How can I tell the difference between Landsat Collections data and Landsat data I have downloaded in the past?

The first indication you have data processed meeting Collections specifications is that your data will have a Landsat Product Identifier, not the historical Landsat Scene ID. Along with information inherited from the Scene ID, the Landsat Product Identifier includes the processing level, processing date, collection number, and collection category (bolded below).

Scene ID Landsat Product Identifier
L = Landsat
X = Sensor
S = Satellite
PPP = WRS path
RRR = WRS row
YYYY = Year
DDD = Julian day of year
GSI = Ground station identifier
VV = Archive version number
L = Landsat
X = Sensor (C=OLI?TIRS Combined, O=OLI-only, T=TIRS-only, E=ETM+, T=TM, M=MSS)
SS = Satellite (07=Landsat 7, 08=Landsat 8)
LLLL = Processing correction level (L1TP=Precision Terrain, L1GT=Systematic Terrain, L1GS=Systematic)
PPP = WRS path
RRR = WRS row
YYYYMMDD = Acquisition year (YYYY)/Month (MM)/Day (DD)
yyyymmdd = Processing year (yyyy)/Month (mm)/Day (dd)
CC = Collection number (01, 02)
TX = Collection category (RT = Real-Time, T1=Tier 1, or T2=Tier 2)


The historical scene ID is listed in the metadata file (MTL.txt) delivered with the Level-1 data product, and is also visible and searchable (along with the Landsat Collection Product ID) in the online metadata on EarthExplorer.

Learn more: Landsat Collections

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