SNAP Tutorial


#1

Dear all,

Could anyone here share me a tutorial how to process Sentinel-2 data ?

I prefer to have a written tutorial , not video??

Thanks


#2

The general way of processing is independent of the sensor.
If you want to do bulk processing on the command line you can have a look at these two pages:

If you want to do processing in the desktop application, I only know the videos.


#3

Sentinel-2 data is nearly ready to use, my question is what you undestand of ‘processing’ and what you want to do with the images.


#4

Dear Jigme Tenzin,

In the frame of the ESA Land Training Course 2018, I have generated a tutorial in PDF to calculate water change (based on NDWI2) and forest change (based on NBR) detection using Sentinel-2 data.
In this document is explained how to open a S2 product, how apply BandMath and how to generate a Graph.

The document for the moment is freely available at http://eoscience.esa.int/landtraining2018/files/materials/D2B4_ESA-LTC2018-Practical_day2_RAMOINO.pdf but I will upload soon on STEP Tutorial section.

Best Regards,
Fabrizio


#5

Thank you very much.


#6

Basically I am trying to apply radiometric and geometric correction to Sentinel -2 L1C product using SNAP. I am not sure do I really need to calibrate radiometrically like we do in LandSAT ?

Since my study area is a mountainous region, so we need to apply topographical correction using DEM? I am confused how do we validate the correction is applied ?

From your statement, what I understood is that we dont need to apply those sort of corrections?


#7

Thank you very much for sharing the documents.

Do we need to apply radiometric ( radiometric calibration and atmospheric correction) and geometric for Sentinel- 2 to be used for LULC mapping?

Kindly enlighten on these two correction , please?


#8

If available, you can download L2A products which are already radiometrically corrected.

sen2cor uses a DEM to reduce topographically induced radiometric distortions. The geometric accuracy of Sentinel-2 is quite fine, no orthorectification is usually needed.
Here you can read about the geometric quality requirements: https://earth.esa.int/web/sentinel/technical-guides/sentinel-2-msi/performance

You can also have a look at the chapter “4 Anomalies” in the S2 Data quality report: https://sentinel.esa.int/documents/247904/685211/Sentinel-2_L1C_Data_Quality_Report
It lists which orbits and products are affected by geolocation errors.


#9

Dear Fabrizio_Ramoino,
Your tutorial in PDF format is of great valuable. Thank you very much!
I hope more PDF tutorials and algorithm ATBDs can share in this forum.


#10

Big thanks and looking forward to interact more.