My results showed significant differences between years but how can I explain it using NDVI values?
First of all you need to delineate each area you want to compare, after that you just need to select a spectral index and compare the variation. You could see similar methodology here:
https://www.sciencedirect.com/science/article/pii/S0341816218303874#!
I hope this will help you
Furthermore, similar methodologies have been applied but instead of using remote sensing to discriminate different forests, it was used to show the variation in vegetation between the different mountain landforms.
Article NDVI, 137Cs and nutrients for tracking soil and vegetation d...
Dear
Normalized difference vegetation index (NDVI) is extracted from the red and Near infrared bands commonly in all satellites, such as Landsat family , sentinel family and planetary .
NDVI =(Red - NIR)/(Red+NIR)
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