[GRASS-user] Filling holes in polygons

[Jarek Jasiewicz]

Hamish wrote:
> Jaros³aw Jasiewicz wrote:
>   
>> The problem is simple:
>> If I want to remove small single areas I use v.to.db to upload areas to 
>> database and next extract poligons with area grater than thereeshols
>>
>> But how to perform opposite operation:
>> I have polygnos with some holes. I would like remove the smalllest (not 
>> all)
>>     
>
>
> the task is to remove small holes, correct?
>
> the vector engine can certainly do it, but I don't know what module frontend to
> them could do it. some ideas:
>
> 'v.clean tool=rmarea' may help to remove small areas 
>
> if you could give the holes centroids you could v.clean remove small areas +
> create a error= map, then use v.overlay to wipe out from the original?
> v.dissolve to get rid of left over boundaries (v.distance to set hole's cat
> from nearest area first?)
>
> The SQL approach is interesting.
>
> run v.buffer then see which features disappear?
>
> note GRASS sometimes calls holes in areas "islands".
>
>
> Hamish
>
>
>
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>   
well, it seems that for less than 50 v.digit apper the best solution
thanks for answer
Jarek