[GRASS-stats] problem with specific type of polygon

[Jarek Jasiewicz]

Roger Bivand pisze:
> On Thu, 9 Apr 2009, Jarek Jasiewicz wrote:
>
>> Hi
>> it is difficult to reproduce on spearfish, because there are no data 
>> like this
>>
>> I vextorised watershed file and at the end of some watershed I have 
>> sutructure like on picture below (rather tipical for watershed):
>>
>>                               |
>>                               |
>>                          +  |                 __________|_
>>                               |_|_
>>                                  |_|_
>>                                     |_|_
>>                                        |_|
>>
>>
>> Addationaly every square on right-down "stream" has his own centeroid 
>> but with the same cateogry like main centeroid
>>
>> I import these data to R with readVECT6 and I have more object than 
>> shoud be, because every square became a separtate vector with his own 
>> attributes (some of atrributes are multipied).
>>
>> In grass I can treat such group as one object by its category number 
>> but in R? How to force R to treat these group of polygons as one obiect
>
> Jarek:
>
> An attempt is made in the code with the remove.duplicates= argument. 
> In addition for polygons, you can try unionSpatialPolygons() in 
> maptools to force the objects belonging together into the same 
> Polygons object.
>
> Hope this helps,
>
> Roger
>
>>
>> Jarek
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>>
>
Yes it is it!

Thank you very much
Jarek