[Gvsig_english] "bleeding" polygon themes and how to repair them

[Micha Silver]

Wolfgang Qual wrote:
> Dear developers,
> I think you know that problem: a polygon theme has some polygons those 
> boundary is not perfectly closed. Thus, when opening that layer, the 
> polygon "bleeds to death" - the whole view gets coloured.
> Well, I just had this to happen - in ArcView 3.2.
>   
I believe that the shapefile spec requires that area shapes be created 
in a clockwise direction. So that as you "walk" around the area, inside 
is always to your right.
If an area is created in reverse (by GPS or digitizing) then in Arcview 
3.2 you'll see the whole map colored, as you described.

Sometimes you can fix badly made shapes by just saving as a new 
shapefile. In addition there are some shapefile repair tools out there 
that will sometimes overcome this problem.


Good luck...
Micha
> When opening the same layer in gvSIG, nothing happened. This is strange, isn't 
> it? Is the vector layer defect or not?
> Now, I am in a "catch 22" situation: which program is telling a lie? gvSIG's 
> or ArcView (you will say "AV of course", grinning... ) 
> In order to find out the truth, I would like to ask you, whether gvSIG will 
> provide once a possibility to find out defect geometries. It would be really 
> great, if such a tool would be available in the future. This tool would be 
> even better, if it would not just repair a layer, but (before) tell the user 
> where the problems lie (for example by selecting the defect polygons 
> graphically). Otherwise, everything is a blackbox to me.
>
> All the best,
> Wolfgang
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