[GRASS-dev] About v.distance, v.what.vect (wrt "count points within...").

[Nikos Alexandris]

Nikos Alexandris wrote:
> > > "v.distance" is slow (for the impatient user) with very large vectors
> > > (from my memory I estimate that it took ~20h for ~600.000 features).
> 
> (+some details: Kubuntu 64-bit on Intel Core2 Duo T9400  @2.53GHz)
 
> > > Trying to get the "dmax=" first in order to tell "v.distance" to look
> > > for features within a certain radius, might _not_ be very efficient as
> > > well. It takes time to get results from "v.distance -pa" and, depending
> > > on the vector(s), the addition of the _real_ v.distance can be a
> > > deal-breaker.
 
Moritz L:
> > Just an innocent question (partly directed to Markus M): could this be
> > linked to the spatial index ? And is v.distance faster with spatial
> > index on file in grass7 ?
> > 
> > Which version are you using ?
> 
> Hmm... right, I am using latest 64-svn.

+sqlite.

Nikos