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VALIDATION
04_L2 Known Problems
05_L2 Known Problems
06_L2 Known Problems
07_L2 Known Problems
35_L2 Known Problems
ATML2 Known Problems
08_D3 Known Problems
08_E3 Known Problems
08_M3 Known Problems

Known Problem Summary

Tracking of known problems and subsequent fixes is an important issue for MODIS data users. This page will act as a repository of all known MODIS Atmosphere Data Product problems, as well as how to determine the problematic version (and the fixed version) of the HDF data -- therefore data users should check this page for updates regularly. Data Users unfamiliar with how to properly track problems and fixes by determining the version of their downloaded HDF files should refer to the documentation at the bottom of this page.      

Collection 006 Issues

Click the colored buttons below for the known problems associated with each MODIS Atmosphere Data Product in Collection 6.

Click to see 04_L2 Known Problems Click to see 05_L2 Known Problems Click to see 06_L2 Known Problems Click to see 07_L2 Known Problems Click to see 35_L2 Known Problems Click to see ATML2 Known Problems Click to see 08_D3 Known Problems Click to see 08_E3 Known Problems Click to see 08_M3 Known Problems


  • Missing Granules/Orbits in Sep-Nov 2014 Aqua Data

    Description: Incorrect production rules in MODAPS caused the initial release of Aqua MOD08_D3 data to be missing some granules/orbits in the September to November 2014 time period. Data was rerun and new corrected files are now available for download. An example animation showing this problem (before and after correction) is displayed to the right. Just to clarify, this was not a software/code bug, but instead a problem in the operational production rules.

    Impact: Medium

    Data Dates Affected: 9/9/2014-11/20/2014

    Platform Affected: Aqua Only

     
    PGE Version Production Dates   PGE Version Production Dates
    ≤ PGE56 v6.1.5 ≤ 2014 252 (9/9/2014)   ≥ PGE56 v6.1.9 ≥ 2014 324 (11/20/2014)



  • Problems in input 04_L2, 05_L2, 06_L2, 07_L2, and 35_L2 propagate into 08_D3

    Description:

    See the Known Problem pages for the input Level-2 products 04_L2 (Aerosol), 05_L2 (Water Vapor), 06_L2 (Cloud), 07_L2 (Profiles), and 35_L2 (Cloud Mask) by clicking on the links or the colored tabs above.







Latest PGE Version Available (by Data Date)

Shown below is a bar chart graphic summarizing the latest Product Generation Executive (PGE) Version used to produce Collection 6 (C6) 08_D3 HDF files available for public distribution (download) in the LAADS data archive. This graphical representation gives MODIS data users a summary guide (digestable at a glance) on how the PGE Version varies across the multi-year data record. Each PGE version contains a unique set of fixes and improvments and show where data quality discontinuities can occur. If MODIS data users have older versions of any of the data shown below, they should download the newer (more correct) version from either: LAADS FTP (Download C6 MYD08_D3 Data) or LAADS Web (Search & Order MODIS Data)

Aqua:

     








How to Track MODIS Data File "Versions" (Important for Tracking Problems and Fixes)

Problems and fixes in MODIS Atmosphere Product HDF files can be tracked in one of two ways:

  1. the Product Generation Executive (PGE) Version Number that can be queried from any HDF file using the command:
      ncdump -h *.hdf
  2. the HDF File "Production Date".

The HDF File "Production Date", which is the date the HDF file was actually generated or produced, can be found in the HDF filename itself (shown in green color below):
Level 2 Product Names:

 Level 3 Product Names:

Note that 1.) all times are UTC time, not local time 2.) the DDD in the date denotes the Julian Date (001-366), and 3.) the MOD06_L2 (or MOD08_D3) prefix is only an example (MYD04_L2, MOD05_L2, MYD05_L2, MYD06_L2, etc. ... or MYD08_D3, MOD08_E3, MYD08_E3, MOD08_M3, MYD08_M3 could be substituted).