[Qgis-user] vector shp from NAD83 (CSRS98) to UTM WGS84

[Nicolas Cadieux]

Hi, 
It is my understanding that the parameters used in QGIS for that transformation are not sufficient  and will simply lead to a change in EPGS code number with no actual changes to the coordinates. 
If you are dealing with data in the 20k to 250k (like topo maps, SRTM), you can go ahead with that. Difference between both projection are basically due to continental drift and the addition of the third dimension. 
For anything submeter (Lidar, high precision GPS) I recommend using a more precise software.  I know that nrcan has good free tools for changing projection but I don't know if they handle anything else then points (TRX) I think.  Look at the links below for more information if needed.  File is included in attachment. 
Nicolas 
http://www.nrcan.gc.ca/earth-sciences/geomatics/geodetic-reference-systems/tools-applications/10925 
https://www.google.ca/url?sa=t&source=web&rct=j&url=http://www.naref.org/transf/nad83_geomatica2006.pdf&q=csrs98%20nad83&ved=0ahUKEwiex4GHiOvLAhUEdx4KHb0NAwcQFggpMAU&usg=AFQjCNHa-HRpS8Hcc1j74dAysyxgobNY1w&sig2=RRPnudp1rMyhmKYd7vbdoA 
On Mar 31, 2016 8:20 AM, "Joris Hintjens [via OSGeo.org]	" <ml-node+s1560n5258986h27 at n6.nabble.com> wrote: 

	simply save the layer as a new one. “save as”. you will be asked to enter the new CRS. joris Op 30 mrt. 2016, om 06:06 heeft Azzurra Lentini < [hidden email] > het volgende geschreven: Hallo to all, do you know how I can transform vectorial data from NAD83 (CSRS98) to UTM wgs84? do you think if I do with reproject it would be ok?? or what u suggest?? thanks a lot  -- Dr. Hydrogeologist AZZURRA LENTINI Expert of evaluation environmental hazards GIS application Haity Mobile Tel: 0050946057393 ++++++++++++++++++++++++++ Italy Mobile Tel.: **(39) 338 24 40 676 ++++++++++++++++++++++++++ SKYPE azzurrahydro ++++++++++++++++++++++++++ [hidden email] ++++++++++++++++++++++++++ *Par respect pour l'environnement,* *n'imprimez ce mail qu'en cas d'absolue nécessité*   

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nad83_geomatica2006.pdf (6M) <http://osgeo-org.1560.x6.nabble.com/attachment/5259001/0/nad83_geomatica2006.pdf>




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