[GRASSLIST:5339] Re: [GRASS5] 2 prob.: v.proj and overlapping

[ivan marchesini]

Dear Hamish, dear Radim...., dear all,
a friend of mine, Francesco Mirabella (who is working with me on the
same topics) is answering to your answers about this topics...
I think in few minuts there will be the answer on the list....
thank you very much to both....
ivan




Il giorno gio, 13-01-2005 alle 14:51 +1300, Hamish ha scritto:
> > I've got two problems using grass57....
> > 
> > the first one:
> > I've an area vector map in UTM ED50 system (imported from a shp map)...
> > is a complex map, with a lot of boundary segments and a lot of
> > centroids... but it is quite correct because all the areas seems to
> > answer correcly to v.what.vect... and all boundaries are two areas
> > boundaries... according to v.digit..
> > I've projected it on gauss-boaga roma40 system (an italian system) using
> > v.proj...
> > now only few areas are preserved...(in the gauss-boaga system I mean)
> > and there are a lot of not correct boundaries (no area or 1 area... as
> > v.digit explain...). Consequently, also areas are not respected ....
> > can you explain me the reason of this behaviour... and how to solve the
> > problem??? thank you
> 
> try v.clean, 'v.build error=' on original vector?
> 
> 
>  
> > the second one:
> > importing another map... a shp area map... with v.in.ogr, I have had the
> > message that there are 6 areas overlapping... and that this is recorded
> > in the field (level) 2....
> > the problem is: how can I see which are the areas overlapping?? I tried
> > with v.digit but it doesn't seems to be able to show overlapping
> > areas..... and I have not other ideas...
> > thank you very much for your help....
> 
> d.vect layer=2
> v.extract layer=2
> 
> (fields are now called layers; v.in.ogr messages updated in CVS)
> 
> 
> Hamish
> 
-- 
ivan marchesini <marchesini at unipg.it>