

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

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To unsubscribe or access the archives, go to
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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
[hidden email] 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 SophiaAntipolis

You are currently subscribed to cgaldiscuss.
To unsubscribe or access the archives, go to
https://listssop.inria.fr/wws/info/cgaldiscuss


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
 OriginalNachricht 
> Datum: Fri, 08 Aug 2008 14:37:54 +0200
> Von: Mariette Yvinec < [hidden email]>
> An: [hidden email]
> Betreff: Re: [cgaldiscuss] 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
>
> [hidden email] 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 SophiaAntipolis
>
>
>
> 
> You are currently subscribed to cgaldiscuss.
> To unsubscribe or access the archives, go to
> https://listssop.inria.fr/wws/info/cgaldiscuss
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From what I see in wikipedia
there is no relationship between alphashapes and shape file...
and I still don't get what shape you want to get
Andi Jochem wrote:
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
 OriginalNachricht 
Datum: Fri, 08 Aug 2008 14:37:54 +0200
Von: Mariette Yvinec [hidden email]
An: [hidden email]
Betreff: Re: [cgaldiscuss] 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
[hidden email] 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 SophiaAntipolis

You are currently subscribed to cgaldiscuss.
To unsubscribe or access the archives, go to
https://listssop.inria.fr/wws/info/cgaldiscuss

Mariette Yvinec
Geometrica project team
INRIA SophiaAntipolis


Hello, I hope I do not miss completely the point, but I think he wants the polygon that describes the outer (possibly concave) boundary of the alpha shape. Am I right Andi? Kind regards, Bjoern Zehner  Ursprüngliche Nachricht  Von: Mariette Yvinec < [hidden email]> Datum: Freitag, 8. August 2008, 14:59 Betreff: Re: [cgaldiscuss] Boundary of alphashapes An: [hidden email]
> From what I see in wikipedia > there is no relationship between alphashapes and shape file...
> and I still don't get what shape you want to get
> Andi Jochem wrote:
> 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 > > > > >  OriginalNachricht  >
> Datum: Fri, 08 Aug 2008 14:37:54 +0200 > Von: Mariette Yvinec <A href="javascript:main.compose('new','t=Mariette.Yvinec@sophia.inria.fr')"><Mariette.Yvinec@...> > An: <A href="javascript:main.compose('new','t=cgaldiscuss@listssop.inria.fr')">cgaldiscuss@... > Betreff: Re: [cgaldiscuss] 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 > > <A href="javascript:main.compose('new','t=andruit@gmx.de')">andruit@... 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 SophiaAntipolis > > > >  > You are currently subscribed to cgaldiscuss. > To unsubscribe or access the archives, go to > https://listssop.inria.fr/wws/info/cgaldiscuss >
> >
>  > Mariette Yvinec > Geometrica project team > INRIA SophiaAntipolis > > >   Dr. Bjoern Zehner UFZ Centre for Environmental Research LeipzigHalle Permoserstrasse 15 04318 Leipzig Germany http://www.ufz.de/index.php?en=5673 Tel: ++49 (341) 235 3979 Fax: ++49 (341) 235 3939


