<p dir="ltr">Hi,</p>
<p dir="ltr">That all depends, I guess on what version of WGS 84 datum the software uses to calculate the conversion. Most softwares don't even make a difference between wgs 84 and NAD 83. I would look at the conversion parameters carefully. Generally speaking, I would go with the governmental product as they must have a better control over stuff like GPS time and Continental drift... </p>
<p dir="ltr">Nicolas Cadieux M.Sc.<br>
Les Entreprises Archéotec inc. <br>
8548, rue Saint-Denis Montréal H2P 2H2<br>
Téléphone: 514.381.5112 Fax: 514.381.4995<br>
www.archeotec.ca</p>
<div class="gmail_quote">On Nov 12, 2015 13:01, "francesco_lucca [via OSGeo.org] " <<a href="/user/SendEmail.jtp?type=node&node=5236126&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>> wrote:<br type='attribution'><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,
<br />I have a point in WGS84 UTM32 coordinate
<br /><br />E 589747.816
<br />N 4871699.496
<br /><br />I saved in EPSG 3003 with the following coordinates:
<br /><br />E 1589776.553
<br />N 4871716.117
<br /><br />A colleague made the same conversion using free software "traspunto" (<a href="http://www.mondogis.com/traspunto.html" target="_top" rel="nofollow" link="external">http://www.mondogis.com/traspunto.html</a>) developed by the Italian Enviromental Ministry. He got this result (EPSG 3003 coordinates):
<br /><br />E 1589776.054
<br />N 4871716.382
<br /><br />I try another online tool (<a href="http://www.sardegnageoportale.it/webgis/raswebconverter/index?stato_quale=punto" target="_top" rel="nofollow" link="external">http://www.sardegnageoportale.it/webgis/raswebconverter/index?stato_quale=punto</a>) and I found these EPSG3003 coordinates:
<br /><br />E 1589776.554
<br />N 4871716.119
<br /><br />Summary: QGIS and sardegnageoportale seem to give the same results, traspunto is different (0.50 meter difference). Which is the correct result? Where can I found the calculation for the conversion from a system to another?
<br /><br />Thanks
<br /><br />Francesco
<br />
<br />
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