[GRASS-user] patching vectors - some are not patched

[Markus Metz]

On Mon, Nov 19, 2018 at 12:20 PM Ken Mankoff <mankoff at gmail.com> wrote:
>
> Hi List,
>
> On 2018-11-19 at 08:26 +0100, Ken Mankoff <mankoff at gmail.com> wrote:
> > I'm having trouble getting v.patch to patch some vectors. I've tested
> > this on Linux grass 7.4.0 (default Ubuntu 18.04 version) and SVN trunk
> > from this evening.
>
> It appears I can get the patched vectors to work by using v.clean. In
this way, the "basin" vector accumulates the "b" vectors generated from the
"basin" raster.
>
> r.mapcalc "basin = if(basin, ${count}, null())" --o
> r.to.vect -v input=basin output=b type=area --o
> v.patch -a input=b output=basin --o
> v.clean in=basin out=basin_clean0 tool=break,rmdupl --o
> v.clean in=basin_clean0 out=basin_clean1 tool=snap,break,rmdupl --o

you can also clean the patched vector with

v.clean tool=bpol,rmdupl,break,rmdupl -c

it could be a bit faster

Markus M

> g.rename vector=basin_clean1,basin --o
>
>   -k.
>
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