Listed below are known problems associated with each MODIS Atmosphere data product in Collection 6.
- Water Vapor Product (05_L2): Near-Infrared (NIR) Water Vapor
Do not use the Water Vapor Near IR Product in Collection 006 (C006). There is a problem with the source WVNIR data in 05_L2 HDF files, which then propagates to Level-3 (L3) Daily, Eight-Day, and Monthly.
There are no plans currently in place to fix this problem in C6. Data Users should use Collection 051 (C051) Water Vapor Near Infrared Data instead.
- Cloud Product (06_L2): Cloud Optical Thickness 16 & 37
Product Generation Executive (PGE): PGE06 v6.0.72
Archive Production Time Period: 7/2002-12/2012
The intended maximum reported value for a successful Cloud Optical Thickness (COT) retrieval was increased from 100 in Collection 5 to 150 in Collection 6 (C6). However the new C6 COT datasets Cloud_Optical_Thickness_16 and Cloud_Optical_Thickness_37 were inadvertently not limited to 150. Therefore, for a small number of very bright clouds (typically at low sun angles), these two COT datasets can exceed 150 or become negative due to an integer overflow (beyond a value of 327.67). Users are advised that if they encounter a COT value in these datasets that is either greater than 150, or less than zero but not a fill value, then they should set the value to 150.
View the 06_L2 HISTORY page for details on correction.