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Thanks, that did the trick. <BR>
<BR>
I guess, in order to get a consecutive "cat", I do have to reclass (v.reclass) the vector- or is there any shortcut?<BR>
<BR>
Sorry for the noise, but vector stuff in grass is still a bit confusing to me.<BR>
<BR>
Cheers, <BR>
<BR>
Stefan<BR>
<BR>
On Fri, 2012-08-17 at 11:38 +0200, Moritz Lennert wrote:
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<PRE>
On 16/08/12 20:23, Stefan Luedtke wrote:
> That helped for my general understanding, thanks a lot, but I can not
> figure out how.
>
> Can anyone just give a few hints on the procedure, basically, how to
> continue after "v.clean", please?
You could try using v.extract with something list list=1-9999 in order
to create a new vector file which contains only those polygons (and
their attributes in the table) which exist in your cleaned file.
Moritz
>
> Cheers,
>
> Stefan
>
> On Thu, 2012-08-16 at 16:29 +0200, Markus Metz wrote:
>> On Thu, Aug 16, 2012 at 1:10 PM, Stefan Luedtke<<A HREF="mailto:sluedtke@gfz-potsdam.de">sluedtke@gfz-potsdam.de</A> <<A HREF="mailto:sluedtke@gfz-potsdam.de">mailto:sluedtke@gfz-potsdam.de</A>>> wrote:
>> > Dear friends,
>> >
>> > I am struggling with the following point.
>> >
>> > I have created a shape of subbasins based on a raster data set. Since this
>> > yields some tiny (pixel size) areas, I run"v.clean" with a certain
>> > threshold to remove/append those artifacts. However, the resulting vector
>> > data set still holds all categories of the old one, even so, some areas have
>> > been removed.
>>
>> This is because several areas can belong to the same category, e.g.
>> basin id, and the category of a deleted area may still be used by
>> another, existing area. BTW, it is not uncommon that one raster basin
>> is represented by several vector areas.
>> >
>> > So my question: How can I update these values that the number of categories
>> > matches the number of areas?
>>
>> You can delete the table and create a new table. Otherwise, entries in
>> the attribute table that are no longer used do not do harm.
>>
>> HTH,
>>
>> Markus M
>>
>> >
>> > I tried v.category (but der is not update function).
>> >
>> > Cheers,
>> >
>> > Stefan
>> >
>> > _______________________________________________
>> > grass-user mailing list
>> > <A HREF="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</A> <<A HREF="mailto:grass-user@lists.osgeo.org">mailto:grass-user@lists.osgeo.org</A>>
>> > <A HREF="http://lists.osgeo.org/mailman/listinfo/grass-user">http://lists.osgeo.org/mailman/listinfo/grass-user</A>
>> >
>
>
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</PRE>
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