[GRASS-user] internal buffer of polygon

[Milton Cezar Ribeiro]

Hi Maning,

Sometimes I have the same issue, but I don't solve this on vector.
Just supose you have a map where 1 is your raster-based-polygon
and NULL is outside of polygon. You can use r.mapcalc to
invert it, in the maner that 1 come to be your non-polygon, and
NULL your polygon. So you can run r.buffer with positive value
and at the end may be you need to do some kind of crossing
between original and output maps.

Bests.

miltinho

2009/10/29 maning sambale <emmanuel.sambale at gmail.com>

> I tried using a negative values as
> buffer=-3000 in v.buffer but it doesn't give me internal buffer in a
> polygon layer.
>
> Any hints?
>
> --
> cheers,
> maning
> ------------------------------------------------------
> "Freedom is still the most radical idea of all" -N.Branden
> wiki: http://esambale.wikispaces.com/
> blog: http://epsg4253.wordpress.com/
> ------------------------------------------------------
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/grass-user/attachments/20091029/c7222309/attachment.html