Hi Leonardo, I went through the paper " Semi-automated_mapping_of_burned_areas_in_semi-arid_ecosystems_using_MODIS_time-series_imagery <https://www.researchgate.net/publication/269692754_Semi-automated_mapping_of_burned_areas_in_semi-arid_ecosystems_using_MODIS_time-series_imagery>" and I am also trying to do something similar except that I want to separate water bodies.
Is it possible for you to share the GRASS code on segmentation (based on Pratt, W.K., 2001. Digital Image Processing. NY: Wiley-Interscience, New York, pp. 491–556.) which you executed as an ad hoc function in r.mapcalc. Appreciate any help. Uttam. On Wed, Nov 11, 2015 at 8:48 AM, Leonardo Hardtke <leohard...@gmail.com> wrote: > 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 <uttamsinh...@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. >> >> >> >> _______________________________________________ >> grass-user mailing list >> grass-user@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/grass-user >> > > > > -- > Dr. Leonardo A. Hardtke > Laboratorio de Teledetección y S.I.G. > Centro Nacional Patagónico (CONICET) > Bvd. Brown 2825, 9120 > Puerto Madryn, Chubut, Argentina >
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