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The image above is extracted from the first of four Science Data Sets in the BRDF/Albedo Quality product. It describes basic QA for BRDF/Albedo data acquired between February 26 and March 13, 2001 over Central America, including the Yucatan Peninsula, El Salvador, Honduras, Nicaragua, and some of Costa Rica (h09v07).
The MODerate-resolution Imaging Spectroradiometer (MODIS) BRDF/Albedo Quality product (MCD43A2) describes the overall condition of the other BRDF and Albedo products. The MCD43A2 product contains 16 days of data at 500-meter spatial resolution provided in a level-3 gridded data set in Sinusoidal projection, and includes albedo quality, snow conditions, ancillary, and inversion information.
Both Terra and Aqua data are used to generate this product, providing the highest probability for quality input data and designating it as an MCD, meaning Combined, product.
Version-5 MODIS BRDF and Albedo products have attained Validation Stage 3.
See Product Description
Science Data Sets for MODIS Terra+Aqua BRDF/Albedo Quality 16-Day L3 Global 500m SIN Grid V005 (MCD43A2):
Science Data Sets
(HDF Layers) 4
|UNITS||BIT TYPE||FILL||VALID RANGE|
|BRDF_Albedo_Quality||Concatenated flags||8-bit unsigned integer||255||0–254|
|Snow_BRDF_Albedo||Concatenated flags||8-bit unsigned integer||255||0–254|
|BRDF_Albedo_Ancillary||Concatenated flags||16-bit unsigned integer||32767||0–32766|
|BRDF_Albedo_Band_Quality||Concatenated flags||32-bit unsigned integer||4294967295||0–4294967294|
One of the more significant differences between the V004 and V005 BRDF/Albedo data products is that the quality information is no longer embedded as a Science Data Set in each product. BRDF/Albedo Quality is now generated as stand alone data in a separate product, MCD43A2, which can be applied to the other BRDF/Albedo products externally through pixel matching.
The table below lists the four Science Data Sets represented in the Quality product, with their associated QC bit legends.
*NOTE: The first two Quality SDSs (BRDF_Albedo_Quality and Snow_BRDF_Albedo) are not bit packed. They are complete byte words that can be read directly.
|1||Processed, see other QA (magnitude BRDF inversions)|
|0||Processed, good quality (full BRDF inversion)|
|1||Snow albedo retrieved|
|0||Snow-free albedo retrieved|
|1||Land (Nothing else but land)|
|2||Ocean and lake shorelines|
|3||Shallow inland water|
|5||Deep inland water|
|6||Moderate or continental ocean|
|08–14||Solar Zenith Angle at Local Solar Noon|
|00–03||Band 1 Quality|
|0||best quality, full inversion (WoDs, RMSE majority good)|
|1||good quality, full inversion|
|2||Magnitude inversion (numobs >=7)|
|3||Magnitude inversion (numobs >=3&<7)|
|04–07||Band 2 Quality (see explanation for band 1)|
|08–11||Band 3 Quality (see explanation for band 1)|
|12–15||Band 4 Quality (see explanation for band 1)|
|16–19||Band 5 Quality (see explanation for band 1)|
|20–23||Band 6 Quality (see explanation for band 1)|
|24–27||Band 7 Quality (see explanation for band 1)|
|31||QAFill (0 = not fill-value; 1 = fill value)|
|Temporal Coverage||February 24, 2000 -|
|Area||~10 x 10 lat/long|
|File Size||~1 MB|
|Dimensions||2400 x 2400 rows/columns|
|Science Data Sets (SDS HDF Layers)||4|
Please find the current MODIS-related Data policies on the MODIS Policies page at https://lpdaac.usgs.gov/products/modis_policies.
For information on how to cite LP DAAC data, please see our Data Citations page at https://lpdaac.usgs.gov/about/citing_lp_daac_and_data.
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The Data Access section of this Web site also provides access to these interfaces.
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