[GRASS-user] Snap across layers (SOLVED)

[ivan marchesini]

ok...
solved...
the bgmap must be a map of nodes... (I have obtained it with v.to.points
-v)

then all works fine...

thanks



Il giorno mar, 29/01/2008 alle 16.54 +0100, ivan marchesini ha scritto:
> Hi Martin and Luca...
> I have just tried with v.out.ascii as you suggested...
> 
> I have two test vector layer ("pippo" and "pippo1")
> each one contains only one area (without centroid)
> they are really similar and vertex are quite near each other (~30
> meters)
> 
> I have tried these commands:
> 
> v.edit a3 tool=create
> v.out.ascii pippo1 format=standard | v.edit a3 tool=add bgmap=pippo
> thre=200 snap=vertex
> 
> it works but, at the end I obtain only a copy of the first map (i.e.
> "a3" is exactly equal to "pippo1")
> It seems that only "add" works... but not the snap and the threshold...
> 
> any suggestion?
> 
> many thanks
> 
> Ivan
> 
> 
> 
> 
> 
> 
> Il giorno mar, 29/01/2008 alle 15.52 +0100, Martin Landa ha scritto:
> > Hi,
> > 
> > 2008/1/28, Luca Casagrande <luca.casagrande at gmail.com>:
> > > Markus Neteler ha scritto:
> > > > - v.edit does it:
> > > >       bgmap   Name of background vector map(s) snap to
> > > > - the new digitizer in wxgrass does it (not yet enabled by default)
> > 
> > Luca:
> > > Before moving to my data, I am doing some tests with 2 vector layers:
> > >
> > > http://img337.imageshack.us/my.php?image=schermatamapdisplay1vp5.png
> > >
> > > Basically the small one, should snap to the bigger one.
> > > The command line I use is this:
> > >
> > > v.edit map=origine bgmap=destinazione cat=1-999 tool=snap thresh=-1
> > >
> > > But nothing change.
> > >
> > > In the log I have got a lot of line like this, both if i set thresh -1
> > > or 500
> > > [..]
> > > D1/1: Vect_set_thresh(): thresh = 0.000000
> > > [..]
> > >
> > 
> > tool 'snap' in v.edit uses library fn Vect_snap_lines() which doesn't
> > support snapping to the vector features from background map layer.
> > 
> > Snapping mode (no, node, vertex) and background map option works
> > currently only for tool='add'. For now, try to create an empty vector
> > map, export to ascii format the map you want to modify and update the
> > empty map, e.g.
> > 
> > v.edit a3 tool=create
> > v.out.ascii a2 format=standard | v.edit a3 tool=add bgmap=a1 id=1-999
> > thre=500 snap=node
> > 
> > Martin
> > 
-- 
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Ivan Marchesini
Department of Civil and Environmental Engineering
University of Perugia
Via G. Duranti 93/a 
06125
Perugia (Italy)
Socio fondatore GFOSS "Geospatial Free and Open Source Software" http://www.gfoss.it
e-mail: marchesini at unipg.it
        ivan.marchesini at gmail.com
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