参考文章：

Two different versions of Sen2Cor are available:

Sen2Cor_v2.8 is the latest release supporting Sentinel-2 L1C data generated with the current (14.5) and previous (14.2) Products Specification Document, as input. Sen2Cor_v2.8 release contains new features and improvements respect to Sen2Cor_v2.5.5.

Sen2Cor_v2.5.5 is the previous release and it is needed if the user intends to process old Sentinel-2 L1C data generated with the Products Specification Document older than 14.2 and not reprocessed by ESA.

下载zip，解压后进入文件夹，如图。按shift同时右键选择在此处进入命令行。

sentinel-2 大气校正方法

输入L2A_Process.bat –help，得到如下图所示结果即为成功。下一步即可进行大气校正

Microsoft Windows [版本 10.0.14393]
(c) 2016 Microsoft Corporation。保留所有权利。
C:\Users\Administrator>cd Sen2Cor-02.08.00-win64
C:\Users\Administrator\Sen2Cor-02.08.00-win64>L2A_Process --help
usage: L2A_Process.py [-h] [--mode MODE] [--resolution {10,20,60}]
[--datastrip DATASTRIP] [--tile TILE]
[--output_dir OUTPUT_DIR] [--work_dir WORK_DIR]
[--img_database_dir IMG_DATABASE_DIR]
[--res_database_dir RES_DATABASE_DIR]
[--processing_centre PROCESSING_CENTRE]
[--archiving_centre ARCHIVING_CENTRE]
[--processing_baseline PROCESSING_BASELINE] [--raw]
[--tif] [--sc_only] [--cr_only] [--debug]
[--GIP_L2A GIP_L2A] [--GIP_L2A_SC GIP_L2A_SC]
[--GIP_L2A_AC GIP_L2A_AC] [--GIP_L2A_PB GIP_L2A_PB]
input_dir

Sentinel-2 Level 2A Processor (Sen2Cor). Version: 2.8.0, created: 2019.02.20,
supporting Level-1C product version 14.2 - 14.5.

positional arguments:
input_dir Directory of Level-1C input

optional arguments:
-h, --help show this help message and exit
--mode MODE Mode: generate_datastrip, process_tile
--resolution {10,20,60}
Target resolution, can be 10, 20 or 60m. If omitted,
only 20 and 10m resolutions will be processed
--datastrip DATASTRIP
Datastrip folder
--tile TILE Tile folder
--output_dir OUTPUT_DIR
Output directory
--work_dir WORK_DIR Work directory
--img_database_dir IMG_DATABASE_DIR
Database directory for L1C input images
--res_database_dir RES_DATABASE_DIR
Database directory for results and temporary products
--processing_centre PROCESSING_CENTRE
Processing centre as regex: ^[A-Z_]{4}$, e.g "SGS_"
--archiving_centre ARCHIVING_CENTRE
Archiving centre as regex: ^[A-Z_]{4}$, e.g. "SGS_"
--processing_baseline PROCESSING_BASELINE
Processing baseline in the format: "dd.dd", where
d=[0:9]
--raw Export raw images in rawl format with ENVI hdr
--tif Export raw images in TIFF format instead of JPEG-2000
--sc_only Performs only the scene classification at 60 or 20m
resolution
--cr_only Performs only the creation of the L2A product tree, no
processing
--debug Performs in debug mode
--GIP_L2A GIP_L2A Select the user GIPP
--GIP_L2A_SC GIP_L2A_SC
Select the scene classification GIPP
--GIP_L2A_AC GIP_L2A_AC
Select the atmospheric correction GIPP
--GIP_L2A_PB GIP_L2A_PB
Select the processing baseline GIPP

大气校正步骤如下:
对10m的数据进行大气校正，进入数据所在文件夹下，键入命令：
C:\Users\Administrator\Sen2Cor-02.08.00-win64>L2A_Process.bat --resolution 10 C:\Users\Administrator\Sen2Cor-02.08.00-win64\S2A_MSIL1C_20191005T030601_N0208_R075_T49RFL_20191005T060401\S2A_MSIL1C_20191005T030601_N0208_R075_T49RFL_20191005T060401.SAFE

对所有数据进行大气校正，命令如下：
C:\Users\Administrator\Sen2Cor-02.08.00-win64>L2A_Process C:\Users\Administrator\Sen2Cor-02.08.00-win64\S2A_MSIL1C_20191005T030601_N0208_R075_T49RFL_20191005T060401\S2A_MSIL1C_20191005T030601_N0208_R075_T49RFL_20191005T060401.SAFE
Sentinel-2 Level 2A Processor (Sen2Cor). Version: 2.8.0, created: 2019.02.20, supporting Level-1C product version 14.2 - 14.5 started ...
Product version: 14.5
Operation mode: TOOLBOX
Processing baseline: 99.99
Progress[%]: 0.00 : Generating datastrip metadata
L1C datastrip found, L2A datastrip successfully generated
No resolution specified, will process 20 and 10 m resolution
20 m resolution will be downsampled to 60 m
Progress[%]: 0.09 : PID-11104, L2A_ProcessTile: processing with resolution 20 m, elapsed time[s]: 2.353, total: 0:00:08.932000
Progress[%]: 0.09 : PID-11104, L2A_ProcessTile: start of pre processing, elapsed time[s]: 0.001, total: 0:00:08.933000
Progress[%]: 0.09 : PID-11104, L2A_Tables: start import, elapsed time[s]: 0.044, total: 0:00:08.977000
Progress[%]: 0.11 : PID-11104, L2A_Tables: band B01 imported, elapsed time[s]: 0.281, total: 0:00:09.258000
Progress[%]: 0.27 : PID-11104, L2A_Tables: band B02 imported, elapsed time[s]: 4.137, total: 0:00:13.395000
Progress[%]: 0.46 : PID-11104, L2A_Tables: band B03 imported, elapsed time[s]: 4.832, total: 0:00:18.227000
Progress[%]: 0.66 : PID-11104, L2A_Tables: band B04 imported, elapsed time[s]: 5.062, total: 0:00:23.289000
Progress[%]: 0.79 : PID-11104, L2A_Tables: band B05 imported, elapsed time[s]: 3.494, total: 0:00:26.783000
Progress[%]: 0.87 : PID-11104, L2A_Tables: band B06 imported, elapsed time[s]: 1.903, total: 0:00:28.686000
Progress[%]: 0.94 : PID-11104, L2A_Tables: band B07 imported, elapsed time[s]: 1.940, total: 0:00:30.626000
Progress[%]: 1.02 : PID-11104, L2A_Tables: band B8A imported, elapsed time[s]: 1.908, total: 0:00:32.534000
C:\Users\Administrator\Sen2Cor-02.08.00-win64>

大气校正后：

大气校正之后可在SNAP进行后续的应用，当然也可以在SNAP里针对特定波段进行导出成tif格式，在其他平台例如erdas、envi中进行操作。

SNAP下载：http://step.esa.int/main/download/

Windows 64-Bit	Windows 32-Bit	Mac OS X	Unix 64-bit
Sentinel Toolboxes	These installers contain the Sentinel-1, Sentinel-2, Sentinel-3Toolboxes
Sentinel Toolboxes	Download	Download	Download	Download
SMOS Toolbox	These installer contains only the SMOS Toolbox. Download also the Format Conversion Tool (Earth Explorer to NetCDF) and the user manual.
SMOS Toolbox	Download	Download	Download	Download
All Toolboxes	These installers contain the Sentinel-1, Sentinel-2, Sentinel-3Toolboxes, SMOS and PROBA-V Toolbox
All Toolboxes	Download	Download	Download	Download