[Freegis-list] Voronoi

[Thanh Le Phuoc]

Dear Paul,

As my knowledge, Voronoi used for creating TIN (Triangle Irigular Network)
in GIS. This is a function of some GIS system, with this, you can creat 3D,
or vitural terrain, contour interpolation...

Best regards,
Thanh Le Phuoc

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Today's Topics:

   1. Re: OT: Voronoi (Adrian Custer)
   2. Re: OT: Voronoi (Paul Selormey)
   3. Re: OT: Voronoi (Markus Neteler)
   4. Re: OT: Voronoi (Paul Selormey)

--__--__--

Message: 1
Subject: Re: [Freegis-list] OT: Voronoi
From: Adrian Custer <acuster at nature.berkeley.edu>
To: Paul Selormey <paul at toolscenter.org>
Cc: FreeGIS list <freegis-list at intevation.de>
Date: 22 Jul 2002 13:18:17 -0700

Yours is way too vague a question.

They are used extensively in all sorts of GIS applications, and in the
algorithms used to do internal geometric calculations. Indeed, since
they are a fundamental mathematical construct, it would be hard to make
any GIS that did not in some way use them.

good luck,
adrian

On Sun, 2002-07-21 at 22:01, Paul Selormey wrote:
> Hello All,
>
> Just seeking knowledge. Anyone here uses Voronoi in GIS application?
> What is the relevance of this or where/when is this used in GIS?
>
> Best regards,
> Paul.
>
>
>
> _______________________________________________
> Freegis-list mailing list
> Freegis-list at intevation.de
> https://intevation.de/mailman/listinfo/freegis-list
>




--__--__--

Message: 2
From: "Paul Selormey" <paul at toolscenter.org>
To: "Adrian Custer" <acuster at nature.berkeley.edu>
Cc: "FreeGIS list" <freegis-list at intevation.de>
Subject: Re: [Freegis-list] OT: Voronoi
Date: Tue, 23 Jul 2002 09:23:35 +0900

> Yours is way too vague a question.

Hmmm, may be I will have asked a better question if I knew
what it is.

> They are used extensively in all sorts of GIS applications, and in the
> algorithms used to do internal geometric calculations. Indeed, since
> they are a fundamental mathematical construct, it would be hard to make
> any GIS that did not in some way use them.

I have seen many GIS applications in the forum, and on the freegis.org
pages.
However, I am yet to find one which really uses the Voronoi algorithm. I
came
across this while reading the "dying" GFC library, and wishes to know more.
In fact, neither OpenEV, MapServer etc are using it so by your write up you
do not consider these are GIS applications?

Please, I really need the help - which open source systems are using this
algorithm
so that I could find out more?

Best regards,
Paul.




--__--__--

Message: 3
Date: Tue, 23 Jul 2002 09:49:47 +0200
From: Markus Neteler <neteler at itc.it>
To: Paul Selormey <paul at toolscenter.org>
Cc: Adrian Custer <acuster at nature.berkeley.edu>,
	FreeGIS list <freegis-list at intevation.de>
Subject: Re: [Freegis-list] OT: Voronoi

On Tue, Jul 23, 2002 at 09:23:35AM +0900, Paul Selormey wrote:
> > Yours is way too vague a question.
>
> Hmmm, may be I will have asked a better question if I knew
> what it is.
>
> > They are used extensively in all sorts of GIS applications, and in the
> > algorithms used to do internal geometric calculations. Indeed, since
> > they are a fundamental mathematical construct, it would be hard to make
> > any GIS that did not in some way use them.
>
> I have seen many GIS applications in the forum, and on the freegis.org
> pages.
> However, I am yet to find one which really uses the Voronoi algorithm. I
> came
> across this while reading the "dying" GFC library, and wishes to know
more.
> In fact, neither OpenEV, MapServer etc are using it so by your write up
you
> do not consider these are GIS applications?
>
> Please, I really need the help - which open source systems are using this
> algorithm
> so that I could find out more?

Hi,

GRASS is providing "s.voronoi":
http://grass.itc.it/gdp/html_grass5/html/s.voronoi.html

former versions were also providing "v.geom" but due to
license problems this code was removed from GRASS.

Source code is here:
http://freegis.org/cgi-bin/viewcvs.cgi/grass/src/sites/s.voronoi/
(or you download the full source code)

Hope this helps,

 Markus


--__--__--

Message: 4
From: "Paul Selormey" <paul at toolscenter.org>
To: "Markus Neteler" <neteler at itc.it>
Cc: "Adrian Custer" <acuster at nature.berkeley.edu>,
	"FreeGIS list" <freegis-list at intevation.de>
Subject: Re: [Freegis-list] OT: Voronoi
Date: Tue, 23 Jul 2002 17:33:49 +0900

Hello Markus,
Thanks so much for the information.

Best regards,
Paul.

----- Original Message -----
From: "Markus Neteler" <neteler at itc.it>
To: "Paul Selormey" <paul at toolscenter.org>
Cc: "Adrian Custer" <acuster at nature.berkeley.edu>; "FreeGIS list"
<freegis-list at intevation.de>
Sent: Tuesday, July 23, 2002 4:49 PM
Subject: Re: [Freegis-list] OT: Voronoi


> On Tue, Jul 23, 2002 at 09:23:35AM +0900, Paul Selormey wrote:
> > > Yours is way too vague a question.
> >
> > Hmmm, may be I will have asked a better question if I knew
> > what it is.
> >
> > > They are used extensively in all sorts of GIS applications, and in the
> > > algorithms used to do internal geometric calculations. Indeed, since
> > > they are a fundamental mathematical construct, it would be hard to
make
> > > any GIS that did not in some way use them.
> >
> > I have seen many GIS applications in the forum, and on the freegis.org
> > pages.
> > However, I am yet to find one which really uses the Voronoi algorithm. I
> > came
> > across this while reading the "dying" GFC library, and wishes to know
more.
> > In fact, neither OpenEV, MapServer etc are using it so by your write up
you
> > do not consider these are GIS applications?
> >
> > Please, I really need the help - which open source systems are using
this
> > algorithm
> > so that I could find out more?
>
> Hi,
>
> GRASS is providing "s.voronoi":
> http://grass.itc.it/gdp/html_grass5/html/s.voronoi.html
>
> former versions were also providing "v.geom" but due to
> license problems this code was removed from GRASS.
>
> Source code is here:
> http://freegis.org/cgi-bin/viewcvs.cgi/grass/src/sites/s.voronoi/
> (or you download the full source code)
>
> Hope this helps,
>
>  Markus
>




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