![]() Landsat 7 ETM+ Thermal Band Detector Alignment.After the change in operations due to this anomaly, a minor seasonal dependency in sensor alignment between the TIRS and Operational Land Imager (OLI) sensor was observed which is accounted for in Collection 2 processing. In December 2014, Landsat 8 experienced a Thermal Infrared Sensor (TIRS) Scene Select Mirror (SSM) anomaly. The number of Landsat 7 ETM+ and Landsat 4-5 TM Level-1 scenes achieving the Collection Tier 1 inventory criteria increases due to these improvements. ![]() Improvements were made to the Landsat 7 Enhanced Thematic Mapper Plus (ETM+) and Landsat 4-5 Thematic Mapper (TM) precision correction algorithm that includes a “decision-tree” like process to identify a good collection of correlated Ground Control Points (GCPs), and to constrain the model fit parameters depending on these GCPs within the scene content.
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