How to Calculate NDVI Index from Sentinel 2 Level 2A Imagery in QGIS

In this video, I have clearly shown the steps required to Calculate NDVI Index from Sentinel 2 Level 2A Imagery in QGIS.
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[@mopisboss1754]

Good job

[@EngineeringTimes]

Great effort

[@chanduneela6474]

The video was Great. But i have a doubt. i am getting different NDVI values for the same sentinal-2 image when calculated in QGIS using raster calculator and ERDAS Imagine. please clarify. Thanks in advance.

[@acinad4605]

Sir I have 4 scenes, how should I compute for the NDVI for the whole study area? Thank you

[@IAKhan-km4ph]

radiometric correction needed in this?

[@yanbensamoun1771]

Sorry does L2A images are sufficient to obtain good ndvi values? I see some people do so king of cloud masking for pixels that are cloudy. Do L2A images need such treatment? thanx

[@NEXTLevelGISRSfitsalem]

Yan Bensamoun The sentinel-2 Level 2A is a BOA reflectance of Level-1C TOA product, so it is corrected for the atmospheric disturbance. For further check the following document:www.researchgate.net/deref/http%3A%2F%2Fstep.esa.int%2Fthirdparties%2Fsen2cor%2F2.4.0%2FSen2Cor_240_Documenation_PDF%2FS2-PDGS-MPC-L2A-SUM-V2.4.0.pdf

[@Alternatives_Universum]

Where is the link for learning how to download the data from COAH?

[@IAKhan-km4ph]

USGS

[@EngineeringTimes]

Have you patreon account? Send me the link plz