[GRASS5] filtering vector areas

[Radim Blazek]

> On Sunday 20 June 2004 17:38, Otto Dassau wrote:
> > Then there is the implemented sides option for v.to.db by Radim. I tried
> > this but I don't understand how to use this option because I don't know
> > what this option is for - sorry :-(
> >
> >  sides - categories of areas on the left and right side of the boundary,
> > 'qfield' is used for area category.
> >
> > Radim, could you please give an example what this option os for? Maybe
> > this is a solution but I don't see it.
>
> You can identify the boundaries which have to be removed from the vector in
> SQL if you have: area type, area size, boundary length, area on the
> left/right side of the boundary. Whithout 'sides' option in v.to.db, it was
> impossible to get area on the left/right side of the boundary.

I added also new tool=rmarea to v.clean, which removes small areas.
If you need to keep small areas of certain category, you can do
v.extract; v.clean tool=rmarea; v.patch; v.clean tool=rmdupl

Previous suggestion (v.to.db + SQL) is still valid however.

Radim