The Normalized Difference Water Index (NDWI) is used for agricultural monitoring of drought and irrigation management.

The equation is: (NIR - SWIR) / (NIR + SWIR)

For Sentinel you can use NIR = Band 8 and SWIR = Band 11

• Add NDWI calculation to the script of Exercise 4.1
• Apply all indices of Exercise 4.1 + NDWI to your own study area

Please submit the link to the code.