Hi,
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...
Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
www.archeotec.ca
On Nov 12, 2015 13:01, "francesco_lucca [via OSGeo.org] "
<ml-node+s1560n5236051...@n6.nabble.com> wrote:
Hi,
I have a point in WGS84 UTM32 coordinate
E 589747.816
N 4871699.496
I saved in EPSG 3003 with the following coordinates:
E 1589776.553
N 4871716.117
A colleague made the same conversion using free software "traspunto" (
http://www.mondogis.com/traspunto.html ) developed by the Italian Enviromental
Ministry. He got this result (EPSG 3003 coordinates):
E 1589776.054
N 4871716.382
I try another online tool (
http://www.sardegnageoportale.it/webgis/raswebconverter/index?stato_quale=punto
) and I found these EPSG3003 coordinates:
E 1589776.554
N 4871716.119
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?
Thanks
Francesco
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