<div>The problem is that your first coordinate system does not have a datum information. Use for instance:</div>
<div> </div>
<div>cs2cs -f "%.4f" +ellps=WGS84 +proj=geocent +towgs84=0,0,0 +to ......</div>
<div> </div>
<div>or </div>
<div> </div>
<div>cs2cs -f "%.4f" +datum=WGS84 +proj=geocent +to ......<br><br></div>
<div>Regards</div>
<div> </div>
<div>Jose' Gonçalves</div>
<div> </div>
<div> </div>
<div> </div>
<div class="gmail_quote">2009/1/30 <span dir="ltr"><<a href="mailto:vanzach@survey.ntua.gr">vanzach@survey.ntua.gr</a>></span><br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><br>Hi all.<br><br>I'm trying to convert 3 points from WGS84 to local datum and I noticed that<br>during the datum change phase the coordinates are the same.<br>
<br>$ cs2cs -f "%.4f" +ellps=WGS84 +proj=geocent +to +towgs84=-199.0,74.0,246.0<br>+ellps=GRS80 +proj=geocent < WGS84_XYZ.txt ; more WGS84_XYZ.txt<br>4587235.7556 1964114.8816 3959354.7313<br>4584814.5890 1951028.4660 3968408.6021<br>
4589128.8900 1935365.8050 3971034.4841<br>4587235.7556 1964114.8816 3959354.7312<br>4584814.589 1951028.466 3968408.602<br>4589128.890 1935365.805 3971034.484<br><br>Any ideas?<br>Thanks in advance,<br>
Vangelis<br><br>_______________________________________________<br>Proj mailing list<br><a href="mailto:Proj@lists.maptools.org">Proj@lists.maptools.org</a><br><a href="http://lists.maptools.org/mailman/listinfo/proj" target="_blank">http://lists.maptools.org/mailman/listinfo/proj</a><br>
</blockquote></div><br>