[GRASS-user] speeding up v.clean for large datasets

[Markus Neteler]

On Fri, Apr 19, 2013 at 10:07 AM, Markus Metz
<markus.metz.giswork at gmail.com> wrote:
> On Fri, Apr 19, 2013 at 9:06 AM, Mark Wynter <mark at dimensionaledge.com> wrote:
...
>> Alternatively, has anyone found a way to speed up v.clean for large network datasets?
>
> Yes, implemented in GRASS 7 ;-)
>
> Also, when breaking lines it is recommended to split the lines first
> in smaller segments with v.split using the vertices option. Then run
> v.clean tool=break. After that, use v.build.polylines to merge lines
> again. Or use in GRASS 7 the -c flag with v.clean tool=break
> type=line. The rmdupl tool is then automatically added, and the
> splitting and merging is done internally.

Added to

http://grasswiki.osgeo.org/wiki/Vector_topology_cleaning

markusN