[GRASS-user] Sentinel2- flooding

[Shane Carey]

Great - thanks all. I'll let you know how I get on.
Thanks

On Sath 8 Noll 2018 at 12:09, Markus Neteler <neteler at osgeo.org> wrote:

> 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
>
-- 
Le gach dea ghui,
*Shane Carey*
*GIS and Data Solutions Consultant*
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