[Freegis-list] polygonize a set of lines

[GISuser.com - Glenn]

FYI,
See also the translators and tools provided at GISuser.com - free tools
section - there's about 500 apps (translators etc...) listed


PS: those geocomm translators are pretty old by now (I know as I put
them there about 7 years ago before I jumped ship!)

Regards
Glenn



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Glenn Letham 
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> -----Original Message-----
> From: freegis-list-bounces at intevation.de 
> [mailto:freegis-list-bounces at intevation.de] On Behalf Of Brent Wood
> Sent: Thursday, January 25, 2007 10:37 AM
> To: Eduardo Patto Kanegae; freegis-list at intevation.de
> Subject: Re: [Freegis-list] polygonize a set of lines
> 
> 
> 
> --- Eduardo Patto Kanegae <epk.lists at gmail.com> wrote:
> 
> > Hi folks,
> > 
> > I have a CAD line layer describing the limits of a soil map. It's a 
> > line layer because the first need was for printing only.
> > 
> > Now I need to put this soil map as a polygon into a GIS dataset.
> > 
> > Does anybody recommend any free gis tool that could be 
> usefull to do 
> > that?
> 
> Hi Eduardo,
> 
> 
> I haven't tried it, but I believe GRASS has some capabilities 
> in this area, once you convert the CAD data to a supported format.
> 
> You could try PostGIS, if you can get your data into a 
> postgis table somehow, there are commands to do this. 
> 
> For an Open Source (Windows) tool to do the conversion to 
> shapefile, try 
> http://www.happysquirrel.com/index.php?feature=dxf2shp
>   or see
> http://software.geocomm.com/translators/cad-dxf/
> 
> In PostGIS, see
> 
http://postgis.refractions.net/docs/ch06.html#id2843565

The functions polygonize, makepolygon & buildarea can probably do what
you want.



You may also find something useful at 

http://software.geocomm.com/topology/


HTH,

  Brent Wood

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