[GRASSLIST:5326] Re: [GRASS5] 2 prob.: v.proj and overlapping

[Hamish]

> 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