Lance-MODIS Terra data gaps

PlatformTerra
InstrumentMODIS
Sourcelance-modis
Issuenews
Last Updated2015-10-09 21:30:00
Start2015-10-09 19:45:00
End2015-10-09 20:15:00
Description 2015-10-09T21:30:00Z
A MODIS Terra L0 MOD00S granule covering 19:06:52 to 20:19:41z with significant data gaps was used in MODIS Near Real Time processing before receipt of a followup granule without gaps. MOD00F granules in this time range have been reprocessed and an all appear to have nominal size for a night granules:
    PGE_StartTime    |   IngestTime    | FileSizeBytes | DNF | small 
---------------------+-----------------+---------------+-----+-------
 2015-10-09 19:45:00 | 21:07:46.303759 |     118087536 | N   | 
 2015-10-09 19:50:00 | 21:08:06.928918 |     118087536 | N   | 
 2015-10-09 19:55:00 | 21:07:42.027811 |     118087536 | N   | 
 2015-10-09 20:00:00 | 21:07:20.774649 |     118151736 | N   | 
 2015-10-09 20:05:00 | 21:07:54.19342  |     118100376 | N   | 
 2015-10-09 20:10:00 | 21:08:21.736805 |     118215936 | N   | 
However no reprocessing downstream of MOD00F (5 minute L0) will be performed. The unreprocessed granules were smaller by the following number of bytes which provides an estimate of the quality of downstream products at the same time:
    PGE_StartTime    | size_diff | cksum_diff 
---------------------+-----------+------------
 2015-10-09 19:45:00 |  26291814 | Y
 2015-10-09 19:50:00 |         0 |   (ok without reprocessing)
 2015-10-09 19:55:00 |   1146336 | Y
 2015-10-09 20:00:00 | 116872470 | Y (ok, see below)
 2015-10-09 20:05:00 |  81760368 | Y
 2015-10-09 20:10:00 |  61486368 | Y
Downstream granules at 20:00 use the reprocessed MOD00F as initial PGE01 processing failed with the unreprocessed input.

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Last updated: May 30, 2018