[GRASS-user] V.overlay very slow

[incanus]

Hi all,
I'm trying to join a large set of "vectorial tiles" that i have, into a
unique vectorial map. What i'm doing is something like this, for each "tile"
(in the example is called filaN):

v.overlay ainput=sumaFilas atype=area alayer=1 binput=fila6 btype=area
blayer=1 output=sumaFilas2 operator=or olayer=1,0,0
v.db.addcol map=sumaFilas2 layer=1 'columns=union INTEGER'
v.db.update map=sumaFilas2 layer=1 column=union value=1 
v.dissolve input=sumaFilas2 output=sumaFilas2 layer=1 column=union
--overwrite
g.remove vect=sumaFilas
g.rename vect=sumaFilas2,sumaFilas

At first, the v.overlay is instant, but when processing the map number 100,
it can be several hours.

Anyone knows an alternate way to do this?
The first solution I adopted was making this by rows of 100 "tiles", and
then joining the rows (what i'm doing in the example above). It worked for
me since i only has todo a "small" map (1 week of processing), but now i
need to do one MUCH more big.

Thanx in advance if anyone knows something.. or not :)
Andres
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