The processing level designations can be found in the metadata (.MTL.txt) files that are delivered with Landsat Level-1 data products.
The MTL.txt file is included when data is processed through the Level-1 Product Generation System (LPGS). All Landsat 8 (2013-present), all Landsat 7 ETM+ (1999-present), most Landsat 4-5 TM (1982-present) and all Landsat MSS 1-5 (1972-1983 and 2012-2013) data are processed through LPGS.
The processing level designations changed when Landsat 8, Landsat 7, and Landsat 4-5 TM scenes were processed into Collection 1 Level-1 data products. Landsat 1-5 MSS scenes remain Pre-Collection data products until they are processed into the Collection 1 archive, which is planned to begin late 2017.
Landsat Level-1 Data Products Processing Levels
Radiometrically calibrated and orthorectified using ground control points and digital elevation model (DEM) data to correct for relieft displacement. These are the highest quality Level-1 products suitable for pixel-level time series analysis.
Radiometrically calibrated and systematic geometric corrections applied using the spacecraft ephemeris and DEM data to correct for relief displacement.
|Radiometrically calibrated with systematic geometric corrections using the spacecraft ephemeris data.|
Figure 1. Pre-Collection and Collection 1 Processing Levels
Within the MTL.txt file for each Pre-Collection and Collection 1 scene, the processing level is listed as DATA TYPE, as seen in Figure 2 below.
Figure 2. Left: Pre-Collection Processing Level designation in metadata file. Right: Collection 1 Processing Level designation in metadata file.