[GRASS-user] Remove island

[Maciek Sieczka]

On Thu, 18 May 2006 22:19:57 +0200
Yves Jacolin <yjacolin at free.fr> wrote:

> Hello,
> Thanks for your help. I am wondering if my layer is correct! I try
> v.extract -d input=visibilite output=visibilite_correct list=1-99999,
> nothing change ! Furthermore, if I choose to fill area by a "random
> fills  colors for each cat values", 'islanf' are emtpy. When I export
> by v.out.org and use -c options in shapefile, qgis display the layer
> correctly.
> 
> If I query the raster layer just before vectorisation, I obtain a
> 'good' answer for polygons (ie, cat value displayed) and for island I
> just obtain an empty windows, but the boundary is selected in the
> screen... Acutally I don't understand how polygons are managed in
> Grass. I thank that I read such subject in the past in this list, but
> I am maybe wrong.

area = boundary (no category needed) + centroid

Area atrributes are "physically" assigned to a centroid.

Hope this helps.

Best,
Maciek

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