Hello Mariette,
you are right, there is no relation between alphashapes and shapefiles.
The only thing I want to do, is to write the boundaries which are defined by the set of points into a file.
Or am I totally wrong and alphashapes are not the right method to solve my problem.
Thanks
andi
 OriginalNachricht 
> Datum: Fri, 08 Aug 2008 14:59:14 +0200
> Von: Mariette Yvinec < [hidden email]>
> An: [hidden email]
> Betreff: Re: [cgaldiscuss] Boundary of alphashapes
> From what I see in wikipedia
> there is no relationship between alphashapes and shape file...
>
> and I still don't get what shape you want to get
>
> Andi Jochem wrote:
> > 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
> >
> >
> >
> >
> >  OriginalNachricht 
> >
> >> Datum: Fri, 08 Aug 2008 14:37:54 +0200
> >> Von: Mariette Yvinec < [hidden email]>
> >> An: [hidden email]
> >> Betreff: Re: [cgaldiscuss] 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
> >>
> >> [hidden email] 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 SophiaAntipolis
> >>
> >>
> >>
> >> 
> >> You are currently subscribed to cgaldiscuss.
> >> To unsubscribe or access the archives, go to
> >> https://listssop.inria.fr/wws/info/cgaldiscuss> >>
> >
> >
>
> 
> Mariette Yvinec
> Geometrica project team
> INRIA SophiaAntipolis
>
>
>
> 
> You are currently subscribed to cgaldiscuss.
> To unsubscribe or access the archives, go to
> https://listssop.inria.fr/wws/info/cgaldiscuss
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Thank you Bjoern,
you are right.
Andi
>  OriginalNachricht 
> Datum: Fri, 08 Aug 2008 15:04:57 +0200
> Von: "Björn Zehner" < [hidden email]>
> An: [hidden email]
> Betreff: Re: [cgaldiscuss] Boundary of alphashapes
>
> Hello,
> I hope I do not miss completely the point, but I think he wants the
> polygon
> that describes the outer (possibly concave) boundary of the alpha shape.
> Am
> I right Andi?
> Kind regards,
> Bjoern Zehner
>
>
>  Ursprüngliche Nachricht 
> Von: Mariette Yvinec < [hidden email]>
> Datum: Freitag, 8. August 2008, 14:59
> Betreff: Re: [cgaldiscuss] Boundary of alphashapes
> An: [hidden email]
>
>
>
> > From what I see in wikipedia
> > there is no relationship between alphashapes and shape file...
>
> > and I still don't get what shape you want to get
>
> > Andi Jochem wrote:
> > > 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 > > > > >  OriginalNachricht  >
> > > > Datum: Fri, 08 Aug 2008 14:37:54 +0200 > Von: Mariette Yvinec
> > > < [hidden email]> > An:
> > > [hidden email] > Betreff: Re: [cgaldiscuss]
> 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 > >
> > > [hidden email] 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
> > > SophiaAntipolis > > > >  > You are currently subscribed
> > > to cgaldiscuss. > To unsubscribe or access the archives, go to >
> > > https://listssop.inria.fr/wws/info/cgaldiscuss >
> > > >
>
> >  > Mariette Yvinec > Geometrica project team > INRIA
> SophiaAntipolis > > >
>
>
> 
> Dr. Bjoern Zehner
> UFZ Centre for Environmental Research LeipzigHalle
> Permoserstrasse 15
> 04318 Leipzig
> Germany
> http://www.ufz.de/index.php?en=5673
> Tel: ++49 (341) 235 3979
> Fax: ++49 (341) 235 3939
>

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Depending on the value you are going to choose for alpha,
you can get a whole family of different alphashapes
with different boundaries.
I am not sure that one of them corresponds to
what you are expecting
[hidden email] wrote:
Hello Mariette,
you are right, there is no relation between alphashapes and shapefiles.
The only thing I want to do, is to write the boundaries which are defined by the set of points into a file.
Or am I totally wrong and alphashapes are not the right method to solve my problem.
Thanks
andi
 OriginalNachricht 
Datum: Fri, 08 Aug 2008 14:59:14 +0200
Von: Mariette Yvinec [hidden email]
An: [hidden email]
Betreff: Re: [cgaldiscuss] Boundary of alphashapes
From what I see in wikipedia
there is no relationship between alphashapes and shape file...
and I still don't get what shape you want to get
Andi Jochem wrote:
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
 OriginalNachricht 
Datum: Fri, 08 Aug 2008 14:37:54 +0200
Von: Mariette Yvinec [hidden email]
An: [hidden email]
Betreff: Re: [cgaldiscuss] 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
[hidden email] 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 SophiaAntipolis

You are currently subscribed to cgaldiscuss.
To unsubscribe or access the archives, go to
https://listssop.inria.fr/wws/info/cgaldiscuss

Mariette Yvinec
Geometrica project team
INRIA SophiaAntipolis

You are currently subscribed to cgaldiscuss.
To unsubscribe or access the archives, go to
https://listssop.inria.fr/wws/info/cgaldiscuss

