NDWI Index Interpretation

[mat.d.lenihan]

Hi

I’ve added a custom index - NDWI ( (Green – NIR)/(Green + NIR)) to look at leaf water content correlated to the surface model image and NDRE but I’m having trouble interpretating it with my use case.

Can you tell me why the values created are showing soil areas as more “Aquarius” and healthy plant vegetation areas as “high drought” zones.?

Its almost like I need the values inverted?

If anyone could shed some light on this it would be greatly appreciated.

[Ag-er-products-support]

Hi Mat,
The formula you are using is useful if you want to assess changes related to water content in water bodies, not to evaluate water content of leaves. In this case you should use: (NIR-SWIR )/(NIR +SWIR).
Kind regards.