Landsat 4-5 Thematic Mapper NLAPS-processed scenes

Some Landsat 4-5 Thematic Mapper (TM) data acquired between 1984 and 1989 cannot be processed by LPGS and added to the Collection 1 Level-1 dataset. Instead, these scenes were processed by the National Land Archive Production System (NLAPS), which was the original Landsat processing system prior to implementing LPGS when Landsat 7 data became available in 1999. 

Visit the Landsat Processing Systems page for more information.