[Proj] Problem overlaying georeferenced images in Google Maps(projection problem!)

Eric Miller EMiller at dfg.ca.gov
Thu May 29 11:57:57 EDT 2008

>>> On 5/29/2008 at 8:13 AM, Jorge <jorge.arevalo at gmail.com> wrote:
> gdalwarp
>     -s_srs "+proj=utm +zone=31 +ellps=intl +units=m +no_defs"
>     -t_srs "+proj=merc +lat_ts=0.0 +lon_0=0.0 +k=1.0 +x_0=0.0 +y_0=0.0 
> +a=6378137.0 +b=6378137.0 +units=m +nadgrids=@null +no_defs"
>     <raster file name> <reprojected raster file name>
> Then, I did the reprojection, but I still have the problem... better 
> look, but still remains... Bad overlaid images
> I think that the proj.4 parameters are correct. ...

It looks like you are missing the datum transformation parameters to convert from ED50 to WGS84.  You need to add the +towgs84 parameter to your source projection.  However, I can't help you with suggested values for that parameter for your source coordinate system.  You'll have to do some research.

Eric G. Miller
Staff Programmer
CA Dept. of Fish & Game

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