CGAL users discussion list

["Andi Jochem" <>]

Hello Mariette,

a shapefile is a popular geospatial vector data format for geographic 
information systems
(http://en.wikipedia.org/wiki/Shapefile)

As you already know, I am not very familiar with alphashapes, but maybe you 
can help me.



I am just looking for a method to get the shape, defined by a set of points 
(the "concave hull" , not the convex hull). After an intensiv google search, 
I found the CGAL library, installed it and tried to write a function using 
alpha_shapes_3.

My question is: How can I get, the shape which is defined by a set of points 
in file?
 

Thanks

Andi




-------- Original-Nachricht --------
> Datum: Fri, 08 Aug 2008 14:37:54 +0200
> Von: Mariette Yvinec 
> <>
> An: 
> 
> Betreff: Re: [cgal-discuss] Boundary of alphashapes

> I am rather familiar with Alpha_shape_3
> but I  can't answer your questions
> because I do not  understand them...
> In particular I don't know
> - what is a shapefile
> - nor which polygon you want to get out of alpha_shapes_3
> - nor what is  a roof plane
> 
> 
>  wrote:
> > Hello,
> > I wrote a function to get the alphashapes of a set of points, but how
> can I
> > transform this alphashapes in a polygon...???
> > Is it posssible to transform the created alphashape in a shapefile???
> >
> > Is anybody familiar with alphashapes?? 
> >
> > Thanks a lot.
> >
> > andi
> >   
> 
> -- 
> Mariette Yvinec
> Geometrica project team
> INRIA  Sophia-Antipolis  
> 
> 
> 
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