Knowledge Base

Missing and delayed VIIRS data

The lag time between observations and availability of VIIRS products is only a few days. Lag time may be extended due to satellite maneuvers and extra quality assurance required for the geolocation data after the maneuver. The MODAPS VIIRS/NPP web site contains this information. The following table shows permanently missing VIIRS data. This list is updated when data gaps are discovered and may not be complete. If you discover missing data, contact NSIDC User Services at to clarify.

Date and times
2012.03.25, 00:00 to 23:59
2012.03.26, 00:00 to 17:15
2014.08.25, 00:00 to 23:59