[GRASS-user] internal buffer of polygon

[Markus Neteler]

Hi all,

does anyone have a new(er) trick for negative vector buffers (in GRASS 7)?

thanks
Markus

On Thu, Oct 29, 2009 at 4:59 PM, Milton Cezar Ribeiro
<miltinho.astronauta at gmail.com> wrote:
> 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
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>
>
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