Mariette Yvinec
Geometrica project team
INRIA SophiaAntipolis


But how can I write the boundaries into a file. I would like to have look on the boundaries to be able to decide which is the best alpha for my set of points.
andi
 OriginalNachricht 
> Datum: Fri, 08 Aug 2008 15:41:45 +0200
> Von: Mariette Yvinec < [hidden email]>
> An: [hidden email]
> Betreff: Re: [cgaldiscuss] Boundary of alphashapes
> Depending on the value you are going to choose for alpha,
> you can get a whole family of different alphashapes
> with different boundaries.
>
> I am not sure that one of them corresponds to
> what you are expecting
>
> [hidden email] wrote:
> > Hello Mariette,
> > you are right, there is no relation between alphashapes and shapefiles.
> >
> > The only thing I want to do, is to write the boundaries which are
> defined by the set of points into a file.
> >
> > Or am I totally wrong and alphashapes are not the right method to solve
> my problem.
> >
> > Thanks
> >
> > andi
> >
> >
> >  OriginalNachricht 
> >
> >> Datum: Fri, 08 Aug 2008 14:59:14 +0200
> >> Von: Mariette Yvinec < [hidden email]>
> >> An: [hidden email]
> >> Betreff: Re: [cgaldiscuss] Boundary of alphashapes
> >>
> >
> >
> >> From what I see in wikipedia
> >> there is no relationship between alphashapes and shape file...
> >>
> >> and I still don't get what shape you want to get
> >>
> >> Andi Jochem wrote:
> >>
> >>> 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
> >>>
> >>>
> >>>
> >>>
> >>>  OriginalNachricht 
> >>>
> >>>
> >>>> Datum: Fri, 08 Aug 2008 14:37:54 +0200
> >>>> Von: Mariette Yvinec < [hidden email]>
> >>>> An: [hidden email]
> >>>> Betreff: Re: [cgaldiscuss] 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
> >>>>
> >>>> [hidden email] 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 SophiaAntipolis
> >>>>
> >>>>
> >>>>
> >>>> 
> >>>> You are currently subscribed to cgaldiscuss.
> >>>> To unsubscribe or access the archives, go to
> >>>> https://listssop.inria.fr/wws/info/cgaldiscuss> >>>>
> >>>>
> >>>
> >>>
> >> 
> >> Mariette Yvinec
> >> Geometrica project team
> >> INRIA SophiaAntipolis
> >>
> >>
> >>
> >> 
> >> You are currently subscribed to cgaldiscuss.
> >> To unsubscribe or access the archives, go to
> >> https://listssop.inria.fr/wws/info/cgaldiscuss> >>
> >
> >
>
> 
> Mariette Yvinec
> Geometrica project team
> INRIA SophiaAntipolis
>
>
>
> 
> You are currently subscribed to cgaldiscuss.
> To unsubscribe or access the archives, go to
> https://listssop.inria.fr/wws/info/cgaldiscuss
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Alpha_shape_3 has an output operator to a Geomview_stream
that will let you see the boundary facets with Geomview.
If you don't have Geomview at hand you can look at the code in
CGAL/IO/alpha_shape_geomview_ostream_3.h
and write similar code for another viewer.
Hope this helps.
Mariette
Andi Jochem wrote:
But how can I write the boundaries into a file. I would like to have look on the boundaries to be able to decide which is the best alpha for my set of points.
andi
 OriginalNachricht 
Datum: Fri, 08 Aug 2008 15:41:45 +0200
Von: Mariette Yvinec [hidden email]
An: [hidden email]
Betreff: Re: [cgaldiscuss] Boundary of alphashapes
Depending on the value you are going to choose for alpha,
you can get a whole family of different alphashapes
with different boundaries.
I am not sure that one of them corresponds to
what you are expecting
[hidden email] wrote:
Hello Mariette,
you are right, there is no relation between alphashapes and shapefiles.
The only thing I want to do, is to write the boundaries which are
defined by the set of points into a file.
Or am I totally wrong and alphashapes are not the right method to solve
my problem.
Thanks
andi
 OriginalNachricht 
Datum: Fri, 08 Aug 2008 14:59:14 +0200
Von: Mariette Yvinec [hidden email]
An: [hidden email]
Betreff: Re: [cgaldiscuss] Boundary of alphashapes
From what I see in wikipedia
there is no relationship between alphashapes and shape file...
and I still don't get what shape you want to get
Andi Jochem wrote:
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
 OriginalNachricht 
Datum: Fri, 08 Aug 2008 14:37:54 +0200
Von: Mariette Yvinec [hidden email]
An: [hidden email]
Betreff: Re: [cgaldiscuss] 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
[hidden email] 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 SophiaAntipolis

You are currently subscribed to cgaldiscuss.
To unsubscribe or access the archives, go to
https://listssop.inria.fr/wws/info/cgaldiscuss

Mariette Yvinec
Geometrica project team
INRIA SophiaAntipolis

You are currently subscribed to cgaldiscuss.
To unsubscribe or access the archives, go to
https://listssop.inria.fr/wws/info/cgaldiscuss

Mariette Yvinec
Geometrica project team
INRIA SophiaAntipolis

You are currently subscribed to cgaldiscuss.
To unsubscribe or access the archives, go to
https://listssop.inria.fr/wws/info/cgaldiscuss

Mariette Yvinec
Geometrica project team
INRIA SophiaAntipolis

