[GRASS5] Vegetation Indices

[Markus Neteler]

On Sun, Mar 14, 2004 at 11:51:16AM +0530, Uttam Kumar wrote:
> Hi GRASS users,
>                         How can I compute Vegetation Indices (like Ratio, 
> NDVI, RVI, TVI, CTVI, TTVI etc.) in GRASS as we can do it in IDRISI. Thanks 
> in advance.

It's failry easy:

NDVI:

 r.mapcalc "ndvi= float( (tm4 - tm3) / (tm4 + tm3 ) )"

Similar to that you can calculate other Vegetation Indices.

Then it is useful to apply a color table with r.colors.

Markus