[gdal-dev] Buffering geometries

[Federico Jurio]

Thank you for your advice Even, it works perfectly!
i have another issue, what is the unit of dfDist from
Buffer<http://www.gdal.org/ogr/classOGRGeometry.html#ab34b27e2c8812a0fc1dccf055b11d1a2>
?


On Tue, Oct 1, 2013 at 4:02 PM, Even Rouault
<even.rouault at mines-paris.org>wrote:

> Le lundi 30 septembre 2013 23:12:30, federico a écrit :
> > Dear all, i'm trying buffer some geometries with GDAL. I have success
> with
> > poligons and lines but i can't create the buffer when i try to do the
> same
> > procedure with an OGRPoint.
> >
> > Here is a screenshot with the buffer http://i.imgur.com/rRQuooc.jpg
> >
> > I'm using the Buffer function from OGRGeometry Class in a map with WGS 84
> > coordinates reference system.
> >
> > Anyone know what could be wrong?
>
> This should work. Make sure your target layer can contain polygons. Your
> code
> sample isn't sufficient to detect what might go wrong in your case.
>
> Just a few remarks : you are going to suffer from 3 memory leaks in your
> code
> sample (if it isn't an extract of your real code) :
> * Buffer() returns a new geometry object. So use SetGeometryDirectly() so
> that
> it is owned by pnewfeature
> * you should delete pnewfeature after having passed it to CreateFeature()
> * you should delete pfeature when it is no longer used
>
> >
> > Code example
> >
> >    OGRFeature *pfeature = player->GetNextFeature(); // Apunta al primer
> > feature
> >    while (pfeature) {
> >       OGRFeature* pnewfeature = pfeature->Clone();
> >
> >
> pnewfeature->SetGeometry(pnewfeature->GetGeometryRef()->Buffer(bufferdist))
> > ; pdestlayer->CreateFeature(pnewfeature);
> >       pfeature = player->GetNextFeature();
> >    }
> >
> >
> >
> > --
> > View this message in context:
> > http://osgeo-org.1560.x6.nabble.com/Buffering-geometries-tp5081031.html
> > Sent from the GDAL - Dev mailing list archive at Nabble.com.
> > _______________________________________________
> > gdal-dev mailing list
> > gdal-dev at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
> --
> Geospatial professional services
> http://even.rouault.free.fr/services.html
>



-- 
Federico Jurio
SUR Emprendimientos Tecnológicos

Perú 345  Piso 5to Oficina "B" (C1067AAG)
Ciudad de Buenos Aires, Argentina
Tel. +54 (11) 4342-2976/84
federicojurio at suremptec.com.ar
www.suremptec.com
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