[GRASS-user] Is Watershed image segmentation program in GRASS GIS?

Leonardo Hardtke leohardtke at gmail.com
Wed Nov 11 08:48:56 PST 2015


Hi there...

I used r.grow to segment dNBR images to map wildfires. See:


https://www.researchgate.net/publication/269692754_Semi-automated_mapping_of_burned_areas_in_semi-arid_ecosystems_using_MODIS_time-series_imagery

Hope it helps...


2015-11-11 3:47 GMT-03:00 Uttam Kumar <uttamsinha09 at gmail.com>:

>
>
> Hi All,
>
> Is watershed image segmentation program or a similar module available in
> GRASS GIS?
>
> I understand that we have r.watershed, i.segment and r.grow in GRASS GIS.
> But I do not know which one best suits my problem.
>
> The problem is:
>
> I have two layers of raster data -
> 1.) a gradient image (obtained by applying a 3 x 3 sobel filter on a water
> index using r.mapcalc), and
> 2.) a seed image of 2 classes labelled as "1" and "2" and remaining pixels
> as "0".
>
> I want to use the seed image and the gradient image (which shows direction
> of change in intensity) information to perform segmentation using the
> watershed algorithm and label all "0" pixels as either 1 or 2.
>
> r.watershed does not use watershed segmentation algorithm. i.segment is
> something close but I am not sure.
>
> Please suggest.
>
> Any comment is appreciated.
>
> Uttam.
>
>
>
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>



-- 
Dr. Leonardo A. Hardtke
Laboratorio de Teledetecci├│n y S.I.G.
Centro Nacional Patag├│nico (CONICET)
Bvd. Brown 2825, 9120
Puerto Madryn, Chubut, Argentina
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