Bad data in a subset of Collection 051
An error involving incorrect Clear Sky Radiances was found in a subset of Terra Collection 051.
This adversely affected all cloud-related parameters in both Level-2 and Level-3 for the impacted subset.
How To Identify Bad C051 Data
All Cloud-related (MOD06_L2, MODATML2, MOD08_D3, MOD08_E3, and MOD08_M3) Collection 051 Terra HDF files with a data date prior to April 1, 2010 (2010 091) and a processing date prior to September 28, 2010 (2010 271) is bad.
Note that this error did not impact Terra C051 HDF files with data dates on or after April 1, 2010 (2010 091); nor did this error impact any Aerosol or Water Vapor SDS's.
Both the data date and production date are a part of the HDF filename.
A new corrected Collection 051 Terra reprocessing effort began again on calendar date September 28, 2010 (2010 271) and is now completed.
Users of cloud-related HDF product files should replace any bad data files with the latest reprocessed C051 data from the LAADS website,
the distributor of MODIS data.
It should be noted that any Collection 051 HDF data file with a data date on or after April 1, 2010 (2010 091) was not impacted by this problem and is considered correct.
Below is a sample HDF file name, along with the 4 keys on how it can be identified as bad data:
The document below describes proposed Collection 051 changes to all L2 and L3 MODIS data.
The next generation of MODIS data products, tagged Collection 051, is expected to began production in November 2008.
