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How long does it take to create Landsat Collection 2 Level-2 products after a Landsat scene is acquired?

Landsat Level-2 Surface Reflectance and Surface Temperature 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. The Landsat Collection 2 Product Generation Timeline below gives a graphical view of this typical product generation timeframe.  

Landsat Collection 2 Generation Timeline
Landsat 7 and Landsat 8 Level-1 Real-Time scenes are available for download within 4-6 hours after acquisition. For Landsat 7 Level-1 scenes, the timeframe from acquisition (Real-Time) to Tier 1 or Tier 2 takes approximately 24-26 days to allow for application of the refined bumper mode parameters to the Real-Time scene. For Landsat 8 Level-1 scenes it takes approximately 14-16 days to process to a Tier 1 or Tier 2 product while refined Thermal Infrared Sensor (TIRS) instrument line of sight model parameters are applied to the Real-Time scene. Collection 1 Tiers has more information about the Landsat Collections Tier structure.Collection 2 Level-2 Surface Reflectance and Surface Temperature products are typically available within 24 hours after a scene has been processed into Tier 1 or Tier 2. Landsat 7 and Landsat 8 both utilize NASA's Goddard Earth Observing System Model Version 5 Forward Processing for Instrument Teams (GOES-5 FP-IT) Atmospheric Assimilation Products for Level-2 product generation.Upon nominal launch and on-orbit checkout in September 2021, Landsat 9 will deliver Collection 2 Level-1 Tier 1 or Tier 2 scenes within 4-6 hours of acquisition, and a Level-2 Surface Reflectance and Surface Temperature product within 3 days. Landsat 9 will also utilize the GOES-5 FP-IT atmospheric auxiliary data product for Level-2 product generation. 

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