Great thanks On Aoine 7 Noll 2018 at 19:14, Stefan Blumentrath < stefan.blumentr...@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 > > > > 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. > > > > Cheers > > Stefan > > > > *From:* grass-user <grass-user-boun...@lists.osgeo.org> *On Behalf Of *Shane > Carey > *Sent:* fredag 7. desember 2018 17:35 > *To:* roberto.marzoc...@gmail.com > *Cc:* grass-user grass-user <grass-user@lists.osgeo.org> > *Subject:* Re: [GRASS-user] Sentinel2- flooding > > > > Ok, thanks. > > Le gach dea ghui, > > *Shane Carey* > > *GIS and Data Solutions Consultant* > > > > > > On Fri, Dec 7, 2018 at 2:45 PM Roberto Marzocchi < > roberto.marzoc...@gmail.com> wrote: > > I Think there isn't any tool pre-configured. You need to find an index to > calculate "flooded" cells and then you can simply use r.mapcalc > > > > R > > > > Il giorno ven 7 dic 2018 alle ore 14:45 Shane Carey <careys...@gmail.com> > ha scritto: > > Hi, > > > > I've obtained an image from sentinel2 where it shows flooding. Just > wondering are there tools in Grass to classify an image in order to pull > out these "flooded" pixels? > > > > Thanks > > -- > > Le gach dea ghui, > > *Shane Carey* > > *GIS and Data Solutions Consultant* > > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/grass-user > > -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant*
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