Timestamp Error in MODIS L2P Aqua and Terra Datasets

Timestamp Error in MODIS L2P Aqua and Terra Datasets

Postby yiboj » Tue Feb 28, 2017 1:39 pm

The timestamp (from variable time which is the total seconds after January 1, 1981 ) provided in the MODIS L2P Aqua and Terra data files has a wrong value due to an erroneous handling of leap second offsets. Subtract the offset values listed in the table below for each year to get the corrected time value.

Corrected_time = variable_time_in_file - offset

MODIS L2P granules produced after January 1, 2017 do not have this issue.

*************************************************************
Year | Aqua offset | Terra offset
*************************************************************
2001 | 32 | 32
2002 | 32 | 32
2003 | 32 | 32
2004 | 32 | 32
2005 | 32 | 32
2006 | 33 | 33
2007 | 33 | 33
2008 | 33 | 33
2009 | 34 | 34
2010 | 34 | 34
2011 | 34 | 34
2012 | 34 | 34
2013 | 34 | 34
2014 | 34 | 34
2015 | 34 | 34
2016 | 34 | 34
2017 | 0 | 0
*************************************************************
yiboj
 
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