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How do Landsat Collection 2 Level-2 products compare with products from Collection 1?

Landsat Collection 2 Level-2 Surface Reflectance and Surface Temperature products are scene-based, are produced within the standard processing system, and are made available to download directly from EarthExplorer. In comparison, Landsat Collection 1 Level-2 products are only available via on-demand processing (Surface Reflectance, scene-based), or within Landsat Collection 1 U.S. Analysis Ready Data (ARD) (Surface Temperature, tile-based).  The table below provides a brief overview of the differences between Collection 1 and Collection 2 Level-2 products. 

NOTE: Landsat Collection 2 Level-2 products can only be produced for Landsat 4-5 TM, Landsat 7 ETM+, and Landsat 8 OLI/TIRS scenes. Landsat MSS 1-5 data cannot be processed into Level-2 products at this time.  

Comparison of Landsat Collection 1 and Collection 2 Surface Reflectance and Surface Temperature Products
  Surface Reflectance Surface Temperature
Data Being Processed to Level-2 Products Landsat 4-8 Landsat 4-8, Landsat 9 (when available) Landsat 4-8 Landsat 4-8, Landsat 9 (when available)
Delivery/Download Scene-based: ESPA On-Demand Interface

Tile-based: EarthExplorer, within U. S. Analysis Ready Data (ARD)

Scene-based: EarthExplorer Tile-based: EarthExplorer, within U.S. Analysis Ready Data (ARD) Scene-based: EarthExplorer
Algorithm Version(s)   LEDAPS: v3.4.0
LaSRC: v1.4.1
  v1.3.0
Fill Value -9999 0 -9999 0
Scaling Factor 0.0001 0.0000275 + -0.2 0.1 0.00341802 + 149.0
Data Type Signed 16-bit integer Unsigned 16-bit integer Signed 16-bit integer Unsigned 16-bit integer
Valid Range 1-10000 1-65455 1500-3730 1-65535
Quality Band Level-2 PIXELQA
Level-2 RADSATQA
Level-2 SRAEROSOLQA
L1 QA_Pixel
L1 QA_RADSAT
L2 SR_QA_AEROSOL
Level-2 PIXELQA Level-2 RADSATQA Level-2 SRAEROSOLQA L1 QA_Pixel L1 QA_RADSAT L2 SR_QA_AEROSOL
Atmospheric Reanalysis Source n/a n/a NARR GEOS-5 FP-IT (2000-pres.)
MERRA-2 (1982-1999)

Landsat Collection 2 Level-2 products require Landsat Collection 2 Level-1 scenes that have been processed to Tier 1 or Tier 2, as well as additional auxiliary data. For Landsat 7, the timeframe from acquisition (Real-Time -RT) to Tier 1 or Tier 2 takes approximately 25-27 days. For Landsat 8 scenes, the timeframe from acquisition (RT) to Tier 1 or Tier 2 takes approximately 15-17 days. 

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