About L1C data

I use L1C data with SNAP.

I want detailed information on what kind of processing was performed on L1C data.

Please tell me the site because I could not find it.


I think this link will help you:


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As well as the User Guide page identified by @obarrilero there is also the Technical Guide content:




S2 MPC Operations Manager

Thank you for your reply!

I understand the details!

Is the image of L1C not corrected for atmosphere?

Level-1C is top of atmosphere reflectance
Level-2A is bottom of atmosphere reflectance

Is L2A better if I want to get information on the water surface?

if you want to use multiple images, L2A gives you more comparable data.

Multiple images?

Sorry, I didn’t understand you intentions.

if you want to compare images of different dates, it is advisable to use the calibrated L2A products because their information is corrected for atmospheric conditions.

I understand.

Thank you for the polite explanation.

Is there a site other than this site that can get L2A data for free?

Copernicus Open Access Hub

L2A data will be progressively provided by ESA, but not every scene is already processed.
More information: https://earth.esa.int/web/sentinel/missions/sentinel-2/news/-/article/update-of-copernicus-sentinel-2-level-1c-and-level-2a-processing-baselines

Besides that, you can process L2A products from L1C with sen2cor.

Why doesn’t the process start when I press Run?

you have to install both the plugin and the bundles. Please have a look at the instructions here: Sen2cor (detailled instructions)

about [#5. Create SEN2COR_HOME]

Does folder mean creating a folder named SEN2COR_HOME?
I did so, but couldn’t run Sen2Cor.

no, SEN2COR_HOME is just the name of the variable pointing to the directory where sen2cor is installed.

So what is a new folder?

please specify your question.