[Proj] ED50 Spain Portugal to WSG 84

Jose Gonçalves jagoncal at gmail.com
Fri Mar 20 10:24:05 EST 2009

Assuming that the ED50 data are in UTM projection, you can use:

   cs2cs +proj=utm +ellps=intl +zone=30 +towgs84=-84,-107,-120 +to
+proj=latlong +datum=WGS84

Depending on the longitude the zone can also be 31 or 29 (Portugal is all
29). The datum shift parameters (+towgs84) introduce errors of a few meters.


José Gonçalves

2009/3/20 Marc Marí Dell'Olmo <marceivissa at gmail.com>

> Dear all,
> Can anyone tell me how to convert coordinates ED50 Spain/Portugal (not
> only ED50) to  WSG84 (google maps coordinates). I'm new in these
> issues.
> Can anyone tell me the instructions +proj, +k, +ellps, etc. that I
> have to use for conversion?
> Thank you,
> Marc
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