedos: Value-added datasets derived from Terra MODIS land products, IEEE Transactions on Geoscience and Remote Sensing, Vol.43, ,2005.Spatially complete global spectral surface albedos: Value-added datasets derived from Terra MODIS land products, IEEE Transactions on Geoscience and Remote Sensing Moody, E. G., M. D. King, C. B. Schaaf, D. K. Hall Northern Hemisphere five-year average ( ) spectral albedos of surfaces in the presence of snow: Statistics computed from Terra MODIS land productsRemote Sensing of Environment 111 (2007) Northern Hemisphere five-year average ( ) spectral albedos of surfaces in the presence of snow: Statistics computed from Terra MODIS land products Moody, E. G., M. D. King, C. B. Schaaf, and S. Platnick, MODIS-Derived Spatially Complete Surface Albedo Products: Spatial and Temporal Pixel Distribution and Zonal Averages, Journal of Applied Meteorology and Climatology, 47, ,2008MODIS-Derived Spatially Complete Surface Albedo Products: Spatial and Temporal Pixel Distribution and Zonal Averages V005 gap-filled 30arc sec effort currently underway Global lat/lon (from MCD43D) Every 8days (16 day period)

Standard MCD43 Broadband White-Sky Albedo ( mm) No Data June 2001 July 2001

Albedo, NBAR, Reflectance Anisotropy Gap-filled snow- free products GlobalV005 30arc sec global lat/lon (MCD43D) Gap-filled MODIS BRDF product Day Green: high quality, Magenta: temporal fill Yellow :spatial fill

Albedo, NBAR, Reflectance Anisotropy Gap-filled snow-free products NACP V m tiles MODIS NBAR product (DOY 145) 2007, original version with white fill values where no retrievals were possible. Gap-filled version

Albedo, NBAR, Reflectance Anisotropy Modelers have embraced the MODIS global products and current collaborators await the new global gap filled products CLM-CCSM (Lawrence and Chase, 2007) ECMWF (Morcrette et al., 2008) HadGEM-JULES (Houldcroft et al., 2009) GISS (Kiang,pers.com.) Support for derivative products MODIS land cover, phenology, cloud optical properties (Platnick), radiation/PAR (Liang) AATSR aerosol retrievals MERIS GLOBABLEDO albedo precursor (Muller) Surface structural quantities (Hill, Chopping) Landsat corrected reflectance, albedo (Gao/Masek/Shuai, Roy)

Albedo, NBAR, Reflectance Anisotropy Landsat-MODIS Albedo Preliminary validation site: PSU MODIS scale Experiment field at PSU LandSat scale Roy, D.P., Ju, J., Lewis, P., Schaaf, C., Gao, F., Hansen, M., Lindquist, E., 2008, Multi-temporal MODIS-Landsat data fusion for relative radiometric normalization, gap filling, and prediction of Landsat data, Remote Sensing of Environment, 112: WELD radiometrically normalized July m Landsat composite. Band 3, 2, 1 (red, green, blue) TOA reflectance

Albedo, NBAR, Reflectance Anisotropy Validation Strategy Tower albedometers BSRN sites (including SURFRAD and ARM (Dutton) ) Fluxnet/Ameriflux sites (calibration/ventilation/heated) Román, M. O., C. B. Schaaf, P. Lewis, F. Gao, G. P. Anderson, J. L. Privette, A. H. Strahler, C. E. Woodcock, M. Barnsley, Assessing the coupling between surface albedo derived from MODIS and the fraction of diffuse skylight over spatially- characterized landscapes, Remote Sensing of Environment, doi: /j.rse ,2009. Assessing the coupling between surface albedo derived from MODIS and the fraction of diffuse skylight over spatially- characterized landscapes Román, M. O., C. B. Schaaf, C. E. Woodcock, A. H. Strahler, X. Yang, R.H. Braswell, P. Curtis, K.J. Davis, D. Dragoni, M. L. Goulden, L. Gu, D. Y. Hollinger, T. E. Kolb, T.P. Meyer, J. W. Munger, J.L. Privette, A.D. Richardson, T.B. Wilson, S. C. Wofsy, The MODIS (Collection V005) BRDF/albedo product: Assessment of spatial representativeness over forested landscapes, Remote Sensing of Environment, 113, ,2009. The MODIS (Collection V005) BRDF/albedo product: Assessment of spatial representativeness over forested landscapes Liu, J., C. Schaaf, A. Strahler, Z. Jiao, Y. Shuai, Q. Zhang, M. Roman, J. A. Augustine, and E. G. Dutton, Validation of Moderate Resolution Imaging Spectroradiometer (MODIS) albedo retrieval algorithm: Dependence of albedo on solar zenith angle, J. Geophys. Res., 114, D01106, doi: /2008JD009969,2009.Validation of Moderate Resolution Imaging Spectroradiometer (MODIS) albedo retrieval algorithm: Dependence of albedo on solar zenith angle Cloud Absorption Radiometer (CAR) BRDFvalidation CLASIC field campaign 2007 ARM SGP (Román) Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) 2008 winter field campaign (Lyapustin/Kahn) CAR and SSF

Albedo, NBAR, Reflectance Anisotropy Collaboration underway with MODIS Snow Team (Hall/Riggs) Make use of daily MCD43 BRDFs for vegetated scenes Howland, ME

Albedo, NBAR, Reflectance Anisotropy Satellite Product Intercomparisons MODIS with: MISR POLDER/Parasol Meteosat SEVIRI (MSG) SPOT VGT MERIS/GLOBALBEDO CERES CEOS/WGCV/LPV subgroup on Albedo (Nightingale) Current Albedo Chairs: Gabriela Schaepman,Crystal Schaaf Workshops: Boston 2002, Vienna EGU 2005, Beijing 2009