[GRASS-user] detection of landscape features from landsat

[Kenneth Brookes]

Hi Timmie

I am not very familiar with GRASS GIS either but I’m trying to learn.
However, GRASS does have the tools to perform multi-spectral image
classification. Performing unsupervised classification and then isolating
the classified pixels that appear to represent the spectral signature of
“water” (keeping in mind that several classes of pixels may have to be
grouped due to such factors as turbidity) you should be able to create a
classified raster map for “water”. Once satisfied with the results of the
classification and after isolating the “Water” class you can convert the
raster map to a vector map using r.to.vect.  Once completed you should have
a reasonable “Water Body” vector layer.

Kenneth Brookes


Timmie wrote:
> 
> Hello,
> I aim to delineate landscape features -- especially water bodies -- from 
> Landsat imagery.
> 
> There was a publication where this was conducted with ArcSDE & Oracle at 
> [1].
> 
> My question: has anyone tried such a task with GRASS?
> Which combination of tools/commands lead to the best results?
> 
> Please share your experience.
> 
> Thanks in advance,
> Timmie
> 
> [1] Automatic delineation of shoreline and lake boundaries
> from Landsat satellite images
> 
> Stefano Bagli and Pierre Soille
> Joint Research Centre of the European Commission
> Institute for Environment and Sustainability - Land Management Unit
> via E. Fermi 1, Ispra, Italy
> http://www.gisig.it/eco-imagine/full%20papers/bagli-soille2004eipaper.pdf
> 
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
> 
> 

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