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Landsat 8 Level-1 data products continue to be generated and contain valid Operational Land Imager (OLI) data; however the Thermal Infrared Sensor (TIRS) band data will consist of zero-fill and will be unusable at this time.
Details on the TIRS data can be found in the December 19 and December 22, 2014 Headlines. This will be the standard Landsat 8 product content until further notice.