Level-2A Processing Overview - Sentinel-2 MSI - Technical Guide - Sentinel Online
Level 2A Processing Overview
The Level-2A operational processor generates, from algorithms of scene classification and atmospheric correction, Level-2A (BOA reflectance) products from Level-1C products.
From the mid-March 2018, the Level-2A became an operational product, beginning with coverage of the Euro-Mediterranean region. Global coverage started in December 2018.