Re: polygonize a set of lines

I would also like to mention our open source software "Dxf2PostGIS".

Description:
A tool to convert DXF files to PostGIS geometry tables. A single DXF 
file is converted to a PostgreSQL/PostGIS SQL script to create and 
populate 5 tables, using the AutoCAD information of point, line, 
polyline, text, circle, insert.

Sourceforge project page:
http://sourceforge.net/projects/dxf2postgis

Direct download (Windows installer):
http://www.glasic.it/download/open-source/dxf2postgis-setup-for-windows/download.html

Regards,

    Guglielmo Nigri
    Glasic S.r.l.

Brent Wood wrote:
> --- Eduardo Patto Kanegae <[email protected]> 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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>
>

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