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Question:

How do I determine the processing level of the Landsat scene I have downloaded?

Answer:

The processing level is noted in the metadata (.MTL.txt) file that is delivered with each Landsat Level-1 data product (see image below). 

Comparison of Pre-Collection and Collection 1 MTL Processing Levels

The table below displays the Landsat Collection 1 Level-1 Processing Levels. 

Landsat Collection 1 Level-1 Processing Levels