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.

Hi,

I think this link will help you:

https://sentinel.esa.int/web/sentinel/user-guides/sentinel-2-msi/processing-levels/level-1

1 Like

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

https://sentinel.esa.int/web/sentinel/technical-guides/sentinel-2-msi/level-1c-processing

Cheers

Jan

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
https://scihub.copernicus.eu/dhus/#/home

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.