The processing level is noted in the metadata (.MTL.txt) file that is delivered with each Landsat Level-1 data product.
Processing level designations changed when Landsat 1-8 scenes were processed into Collection 1 Level-1 data products (see the table below).
Landsat 9 Level-1 data products will contain the same processing level designation.
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.|
Within the MTL.txt file for each Pre-Collection and Collection 1 scene, the processing level is listed as DATA TYPE, as seen in the figure below.
Pre-Collection (left) and Collection 1 processing levels as noted in the metadata (MTL.txt) file.