Combined MODIS Valid Observation for band 4 data from the MCD43D36 product across the globe, August 2, 2018.View full-size image
The MCD43D36 Version 6 Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) QA ValidObs Band 4 dataset is produced daily using 16 days of Terra and Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) data at 30 arc second (1,000 meter (m)) resolution. Data are temporally weighted to the ninth day which is reflected in the Julian date in the file name. This Climate Modeling Grid (CMG) product covers the entire globe for use in climate simulation models. Due to the large file size, each MCD43D product contains just one data layer. MCD43D36 provides MODIS band 4 valid observation quality information for the MCD43D products.
MCD43D36 contains the valid observation quality layer representing each of the 16 days of the retrieval period for MODIS band 4.
Users are urged to use the band specific quality flags to isolate the highest quality full inversion results for their own science applications as described in the User Guide.
Validation at stage 3 has been achieved for all MODIS BRDF/Albedo products. Further details regarding MODIS land product validation for the MCD43 data products are available from the MODIS Land Team Validation site.
|File Size||~160.02 MB|
|Temporal Extent||2000-02-16 to 2023-02-17|
|Coordinate System||Geographic Latitude and Longitude|
|Number of Science Dataset (SDS) Layers||1|
|Columns/Rows||43200 x 21600|
|Pixel Size||~1000 m|
|SDS Name||Description||Units||Data Type||Fill Value||No Data Value||Valid Range||Scale Factor|
|Global_BRDF_ValidObs_Band4||Valid Observation for band 4||Bit Field||16-bit unsigned integer||0||N/A||1 to 65535||N/A|
|0||Observation not used|
|1||Valid clear observation|
The incorrect representation of the aerosol quantities (low average high) in the C6 MYD09 and MOD09 surface reflectance products may have impacted downstream products particularly over arid bright surfaces. This (and a few other issues) have been corrected for C6.1. Therefore users should avoid substantive use of the C6 MCD43 products and wait for the C6.1 products. In any event, users are always strongly encouraged to download and use the extensive QA data provided in MCD43A2, in addition to the briefer mandatory QAs provided as part of the MCD43A1, 3, and 4 products.
Corrections were implemented in Collection 6.1 reprocessing.
For complete information about MCD43D36 known issues refer to the MODIS Land Quality Assessment website.