![]() ![]() After extensive historical on-orbit characterization and calibration efforts of the thermal band detector placement, revised focal plane values have been determined. Landsat 7 ETM+ Thermal Band 6 includes a minor odd-to-even detector misalignment due to pre-launch detector-based focal plane values. 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. Landsat 7 ETM+ and Landsat 4-5 TM Precision Correction Logic.For example, this is most pronounced at the southern tip of South America (path 227/row 99). Removing this constraint allows for more extreme latitude acquisitions to process to a Level-1 Terrain Precision (L1TP) product. Landsat Collection 1 Level-1 scenes with a Digital Elevation Model (DEM) value beyond the geographical extent (-57.0 degrees latitude) of the elevation source only process to a Level-1 Systematic Terrain (L1GT) product. This page provides details about the changes users can find in Landsat Collection 2 Level-1 data. See the instrument-specific Data Format Control Books listed at below on this page for a more comprehensive overview of these data characteristics. Several data processing, geometric, and radiometric improvements, along with a new data distribution process, define Collection 2 Level-1 data. Go to Collection 2 Level-2 Product Information ![]()
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