MODIS/Terra+Aqua Nadir BRDF-Adjusted Reflectance 16-Day L3 Global 1km SIN Grid
MCD43B4
Version
Acquisition Range
Science Quality Status
V004
July 4 2002 (2002185)
Validated
Nadir BRDF-Adjusted Reflectance of North America for August 13, 2002.
NIR (0.1-0.4) Red (0.0-0.16) Green (0.0-0.18)
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 3 (1200x1200x7 row/column/band)
Average File Size = ~52 MB
Resolution = 1000 meters
Projection = Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 3
Product Description
Every 16 days, the MODIS BRDF/Albedo Product (MCD43B) algorithm relies on multidate, atmospherically corrected, cloud-cleared data and a semiempirical kernel-driven bidirectional reflectance model to determine a global set of parameters describing the Bidirectional Reflectance Distribution Function (BRDF) of the land surface. These one kilometer gridded parameters are then used to determine directional hemispherical reflectance ("black-sky albedo"), bihemispherical reflectance ("white-sky albedo"), and nadir BRDF-adjusted reflectance (NBAR) for seven narrow spectral bands and (in the case of albedo) three broad bands. Since the parameters of the simple kernel-based BRDF model (RossThickLiSparseR) are also provided, along with extensive quality information, the MODIS BRDF/Albedo Product offers members of the global remote sensing and modeling community the additional flexibility to derive reflectance and albedo measures particularlysuited to their specific applications.
MCD43B is a MODLAND Level 3 Product and is provided globally as discrete 1200 by 1200 element tiles in a Sinusoidal Grid projection in a HDF-EOS format. MCD43B1
provides the primary BRDF model parameters. MCD43B3 provides the black-sky albedo (at the mean solar zenith angle at local solar noon) and the white-sky albedo. MCD43B4 provides two NBAR values, one at the mean solar zenith angle of Terra overpasses during the 16-day period and the other at the mean solar zenith angle of the Aqua overpasses. Quality information is replicated and available with each quantity.
MCD products are generated using a combination of Terra and Aqua acquisitions to optimize data quality.
Note: These products are validated, meaning that product uncertainties are well defined over a range of representative conditions. Although there may be later improved versions, these data are ready for use in scientific publications.
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U.S. Geological Survey (USGS)
Earth Resources Observation and Science Center (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001