Update README.md

README.md

@@ -94,9 +94,10 @@ The Hillshade layer was generated from the DEM using the multidirectional hillsh
      - Tile grid size: 8×8
    - The output was then normalized to the [0, 1] interval
 
-## NDVI
+## Normalized Difference Vegetation Index (NDVI)
 ![image/png](https://cdn-uploads.huggingface.co/production/uploads/651d578a1819d9e5754ffc47/o0AwliWCg5QA6ZlsRGf99.png)
-The NDVI layer was computed from the annual average satellite data covering the Biele Karpaty region.
+The NDVI layer was computed from the annual average satellite data covering the Biele Karpaty region (Sentinel 2 surface reflectance imagery).
+It is used to determine the health and density of vegetation and is computed as a normallized difference of bands B8 (Near-Infrared) and B4 (Visible Red).
 The data in both the <b>raw</b> and <b>processed</b> folders are identical, as no further processing was applied to this layer.
 
 ## Roughness