On Mon, 2008-03-03 at 13:40 +0200, [EMAIL PROTECTED] wrote: > Hello all,
Hi! > > I'm a very new GRASS user, me as well ;-) > and I hope this matter hasn't been discussed many times before. (And > I hope this message doesn't arrive to you many times: I've tried > sending it two times so far, and with no success. Now I'm trying from > my work address, let's see if this helps.) > > I'm using GRASS 6.3 and I'm having some trouble with the i.class > module. I've learned to go around the first problem, but not the other > one, and it has halted my work now. > > The first problem arises if I try to start i.class by just typing > "i.class" into the command line. I am queried for the raster map I > want to obtain the signatures from, and then the image group, and so > far all is well. But when I'm queried for the image subgroup, the > subgroup I give is never OK, and if I type "list" for the available > subgroups, there never seem to be any subgroups in my image group. I > have created the appropriate image groups and subgroups using i.group, > and have used them succesfully with other > applications, so the subgroup should be there. However, the i.class > doesn't see it, at least not when I start it that way. > > I can go around this problem, if I specify the group and subgroup > already when calling i.class, i.e. if I type > > i.class map="name" group="name" subgroup="name" outsig="name" > > Then the graphic window opens up nicely and I can specify the training > regions. But then another trouble comes along. > > After I've selected and saved and named all my training regions, and > exited i.class, all seems to be OK, and signature file is saved. But > when I start i.maxlik and try to use the created signature file for > classifying, I get the error message: > > ERROR: Can't read signature file [signature]. Not sure if I can help. Just some ideas: 1. You enter always the same LOCATION in which you created the signatures? 2. Read/Write/Execute permissions for your GIS-DB ok? 3.Subgroup needs more than 1 raster map to work with i.maxlik > > When I run i.maxlik with a signature file created by i.cluster, I > don't have any problems. Why can't I open the signature I've created > with i.class? I can see the signature file listed under /subgroup/sig/ > so it has been created, it just can't be accessed by i.maxlik. I've > tried again and again, I've tried saving the signature with different > names etc. and I always get the same error message. > > I would greatly appreciate any help in this matter! Thank you so much > in advance! > > Yours, > > Paula Sankelo > > PS: I love GRASS, I'm so happy I found it! This is the first serious > trouble I've run into so far. > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user