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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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [email protected]
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