Re: [GRASS-user] mosaicing classified images
But the landsat images are of different dates and in some case different years. I found some mosaicing debates here: http://www.faqs.org/faqs/sci/Satellite-Imagery-FAQ/part3/section-14.html 2 schools of thought appear: 1. Mosaic image then classify 2. Classify individual images then mosaic I am following the great grass developer Michael Shapiro's (is he the grass developer?) advice on option 2. On Wed, Jan 21, 2009 at 7:16 PM, Markus Neteler nete...@osgeo.org wrote: On Wed, Jan 7, 2009 at 4:04 AM, maning sambale emmanuel.samb...@gmail.com wrote: Hi, I have a series of classified rasters from different landsat images (various dates). I want to moasic/stitch them to a one raster. The problem is there are subtle differences in the classified output. Any advise in mosaicing them? (I am afraid that it is easier to first mosaic (e.g., with OSSIM), then do the classification...) You could vectorize the raster areas and then try some SQL magic to match close polygons. Also v.clean to remove tiny areas from the map if needed. Markus -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] mosaicing classified images
On Wed, Jan 7, 2009 at 4:04 AM, maning sambale emmanuel.samb...@gmail.com wrote: Hi, I have a series of classified rasters from different landsat images (various dates). I want to moasic/stitch them to a one raster. The problem is there are subtle differences in the classified output. Any advise in mosaicing them? (I am afraid that it is easier to first mosaic (e.g., with OSSIM), then do the classification...) You could vectorize the raster areas and then try some SQL magic to match close polygons. Also v.clean to remove tiny areas from the map if needed. Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] mosaicing classified images
Hi, I have a series of classified rasters from different landsat images (various dates). I want to moasic/stitch them to a one raster. The problem is there are subtle differences in the classified output. Any advise in mosaicing them? -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
