Hi, I think you can find a lot of tutorial/cours on the grass website (under Documentation: http://grass.osgeo.org/documentation/tutorials/), on the wiki (http://grasswiki.osgeo.org/wiki/Image_processing) and also on the manual page (http://grass.osgeo.org/grass64/manuals/index.html). There are usually link to the man page for every command, with everything explained ;)
for your job (identify roadways), I think you will mostly be interrested by: - Combined radiometric/geometric (segmentation based) supervised classification (i.gensigset, i.smap) - i.segment (http://grass.osgeo.org/grass70/manuals/i.segment.html) working in grass7 ... Sylvain 2014-01-29 Pedro Camargo <[email protected]> > Thanks, Jiao!! This helps a lot!!! > > > > Pedro > > > > > > *From:* Jiao Wang [mailto:[email protected]] > *Sent:* Tuesday, January 28, 2014 1:02 PM > *To:* Pedro Camargo > *Cc:* GRASS user list > *Subject:* Re: [GRASS-user] Processing NAIP images > > > > Hi Pedro, > > > > I did a test run and created an unsupervised classification image. > > > > Here are the steps I did: > > > > 1 MrSID to tiff in QGIS > > 2 import tiff in GRASS (i.in.gdal) > > 3 create group and subgroup (i.group ---check "Define also sub-group(same > name as group)"--- in the "Layers in selected group" keep one band file as > described in i.cluster manual) > > 4 classification --signature(i.cluster) > > 5 classification--map (i.maxlik) > > > > Hope it helps. > > > > Best, > > Jiao > > > > > > On Tue, Jan 28, 2014 at 9:00 AM, Pedro Camargo <[email protected]> > wrote: > > Hi, > > I am trying to generate land use maps (looking to identify roadways > only, actually) using NAIP imagery. > > Since I am using the pre-compiled GRASS, I do not have MrSID inside > GRASS, so converted the images to TIFF using QGIS. > > I believe I can use i.maxlik or something like that, but I do not > know how to start. It keeps asking for groups, but I do not know what is a > group image. > > > > I googled a lot on this and looked into several tutorials, but still > did not figure out how to start this. I have been educating myself > through a few papers, but I guess I still need to find a good summarized > tutorial on how to do this with multi band images such as NAIP. > > Does anybody have ideas to help? > > Thanks, > > Pedro > > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > > > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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