Hello<br><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> cs2cs +init=/usr/local/share/proj/world:gk4-d +towgs84<br>
the result is<br>
56d30'44.77"E 39d38'19.023"N 0.000<br></blockquote><div><br></div><div>This use of cs2cs is not correct. You must run something like:</div><div><br></div><div>cs2cs <i>string_for_system_1</i> +to<i> string_for_system2</i></div>
<div><br></div><div>The +towgs84=... is the part of a string that you use to give datum parameters of that system</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
That's far away. Another online example names:<br>
cs2cs +init=epsg:31466 +to +init=epsg:4326<br>
<br>
which returns even worse:<br>
32d6'20.91"E 46d39'54.638"N 16.676<br></blockquote><div><br></div><div>The EPSG code 31466 is for GK zone 2. Your X coordinate is very large, so it is more likely that the point is in a different zone, probably 4, which has a false easting of 4500 km. In that case you get:</div>
<div><br></div><div>echo 4491957.175 5511210.407 | cs2cs +init=epsg:31468 +to +init=epsg:4326</div><div>11d53'13.028"E 49d44'14.871"N 48.659 </div><div><br></div><div>At least this point is in Germany... The datum transformation parameters used are the following:</div>
<div>+towgs84=598.1,73.7,418.2,0.202,0.045,-2.455,6.7</div><div><br></div><div><br></div><div>Regards</div><div><br></div><div>José Gonçalves</div><div><br></div></div>