[GRASS-user] Sentinel2- flooding

[Markus Neteler]

On Fri, Dec 7, 2018 at 8:14 PM Stefan Blumentrath
<Stefan.Blumentrath at nina.no> wrote:
>
> Hi Shane,
>
> Following up on robertos answer:
>
> You could try the Normalized Difference Water Index (NDWI) which is computed for S-2 as:
>
> ndwi = (B08-B11)/(B08+B11)
>
> or alternatively
>
> ndwi = (B03 - B08) / (B03 + B08)
>
> See e.g.: https://github.com/sentinel-hub/custom-scripts/blob/master/sentinel-2/ndwi/script.js

... or just adapt the bands here:

https://grass.osgeo.org/grass74/manuals/i.vi.html#calculation-of-ndvi

> You could also take a look at Sentinel-1 for flooding / water bodies. However, Sentinel-1 would have to be pre-processed in SNAP/gpt.

Yes, Sentinel-1 is probably more relevant when it comes to
identification of flooded areas.

Markus