Hi Marc,
Maybe You should try to use QGIS software. Is a free and open-source
software and is very simple to transform shapefile from a reference system
to another also in different format. QGIS is also very powerful with
spatial transformation and uses GDAL like R
Anyway I will try for you with Barcelona data.


> Message: 2
> Date: Tue, 3 Dec 2013 11:56:07 +0100
> From: Marc Mar? Dell'Olmo <marceivissa@gmail.com <javascript:;>>
> To: R-sig-geo mailing list <r-sig-geo@r-project.org <javascript:;>>
> Subject: [R-sig-Geo] Problem converting shp ED50 to WGS84 with
>         spTransform     and writeOGR
> Message-ID:
>         <
> CAAZSCQ7ZxOEHfZeqjYt1b3bWthbj5dUyU5ahrZte-jFu1jeUWw@mail.gmail.com<javascript:;>
> >
> Content-Type: text/plain
>
> Dear all,
>
> I'm trying to convert a map of Barcelona (in shp format) with reference
> ED50 to a kml with Google Maps reference. I have used the following syntax,
> but it creates a slightly displaced map (maybe just a few meters) and do
> not understand why!
>
>
> setwd("C:/dir")
> barcelona <- readOGR("C:/dir", "Dist_postals_BCN")
> proj4string(barcelona) <- CRS("+proj=utm +zone=31 +ellps=intl +units=m
> +no_defs")
> # Or proj4string(barcelona) <- CRS("+init=epsg:23031")
> x1 <- spTransform(barcelona, CRS("+proj=longlat +datum=WGS84 +no_defs"))
> writeOGR(x1, "districtes.kml", "x1" ,  driver="KML")
>
>
> If you want to try, you can download the ED50 shp map here:
> https://dl.dropboxusercontent.com/u/14934021/map.zip
>
> And here de displaced kml:
> https://dl.dropboxusercontent.com/u/14934021/districtes.kml
>
> Thank you!!
>
> Marc
>
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-- 
Maurizio Marchi
ID skype: maurizioxyz
*Ubuntu 12.04 (Precise Pangolin)*
*"Il bello dell'open-source è che le domande possono essere poste alla
fonte"*
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