[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. My intention was to test all within 
latest trunk but I gave up after the heavy process broke. I'll probably spend 
more time on it after a month or so.

Thanks, Nikos