MODIS Atmosphere
MODIS Atmosphere Home Products  Images  Validation  News  Staff  Forum  Reference  Tools  Help
Aerosol Product  Water Vapor Product  Cloud Product  Atmosphere Profile Product  Cloud Mask Product   Joint Atmosphere ProductLevel-2 Products
Daily Global Product  Eight-Day Global Product  Monthly Global ProductLevel-3 Products       Filled Land Surface Albedo ProductFilled Normalized Difference Vegetative Index ProductOne-Minute Land Ecosystem Classification ProductLevel-3 Ancillary Land Surface Products
Format & Content
Grids & Mapping
Sample Images
Known Problems
Product Modification History
Acquiring Data
Filename Convention
Analysis Tools
Theoretical Basis
Detailed File Spec
Algorithm Software
Production Plan
Support Team

QA Information

Known Problems in Collection 6 Data

  • Cloud Optical Properties

      Platform: Aqua
      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 HISTORY page for details on correction.

Next Page