[GRASS-user] Reorg cat entry?

GRASS GRASS user
1

Hi,

I have performed the following steps on raster A:

vectorize(A) --> clean by removing small areas --> rasterize back

Now I have cats with large "gaps" and not starting by 0, hence an expanded range
of cats. How can "reorg" so that range starts at 0 with step=1?

Thanks a lot!

Regards,
Christian.

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2

On Thu, 2008-07-17 at 11:59 +0200, Christian Schwartze wrote:

Hi,

I have performed the following steps on raster A:

vectorize(A) --> clean by removing small areas --> rasterize back

Now I have cats with large "gaps" and not starting by 0, hence an expanded range
of cats. How can "reorg" so that range starts at 0 with step=1?

Thanks a lot!

Regards,
Christian.

Hi Christian!

If removing small areas is your target why not use r.reclass.area?

Kind regards,
Nikos

3

Thanks Nikos,

I use v.clean instead because so I am sure that the eleminated areas are
relocated to neighbours with longest bounds. With r.reclass.area the min areas
get lost, right? But nevertheless the cats would start at 0 and increases by 1
when using r.reclass.area?

Regards,
Christian.

Zitat von Nikos Alexandris <nikos.alexandris@felis.uni-freiburg.de>:

On Thu, 2008-07-17 at 11:59 +0200, Christian Schwartze wrote:
> Hi,
>
> I have performed the following steps on raster A:
>
> vectorize(A) --> clean by removing small areas --> rasterize back
>
> Now I have cats with large "gaps" and not starting by 0, hence an expanded
range
> of cats. How can "reorg" so that range starts at 0 with step=1?
>
> Thanks a lot!
>
> Regards,
> Christian.

Hi Christian!

If removing small areas is your target why not use r.reclass.area?

Kind regards,
Nikos

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4

Christian Schwartze pisze:

Hi,

I have performed the following steps on raster A:

vectorize(A) --> clean by removing small areas --> rasterize back

Given the v.clean output name is "cleaned":

v.category in=cleaned out=cleaned_rmc opt=del
v.category in=cleaned_rmc out=cleaned_rmc_adc opt=add

Maciek

--
Maciej Sieczka
www.sieczka.org

5

Thank you Maciej,

it solves the task in this way that the cats are gap-less now, but still starts
with x>>0. And the label column get lost.

Regards,
Christian.

Zitat von Maciej Sieczka <tutey@o2.pl>:

Christian Schwartze pisze:
> Hi,
>
> I have performed the following steps on raster A:
>
> vectorize(A) --> clean by removing small areas --> rasterize back

Given the v.clean output name is "cleaned":

v.category in=cleaned out=cleaned_rmc opt=del
v.category in=cleaned_rmc out=cleaned_rmc_adc opt=add

Maciek

--
Maciej Sieczka
www.sieczka.org

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