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I calculated seasonal NDVI Time series (1 image for each season) from 2017 to 2022 using Sentinel-2 L1C images (which I converted to L2A using Sen2Cor), the first 5 years where ok, but the last 3 seasons of 2022 didn't follow the same seasonality, the same problem occured in 3 different study regions.

What could it be?

This is the time series:

image

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  • Did you take into account the changes in the processing baseline that took place in January 2022? sentinels.copernicus.eu/web/sentinel/technical-guides/…
    – HMSP
    Feb 28, 2023 at 15:35
  • @HMSP I used sen2cor ver 2.11 for all images I didn't specify the baseline and I don't know how, to prevent the non hamonization of images I downloaded all images as L1C ans converted it all with the same tool
    – FF123456
    Feb 28, 2023 at 15:49

1 Answer 1

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If you are using Google earth engine then u may need to use Harmonized data which takes into account the processing baseline changes into account. the snippet--‘COPERNICUS/S2_SR_HARMONIZED’

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